Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Anaheim ADU cost →Building an ADU in Anaheim costs between $220,000-$450,000 for new construction, with per-square-foot costs averaging $300-$500. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $90,000-$200,000, while prefab/modular ADUs fall in between at $170,000-$340,000.
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | Building Permit Fees schedule (Exhibit A, Tier 3 Type VB, Residential Category 1, Dwellings and Custom; posted Aug 2026): combined plan check and building permit of $1,677 for the first 500 sq ft plus $213 per extra 100 sq ft up to 1,000 sq ft (about $2,316 for an 800 sq ft ADU), then $2,741 at 1,001 sq ft plus $171 per 100 sq ft (about $3,083 for 1,200 sq ft). Add trade permits (electrical $26 for the first 100 sq ft plus $0.26 per sq ft; plumbing $49 per fixture; $188 minimum per trade permit), Zoning Plan Check $352 and a $114 address fee (Planning fee schedule, Aug 2025). Budget roughly $3,000-$4,500 in city fees for an 800-1,200 sq ft detached ADU before impact and school fees |
| Impact Fees | None on an ADU of 750 sq ft or less; a larger ADU pays impact fees in proportion to the main house's floor area (state ADU law, Gov. Code 66311.5). For a full single-family unit Anaheim's Public Works schedule effective Aug 24, 2026 lists a Transportation Impact and Improvement Fee of $2,029 and a sewer impact fee of $356-$2,235 depending on the sewer zone (West or Central Anaheim) or $667 in East Anaheim; park and storm-drain fees apply where the city's schedules require. School district developer fees are separate: the Building Division tells you which of Anaheim's six school districts to pay, and you pay the district directly before the permit issues (ADU Express page). Impact fees can be deferred to final inspection under the city's Fee Deferral Program |
| Site Prep & Foundation | $10,000 – $35,000 |
| Framing & Structure | $15,000 – $45,000 |
| Plumbing | $8,000 – $20,000 |
| Electrical | $5,000 – $15,000 |
| HVAC | $3,000 – $8,000 |
| Interior Finishes | $15,000 – $40,000 |
Quotes for the same ADU commonly vary 20–40% between builders. We pass your request to up to 5 local builders serving Anaheim, where we have them — free, no obligation.
Get Anaheim builder quotes →Permit fees in Anaheim are Building Permit Fees schedule (Exhibit A, Tier 3 Type VB, Residential Category 1, Dwellings and Custom; posted Aug 2026): combined plan check and building permit of $1,677 for the first 500 sq ft plus $213 per extra 100 sq ft up to 1,000 sq ft (about $2,316 for an 800 sq ft ADU), then $2,741 at 1,001 sq ft plus $171 per 100 sq ft (about $3,083 for 1,200 sq ft). Add trade permits (electrical $26 for the first 100 sq ft plus $0.26 per sq ft; plumbing $49 per fixture; $188 minimum per trade permit), Zoning Plan Check $352 and a $114 address fee (Planning fee schedule, Aug 2025). Budget roughly $3,000-$4,500 in city fees for an 800-1,200 sq ft detached ADU before impact and school fees. The review timeline is The city must tell you within 15 business days whether the application is complete, each resubmittal gets the same 15-business-day check, and a complete application must be approved or denied within 60 days (18.38.015.1502 to .1504); under Gov. Code 66317(a)(3) as amended by SB 543 (Jan 1, 2026) an application not acted on in 60 days is deemed approved. If the ADU is filed with a permit for a new house, the ADU decision may wait for that permit. ADU Express: review in one to three days and the building permit issued in as little as one day after fees are paid, but the address-eligibility screening beforehand can take a few weeks (city ADU Express and catalogue pages). The Building Division publishes no standard plan-check turnaround, with plan check: Planning reviews zoning compliance inside the Building Division's plan check; plans must meet the 2025 California Building, Residential, Electrical, Mechanical, Plumbing, Energy, Fire and Green Building codes with Anaheim's Title 15 amendments for submittals on or after Jan 1, 2026 (Seismic Design Category D-F, Climate Zone 8). Fire sprinklers are not required in the ADU or JADU if the main house has none (18.38.015.0602). Even a free pre-approved plan may still need a site plan, Title 24 energy forms, structural details and a soils report from a design professional; the catalogue's Notes column says which. Impact fees are None on an ADU of 750 sq ft or less; a larger ADU pays impact fees in proportion to the main house's floor area (state ADU law, Gov. Code 66311.5). For a full single-family unit Anaheim's Public Works schedule effective Aug 24, 2026 lists a Transportation Impact and Improvement Fee of $2,029 and a sewer impact fee of $356-$2,235 depending on the sewer zone (West or Central Anaheim) or $667 in East Anaheim; park and storm-drain fees apply where the city's schedules require. School district developer fees are separate: the Building Division tells you which of Anaheim's six school districts to pay, and you pay the district directly before the permit issues (ADU Express page). Impact fees can be deferred to final inspection under the city's Fee Deferral Program. Pre-approved plans: 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.
| 1-Bedroom Rent | $2,000-$2,700/month |
| 2-Bedroom Rent | $2,600-$3,200/month |
| Annual Rental Income (est.) | $28,200/year |
| Payback Period (est.) | 11.9 years |
| Short-Term Rental | No. Anaheim has not allowed any new short-term rental since its 2016 ban; the June 2019 update to AMC Chapter 4.05 keeps existing permitted STRs only, so an ADU cannot be listed for stays under 30 days. |
| Overall ROI Estimate | 6-10% gross rental yield on a $250,000-$400,000 detached build at $2,000-$2,700/mo (before taxes, vacancy and financing) |
A typical ADU in Anaheim generates approximately $28,200 per year in rental income based on average 1-bedroom rents. At an average construction cost of $335,000, the estimated payback period is 11.9 years — before accounting for the resale value the ADU adds, which an appraiser determines from comparable sales in Anaheim and varies by market (often less than build cost).
1. Garage conversions save 40-60% vs new construction since the shell already exists. Average cost in Anaheim: $90,000-$200,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $170,000-$340,000.
3. Pre-approved plans — available in Anaheim, which can save $3,000-$10,000 in design costs and 2-3 months in review time. See which cities offer pre-approved ADU plans.
4. State grants — California's CalHFA ADU grant (up to $40K) is currently paused; check calhfa.ca.gov/adu for status and your state for active programs.
5. Get multiple bids — ADU contractor pricing varies 20-40% for the same project. We recommend getting at least 3 quotes.
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