Which cities let you skip custom design with permit-ready ADU plans — the full list, updated as programs change.
41 of the 125 cities we track run an active pre-approved ADU plan program, and 15 more have limited or in-progress options. Using a pre-approved plan typically saves $3,000–$15,000 in design fees and weeks-to-months of plan review. In California, AB 1332 (Gov. Code §65852.27) requires every city and county to operate a preapproval program since January 1, 2025 — though program quality varies widely.
| City | Program details | More |
|---|---|---|
| Buckeye, AZ | Yes — three pre-approved ADU plans, Buckeye Casita 200, Saguaro Casita 600 and Sonoran Casita 1000 (square feet — the three sizes A.R.S. §9-461.20(A)(4) requires from July 1, 2026), each with three elevations and a floor plan, under the Pre-Approved Housing and ADU Design Plan Program; three house plans at 1,200, 1,600 and 2,000 sq ft sit alongside them. Any deviation (wall changes, slab to wood floor, structural or truss changes) voids the pre-approval | costs |
| Glendale, AZ | Yes — the Glendale Permit-Ready Plan Program (live 2026, meeting A.R.S. §9-461.20) offers three free ADU plans: a 204 sq ft studio, a 512 sq ft 2-bedroom (36 ft × 16 ft) and a 994 sq ft 2-bedroom with study, each in ranch, contemporary and Spanish elevations, plus three house plans. No modifications allowed. Site plan review costs $61.44 planning + $122.88 building + $35.89 engineering with a 10-business-day target, then permit and impact fees | costs |
| Tempe, AZ | Yes, partly: the ADU and Single-Family Standard Plan Library (opened for ARS 9-461.20 submittals on July 1, 2026) held one pre-reviewed detached ADU plan as of Sept 20, 2026, a 600 sq ft studio/1-bath from the 2025 AARP ADU Design Challenge; the other nine challenge winners are not yet licensed. Plans are licensed from the designer, then submitted for a building permit. | costs |
| Tucson, AZ | Yes. The city's Casita Model Plan Library (casitas.tucsonaz.gov) listed 11 pre-approved designs in September 2026: 6 design-competition winners and 5 other approved plans, together offering about 20 floor-plan options from a 156 sq ft studio to a 1,000 sq ft two-bedroom, two-bath unit. Plans are licensed from their designers for a one-time fee set by the designer (not paid to the city); the license does not transfer ownership, and any change to the plan sends it back through full review. You still submit a site plan showing utility routes and pay the building permit and impact fees, but the construction-document review fee is waived and the permit runs in the Fast Lane. Model plans are valid for one year and renewable until the residential code changes; Arizona-certified modular designs can also be added to the library | costs |
| Anaheim, CA | Yes. The city's Pre-Approved Plan Catalogue lists four free detached plans (Sept 2026): Plan 001 studio 224 sq ft, Plan 002 one-bedroom 499 sq ft, Plan 003 two-bedroom 990 sq ft and Plan 004 three-bedroom 1,199 sq ft, all updated to the Building Code requirements effective July 1, 2024; no prefab or modular plans are listed yet. The plans may be used in standard plan check or through ADU Express, where they cannot be modified and conversions, expansions and attached ADUs are not eligible. Check eligibility by address with the ADU Express Eligibility Tool, then email ADUExpress@anaheim.net with the plan number and meter-spot report | costs |
| Berkeley, CA | Yes — the city points applicants to pre-approved ADU designs as a faster, less expensive path to permit approval | costs |
| Burbank, CA | Yes. The BPAP Library currently lists one city-approved design, BPAP 24001, a 432 sq ft one-story studio, plus one accepted LADBS standard plan, ADU17, a 360 sq ft studio. The July 2024 city FAQ said 12 LADBS plans were accepted, so ask Building & Safety, (818) 238-5220, which are still accepted before buying plans. The homeowner buys the plans from the designer, submits a site plan, G001 sheet and the BWP forms, and staff append the stamped plans in ProjectDox | costs |
| Chula Vista, CA | Yes. City Standard ADU Plans: 6 detached designs (498, 748, 749 rectangular, 749 L-shape, 999 and 1,199 sq ft; 1-3 BR), each also offered mirrored, for 12 plan sets, free to download from the city's ADU page. They get 14-business-day review and about $1,000 lower plan review fees ($3,951 vs $4,963 total). You must contract with the plan's designer, sign the hold-harmless agreement and affidavit, and add site-specific engineering; the city also approves designer-submitted standard plans. Posted sets may predate the 2025 California Building Code cycle in force since Jan 1, 2026, so confirm with Development Services before relying on the 14-day track. | costs |
| Citrus Heights, CA | Yes. The Permit-Ready ADU Program (LEAP-grant funded) offers three city-owned plan sets free of charge: a 496 sq ft one-bedroom, a 599 sq ft one-bedroom and a 749 sq ft two-bedroom, each 16 ft tall with a choice of roof lines and exterior finishes, accessible features and a mirrored layout; all are pre-approved by the Building Division (drawn to the 2019 California Residential Code, so confirm the current set with Building before you order). The city also accepts designers' plans for AB 1332 pre-approval (Gov. Code §65852.27), but as of September 2026 no vendor has submitted any, so the Preapproved Vendor list is empty. | costs |
| Elk Grove, CA | Yes. The city publishes its own pre-approved ADU plan set for the Over the Counter program, including a 2-bedroom 746 sq ft unit (Plan 3) issued on the 2025 California codes. The current count of plans, the 1-bedroom size and whether they remain free could not be re-read on 9/20 (city site behind a bot check); confirm with the Building Division. State law also lets you submit any plan already approved on a different lot in the same code cycle for a 30-day review (Gov. Code 65852.27). | costs |
| Escondido, CA | Yes. The Pre-Approved ADU Program (PAADU) offers four city-reviewed detached plans for download: Plan 1 studio or 1BR/1BA 484 sq ft, Plan 2 2BR/1BA 644 sq ft, Plan 3 2BR/2BA 851 sq ft, Plan 4 2-3BR/2BA 1,000 sq ft; all four were listed as available in Sept. 2026 after the 2025 suspension of Plans 3 and 4 ended. Plans are not site-specific and a standard building permit is still required; Plans 3 and 4 exceed the 800 sq ft State Exempt cap, so they are reviewed as Standard ADUs. | costs |
| Fontana, CA | Yes. Fontana's Standard ADU Plans program (AB 1332, Gov. Code 65852.27) posts three pre-approved detached plans: 462 sq ft (1 bed/1 bath), 738 sq ft (2 bed/2 bath) and 1,143 sq ft (3 bed/2 bath). The plan sets are free to download from the city site; you still submit a site-specific plan and pay permit fees. | costs |
| Fremont, CA | Yes, but the library is thin right now: on January 1, 2026 the 2025 California codes invalidated every plan preapproved under the 2022 cycle, and as of September 2026 one updated plan (1 bed/1 bath, 499 sq ft) is valid while nine 2022-cycle plans (496-1,000 sq ft) await resubmittal. The program covers detached ADUs only; you contract with the plan's designer and still submit site-specific plans, studies and engineering. | costs |
| Fresno, CA | Yes: five free construction-drawing sets, each in Contemporary, Craftsman or Gable elevations. Plan 1 = 340 sq ft studio (23-TADU-001), Plan 2 = 499 sq ft 1-bed (002), Plan 3 = 625 sq ft 1-2 bed (003), Plan 4 = 625 sq ft over a 625 sq ft garage (004), Plan 5 = 1,015 sq ft 3-bed 2-bath (005). Plans include solar; sprinklers are required if the main house is sprinklered. City estimate (Oct 2025) for permit, impact and utility fees: $7,958-$8,444 for Plans 1-4 and $15,610 for Plan 5; all-in with ICC-average construction $65,000-$196,000 before school fees. | costs |
| Glendale, CA | Yes - the Standard Accessory Dwelling Unit Plan Program (Pre-Approved ADU Program) lists 1 approved plan (1-story, 740 sq ft, 1 bed/1 bath), designed and sold by a private firm; Standard Plans 2 and 3 are listed as 'coming soon'. Program contact (818) 937-8139. | costs |
| Hayward, CA | Yes. Hayward's ADU Plans Gallery (hayward.aduaccelerator.org) lists designer plan sets pre-reviewed by the city; the plans are purchased from the designer, not free, and still need a site-specific site plan, foundation details and the ADU checklist | costs |
| Huntington Beach, CA | Yes: one free pre-approved plan under AB 1332 (Gov. Code 65852.27), a one-story 490 sq ft detached one-bedroom, one-bath ADU offered in three exteriors (California Ranch, Bungalow, Spanish Colonial), with an optional 53 sq ft porch and optional solar. The plan cannot be modified; sprinklers are required only if the main house has them, and the owner must check for an oil well on or within 100 ft of the parcel (methane barrier if yes) | costs |
| Long Beach, CA | Yes, but paused. The Pre-Approved ADU (PAADU) Program (Building & Safety IB-068, rev. 1/27/2025) offers single-story, detached, all-electric standard plans under 1,200 sq ft for new construction only; a site-specific submittal is reviewed over the counter and the permit can issue the same day. The plan approvals previously listed (an 800 sq ft single-story design in four foundation and patio variants) expired December 31, 2025, and the city says the program is currently undergoing changes with no plan list published as of June 2026; check the PAADU page or email PlanCheck.Counter@longbeach.gov before choosing a plan | costs |
| Los Angeles, CA | Yes. LADBS's ADU Standard Plan Program listed 83 plans in its April 2026 list, 79 approved and 4 pending, from a 200 sq ft studio to 1,200 sq ft three-bedroom units, 8 of them two-story; one 455 sq ft one-bedroom plan is owned by the City and free to use, the rest are licensed from their designers. LADBS still reviews site-specific items (zoning, foundation) for each lot, and roof-deck plans may need extra setbacks in some zones | costs |
| Oakland, CA | Yes. 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 | costs |
| Pasadena, CA | Yes. As of August 2026 one free city Standard Plan compliant with the 2025 California Building Code is available citywide: Prototype A, a 374 sq ft studio. The five earlier plans (374-750 sq ft) expired Dec 31, 2025 and may only be used on properties red-tagged in the Eaton Fire. Plans cannot be modified, and a Hold Harmless Agreement is required. | costs |
| Riverside, CA | Yes. Dwell Riverside offers four free permit-ready detached single-story ADU plan sets prepared for the city: 746 sq ft (1 bed/1 bath), 800 sq ft (2 bed/2 bath), 1,020 sq ft (2 bed/2 bath) and 1,200 sq ft (3 bed/2 bath), each in Craftsman, Ranch or Spanish exteriors, with foundation options for all soil conditions and optional Very High Fire Hazard Severity Zone and noise-attenuation details. To qualify (ADU Express Eligibility Form, rev. Sept 2024) the lot must be single-family (R-1, RE, RR, RC or RA-5), outside a flood zone, outside the Cultural Resources overlay, outside a very high fire hazard severity zone (RMC 16.32.365) and meet the grading exemption; you sign a hold-harmless agreement and complete the T1.1 cover sheet. Presented to the City Council on December 10, 2024; the city had permitted 835 ADUs and JADUs from 2019 through September 2024 | costs |
| Roseville, CA | Yes — Preapproved ADU Plans program per AB 1332 (master plans preapproved for site-specific permit submittal) | costs |
| Sacramento, CA | Yes, two programs. 1) Shelf Ready ADU Plans: three free city-designed detached plans, all-electric and built to the 2022 Residential Code, updated December 2025: studio 367 sq ft, one-bedroom 559 sq ft, two-bedroom 747 sq ft. Mirroring is allowed, other changes are not, and you supply the site plan. All three stay under the 750 sq ft impact-fee threshold. 2) AB 1332 Preapproved ADU Program for third-party detached plans (Gov. Code 65852.27): the process exists but the city's catalog listed no plans as of September 19, 2026. Either route still needs site-specific zoning and building review | costs |
| San Bernardino, CA | Yes, 2 plans in the Pre-Selected ADU Plans Program: a 462 sq ft one-bedroom, one-bath detached unit and a 738 sq ft two-bedroom, two-bath detached unit, both drawn by a private structural engineering firm and purchased from the designer (the city holds no rights to them). They still go through Planning pre-approval, a hold-harmless agreement and Building & Safety plan check, and may not fit every lot or site condition; both are at or below 750 sq ft, so neither owes city impact fees, and the 738 sq ft plan owes school fees | costs |
| San Diego, CA | Yes. Under AB 1332 the city accepts three outside catalogs of pre-approved plans, the County of San Diego Standard ADU Plans, the City of Chula Vista Standard ADU Plans and the City of Encinitas Permit-Ready ADU Plans, with a 30-day review; the plans must be licensed from their designer and re-checked against current codes and the SDMC development standards (DSD ADU page; IB-400). Applicants may also have their own plans pre-approved for others through the master plan process in IB-114a; the city does not publish a count of such plans | costs |
| San Jose, CA | Yes. The Preapproved ADU program currently lists 7 city-reviewed standard plans from 5 vendors, 476-799 sq ft (1 bed/1 bath to 2 bed/2 bath); about 15 further plans from 7 vendors, 440-1,000 sq ft, are under review and not yet eligible. Applicants still submit a site-specific plan (siting, setbacks, utilities); a dedicated review team can issue the permit the same day as the plan review meeting when the site documents are complete (deferred structural submittals, clearances or variances take longer). Eligibility: a residential lot with an existing single-family home or duplex, outside geohazard, landslide, flood and Wildland-Urban Interface zones. Gov. Code 65852.27 governs pre-approved plan programs. | costs |
| San Mateo, CA | Yes. The city's ADU Plans Gallery (cityofsanmateo.aduaccelerator.org) listed 17 pre-approved designs in Sept 2026, from 340 to 1,110 sq ft: 2 studios, 4 one-bedroom, 10 two-bedroom and 1 three-bedroom; 16 prefab and 1 site-built. Using one unaltered costs the reduced $1,455.43 permit fee, but the lot must be residential, outside a high-hazard FEMA flood zone and WUI area, on a slope under about 15%, and free of easements and open code cases (Pre-Approved ADU Plans Guide) | costs |
| Santa Ana, CA | Yes. The city offers 10 free downloadable pre-approved plan sets for detached ADUs: three 399 sq ft studios (Ranch, Spanish, Traditional), three 499 sq ft one-bedrooms (Ranch, Spanish, Traditional), a 625 sq ft one-bedroom Contemporary, a 677 sq ft one-bedroom Craftsman and a 677 sq ft one-bedroom Spanish, and a 749 sq ft two-bedroom Contemporary; every set stays within the 750 sq ft impact-fee exemption. Planning review drops to $524. Eligibility: a lot with an existing or proposed single-family home, outside FEMA flood zones A and AE, outside the French Park (SD-19), Downtown and Floral Park historic districts and Heninger Park (SD-40), and able to meet the grading-permit exemption. Submit the site plan, completed cover sheet, application and affidavit, hold-harmless agreement, grading waiver and a six-month title report; the city asks for a pre-submittal consultation via planning@santa-ana.org | costs |
| Torrance, CA | Yes — City of Torrance Pre-Approved ADU Program through the Building & Safety Division | costs |
| Kansas City, MO | Yes: 7 free Pre-Approved Housing Master Plans including an 'ADU Over Garage' and a 'Tiny House'. You still submit a site plan and survey, pull each trade permit, and have a mechanical contractor design the HVAC (IB171). | costs |
| Albuquerque, NM | Yes: the Planning Department publishes four free casita construction plan sets (450, 550, 650 and 750 sq ft), each in flat-roof, pitched-roof and 3D-printable versions (12 files), drawn to the adopted building codes; still offered as of September 2026. Pitched-roof versions need truss drawings sealed by a New Mexico-licensed structural engineer. | costs |
| New York City, NY | Yes: DOB's OTCR list shows 8 pre-approved backyard ADU designs from 6 design firms (September 2026), reviewed by DOB for code and zoning and by FDNY for sprinklers, and browsable in HPD's ADU for You Plan Library; the design firm still files a site-specific job. | costs |
| Raleigh, NC | Yes: the ADU Fast Track gallery lists 12 plan sets (288-800 sq ft) pre-reviewed for NC Residential Code, sold by their designers for $400-$1,700; the plans cannot be modified, and site/zoning review still applies. | costs |
| Eugene, OR | Yes: the Pre-Approved ADU Plans Library has 11 detached plan sets from 287 to 795 sq ft (studio to 2 bedrooms). Ten are sold by their designers for $500 each; the city's own plan, The Joel, is a free download. All are pre-reviewed for building-code compliance, so the plan-review fee is not charged | costs |
| Portland, OR | Yes. The city offers 4 free pre-approved detached ADU plan sets (gable or shed roof, on a concrete slab or a wood-framed crawl space), adapted from the City of Eugene's plans. They are not suited to every lot: the shed-roof slab design exceeds the size allowed inside a side or rear setback, and the bathroom does not meet the visitability standard required when a lot has two ADUs. Truss packages can be a deferred submittal | costs |
| Salem, OR | Yes - one free City ready-build detached ADU plan set (under 600 sq ft) with a choice of slab or raised foundation and gable or shed roof, downloadable in English and Spanish; the City says it expedites building review. A gable roof needs a stamped truss package at submittal | costs |
| San Antonio, TX | Yes: 5 Casita Permit-Ready Plans (375, 490, 675, 794 and 800 sq ft), reviewed and approved by DSD as complete building plans; $450 base fee paid to the designer, site-specific changes priced separately; owners at or below 80% AMI can get up to $4,500 design-fee reimbursement | costs |
| Kirkland, WA | Yes. The city's Pre-Approved Detached ADU Plans gallery lists four registered plan families from three local design firms, from a 476-636 sq ft one- or two-bedroom cottage to 1,000-1,132 sq ft two- and three-bedroom units, including a single-level no-stairs layout and mirrored versions. You license the plan from its designer (up to $1,000), staff attach the registered set to your permit so you submit no construction drawings, and a qualifying site gets expedited review. Custom plans remain allowed. | costs |
| Seattle, WA | Yes. The City's ADUniverse gallery lists 7 pre-approved DADU designs (10 floor plans, 288 to 1,000 sq ft, studio to 3 bedrooms). Using one gets a permit in 2-6 weeks on most sites and a reduced plan-review fee, but only on a Neighborhood Residential lot with no environmentally critical area and under 750 sq ft of ground disturbance (SDCI help article, May 2026). ADUniverse 2.0 selected 15 new ADU and middle-housing designs from 110 submissions in 2026; the City expects them to be available from January 2027 | costs |
| Tacoma, WA | Yes. Four City pre-approved DADU base models: Unit A 300 sq ft studio; Unit B 520 sq ft one-bedroom; Unit C 845 sq ft two-bedroom over a 647 sq ft garage; Unit D stacked duplex of two 534 sq ft one-bedrooms (counts as two ADUs). Each comes in two roof styles with siding options and meets Home In Tacoma standards. The plan sets, site evaluation and staff site visit are free; permit fees and a site-specific review still apply. | costs |
| City | Status | More |
|---|---|---|
| Mesa, AZ | Mesa's Preapproved Housing Design Plan Program (per the city, under ARS 9-461.19; the plan classes match ARS 9-461.20) accepts Class 4 ADU plans of exactly 200, 600 or 1,000 sq ft, with no review fee and standard permit fees at issuance; users sign a plan agreement and may need site-specific sheets. As of September 2026 the program page lists the classes but posts no ADU plans to choose from, so email PermitServices@mesaaz.gov for what is available; state law required at least three ADU plans from July 1, 2026. | costs |
| Phoenix, AZ | In progress. The city's ADU Standard Plan Library, built from the 2024 City of Phoenix / AIA Phoenix Metro design competition, listed four detached designs marked 'in review' on the city ADU page in May 2026; approved plans are free to Phoenix residents, must be used without modification and still need a plot/site plan. State law (ARS 9-461.20, from SB 1529 of 2025) requires Phoenix to offer at least three pre-approved ADU plans at 200, 600 and 1,000 sq ft from July 1, 2026 and to accept outside plan submissions; check the city ADU page for the current list | costs |
| Carlsbad, CA | Program exists but plans are offline: the ADU Permit Ready Program offers free pre-approved single-story detached plans in 4 floor plans (studio to 3-bedroom) and 3 styles (Spanish, Farmhouse, Modern), yet the city page says the sets are being updated to the 2025 California Building Codes and are 'currently unavailable' (expected summer 2026; still unavailable Sept. 2026). Using them unmodified saves design fees the city estimates at $8,000-$16,000 (Checklist B-75). | costs |
| El Cajon, CA | El Cajon has produced pre-approved ADU plans per local industry sources, but most posted plans region-wide need 2025 code-cycle updates — confirm availability with the Planning Division | costs |
| Irvine, CA | Program page exists (AB 1332 pre-approved-plans program) but lists no plans: "Coming soon" as of Sept 20, 2026. The city is recruiting design firms (CDAC@cityofirvine.org); any plan used still gets a site-specific review | costs |
| Oceanside, CA | The city runs a Pre-Approved ADU Program (AB 1332) but its plan library is empty: the program page says no vendor has yet submitted a plan for review. Once plans are listed, a permit using a pre-reviewed plan is approved within 30 days; the applicant still submits a site-specific plan. Page: Development Services > Building > Pre-Approved ADU Program. | costs |
| Ontario, CA | Ontario has no city-drawn standard ADU plan. Under its AB 1332 program, private designers may have non-site-specific detached ADU plans pre-approved for the current Building Code cycle, and a homeowner who submits such a plan unchanged gets a 30-day plan check. As of Sept. 2026 the City's vendor list still reads 'COMING SOON', so no pre-approved plans are actually available (Preapproved ADUs page, ontarioca.gov). | costs |
| Rancho Cucamonga, CA | Program exists on paper: the city's AB 1332 page describes plan pre-approval and the FY2026-27 fee schedule sets a $1,363 permit fee for a 'Pre-Approved ADU Plan' up to 1,200 sq ft, but no pre-approved plans are posted on the city website as of Sept 2026. Ask Building & Safety (EDRnotification@CityofRC.us) whether any plan has been pre-approved; AB 1332 requires a 30-day decision on a detached ADU that uses one. | costs |
| San Francisco, CA | DBI runs a Pre-approved ADU Plans program in which building designers submit detached-ADU designs for a $2,408 flat review fee; approved designs are meant to be posted on DBI's site for owners to choose and have the designer adapt to their lot. As of September 19, 2026 DBI's page lists no approved designs. Pre-approved plans are drawn for 25-ft lots, are valid only for the current code cycle, cannot be used in slope-protection, landslide, liquefaction, Maher or flood zones, and still need site-specific plan check of Planning Code compliance, soils, fire separation, foundation and SFUSD fees; a separate tolling form applies to permits that use a pre-approved plan | costs |
| Santa Monica, CA | Preapproved ADU Program under Gov. Code 65852.27 (AB 1332) accepts vendor-submitted Standard ADU Plans for detached ADUs only, with no modifications allowed; as of Sept 2026 the city lists no approved plans ('NONE AT THIS TIME') | costs |
| Upland, CA | The city's Building & Safety Division publishes a Pre-approved ADU Plans page (last read July 2026); the number of plans, sizes and any plan fee could not be re-verified on Sept 20, 2026 because the city website was unreachable. A site-specific plot plan is still required. Confirm current availability with Building & Safety, (909) 931-4110. | costs |
| Newton, MA | Coming: the city's Backyard Blueprints competition (AARP Community Challenge grant) is collecting permit-ready detached ADU designs until Oct 19, 2026, with a public vote in November and a gallery of pre-reviewed plans sold at a flat designer fee due mid-December 2026 (Planning page, updated Sept 16, 2026). No plans are available yet. | costs |
| Bend, OR | 1 free pre-approved plan set (shed or gable roof), developed by the City of Eugene and offered by Bend at no cost; the plans cannot be modified and you still pay permit fees and SDCs. The City says more plans are planned. | costs |
| Houston, TX | ADU|HOU program: one free permit-ready plan set (the 'Double-House' design-competition winner, with preliminary Houston Public Works approval), a design book of 26 schematic designs, and three workshop videos. The program's web home (letstalkhouston.org/adu) no longer serves city content as of Sept 2026 — request the files from Planning & Development (832-393-6624). | costs |
| Salt Lake City, UT | Five pre-approved standard plans on the Building Services ADU page (checked Sept 2026): a 650 sq ft 1-bedroom, a 775 sq ft 2-bedroom, an 800 sq ft 2-bedroom, a detached-garage conversion and a second-storey garage conversion, all drawn by private firms. A site review is still required for the permit and all fees still apply. The Planning Division's ADU Handbook (v2.2) is the zoning guide. | costs |
Birmingham, AL, Huntsville, AL, Mobile, AL, Avondale, AZ, Chandler, AZ, Gilbert, AZ, Goodyear, AZ, Paradise Valley, AZ, Peoria, AZ, Scottsdale, AZ, Surprise, AZ, Corona, CA, Folsom, CA, Rancho Cordova, CA, Boulder, CO, Colorado Springs, CO, Denver, CO, Washington, DC, Jacksonville, FL, Miami, FL, Orlando, FL, Tampa, FL, Atlanta, GA, Savannah, GA, Honolulu, HI, Chicago, IL, Evanston, IL, Boston, MA, Cambridge, MA, Medford, MA, Quincy, MA, Somerville, MA, Waltham, MA, Worcester, MA, Ann Arbor, MI, Detroit, MI, Grand Rapids, MI, Minneapolis, MN, Saint Paul, MN, Henderson, NV, Las Vegas, NV, North Las Vegas, NV, Jersey City, NJ, Montclair, NJ, Princeton, NJ, Trenton, NJ, Buffalo, NY, Rochester, NY, Charlotte, NC, Durham, NC, Beaverton, OR, Pittsburgh, PA, Charleston, SC, Nashville, TN, Austin, TX, Dallas, TX, Fort Worth, TX, Frisco, TX, Plano, TX, Richardson, TX, Alexandria, VA, Arlington, VA, Bellevue, WA, Bothell, WA, Redmond, WA, Sammamish, WA, Spokane, WA, Vancouver, WA, Woodinville, WA. In these cities, budget for custom architectural plans (typically $3,000–$15,000) — see each city's cost guide for the full picture.
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