ADU Builders in Sacramento, CA (2026)

ADU builders in Sacramento typically quote $100,000-$250,000 for a new detached unit, or about $150-$300 per square foot, including design, permitting, and construction. A garage conversion runs $60,000-$140,000 and a prefab/modular ADU averages $80,000-$200,000. Add city permit and plan-review fees (Replace the guessed range with the city's OWN published figures. Form CDD-0419, 'Accessory Dwelling Unit (ADU) Fee Estimate (New Construction)', revised 07-12-2026, at a $170.80/sq ft valuation: 749 sq ft = $5,271.90 total; 750 sq ft = $10,624.40; 1,200 sq ft = $14,842.50. Representative line items at 1,200 sq ft: building permit $1,790.36, building plan review $751.95, fire dept administrative $176, fire inspection $294 ($0.11/sq ft, $294 minimum), fire plan review $260, planning inspection $526, planning review $263, public works review $205 deposit + hourly, utilities $205 deposit + hourly, construction excise tax $945.60, general plan fee $533 ($2.60 per $1,000 valuation), residential construction tax $315, technology fee $254.23. NOT included and additional: school district impact fees (calculated and collected by the district, form CDD-0226), Regional Sanitation and Sewer Development fees (the form says 'Check with County'), and possible sewer/water tap, housing and project-area impact fees. The optional ADU Zoning Review is now $0 (the $117 fee was waived). An optional building permit fee estimate service costs $164 (form CDD-0278). Additional review time bills at $216/hr building, $263/hr planning. The city's own caveat: 'This is only an estimate. The actual fees can vary based on project scope, location, fee changes, etc.') plus impact fees of Substantively correct — keep the state-law framing, but attach the city's actual dollar figures, which is where the value is. From CDD-0419: at 749 sq ft every impact fee line reads '-' (zero). At 750 sq ft they switch on: Park Development Impact Fee $2,617.50, SAFCA (Sacramento Area Flood Control Agency) Development Impact Fee $1,575.00, Sacramento Transportation Authority mitigation + 2% admin $1,154.64. At 1,200 sq ft: $4,188.00 / $2,520.00 / $1,415.76. Citywide Transportation Development Impact Fee shows as zero at all three sizes. School district impact fees apply at ANY size and are paid directly to the district. Net: crossing 750 sq ft adds roughly $5,347 in one step. The form flags that SAFCA/park/STA fees 'May be lower in certain infill areas or incentive zones'. IMPORTANT NEGATIVE FINDING: the City page titled 'reduction-of-development-impact-fees-for-new-adus' is NOT an ADU waiver — I read it, and it reduces certain impact fees to zero only for deed-restricted affordable dwelling units (30-year affordability, agency confirmation required, subject to funding availability). Do not write it up as an ADU incentive.. Quotes for the same scope commonly vary 20-40% between builders, so collect at least three bids.

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.

Most full-service ADU builders manage the permit process for you. In Sacramento the approval process is "Ministerial — correct, and worth expanding because the sequencing is a real-world stumbling block. 17.228.105(B)(4)(a) requires the city to ministerially review all ADU/JADU applications. Per the Building Division's own handout (CDD-0423, rev. 01-29-2026), planning approval must be obtained BEFORE a building permit application is filed, unless the applicant secures an approved Memorandum of Understanding for concurrent plan review from senior Planning staff. Plans may be filed via electronic plan check. A free optional ADU Zoning Review is offered as a pre-check against the Planning and Development Code. A separate address is required for each ADU. Deviations from the local development standards are available, but only via discretionary site plan and design review under Ch. 17.808 (17.228.105(B)(5)) — that route is NOT ministerial. Useful cost note from the same handout: a detached ADU is exempt from fire sprinklers if the main house is unsprinklered and the ADU (excluding garage) does not exceed 1,200 sq ft." with a typical review timeline of 60 days — correct, and this is genuinely in the CITY's code, not merely restated state law, which is worth saying. Two conditions our record omits: (1) the 60 days runs from a COMPLETE application and only where there is an existing residential use on the lot; (2) if the ADU is filed alongside an application for new residential development, the city may defer the ADU decision until the primary is approved, and the clock tolls for any applicant-requested delay. Deemed-approved remedy is in the code text. Separately, AB 1332 preapproved plans carry a 30-day approval — but see pre_approved_plans, the city's AB 1332 catalog is currently empty, so no homeowner can actually use that 30-day path today.. Confirm in writing whether permit fees, plan check (Standard review), and impact fees are included in the bid or billed separately.

Plan for the permit review (60 days — correct, and this is genuinely in the CITY's code, not merely restated state law, which is worth saying. Two conditions our record omits: (1) the 60 days runs from a COMPLETE application and only where there is an existing residential use on the lot; (2) if the ADU is filed alongside an application for new residential development, the city may defer the ADU decision until the primary is approved, and the clock tolls for any applicant-requested delay. Deemed-approved remedy is in the code text. Separately, AB 1332 preapproved plans carry a 30-day approval — but see pre_approved_plans, the city's AB 1332 catalog is currently empty, so no homeowner can actually use that 30-day path today. 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.