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ADU Rules in Oakland, California

Complete guide to building an Accessory Dwelling Unit in Oakland — zoning, setbacks, permits, costs, and more.

Max Size: 850 sq ft for a studio or one-bedroom unit; 1,000 sq ft for two or more bedrooms, measured as total floor area including all areas within the ADU (Table 17.103.01, Category 2; 7/21/2026 Zoning Criteria Checklist). A Category 1 conversion of an existing detached garage or shed has no size cap other than the existing building envelope plus up to 150 sq ft for an entrance; if enlarged by more than 150 sq ft the whole unit is capped at 850/1,000 sq ft and the addition must meet setbacks (Table notes 3 and 4) Setbacks: 4 ft from the rear lot line, or the zone's regularly required rear setback if that is smaller, but never less than 3 ft (Table 17.103.01, Category 2). Category 1 conversions and JADUs inside an existing building have no ADU setback, even if the building is nonconforming (note 6). Lot coverage, rear-setback coverage and FAR limits cannot be used to block one JADU plus one ADU of up to 850 sq ft and 18 ft with 4-ft side and rear setbacks Parking: Varies Verified: 2026-09-19

Researched by ADU Zoning Hub · verified 2026-09-19 against Oakland planning code and California ADU law · methodology · 24 sources cited ↓

ADU Score: 8/10
Very ADU-friendly · how we score

Are ADUs allowed in Oakland, CA? [1][2][3][4][5]

Yes. Oakland allows ADUs on most residential lots. A detached unit can be up to 850 sq ft, set 4 ft back from the rear line. Parking varies by lot and unit size. Owner-occupancy is not required, so the unit can be rented out. A building permit is required and applications are reviewed administratively, without a public hearing.

Maximum size850 sq ft for a studio or one-bedroom unit; 1,000 sq ft for two or more bedrooms, measured as total floor area including all areas within the ADU (Table 17.103.01, Category 2; 7/21/2026 Zoning Criteria Checklist). A Category 1 conversion of an existing detached garage or shed has no size cap other than the existing building envelope plus up to 150 sq ft for an entrance; if enlarged by more than 150 sq ft the whole unit is capped at 850/1,000 sq ft and the addition must meet setbacks (Table notes 3 and 4)
SetbacksRear 4 ft from the rear lot line, or the zone's regularly required rear setback if that is smaller, but never less than 3 ft (Table 17.103.01, Category 2). Category 1 conversions and JADUs inside an existing building have no ADU setback, even if the building is nonconforming (note 6). Lot coverage, rear-setback coverage and FAR limits cannot be used to block one JADU plus one ADU of up to 850 sq ft and 18 ft with 4-ft side and rear setbacks · Side 4 ft from each side lot line, or the zone's required side setback if smaller, but never less than 3 ft (Table 17.103.01). The City's 7/21/2026 checklist also requires a detached Category 2 ADU to sit at least 6 ft from every other dwelling unit on the lot unless that would preclude a minimum-size ADU, and bars water heaters, condensers and similar equipment from the required side setback except as allowed by OMC 17.108.130(I)
ParkingNone required if the lot is in the City's mapped No Parking for ADUs area: within 1/2-mile walking distance of a public transit stop, in an Area of Primary or Secondary Importance (API/ASI), where residential parking permits are required but not offered to ADU occupants, or within one block of a car-share vehicle; and none for any ADU created inside the existing or proposed house or an accessory structure (Table 17.103.01). Otherwise one space per ADU, which may be tandem (OMC 17.116.240). JADUs need no parking. No replacement parking is required when a covered or uncovered space is removed to build the ADU (OMC 17.103.080(A)(4)). In the S-9 zone a new-construction ADU is allowed only if you add one off-street space beyond what the house requires and replace any lost spaces (OMC 17.88.050(B)(1))
Owner-occupancyNot required for any ADU on single-family or multifamily lots (Tables 17.103.01 and 17.103.02). For a JADU, the City's 7/21/2026 checklist requires the owner to live in the JADU or the main house only when the JADU shares a bathroom with the house (Gov. Code 66333(b) as amended by AB 1154, effective January 1, 2026); a JADU with its own bathroom, or one owned by a government agency, land trust or housing organization, is exempt. Every JADU needs a notarized deed restriction, recorded before the building permit issues, barring separate sale and restricting size

Do I need a permit to build an ADU in Oakland? [6][7][8][9][10][11][12][13][14]

Yes. Every ADU in Oakland needs a building permit. Applications are handled administratively — no public hearing.

Permit feesZoning: ADU Design Review Exemption (Categories I, II and III) $878.58 base, $1,061.45 total with the 7.2% General Plan Update and 12.70% Technology/Records surcharges; ADU Amnesty Program $1,765.74 total (Zoning Fee Schedule FY2026-27, loaded September 4, 2026). Permit application intake $134.32 online or $201.49 at the counter. Building permit (Master Fee Schedule effective July 1, 2026, R-3): new construction plan review $10.60 plus inspection $8.00 per $1,000 of construction value, each with a $335.81 minimum; alterations and additions $17.08 plus $26.11 per $1,000; electrical, plumbing and mechanical inspections $7.66, $4.79 and $4.36 per $1,000 of each trade's value; plus a 7.20% General Plan surcharge and a 12.70% Records Management and Technology fee on building fees; zoning inspection $537.28 on a new-construction residential permit. Our arithmetic for a $300,000 new detached ADU: about $6,700 in building plan-check and inspection fees plus $1,061.45 zoning, before trade permits. The City's own rule of thumb is 4-6% of project value. Separate: new sewer lateral connection permit $1,798.93 (Public Works schedule, expressly including ADUs) and the OUSD school fee of $5.17 per sq ft
Typical timelineState law: the City must approve or deny a complete ADU application within 60 days or it is deemed approved (Gov. Code 66317 as amended by SB 543, effective January 1, 2026). Oakland's published targets, in business days for complete applications: zoning review for ADUs 10 to 20 days; building plan check 21 days for a new ADU, or 10 days for an ADU using City pre-approved plans only; building final check 7 days to 3 weeks (3 days to 1.5 weeks with expedited overtime review). Requesting expedited overtime plan review cuts the building estimates by about 50%
Official Oakland links:

Three things to know before you build in Oakland

  • Design to the protected envelope: one ADU of up to 850 sq ft and 18 ft with 4-ft side and rear setbacks cannot be blocked by lot coverage, FAR, rear-yard coverage or the front setback
  • Check the S-9 Fire Safety zone layer on the City zoning map before you design: inside it, only one interior-conversion ADU or JADU is allowed unless you add an off-street parking space or get a Reasonable Accommodation approved
  • Check the No Parking for ADUs layer too; a conversion never needs a parking space, and no replacement parking is owed for a garage you convert

Last verified 2026-09-19 against Oakland planning code. How we verify

Oakland approves ADUs ministerially under Oakland Planning Code Section 17.103.080 (Title 17 as republished effective July 21, 2026) on any lot zoned for permanent residential use that has an existing or proposed home. A new detached ADU may be 850 sq ft (studio or one bedroom) or 1,000 sq ft (two or more bedrooms) and 20 ft tall with 4-ft side and rear setbacks; an attached ADU may instead be 50% of the main house up to 1,200 sq ft, and a JADU is capped at 500 sq ft. A single-family lot can hold one conversion ADU, one new-construction ADU and one JADU, but inside the S-9 Fire Safety Protection zone only one interior-conversion ADU or JADU is allowed unless you add an off-street parking space or obtain a reasonable accommodation. The process is a zoning Design Review Exemption ($1,061.45 in FY2026-27) followed by a building permit priced per $1,000 of construction value, with no City impact fees at any size, published turnaround targets of 10-20 business days for zoning and 21 days for building plan check (10 with one of the City's three free pre-approved plans), and the state's 60-day deemed-approval clock.

Zoning & Size Requirements [1][2][3][4][5]

Yes — Oakland allows ADUs. A detached ADU can typically be up to 850 sq ft under current California and Oakland zoning rules.

See what this means for your lot — ask Oakland ADU builders for a quote →

Allowed ZonesAny lot in a zoning district that permits Permanent Residential Activities, in conjunction with an existing or proposed primary residence (OMC 17.103.080(A)(6)). That covers every residential zone (RH Hillside, RD Detached Unit, RM Mixed Housing Type, RU Urban), the HBX housing-business mix zones, the CN, CC and CR commercial zones, S-15 transit-oriented zones and most D- district zones; industrial (M-40, CIX, IG, IO), S-1, S-3 and OS open space zones do not permit permanent residential use. The S-9 Fire Safety Protection Combining Zone can overlay any zone and limits ADUs regardless of the base zone (OMC 17.88.050). Confirm your zone and the S-9 and No-Parking-for-ADUs layers on the City's online zoning map
Max Size (Detached)850 sq ft for a studio or one-bedroom unit; 1,000 sq ft for two or more bedrooms, measured as total floor area including all areas within the ADU (Table 17.103.01, Category 2; 7/21/2026 Zoning Criteria Checklist). A Category 1 conversion of an existing detached garage or shed has no size cap other than the existing building envelope plus up to 150 sq ft for an entrance; if enlarged by more than 150 sq ft the whole unit is capped at 850/1,000 sq ft and the addition must meet setbacks (Table notes 3 and 4)
Max Size (Attached)Whichever is greater: (a) 850 sq ft for a studio or one bedroom and 1,000 sq ft for two or more bedrooms, or (b) 50% of the floor area of the primary residence, not to exceed 1,200 sq ft (Table 17.103.01, Category 2 attached). A Category 1 conversion inside the existing house is limited only by the existing envelope plus a 150 sq ft entrance addition; a 2,400 sq ft house therefore supports a 1,200 sq ft attached ADU, while a 1,500 sq ft house gets 850/1,000 sq ft
Max Size (JADU)500 sq ft, entirely within the walls of an existing or proposed single-family home (an attached garage counts; a detached garage or shed cannot become a JADU). A JADU needs an efficiency kitchen and a separate exterior entrance; it may share a bathroom with the house if there is an internal connection (OMC 17.09.040 and Table 17.103.01)
Max Height20 ft for a new Category 2 ADU that uses the reduced 4-ft side and rear setbacks. If the ADU meets the underlying zone's full setbacks, the zone's own height limit applies and may exceed 20 ft, but never less than 16 ft (Table 17.103.01). A Category 1 conversion keeps whatever height the zone allows, and a 150 sq ft entrance addition is limited to 18 ft unless the zone permits more (note 5). On two-to-four-family and multifamily lots a detached Category 2 ADU is limited to 18 ft plus 2 ft to match the main building's roof pitch (Table 17.103.02)
Max UnitsSingle-family lot: one Category 1 ADU (conversion of the house or an existing accessory structure), one Category 2 ADU (new attached or detached construction) and one JADU, in any order, up to three units (Table 17.103.01 note 1). Existing two-to-four-family or multifamily lot: Category 1 conversions of non-livable space (storage, attics, basements, garages) equal to at least 1 and up to 25% of existing units, plus up to 8 detached Category 2 ADUs, but the ADUs may not outnumber the units in the main building; a proposed multifamily building gets 2 detached ADUs; a Category 3 attached ADU is limited to one and precludes any other ADU on the lot (Table 17.103.02). S-9 Fire Safety zone: one ADU or JADU per lot, and it must be an interior conversion within the existing building, unless you add an off-street parking space or hold an approved Reasonable Accommodation under OMC 17.131 (OMC 17.88.050)

Setback Requirements [1][2][3][4][5]

Oakland requires a rear setback of about 4 ft for a detached ADU, and parking requirements vary by unit size or location. Owner-occupancy is not required — you can rent it out without living on the property.

Rear Setback4 ft from the rear lot line, or the zone's regularly required rear setback if that is smaller, but never less than 3 ft (Table 17.103.01, Category 2). Category 1 conversions and JADUs inside an existing building have no ADU setback, even if the building is nonconforming (note 6). Lot coverage, rear-setback coverage and FAR limits cannot be used to block one JADU plus one ADU of up to 850 sq ft and 18 ft with 4-ft side and rear setbacks
Side Setback4 ft from each side lot line, or the zone's required side setback if smaller, but never less than 3 ft (Table 17.103.01). The City's 7/21/2026 checklist also requires a detached Category 2 ADU to sit at least 6 ft from every other dwelling unit on the lot unless that would preclude a minimum-size ADU, and bars water heaters, condensers and similar equipment from the required side setback except as allowed by OMC 17.108.130(I)
Front SetbackThe underlying zone's front setback applies, except where lot conditions would prevent building one ADU of up to 850 sq ft and 18 ft anywhere else on the lot (Table 17.103.01). On a property listed in the California Register of Historic Resources an ADU may go in front of the main building only if no minimum-size ADU fits elsewhere, and placement preference runs rear, then side, then front (OMC 17.103.080(A)(12)); those historic rules do not apply to ADUs built under Gov. Code 66323
Parking RequiredNone required if the lot is in the City's mapped No Parking for ADUs area: within 1/2-mile walking distance of a public transit stop, in an Area of Primary or Secondary Importance (API/ASI), where residential parking permits are required but not offered to ADU occupants, or within one block of a car-share vehicle; and none for any ADU created inside the existing or proposed house or an accessory structure (Table 17.103.01). Otherwise one space per ADU, which may be tandem (OMC 17.116.240). JADUs need no parking. No replacement parking is required when a covered or uncovered space is removed to build the ADU (OMC 17.103.080(A)(4)). In the S-9 zone a new-construction ADU is allowed only if you add one off-street space beyond what the house requires and replace any lost spaces (OMC 17.88.050(B)(1))
Owner OccupancyNot required for any ADU on single-family or multifamily lots (Tables 17.103.01 and 17.103.02). For a JADU, the City's 7/21/2026 checklist requires the owner to live in the JADU or the main house only when the JADU shares a bathroom with the house (Gov. Code 66333(b) as amended by AB 1154, effective January 1, 2026); a JADU with its own bathroom, or one owned by a government agency, land trust or housing organization, is exempt. Every JADU needs a notarized deed restriction, recorded before the building permit issues, barring separate sale and restricting size
Min Lot SizeNo minimum lot size (OMC 17.103.080 and Tables 17.103.01/.02 contain none). The code protects one JADU plus one ADU of up to 850 sq ft and 18 ft with 4-ft side and rear setbacks from lot coverage, rear-setback coverage and FAR limits, and requires no new open space for an ADU

Permit Process & Fees [6][7][8][9][10][11][12][13][14]

An ADU permit in Oakland goes through a ministerial, by-right review. Typical timeline: State law: the City must approve or deny a complete ADU application within 60 days or it is deemed approved (Gov. Code 66317 as amended by SB 543, effective January 1, 2026). Oakland's published targets, in business days for complete applications: zoning review for ADUs 10 to 20 days; building plan check 21 days for a new ADU, or 10 days for an ADU using City pre-approved plans only; building final check 7 days to 3 weeks (3 days to 1.5 weeks with expedited overtime review). Requesting expedited overtime plan review cuts the building estimates by about 50%. Permit fees: Zoning: ADU Design Review Exemption (Categories I, II and III) $878.58 base, $1,061.45 total with the 7.2% General Plan Update and 12.70% Technology/Records surcharges; ADU Amnesty Program $1,765.74 total (Zoning Fee Schedule FY2026-27, loaded September 4, 2026). Permit application intake $134.32 online or $201.49 at the counter. Building permit (Master Fee Schedule effective July 1, 2026, R-3): new construction plan review $10.60 plus inspection $8.00 per $1,000 of construction value, each with a $335.81 minimum; alterations and additions $17.08 plus $26.11 per $1,000; electrical, plumbing and mechanical inspections $7.66, $4.79 and $4.36 per $1,000 of each trade's value; plus a 7.20% General Plan surcharge and a 12.70% Records Management and Technology fee on building fees; zoning inspection $537.28 on a new-construction residential permit. Our arithmetic for a $300,000 new detached ADU: about $6,700 in building plan-check and inspection fees plus $1,061.45 zoning, before trade permits. The City's own rule of thumb is 4-6% of project value. Separate: new sewer lateral connection permit $1,798.93 (Public Works schedule, expressly including ADUs) and the OUSD school fee of $5.17 per sq ft.

Approval ProcessMinisterial when the plans comply with OMC 17.103.080 and Chapter 17.88 (17.103.080(A)(1)); no hearing or notice. Two applications through the City's Online Permit Center (Accela): 1) a Zoning Worksheet for the ADU Design Review Exemption, uploading the Zoning Criteria Checklist (7/21/2026 version), plans per the Zoning Plan Requirements and, if an agent applies, the Owner and Applicant Authorization Form; 2) after written zoning approval, a building permit application with the Building Criteria Checklist, Title 24 energy forms and structural calculations, followed by a Green Halo recycling plan (WRRP), a sewer lateral permit from OakDOT for a detached unit, an EBMUD private sewer lateral certificate if valuation exceeds $100,000, and PG&E service requests. Extra items apply on California Register properties and in the S-9 zone; a Creek Protection permit or tree permit is needed near creeks or protected trees. A Certificate of Occupancy is mailed after final inspection. Renting the unit requires a City business license and a term over 30 days
Review TimelineState law: the City must approve or deny a complete ADU application within 60 days or it is deemed approved (Gov. Code 66317 as amended by SB 543, effective January 1, 2026). Oakland's published targets, in business days for complete applications: zoning review for ADUs 10 to 20 days; building plan check 21 days for a new ADU, or 10 days for an ADU using City pre-approved plans only; building final check 7 days to 3 weeks (3 days to 1.5 weeks with expedited overtime review). Requesting expedited overtime plan review cuts the building estimates by about 50%
Permit FeesZoning: ADU Design Review Exemption (Categories I, II and III) $878.58 base, $1,061.45 total with the 7.2% General Plan Update and 12.70% Technology/Records surcharges; ADU Amnesty Program $1,765.74 total (Zoning Fee Schedule FY2026-27, loaded September 4, 2026). Permit application intake $134.32 online or $201.49 at the counter. Building permit (Master Fee Schedule effective July 1, 2026, R-3): new construction plan review $10.60 plus inspection $8.00 per $1,000 of construction value, each with a $335.81 minimum; alterations and additions $17.08 plus $26.11 per $1,000; electrical, plumbing and mechanical inspections $7.66, $4.79 and $4.36 per $1,000 of each trade's value; plus a 7.20% General Plan surcharge and a 12.70% Records Management and Technology fee on building fees; zoning inspection $537.28 on a new-construction residential permit. Our arithmetic for a $300,000 new detached ADU: about $6,700 in building plan-check and inspection fees plus $1,061.45 zoning, before trade permits. The City's own rule of thumb is 4-6% of project value. Separate: new sewer lateral connection permit $1,798.93 (Public Works schedule, expressly including ADUs) and the OUSD school fee of $5.17 per sq ft
Impact FeesNone. Oakland exempts Accessory Dwelling Units by project type from its Affordable Housing Impact Fee (OMC 15.72.040(C)(1)) and from the Transportation and Capital Improvements Impact Fees (OMC 15.74.040(C)(3)), with no square-footage threshold; the exemption was carried into the impact-fee amendments the City Council adopted July 15, 2025 (rates effective September 13, 2025). For comparison, a new single-family house pays $4.40-$12.66 per sq ft for affordable housing, $0.74-$2.94 per sq ft for capital improvements and $0.74 per sq ft for transportation depending on fee zone. Not covered by the exemption: the OUSD school facilities fee ($5.17 per sq ft residential, collected by the City for the district; confirm ADU applicability with OUSD Facilities, 510-879-2700), EBMUD water meter and capacity charges, and the City sewer lateral permit. Under Gov. Code 66311.7 (the AB 2533 amnesty, formerly 66332) an unpermitted ADU built before January 1, 2020 that is being legalized owes no impact fees or connection charges
Plan CheckElectronic plan check through the Online Permit Center; pay the intake fee, upload plans, and a permit number is issued once the application is complete. Building checklist items (2/2025): 7 ft 6 in ceilings, a 150 sq ft minimum combined living room, separate heating and water heater for the ADU, exterior walls fire-rated by separation distance with no openings within 5 ft of a property line (3 ft if sprinklered), sprinklers only if the main house must be sprinklered or the combined floor area passes 3,600 sq ft through an addition, STC 45-50 sound rating for attached units, and a 1,000 gpm hydrant test only for a new or substantially rehabilitated main house. Removing more than 50% of an existing building makes it new construction, not a conversion
Pre-Approved PlansYes. The City publishes three free permit-ready detached plan sets, drawn to the 2022 California codes: a 435 sq ft studio, a 625 sq ft one-bedroom and a 746 sq ft two-bedroom, usable on single-family and multifamily lots. Using one unaltered moves building plan check from the 21-day track to the 10-day Engineer-of-the-Day track, and the building permit issues within 10 business days once fees are paid and plans are cleared; you still file the zoning application, a site plan and a signed hold-harmless agreement, and the Planning Bureau confirms the plan fits your lot (some neighborhoods and districts are excluded). The City advertises reduced permit fees for these plans but the FY2026-27 fee schedules list no separate ADU rate. Oakland also accepts architect- and designer-submitted plans for pre-approval under AB 1332

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Construction Costs [15][16][17]

Building an ADU in Oakland typically costs $210,000-$400,000 ($250-$500 per sq ft); a garage conversion runs $120,000-$220,000.

See what this means for your lot — ask Oakland ADU builders for a quote →

Average Build Cost$210,000-$400,000
Cost per Sq Ft$250-$500
Garage Conversion$120,000-$220,000
Prefab ADU (Installed)$150,000-$300,000

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Rental Income Potential [18][19][20][21]

A 2-bedroom ADU in Oakland rents for around $2,700-$3,300/mo, an estimated 7-9% gross rental yield on a $250,000-$350,000 new detached unit at $2,100-$2,500/mo for one bedroom (estimate before taxes, vacancy and financing).

Avg Rent (1 Bedroom)$2,100-$2,500/mo
Avg Rent (2 Bedroom)$2,700-$3,300/mo
Short-Term RentalNo.
Est. Annual ROI7-9% gross rental yield on a $250,000-$350,000 new detached unit at $2,100-$2,500/mo for one bedroom (estimate before taxes, vacancy and financing)

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Recent Law Changes

What's Changed Recently

  • FY2026-27 fee schedules (Master Fee Schedule effective July 1, 2026; Zoning Fee Schedule loaded September 4, 2026): the ADU Design Review Exemption rose to $878.58 base / $1,061.45 total (from $491.62 / $593.95 in FY2025-26), the Amnesty Program fee to $1,765.74, online permit intake to $134.32, and the new sewer lateral connection permit is $1,798.93
  • Planning Code Title 17 republished effective July 21, 2026 (Supplement 55); the City reissued its single-family ADU Zoning Criteria Checklist the same day, applying the AB 1154 JADU owner-occupancy test (owner-occupancy only when the JADU shares a bathroom, Gov. Code 66333(b), effective January 1, 2026)
  • 2025 ADU and Fire Zone amendments to OMC 17.103.080 and Chapter 17.88 (Planning Commission case ZA25001, May 7, 2025; City Council file 25-0791, July 15, 2025): up to 8 detached ADUs on existing multifamily lots, no replacement of uncovered parking removed for an ADU, historic design standards no longer applied to Gov. Code 66323 ADUs, and the Very High Fire Hazard Severity Zone redefined to include the City-adopted map
  • Impact fee amendments adopted July 15, 2025 (rates effective September 13, 2025): ADUs remain exempt from all three residential impact fees; fees are now charged per square foot and paid at Certificate of Occupancy
  • SB 543 (effective January 1, 2026): a complete ADU application is deemed approved if the City does not act within 60 days
  • ADU amnesty and AB 2533 legalization (OMC 17.103.080(A)(14); checklist updated August 25, 2025): Planning Code amnesty for units built and occupied before January 1, 2021 with applications accepted until January 1, 2030, and up to 5 years of Building Code enforcement delay for units built before January 1, 2020, outside the S-9 zone

Tips for Building an ADU in Oakland

  • Design to the protected envelope: one ADU of up to 850 sq ft and 18 ft with 4-ft side and rear setbacks cannot be blocked by lot coverage, FAR, rear-yard coverage or the front setback
  • Check the S-9 Fire Safety zone layer on the City zoning map before you design: inside it, only one interior-conversion ADU or JADU is allowed unless you add an off-street parking space or get a Reasonable Accommodation approved
  • Check the No Parking for ADUs layer too; a conversion never needs a parking space, and no replacement parking is owed for a garage you convert
  • The three free pre-approved plans (435, 625 and 746 sq ft) cut building plan check from 21 to 10 business days and the permit issues within 10 business days of clearance
  • A detached unit needs a $1,798.93 sewer lateral permit, an EBMUD private sewer lateral certificate if the job is over $100,000, and possibly a new PG&E meter; a conversion inside the house avoids most of that
  • There are no City impact fees on an ADU of any size, but budget the OUSD school fee ($5.17 per sq ft) and EBMUD meter charges
  • Built before 2021 without permits? Apply for Planning Code amnesty before January 1, 2030 ($1,765.74 zoning fee); units built before 2020 also owe no impact or connection fees when legalized under AB 2533
  • Cost basis (2026-09-19 re-verification): avg build cost $210,000-$400,000 for a 600-800 sq ft new detached ADU, from the City's own ADU page estimate of $300-$500 per sq ft for new detached construction and Hamilton Exteriors' 2026 Oakland guide ($210,000-$360,000; $250-$400 per sq ft) | cost per sq ft $250-$500 (City estimate $300-$500 new detached, $250-$400 attached; industry $250-$400 Oakland, $300-$550 statewide) | garage conversion $120,000-$220,000 for a 400-500 sq ft two-car garage (City estimate $200-$300 per sq ft inside the home, $300-$650 for an accessory structure; Hamilton $150,000-$200,000) | prefab $150,000-$300,000 installed for about 500 sq ft (City estimate $300-$500 per sq ft modular; ADUscale 2026 $120,000-$250,000 statewide, Bay Area 25-50% higher)
  • Cost basis (2026-09-19 re-verification): short term allowed: No. An ADU or JADU may be rented only for terms longer than 30 consecutive days (OMC 17.103.080(A)(2)), and the City requires a business license to rent it; an ADU cannot be sold separately from the main home except as state law allows (17.103.080(A)(3))

ADU Builders in Oakland

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Sources & References

All data on this page is sourced from official government records and verified market data. View our full methodology.

  1. Oakland Planning Code Title 17, effective July 21, 2026 (OMC 17.103.080, Tables 17.103.01 and 17.103.02, 17.09.040, 17.88.050) | City of Oakland Municipal Code — Accessed 2026-09-19
  2. ADU Zoning Criteria Checklist, One-Family ADU Application (updated 7/21/2026) | City of Oakland Planning Bureau Planning Department — Accessed 2026-09-19
  3. ADU with Single Family Home: requirements and how to apply | City of Oakland Planning Department — Accessed 2026-09-19
  4. Accessory Dwelling Units (ADUs) overview | City of Oakland Planning Department — Accessed 2026-09-19
  5. Planning Commission staff report, case ZA25001: 2025 ADU and Fire Zone Planning Code amendments (May 7, 2025) | City of Oakland Planning Department — Accessed 2026-09-19
  6. Zoning Permit Fees Schedule FY2026-27 (updated in Accela September 4, 2026) | City of Oakland Government Data — Accessed 2026-09-19
  7. FY2026-27 Adopted Master Fee Schedule, effective July 1, 2026 (Planning & Building pp. O-1 to O-9; Public Works sewer laterals p. L-5) | City of Oakland Government Data — Accessed 2026-09-19
  8. Average Permit Processing Turnaround Times | City of Oakland Planning & Building Planning Department — Accessed 2026-09-19
  9. Impact Fees (rates effective September 13, 2025; school fees) | City of Oakland Planning & Building Planning Department — Accessed 2026-09-19
  10. Amendments to OMC Chapter 15.72 Affordable Housing Impact Fees (ADU exemption, 15.72.040(C)(1)) | City of Oakland Municipal Code — Accessed 2026-09-19
  11. Amendments to OMC Chapter 15.74 Transportation and Capital Improvements Impact Fees (ADU exemption, 15.74.040(C)(3)) | City of Oakland Municipal Code — Accessed 2026-09-19
  12. Apply for ADU(s) with Pre-Approved Plans | City of Oakland Planning Department — Accessed 2026-09-19
  13. ADU Building Criteria Checklist, One-Family ADU Application (updated 02/2025) | City of Oakland Planning Department — Accessed 2026-09-19
  14. Legalize Your Unpermitted ADU or Junior ADU (Amnesty and AB 2533 programs) | City of Oakland Planning Department — Accessed 2026-09-19
  15. Accessory Dwelling Units: ADU types and cost per square foot estimates | City of Oakland Government Data — Accessed 2026-09-19
  16. ADU Cost in Oakland (2026 Guide) | Hamilton Exteriors industry — Accessed 2026-09-19
  17. Prefab and detached ADU cost bands, 2026 California data | ADUscale industry — Accessed 2026-09-19
  18. HUD FY2026 Fair Market Rents, Oakland-Fremont, CA HUD Metro FMR Area Government Data — Accessed 2026-09-19
  19. HUD FY2027 Schedule of Metropolitan Fair Market Rents (Oakland-Fremont, CA HMFA), effective October 1, 2026 Government Data — Accessed 2026-09-19
  20. Oakland, CA rent research (median listing rents, September 2026) | Zumper Market Data — Accessed 2026-09-19
  21. Average rent in Oakland, CA (August 2026) | RentCafe Market Data — Accessed 2026-09-19
  22. CA SB 543 (2025-2026), Gov. Code 66317 60-day deemed approval (full bill text) Government Data — Accessed 2026-09-19
  23. Gov. Code 66333(b) JADU owner-occupancy (as amended by AB 1154, Stats. 2025 ch. 507) Government Data — Accessed 2026-09-19
  24. California HCD Accessory Dwelling Unit Handbook Government Data — Accessed 2026-09-19

Frequently Asked Questions

Can I build an ADU in Oakland?

Yes. ADUs are allowed in Any lot in a zoning district that permits Permanent Residential Activities, in conjunction with an existing or proposed primary residence (OMC 17.103.080(A)(6)). That covers every residential zone (RH Hillside, RD Detached Unit, RM Mixed Housing Type, RU Urban), the HBX housing-business mix zones, the CN, CC and CR commercial zones, S-15 transit-oriented zones and most D- district zones; industrial (M-40, CIX, IG, IO), S-1, S-3 and OS open space zones do not permit permanent residential use. The S-9 Fire Safety Protection Combining Zone can overlay any zone and limits ADUs regardless of the base zone (OMC 17.88.050). Confirm your zone and the S-9 and No-Parking-for-ADUs layers on the City's online zoning map in Oakland. The maximum size for a detached ADU is 850 sq ft for a studio or one-bedroom unit; 1,000 sq ft for two or more bedrooms, measured as total floor area including all areas within the ADU (Table 17.103.01, Category 2; 7/21/2026 Zoning Criteria Checklist). A Category 1 conversion of an existing detached garage or shed has no size cap other than the existing building envelope plus up to 150 sq ft for an entrance; if enlarged by more than 150 sq ft the whole unit is capped at 850/1,000 sq ft and the addition must meet setbacks (Table notes 3 and 4). Owner-occupancy is not required, so you can rent out the ADU.

How much does an ADU cost in Oakland?

ADU construction in Oakland typically costs $210,000-$400,000. Garage conversions run $120,000-$220,000, and prefab ADUs cost $150,000-$300,000.

How much can I rent an ADU for in Oakland?

Average ADU rents in Oakland are $2,100-$2,500/mo for a 1-bedroom and $2,700-$3,300/mo for a 2-bedroom unit.

Do I need parking for an ADU in Oakland?

None required if the lot is in the City's mapped No Parking for ADUs area: within 1/2-mile walking distance of a public transit stop, in an Area of Primary or Secondary Importance (API/ASI), where residential parking permits are required but not offered to ADU occupants, or within one block of a car-share vehicle; and none for any ADU created inside the existing or proposed house or an accessory structure (Table 17.103.01). Otherwise one space per ADU, which may be tandem (OMC 17.116.240). JADUs need no parking. No replacement parking is required when a covered or uncovered space is removed to build the ADU (OMC 17.103.080(A)(4)). In the S-9 zone a new-construction ADU is allowed only if you add one off-street space beyond what the house requires and replace any lost spaces (OMC 17.88.050(B)(1)). Check with Oakland planning department for the latest California ADU parking rules, as many states have relaxed requirements in recent years.

How long does it take to get an ADU permit in Oakland?

The permit review timeline in Oakland is State law: the City must approve or deny a complete ADU application within 60 days or it is deemed approved (Gov. Code 66317 as amended by SB 543, effective January 1, 2026). Oakland's published targets, in business days for complete applications: zoning review for ADUs 10 to 20 days; building plan check 21 days for a new ADU, or 10 days for an ADU using City pre-approved plans only; building final check 7 days to 3 weeks (3 days to 1.5 weeks with expedited overtime review). Requesting expedited overtime plan review cuts the building estimates by about 50%. Permit fees: Zoning: ADU Design Review Exemption (Categories I, II and III) $878.58 base, $1,061.45 total with the 7.2% General Plan Update and 12.70% Technology/Records surcharges; ADU Amnesty Program $1,765.74 total (Zoning Fee Schedule FY2026-27, loaded September 4, 2026). Permit application intake $134.32 online or $201.49 at the counter. Building permit (Master Fee Schedule effective July 1, 2026, R-3): new construction plan review $10.60 plus inspection $8.00 per $1,000 of construction value, each with a $335.81 minimum; alterations and additions $17.08 plus $26.11 per $1,000; electrical, plumbing and mechanical inspections $7.66, $4.79 and $4.36 per $1,000 of each trade's value; plus a 7.20% General Plan surcharge and a 12.70% Records Management and Technology fee on building fees; zoning inspection $537.28 on a new-construction residential permit. Our arithmetic for a $300,000 new detached ADU: about $6,700 in building plan-check and inspection fees plus $1,061.45 zoning, before trade permits. The City's own rule of thumb is 4-6% of project value. Separate: new sewer lateral connection permit $1,798.93 (Public Works schedule, expressly including ADUs) and the OUSD school fee of $5.17 per sq ft.

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Oakland ADU FAQ

Answers to every common question about building an ADU in Oakland — costs, rules, permits, rental income.

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Oakland ADU Costs

Detailed cost breakdown: construction $210,000-$400,000, garage conversion $120,000-$220,000, plus ROI analysis.

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Garage Conversion ADU Guide

Complete guide to costs ($80K-$180K), impact fee savings, and permits for garage-to-ADU conversions.

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California ADU Laws 2026

AB 462, AB 1154, SB 9 — every new law affecting ADU construction in California this year.

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About this information: This page is an informational summary of publicly available regulations - it is not legal, financial, or professional advice, and it is not a substitute for confirming requirements with your local planning department. Rules change frequently; always verify current requirements before designing, budgeting, or building. Last verified: 2026-09-19. Contractors we introduce are independent businesses - verify license and insurance directly before hiring. Spotted an error? Tell us - we verify against primary sources and correct quickly.

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