ADU Rules in Corona, California

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

Max Size: 1,200 sq ft (CMC 17.85.040(D)). The ADU plus the main house must also stay within the zone's lot-coverage limit, but no standard may block an ADU of at least 800 sq ft and 16 ft in height (17.85.040(E)). An ADU built inside existing space of the house or an accessory building has no size cap. Setbacks: 4 ft maximum for a new attached or detached ADU, including lot lines along a street (CMC 17.85.040(F)(2)); none for conversions of existing living area or accessory structures, or for a rebuild in the same location and dimensions (F)(1). The city's ADU guide sheet also asks for 5 ft between an ADU and the main house or other accessory buildings. Parking: Varies Verified: 2026-09-20
ADU Score: 6/10
Moderately friendly · how we score

Are ADUs allowed in Corona, CA? [1][2][3][4][5][6]

Yes. Corona allows ADUs on most residential lots. A detached unit can be up to 1,200 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 size1,200 sq ft (CMC 17.85.040(D)). The ADU plus the main house must also stay within the zone's lot-coverage limit, but no standard may block an ADU of at least 800 sq ft and 16 ft in height (17.85.040(E)). An ADU built inside existing space of the house or an accessory building has no size cap.
SetbacksRear 4 ft maximum for a new attached or detached ADU, including lot lines along a street (CMC 17.85.040(F)(2)); none for conversions of existing living area or accessory structures, or for a rebuild in the same location and dimensions (F)(1). The city's ADU guide sheet also asks for 5 ft between an ADU and the main house or other accessory buildings. · Side 4 ft maximum for new construction (CMC 17.85.040(F)(2)); none for conversions or same-footprint rebuilds (F)(1). A JADU follows the primary home's setbacks (17.85.050(H)). No passageway to the street is required (17.85.030(I)).
Parking1 space per ADU or per bedroom, whichever is less, for a new attached or detached ADU; an existing driveway at least 20 ft deep counts, and spaces must be paved or decomposed granite (CMC 17.85.040(B)). None required within 1/2 mile walking distance of transit, in a historic district, for a conversion of the house or an accessory building, where street permits are not offered to the ADU, or within a block of a car-share (17.85.040(C)). Spaces removed for an ADU need no replacement.
Owner-occupancyNot required for an ADU. Required for a JADU: the owner must live in either the main house or the JADU, with a deed restriction recorded before the building permit issues (CMC 17.85.050(B), (D)). State law since Jan 1, 2026 lets a city require this only when the JADU shares a bathroom with the house (Gov. Code 66333(b), AB 1154), and Corona's text has not yet been updated, so confirm with Planning, (951) 736-2262.

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

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

Permit fees$2,466 for a garage-to-ADU conversion (plan check $1,383.61 + inspection $1,082.60; $2,684 from Oct 4, 2026 under Res. 2026-085) and up; a new ADU is priced per sq ft as new single-family construction (Table A: $3,611 at 2,000 sq ft, Type V-B) plus 5% General Plan maintenance.
Typical timelineThe city must act within 60 days of a complete application (CMC 17.85.060; Gov. Code 66317 deemed-approval backstop). Published Building Division targets (ADU flow chart, March 2026): first review 10 business days, rechecks 5, plus 2 days processing and 3 days to issue the permit.

Three things to know before you build in Corona

  • Cost basis: Inland Empire ranges from CaliFirst Remodel (May 2026), Dynamic Quality Builders (Feb 2026), LA Metro Home Finder (June 2026), Custom Home Design & Build (Feb 2026), GatherADU (May 2025) and Autonomous (Feb 2026); Corona publishes no city-specific construction cost data
  • Corona's 1,200 sq ft detached cap is the state maximum and beats the 800-1,000 sq ft limits in some neighboring cities, so a 2-3 bedroom ADU pencils here; the 4-ft setback applies to street-side lot lines too (CMC 17.85.040(F)(2))
  • A conversion of existing living area pays no water or sewer capacity charge (CMC 17.85.030(F)-(G)); a garage is excluded from 'living area' in 17.85.020(C), so ask Development Services, (951) 736-2259, whether a garage conversion is charged before you budget

Last verified 2026-09-20 against Corona planning code. How we verify

Corona allows ADUs and JADUs by right on any lot zoned single-family, multifamily or residential/commercial mixed-use that has an existing or proposed home, under Corona Municipal Code Chapter 17.85 (rewritten by Ordinance No. 3410 in 2025 and codified in the 2025 S-56 supplement). A detached ADU may be up to 1,200 sq ft, an attached ADU up to 50% of the main house and a JADU up to 500 sq ft, with 4-ft side and rear setbacks and the zone's height limit (state law guarantees at least 16 ft, or 18 ft near transit). Permits are ministerial through Building Division plan check: the city must act within 60 days, and its 2026 flow chart promises a 10-business-day first review. The city lists no development impact fee for ADUs except a prorated habitat (MSHCP) fee on units of 750 sq ft or more; a new attached or detached ADU also pays a sewer capacity charge (about $3,096 for a secondary unit) and a proportionate water charge.

Zoning & Size Requirements [1][2][3][4][5][6]

Yes — Corona allows ADUs. A detached ADU can typically be up to 1,200 sq ft under current California and Corona zoning rules.

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

Allowed ZonesAny lot zoned single-family residential, multifamily residential or residential/commercial mixed-use that has an existing or proposed primary dwelling (CMC 17.85.030(C)); the applicant must be the property owner (17.85.030(D)). A manufactured home on a permanent foundation qualifies as an ADU in any zone (17.85.040(H)).
Max Size (Detached)1,200 sq ft (CMC 17.85.040(D)). The ADU plus the main house must also stay within the zone's lot-coverage limit, but no standard may block an ADU of at least 800 sq ft and 16 ft in height (17.85.040(E)). An ADU built inside existing space of the house or an accessory building has no size cap.
Max Size (Attached)50% of the primary unit's floor area (CMC 17.85.040(D)); the 800 sq ft floor in 17.85.040(E) still applies. The house or accessory building may be expanded by up to 150 sq ft for ingress and egress to a conversion ADU or JADU (17.85.030(J)).
Max Size (JADU)500 sq ft, built within the walls of an existing or proposed single-family home (CMC 17.85.050(D)(2), (E)); needs an independent exterior entrance and an efficiency kitchen (cooking appliance, food-prep counter and storage cabinets) (17.85.050(F), (G)).
Max HeightThe height limit of the underlying zone applies; Corona sets no ADU-specific height (CMC 17.85.040(F)). State floors control: 16 ft for a detached ADU, 18 ft within 1/2 mile of a major transit stop or on a multistory multifamily lot, and 25 ft or the zone limit, whichever is lower, for an attached ADU (Gov. Code 66321(b)(4)).
Max UnitsSingle-family lots: up to 2 units in one of three combinations: 1 detached ADU plus either 1 JADU or 1 attached/interior ADU; 1 JADU plus 1 interior ADU; or 2 JADUs (CMC 17.85.030(K)(1)). Existing multifamily: non-livable space (storage, garages, attics) may be converted, 1 ADU or JADU may go inside up to 25% of the existing units, and up to 8 detached ADUs are allowed, not exceeding the number of existing units (K)(2). Proposed multifamily: up to 2 detached ADUs (K)(3).

Setback Requirements [1][2][3][4][5][6]

Corona 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 maximum for a new attached or detached ADU, including lot lines along a street (CMC 17.85.040(F)(2)); none for conversions of existing living area or accessory structures, or for a rebuild in the same location and dimensions (F)(1). The city's ADU guide sheet also asks for 5 ft between an ADU and the main house or other accessory buildings.
Side Setback4 ft maximum for new construction (CMC 17.85.040(F)(2)); none for conversions or same-footprint rebuilds (F)(1). A JADU follows the primary home's setbacks (17.85.050(H)). No passageway to the street is required (17.85.030(I)).
Front SetbackThe underlying zone's front setback applies (CMC 17.85.040(F)). The front-yard landscaped area must be kept and cannot be removed to create ADU parking (17.85.040(B)(4)).
Parking Required1 space per ADU or per bedroom, whichever is less, for a new attached or detached ADU; an existing driveway at least 20 ft deep counts, and spaces must be paved or decomposed granite (CMC 17.85.040(B)). None required within 1/2 mile walking distance of transit, in a historic district, for a conversion of the house or an accessory building, where street permits are not offered to the ADU, or within a block of a car-share (17.85.040(C)). Spaces removed for an ADU need no replacement.
Owner OccupancyNot required for an ADU. Required for a JADU: the owner must live in either the main house or the JADU, with a deed restriction recorded before the building permit issues (CMC 17.85.050(B), (D)). State law since Jan 1, 2026 lets a city require this only when the JADU shares a bathroom with the house (Gov. Code 66333(b), AB 1154), and Corona's text has not yet been updated, so confirm with Planning, (951) 736-2262.
Min Lot SizeNone (CMC 17.85.030(C); city ADU guide sheet, rev. 10/2024).

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

An ADU permit in Corona goes through a ministerial, by-right review. Typical timeline: The city must act within 60 days of a complete application (CMC 17.85.060; Gov. Code 66317 deemed-approval backstop). Published Building Division targets (ADU flow chart, March 2026): first review 10 business days, rechecks 5, plus 2 days processing and 3 days to issue the permit. Fees range from $2,466 for a garage-to-ADU conversion (plan check $1,383.61 + inspection $1,082.60; $2,684 from Oct 4, 2026 under Res. 2026-085) and up; a new ADU is priced per sq ft as new single-family construction (Table A: $3,611 at 2,000 sq ft, Type V-B) plus 5% General Plan maintenance.

Approval ProcessMinisterial plan check through the Building Division, no hearing (CMC 17.85.060). Confirm zoning with Planning first, (951) 736-2262, then submit online through eTRAKiT per the Plan Check Submittal Requirements; the owner must be the applicant. Grading, fire-sprinkler, landscape and solar plans are separate submittals, and the 2026 ADU flow chart says grading must be approved before the building plan. An ADU filed with a new house waits until the house permit issues.
Review TimelineThe city must act within 60 days of a complete application (CMC 17.85.060; Gov. Code 66317 deemed-approval backstop). Published Building Division targets (ADU flow chart, March 2026): first review 10 business days, rechecks 5, plus 2 days processing and 3 days to issue the permit.
Permit Fees$2,466 for a garage-to-ADU conversion (plan check $1,383.61 + inspection $1,082.60; $2,684 from Oct 4, 2026 under Res. 2026-085) and up; a new ADU is priced per sq ft as new single-family construction (Table A: $3,611 at 2,000 sq ft, Type V-B) plus 5% General Plan maintenance.
Impact FeesThe city's DIF schedule effective 7/1/2026 lists no city impact fee for ADUs except the MSHCP habitat fee, prorated for ADUs of 750 sq ft or more ($4,632 x ADU sq ft / house sq ft); ADUs of 750 sq ft or less are exempt from all impact fees under Gov. Code 66311.5(c). A new attached or detached ADU pays a sewer capacity charge (Development Services rates a secondary unit at 200 gpd x $15.48 = $3,096) and a water capacity charge proportionate to its size or fixture units (CMC 17.85.030(G)); JADUs and conversions of existing living area are exempt (17.85.030(F), 17.85.050(J)). TUMF is paid to WRCOG and school fees to Corona-Norco USD; confirm both with Development Services, (951) 736-2259.
Plan CheckSubmit through eTRAKiT with the Building Plan Check Submittal Checklist; structural plans must come from a licensed architect or engineer unless the unit is conventional wood-frame construction of two stories or less; plot easements and overhead-line clearances (GO 95); fire sprinklers only if the main house requires them (CMC 17.85.040(J)); the ADU must match the main house in style, roof pitch, color and exterior materials (17.85.040(I)); a separate entrance is required (17.85.040(G)).
Pre-Approved PlansNone. Corona publishes no pre-approved or permit-ready ADU plan set on its Building or Planning pages (checked 9/20/2026); ask the Building Division, (951) 736-2250, whether a program under Gov. Code 65852.27 exists. Riverside County's Permit Ready ADU plans are a county program for unincorporated areas and do not apply inside the city.

Get Free ADU Quotes in Corona

Tell us about your project and we'll pass it to ADU builders serving Corona. Free, no obligation — you choose who to work with. We don't have builders in every area yet; if nobody covers yours, we'll email you to say so.

1. Tell us your project
Takes about a minute.
2. We match local pros
Up to 5 independent local ADU builders — never more, and we tell them nothing you don't submit here.
3. You choose
Compare quotes, verify license & insurance, hire (or don't). No spam either way.

+ Add project details (optional — helps builders quote faster)
+ Add budget (optional — helps builders scope the right design)

🔒 Your info is secure. We share it only with contractors quoting your project. No spam, no obligation.

Just browsing? Search ADU builders near you by ZIP code.

Construction Costs [14][15][16][17][18][19]

Building an ADU in Corona typically costs $180,000-$320,000 ($180-$300 per sq ft); a garage conversion runs $70,000-$150,000.

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

Average Build Cost$180,000-$320,000
Cost per Sq Ft$180-$300
Garage Conversion$70,000-$150,000
Prefab ADU (Installed)$120,000-$250,000

Finance Your ADU Project

Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders.

Some links on this page are affiliate links. We may earn a commission at no extra cost to you. Learn more

Rental Income Potential [20][21][22][23]

A 2-bedroom ADU in Corona rents for around $2,350-$2,600/mo, an estimated 6-11% gross rental yield on a $180,000-$320,000 detached build at $1,800-$2,600/mo; roughly 14-30% gross on a $70,000-$150,000 garage conversion; before vacancy, taxes and financing.

Avg Rent (1 Bedroom)$1,800-$2,150/mo
Avg Rent (2 Bedroom)$2,350-$2,600/mo
Short-Term RentalNo. Rentals shorter than 30 days are prohibited for both the ADU and the primary unit on the lot (CMC 17.85.030(E)); the same 30-day floor applies to a JADU and its main house (17.85.050(C)).
Est. Annual ROI6-11% gross rental yield on a $180,000-$320,000 detached build at $1,800-$2,600/mo; roughly 14-30% gross on a $70,000-$150,000 garage conversion; before vacancy, taxes and financing

Explore Prefab ADU Options

Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half.

Some links on this page are affiliate links. We may earn a commission at no extra cost to you. Learn more

Recent Law Changes

What's Changed Recently

  • 2026-09-20: entry re-verified against CMC Chapter 17.85 as codified (American Legal, 2025 S-56 supplement), the Development Impact Fee schedule effective July 1, 2026, the Citywide Master Fee Recovery Schedule (Res. 2026-085, effective Oct 4, 2026) and the March 2026 ADU plan-check flow chart; fees, impact fees, review times and rents updated
  • Building plan-check and inspection fees rise on Oct 4, 2026 under Resolution 2026-085: garage-to-ADU plan check $1,383.61 to $1,565 and inspection $1,082.60 to $1,119; Table A new-construction rates rise about 15%
  • Development Impact Fee schedule effective July 1, 2026 lists ADUs of 750 sq ft or more as their own category with only the prorated MSHCP fee ($4,632 x ADU sq ft / house sq ft); the MSHCP rate rises again July 1, 2027
  • Ordinance No. 3410 (2025) rewrote Chapter 17.85 for SB 1211 and AB 2533: up to 8 detached ADUs on existing multifamily lots, no replacement parking for converted or demolished spaces, and a legalization path for pre-2020 unpermitted units (17.85.080)
  • No ADU amendment since Ord. 3410: Ordinances 3426-3433 (Feb-Sept 2026) cover mobilehome rent, TUMF, religious facilities, e-bikes, landscaping and fences, solicitors and special events; the JADU owner-occupancy text in 17.85.050(B) has not yet been conformed to AB 1154 (effective Jan 1, 2026)

Tips for Building an ADU in Corona

  • Cost basis: Inland Empire ranges from CaliFirst Remodel (May 2026), Dynamic Quality Builders (Feb 2026), LA Metro Home Finder (June 2026), Custom Home Design & Build (Feb 2026), GatherADU (May 2025) and Autonomous (Feb 2026); Corona publishes no city-specific construction cost data
  • Corona's 1,200 sq ft detached cap is the state maximum and beats the 800-1,000 sq ft limits in some neighboring cities, so a 2-3 bedroom ADU pencils here; the 4-ft setback applies to street-side lot lines too (CMC 17.85.040(F)(2))
  • A conversion of existing living area pays no water or sewer capacity charge (CMC 17.85.030(F)-(G)); a garage is excluded from 'living area' in 17.85.020(C), so ask Development Services, (951) 736-2259, whether a garage conversion is charged before you budget
  • Sewer capacity: the Development Services handout rates a secondary unit at 200 gpd x $15.48 = $3,096, against $4,644 for a full house; a new separate 5/8-inch water service carries a $6,699 capacity fee (Utilities fee list, Dec 2024), so keep the ADU on the existing meter where the code allows
  • Submit grading first: the city's ADU flow chart requires an approved grading plan before the building plan is approved, and a driveway at least 20 ft deep satisfies the parking requirement without new paving
  • Match roof pitch, color and exterior materials to the main house; architectural compatibility is a code requirement (CMC 17.85.040(I)), not a suggestion
  • If you have an unpermitted ADU or JADU built before January 1, 2020, CMC 17.85.080 routes legalization through the state amnesty statute (Gov. Code 66311.7, which the city's text still cites under its former number); the city generally cannot deny a permit to bring it into compliance
  • Cost basis (2026-09-20 re-verification): short term allowed: No. Rentals shorter than 30 days are prohibited for both the ADU and the primary unit on the lot (CMC 17.85.030(E)); the same 30-day floor applies to a JADU and its main house (17.85.050(C)). Neither an ADU nor a JADU may be sold separately from the main home.

ADU Builders in Corona

Looking for an ADU builder in Corona? ADU projects need a contractor experienced with local zoning, the permit process, and utility connections — not every general contractor has built one. We match Corona homeowners with experienced local ADU contractors who provide free, no-obligation quotes. Getting at least three bids typically saves 20-40% on the same scope.

Sources & References

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

  1. Corona Municipal Code Chapter 17.85 Accessory Dwelling Unit, Sections 17.85.010-.030 (2025 S-56 supplement; Ord. 3410 s. 4, 2025), American Legal Publishing Municipal Code — Accessed 2026-09-20
  2. Corona Municipal Code Sections 17.85.040-.080 (development standards, JADUs, review, fees, non-permitted units), American Legal Publishing Municipal Code — Accessed 2026-09-20
  3. Accessory Dwelling Unit Guide Sheet, Corona Municipal Code Chapter 17.85 (Planning Division, rev. 10/2024) Planning Department — Accessed 2026-09-20
  4. City Clerk public notices: adopted Ordinances 3426-3433 (Feb-Sept 2026), City of Corona city_website — Accessed 2026-09-20
  5. Gov. Code 66321 (state ADU height and setback floors) and 66323 (800 sq ft / 8 detached multifamily ADUs), California Legislative Information state_statute — Accessed 2026-09-20
  6. Gov. Code 66333 (JADU standards; owner-occupancy only with shared sanitation, AB 1154 effective Jan 1, 2026), California Legislative Information state_statute — Accessed 2026-09-20
  7. Accessory Dwelling Units (ADU's) Permit Review Process flow chart, Plan Check Division (rev. March 2026) building_dept — Accessed 2026-09-20
  8. Citywide Master Fee Recovery Schedule, Resolution 2026-085 (effective October 4, 2026), Building Division Tables A and B, City of Corona Finance fee_schedule — Accessed 2026-09-20
  9. Development Impact Fees effective 7/1/2026 (revised 7/06/2026), Development Services Division, City of Corona fee_schedule — Accessed 2026-09-20
  10. Sewer Application Fees handout, sewer capacity fee $15.48/gpd (Ord. 2911, 2947, 3212), Development Services Division fee_schedule — Accessed 2026-09-20
  11. Utilities Department Fees as of December 16, 2024, water supply (capacity) fees by meter size, City of Corona Utilities fee_schedule — Accessed 2026-09-20
  12. Building Division: plan check submittal requirements, fee tables and ADU flow chart, City of Corona building_dept — Accessed 2026-09-20
  13. Gov. Code 66311.5 (impact fees: ADUs of 750 sq ft or less exempt; larger units proportionate), California Legislative Information state_statute — Accessed 2026-09-20
  14. ADU Costs in California (2026): City-by-City Numbers, Inland Empire section (May 28, 2026), CaliFirst Remodel industry — Accessed 2026-09-20
  15. ADU Cost in Southern California: Complete 2026 Pricing Guide by County, Riverside County (Feb. 5, 2026), Dynamic Quality Builders industry — Accessed 2026-09-20
  16. ADU Permit Rules: Inland Empire Cities 2026, cost per sq ft and garage conversions (June 12, 2026), LA Metro Home Finder industry — Accessed 2026-09-20
  17. Garage Conversion Cost California 2026 (Feb. 17, 2026), Custom Home Design & Build industry — Accessed 2026-09-20
  18. How much does a Garage Conversion ADU cost in Riverside County? (May 7, 2025), GatherADU industry — Accessed 2026-09-20
  19. Prefab ADUs in Southern California: Complete Guide for 2026 (Feb. 26, 2026), Autonomous industry — Accessed 2026-09-20
  20. HUD FY2026 Advisory Small Area Fair Market Rents, Riverside-San Bernardino-Ontario MSA, ZIPs 92879-92883 (Corona) Government Data — Accessed 2026-09-20
  21. Average Rent in Corona, CA (data as of Aug. 31, 2026), RentCafe Market Data — Accessed 2026-09-20
  22. Corona, CA Rental Market Report, median rents by bedroom (Sept. 2026), ApartmentAdvisor Market Data — Accessed 2026-09-20
  23. Average Rent in Corona, CA and Rent Price Trends (updated Sept. 20, 2026), Zumper Market Data — Accessed 2026-09-20

Frequently Asked Questions

Can I build an ADU in Corona?

Yes. ADUs are allowed in Any lot zoned single-family residential, multifamily residential or residential/commercial mixed-use that has an existing or proposed primary dwelling (CMC 17.85.030(C)); the applicant must be the property owner (17.85.030(D)). A manufactured home on a permanent foundation qualifies as an ADU in any zone (17.85.040(H)). in Corona. The maximum size for a detached ADU is 1,200 sq ft (CMC 17.85.040(D)). The ADU plus the main house must also stay within the zone's lot-coverage limit, but no standard may block an ADU of at least 800 sq ft and 16 ft in height (17.85.040(E)). An ADU built inside existing space of the house or an accessory building has no size cap.. Owner-occupancy is not required, so you can rent out the ADU.

How much does an ADU cost in Corona?

ADU construction in Corona typically costs $180,000-$320,000. Garage conversions run $70,000-$150,000, and prefab ADUs cost $120,000-$250,000.

How much can I rent an ADU for in Corona?

Average ADU rents in Corona are $1,800-$2,150/mo for a 1-bedroom and $2,350-$2,600/mo for a 2-bedroom unit.

Do I need parking for an ADU in Corona?

1 space per ADU or per bedroom, whichever is less, for a new attached or detached ADU; an existing driveway at least 20 ft deep counts, and spaces must be paved or decomposed granite (CMC 17.85.040(B)). None required within 1/2 mile walking distance of transit, in a historic district, for a conversion of the house or an accessory building, where street permits are not offered to the ADU, or within a block of a car-share (17.85.040(C)). Spaces removed for an ADU need no replacement.. Check with Corona 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 Corona?

The permit review timeline in Corona is The city must act within 60 days of a complete application (CMC 17.85.060; Gov. Code 66317 deemed-approval backstop). Published Building Division targets (ADU flow chart, March 2026): first review 10 business days, rechecks 5, plus 2 days processing and 3 days to issue the permit.. Fees range from $2,466 for a garage-to-ADU conversion (plan check $1,383.61 + inspection $1,082.60; $2,684 from Oct 4, 2026 under Res. 2026-085) and up; a new ADU is priced per sq ft as new single-family construction (Table A: $3,611 at 2,000 sq ft, Type V-B) plus 5% General Plan maintenance.

Ready to Build in Corona?

Get free, no-obligation quotes from top-rated ADU contractors in Corona.

Get Free Quotes →

Build ADUs in Corona?

Homeowners read this page while planning, then ask us to connect them with a local builder. We pass those requests to builders who cover Corona — a flat fee only on the leads you accept, no subscription, and you contract directly with the homeowner.

See who's waiting in California →

ADU Guides for Corona Homeowners

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: 2026-09-20. 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.

Stay Updated on ADU Law Changes

Get notified when ADU regulations change in your city. Free — no spam, unsubscribe anytime.