An ADU builder in Sacramento is a licensed contractor who designs and constructs accessory dwelling units — detached backyard units, garage conversions, attached additions, and junior ADUs (JADUs). Because an ADU is a complete second dwelling, the builder coordinates foundation, framing, plumbing, electrical, and HVAC work and pulls it through Sacramento's permit process and utility connections. Not every general contractor has built one, so the right builder is one with ADU-specific experience in California.
What ADU Builders Cost in Sacramento [19][20][21][22]
Based on our Sacramento cost data, expect the following ranges from local ADU builders. Quotes for the same scope typically vary 20-40% between contractors, so getting at least three bids is the single best way to control cost.
| New Detached ADU (all-in) | $170,000-$400,000 |
| Cost per Sq Ft | $250-$500 |
| Garage Conversion | $90,000-$200,000 |
| Prefab / Modular ADU (installed) | $170,000-$340,000 |
| City Permit & Plan Review | City fee estimate form CDD-0419 (rev. 7/12/2026), at a $170.80 per sq ft valuation: about $5,272 total for a 749 sq ft new detached ADU, $10,624 at 750 sq ft and $14,843 at 1,200 sq ft. Line items at 1,200 sq ft: building permit $1,790.36, plan review $751.95, fire administrative $176, fire inspection $294 ($0.11 per sq ft, $294 minimum), fire plan review $260, planning inspection $526, planning review $263, public works and utilities review $205 deposit each plus hourly, construction excise tax $945.60, general plan fee $533 ($2.60 per $1,000 of valuation), residential construction tax $315, technology fee $254.23. Not included: school district fees (paid to the district, form CDD-0226), regional sanitation and county sewer fees, and any water or sewer tap, housing or project-area impact fees. Optional ADU Zoning Review: $0 (was $117 before July 2026). Optional written fee estimate: $164 (form CDD-0278). Extra review time bills at $216 per hour for Building and $263 per hour for Planning |
| Impact Fees | City impact fees are zero for an ADU under 750 sq ft and switch on at 750 sq ft (CDD-0423; CDD-0419). At 750 sq ft: park development impact fee $2,617.50, SAFCA flood-control fee $1,575, Sacramento Transportation Authority mitigation fee plus 2% admin $1,154.64, about $5,347 together; at 1,200 sq ft: $4,188, $2,520 and $1,415.76. The citywide Transportation Development Impact Fee shows $0 at all three sizes, and the form notes park, SAFCA and STA fees may be lower in some infill areas. School district fees apply at any size and are collected by the district. The city's 'Reduction of Development Impact Fees' program is for deed-restricted affordable units, not a general ADU waiver |
For a full line-item breakdown, see our Sacramento ADU cost guide. To confirm what you're allowed to build before you hire, review the Sacramento ADU rules (max detached size: Local option: 1,200 sq ft for one detached ADU; with two detached ADUs their combined floor area may not exceed 1,200 sq ft, for example 400 + 800 (17.228.105(B)(2)(b)(iii)). Floor area counts everything inside the ADU's building envelope except garages and accessory structures. State option: 800 sq ft for a new detached unit (17.228.105(C)(1)(b)); owner-occupancy: Not required for an ADU. For a JADU the city code still requires the property owner to live on site unless the owner is a government agency, land trust or housing organization (17.228.105(B)(3)(b)); state law since January 1, 2026 (Gov. Code 66333(b), AB 1154) allows that requirement only when the JADU shares a bathroom with the main house, so a JADU with its own bathroom should not need owner-occupancy. Confirm with the Planning Division before relying on either reading).
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How to Vet an ADU Builder in Sacramento
- License: Confirm a current contractor's license in California and that it's in good standing. Ask for the license number and verify it with the state board.
- ADU-specific experience: Ask how many ADUs they've completed in or near Sacramento and request addresses or photos. ADU permitting and setbacks differ from a kitchen remodel.
- Portfolio & references: Get references from recent ADU clients and, if possible, visit a finished unit.
- Insurance: Verify general liability and workers' compensation coverage. Ask for a certificate of insurance.
- Written, detailed bid: Insist on an itemized, fixed-price or clearly-scoped bid — not a verbal estimate. It should state whether permits (City fee estimate form CDD-0419 (rev. 7/12/2026), at a $170.80 per sq ft valuation: about $5,272 total for a 749 sq ft new detached ADU, $10,624 at 750 sq ft and $14,843 at 1,200 sq ft. Line items at 1,200 sq ft: building permit $1,790.36, plan review $751.95, fire administrative $176, fire inspection $294 ($0.11 per sq ft, $294 minimum), fire plan review $260, planning inspection $526, planning review $263, public works and utilities review $205 deposit each plus hourly, construction excise tax $945.60, general plan fee $533 ($2.60 per $1,000 of valuation), residential construction tax $315, technology fee $254.23. Not included: school district fees (paid to the district, form CDD-0226), regional sanitation and county sewer fees, and any water or sewer tap, housing or project-area impact fees. Optional ADU Zoning Review: $0 (was $117 before July 2026). Optional written fee estimate: $164 (form CDD-0278). Extra review time bills at $216 per hour for Building and $263 per hour for Planning), plan check (Electronic Plan Check through the city's online permit portal. A detached ADU needs no fire sprinklers if the main house is unsprinklered and the ADU, excluding garage, is 1,200 sq ft or less; an attached ADU is exempt if the house is unsprinklered, the addition is no more than 50% of the original and the total stays under 3,600 sq ft. One water service per lot: the ADU ties into the house's water and sewer lines and normally needs no separate meter (City Code 13.04.070). Rooftop solar may be required under the California Energy Code; SMUD offers a free service consultation (CDD-0423, CDD-0009)), and impact fees (City impact fees are zero for an ADU under 750 sq ft and switch on at 750 sq ft (CDD-0423; CDD-0419). At 750 sq ft: park development impact fee $2,617.50, SAFCA flood-control fee $1,575, Sacramento Transportation Authority mitigation fee plus 2% admin $1,154.64, about $5,347 together; at 1,200 sq ft: $4,188, $2,520 and $1,415.76. The citywide Transportation Development Impact Fee shows $0 at all three sizes, and the form notes park, SAFCA and STA fees may be lower in some infill areas. School district fees apply at any size and are collected by the district. The city's 'Reduction of Development Impact Fees' program is for deed-restricted affordable units, not a general ADU waiver) are included.
- Permit handling: Confirm they manage Sacramento's permit process ("Ministerial building permit; no hearing or discretionary review for a code-compliant unit (17.228.105(B)(4)). In order: 1) confirm your zone and any historic or airport overlay in the Land Information Lookup App; 2) optional free ADU Zoning Review (form CDD-0009, filed through the E-Planning portal) so Planning checks setbacks, height, coverage and historic standards before you pay for construction drawings; 3) tree permit if a protected tree is affected (City Code Ch. 12.56); 4) file the building permit set through Electronic Plan Check with a scaled site plan, structural, electrical, Title 24 energy, CALGreen and solar sheets (paper sets of 11 x 17 in. or larger still accepted at the counter); 5) Building routes the set to Planning, Fire, Public Works and Utilities; 6) request an address for each ADU (form CDD-0104, up to four weeks); 7) pay fees at permit pickup. The Planning Division's ADU portal says no separate planning approval is needed before applying, while the Building Division's ADU handout (CDD-0423, rev. 1/29/2026) still says planning approval or an approved concurrent-review MOU must be obtained first; ask the Building Division (ezpermit@cityofsacramento.org) which applies to your submittal. A unit that misses a local standard may apply for discretionary Site Plan and Design Review under Ch. 17.808 (17.228.105(B)(5))", typically 60 days by law: the city must approve or deny a complete application within 60 days when there is an existing home on the lot, or the ADU is deemed approved (17.228.105(B)(4)(b)-(c), matching SB 543). If the ADU is filed with a permit for a new house the city may wait until the house is approved, and any delay you request stops the clock. Published targets (ADU portal, Step 5): optional zoning review 1-3 weeks; building plan review roughly 1.5-2 months, with review cycle 1 at 20 business days, cycle 2 at 15 and cycle 3 at 5, not counting your time to answer corrections. State law gives a 30-day decision for an application that uses a city-preapproved plan or one identical to a plan approved in the current building-code cycle (Gov. Code 65852.27(b)); ask the Building Division whether a Shelf Ready plan qualifies) and who is responsible if revisions are required.
- Payment schedule: Avoid large upfront payments. A reasonable schedule ties payments to completed milestones.
Questions to Ask Before You Hire
- How many ADUs have you built in Sacramento in the last two years?
- Is your bid fixed-price, and what would trigger a change order?
- Are permits, plan check, and utility connection fees included?
- What's a realistic timeline, including permit review (60 days by law: the city must approve or deny a complete application within 60 days when there is an existing home on the lot, or the ADU is deemed approved (17.228.105(B)(4)(b)-(c), matching SB 543). If the ADU is filed with a permit for a new house the city may wait until the house is approved, and any delay you request stops the clock. Published targets (ADU portal, Step 5): optional zoning review 1-3 weeks; building plan review roughly 1.5-2 months, with review cycle 1 at 20 business days, cycle 2 at 15 and cycle 3 at 5, not counting your time to answer corrections. State law gives a 30-day decision for an application that uses a city-preapproved plan or one identical to a plan approved in the current building-code cycle (Gov. Code 65852.27(b)); ask the Building Division whether a Shelf Ready plan qualifies) and construction?
- Who is my point of contact and how are delays communicated?
- What warranty do you provide on workmanship?
- Can you share three recent California ADU client references?
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How much do ADU builders charge in Sacramento?
ADU builders in Sacramento typically quote $170,000-$400,000 for a new detached unit, or about $250-$500 per square foot, including design, permitting, and construction. A garage conversion runs $90,000-$200,000 and a prefab/modular ADU averages $170,000-$340,000. Add city permit and plan-review fees (City fee estimate form CDD-0419 (rev. 7/12/2026), at a $170.80 per sq ft valuation: about $5,272 total for a 749 sq ft new detached ADU, $10,624 at 750 sq ft and $14,843 at 1,200 sq ft. Line items at 1,200 sq ft: building permit $1,790.36, plan review $751.95, fire administrative $176, fire inspection $294 ($0.11 per sq ft, $294 minimum), fire plan review $260, planning inspection $526, planning review $263, public works and utilities review $205 deposit each plus hourly, construction excise tax $945.60, general plan fee $533 ($2.60 per $1,000 of valuation), residential construction tax $315, technology fee $254.23. Not included: school district fees (paid to the district, form CDD-0226), regional sanitation and county sewer fees, and any water or sewer tap, housing or project-area impact fees. Optional ADU Zoning Review: $0 (was $117 before July 2026). Optional written fee estimate: $164 (form CDD-0278). Extra review time bills at $216 per hour for Building and $263 per hour for Planning) plus impact fees of City impact fees are zero for an ADU under 750 sq ft and switch on at 750 sq ft (CDD-0423; CDD-0419). At 750 sq ft: park development impact fee $2,617.50, SAFCA flood-control fee $1,575, Sacramento Transportation Authority mitigation fee plus 2% admin $1,154.64, about $5,347 together; at 1,200 sq ft: $4,188, $2,520 and $1,415.76. The citywide Transportation Development Impact Fee shows $0 at all three sizes, and the form notes park, SAFCA and STA fees may be lower in some infill areas. School district fees apply at any size and are collected by the district. The city's 'Reduction of Development Impact Fees' program is for deed-restricted affordable units, not a general ADU waiver. Quotes for the same scope commonly vary 20-40% between builders, so collect at least three bids.
How do I find a good ADU builder in Sacramento?
Look for a licensed contractor with completed ADU projects in Sacramento specifically — ADUs involve local zoning, setback rules, and utility connections that general remodelers may not have handled. Verify the license, ask for an ADU-specific portfolio and references, confirm they carry liability and workers' comp insurance, and get a written fixed-price or detailed bid. Submit a request below and we'll forward it to local ADU builders serving Sacramento for free quotes.
Do ADU builders in Sacramento handle permits?
Most full-service ADU builders manage the permit process for you. In Sacramento the approval process is "Ministerial building permit; no hearing or discretionary review for a code-compliant unit (17.228.105(B)(4)). In order: 1) confirm your zone and any historic or airport overlay in the Land Information Lookup App; 2) optional free ADU Zoning Review (form CDD-0009, filed through the E-Planning portal) so Planning checks setbacks, height, coverage and historic standards before you pay for construction drawings; 3) tree permit if a protected tree is affected (City Code Ch. 12.56); 4) file the building permit set through Electronic Plan Check with a scaled site plan, structural, electrical, Title 24 energy, CALGreen and solar sheets (paper sets of 11 x 17 in. or larger still accepted at the counter); 5) Building routes the set to Planning, Fire, Public Works and Utilities; 6) request an address for each ADU (form CDD-0104, up to four weeks); 7) pay fees at permit pickup. The Planning Division's ADU portal says no separate planning approval is needed before applying, while the Building Division's ADU handout (CDD-0423, rev. 1/29/2026) still says planning approval or an approved concurrent-review MOU must be obtained first; ask the Building Division (ezpermit@cityofsacramento.org) which applies to your submittal. A unit that misses a local standard may apply for discretionary Site Plan and Design Review under Ch. 17.808 (17.228.105(B)(5))" with a typical review timeline of 60 days by law: the city must approve or deny a complete application within 60 days when there is an existing home on the lot, or the ADU is deemed approved (17.228.105(B)(4)(b)-(c), matching SB 543). If the ADU is filed with a permit for a new house the city may wait until the house is approved, and any delay you request stops the clock. Published targets (ADU portal, Step 5): optional zoning review 1-3 weeks; building plan review roughly 1.5-2 months, with review cycle 1 at 20 business days, cycle 2 at 15 and cycle 3 at 5, not counting your time to answer corrections. State law gives a 30-day decision for an application that uses a city-preapproved plan or one identical to a plan approved in the current building-code cycle (Gov. Code 65852.27(b)); ask the Building Division whether a Shelf Ready plan qualifies. Confirm in writing whether permit fees, plan check (Electronic Plan Check through the city's online permit portal. A detached ADU needs no fire sprinklers if the main house is unsprinklered and the ADU, excluding garage, is 1,200 sq ft or less; an attached ADU is exempt if the house is unsprinklered, the addition is no more than 50% of the original and the total stays under 3,600 sq ft. One water service per lot: the ADU ties into the house's water and sewer lines and normally needs no separate meter (City Code 13.04.070). Rooftop solar may be required under the California Energy Code; SMUD offers a free service consultation (CDD-0423, CDD-0009)), and impact fees are included in the bid or billed separately.
How long does it take to build an ADU in Sacramento?
Plan for the permit review (60 days by law: the city must approve or deny a complete application within 60 days when there is an existing home on the lot, or the ADU is deemed approved (17.228.105(B)(4)(b)-(c), matching SB 543). If the ADU is filed with a permit for a new house the city may wait until the house is approved, and any delay you request stops the clock. Published targets (ADU portal, Step 5): optional zoning review 1-3 weeks; building plan review roughly 1.5-2 months, with review cycle 1 at 20 business days, cycle 2 at 15 and cycle 3 at 5, not counting your time to answer corrections. State law gives a 30-day decision for an application that uses a city-preapproved plan or one identical to a plan approved in the current building-code cycle (Gov. Code 65852.27(b)); ask the Building Division whether a Shelf Ready plan qualifies in Sacramento) plus construction. Most detached ADUs take 4-8 months of construction after permits are issued; garage conversions and prefab units are often faster. Ask each builder for a realistic schedule and what could delay it.
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