How Much Does an ADU Cost in Anaheim, CA?

Construction Cost Breakdown

Building an ADU in Anaheim costs between $130,000-$290,000 for new construction, with per-square-foot costs averaging $195-$350. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $75,000-$165,000, while prefab/modular ADUs fall in between at $100,000-$235,000.

Permit Costs & Timeline

Permit fees in Anaheim are $3,500-$12,000. The review timeline is '60 days' alone is incomplete. The code sets a two-stage clock: the city must determine whether the application is complete within 15 BUSINESS days, and every resubmittal is subject to the same 15-business-day review period; once deemed complete, the permit must be approved or denied within 60 days. Where the ADU application is filed together with an application for a new primary dwelling, the city may defer the ADU decision until the primary is decided. Separately, via ADU Express the city advertises the review completed in 1-3 days with the building permit issued in as little as one day — but be honest that the city also says the eligibility screening beforehand 'can take a few weeks to complete'., with plan check: Standard city review. Impact fees are The state-law statement is correct and should stay, but it is a restatement of state law, not an Anaheim fact, and it omits the part that actually costs homeowners money. Verified from the city's own ADU Express process page: the Building Division quotes applicable development impact fees AND school district fees, and all fees must be paid before the building permit is issued — the applicant physically pays the school district and returns before the permit issues. Anaheim is served by SIX different school districts, so which district a property falls in determines the school fee. The city publishes separate 'Permit Impact Fees' and 'Developer Impact Fees' schedules. Dollar amounts remain UNVERIFIED for the same access reason as the fees field.. Pre-approved plans: Badly understated — this is the most commercially valuable fact on the page. Anaheim publishes a Pre-Approved Plan Catalogue of four detached ADU plans, each listed 'Free': Plan 001 studio, 224 sq ft; Plan 002 one bedroom / one bathroom, 499 sq ft; Plan 003 two bedroom / two bathroom, 990 sq ft; Plan 004 three bedroom / three bathroom, 1,199 sq ft. Plans include Building Code requirements effective 1 July 2024 and the city says it keeps adding plans. Two ways to use them: in the standard review process, or through ADU Express, an accelerated track for qualified single-family properties where the plans may NOT be modified. ADU Express steps include a free 400-amp multi-meter 'meter spot' from Anaheim Public Utilities (usually within three business days), an in-person site-plan meeting at City Hall, then payment of impact and school fees, after which the permit issues. Eligibility is checked by address through the city's ADU Express Eligibility Tool. Caveat to publish honestly: some catalogue plans still require the owner to hire a design professional for the site plan, Title 24, structural details and soils report..

Rental Income & ROI

A typical ADU in Anaheim generates approximately $24,000 per year in rental income based on average 1-bedroom rents. At an average construction cost of $210,000, the estimated payback period is 8.8 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).

Ways to Reduce ADU Costs in Anaheim