Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Rancho Cordova ADU cost →Building an ADU in Rancho Cordova costs between $170,000-$400,000 for new construction, with per-square-foot costs averaging $250-$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 | No published ADU permit fee. Rancho Cordova gives Building Permit and Development fee estimates on request by email to PermitServices@CityofRanchoCordova.org with the proposed square footage; no fee schedule appears on the ADU FAQ or the Building and Safety pages (checked 2026-09-20). |
| Impact Fees | None on an ADU of 750 sq ft or less, or a JADU of 500 sq ft or less: Gov. Code 66311.5(c)(1), effective January 1, 2026, binds the city, special districts and water corporations alike. Above 750 sq ft, city impact fees are charged in proportion to the primary dwelling's square footage (city ADU FAQ, which still carries the pre-2026 wording that put the line just short of 750). Utility connection fees and capacity charges are not impact fees and may still be charged, proportionately, for a new detached unit (66311.5(b)-(c)(2)). The FAQ lists Sacramento Area Sewer District (916-876-6100), Sacramento County Water Agency (916-874-6851), SMUD (916-732-5700), Golden State Water (1-800-999-4033), California American Water (916-568-4251) and Sacramento Metro Fire District (916-859-4330) as the agencies to contact. School district developer fees are collected separately; the city's form RCB0901 is the certificate of compliance, and the rate comes from the district, not the city. |
| 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 Rancho Cordova, where we have them — free, no obligation.
Get Rancho Cordova builder quotes →Permit fees in Rancho Cordova are No published ADU permit fee. Rancho Cordova gives Building Permit and Development fee estimates on request by email to PermitServices@CityofRanchoCordova.org with the proposed square footage; no fee schedule appears on the ADU FAQ or the Building and Safety pages (checked 2026-09-20).. The review timeline is City estimate (Residential Review Timelines, Rev. 08/18/2026): ADU/JADU planning review 10 business days, building plan check 15 (10 per re-check), 10 to issue: about 35 business days on a clean pass. State law: 60 days from a complete application or the ADU is deemed approved (Gov. Code 66317)., with plan check: Building plan check follows Planning approval (city timeline sheet: 15 business days first cycle, 10 per subsequent cycle). Fire sprinklers are required in a newly built ADU only where the existing primary dwelling has an automatic residential sprinkler system, and a house built before sprinklers were required does not have to add one to take an attached ADU (city ADU FAQ; Gov. Code 66314(d)(12)). The ADU may need photovoltaic panels under the California Energy Code (FAQ). Projects in the American River Parkway or a FEMA flood zone add five business days per review cycle; expedited review can be requested on form RCB1202 (timeline sheet, notes 4 and 5).. Impact fees are None on an ADU of 750 sq ft or less, or a JADU of 500 sq ft or less: Gov. Code 66311.5(c)(1), effective January 1, 2026, binds the city, special districts and water corporations alike. Above 750 sq ft, city impact fees are charged in proportion to the primary dwelling's square footage (city ADU FAQ, which still carries the pre-2026 wording that put the line just short of 750). Utility connection fees and capacity charges are not impact fees and may still be charged, proportionately, for a new detached unit (66311.5(b)-(c)(2)). The FAQ lists Sacramento Area Sewer District (916-876-6100), Sacramento County Water Agency (916-874-6851), SMUD (916-732-5700), Golden State Water (1-800-999-4033), California American Water (916-568-4251) and Sacramento Metro Fire District (916-859-4330) as the agencies to contact. School district developer fees are collected separately; the city's form RCB0901 is the certificate of compliance, and the rate comes from the district, not the city.. Pre-approved plans: None published. The Planning Division document library and the Building and Safety forms page list no pre-approved or permit-ready ADU plan gallery (checked 2026-09-20), so every ADU needs a full plan set. Gov. Code 65852.27 required every local agency to have a program for pre-approving applicant-submitted ADU plans by January 1, 2025; ask Planning at (916) 851-8750 whether any plans have been pre-approved under it..
| 1-Bedroom Rent | $1,400-$1,800/month |
| 2-Bedroom Rent | $1,800-$2,200/month |
| Annual Rental Income (est.) | $19,200/year |
| Payback Period (est.) | 14.8 years |
| Short-Term Rental | No. The ADU may be rented only for a term longer than 30 days (city ADU FAQ), the one rental condition state law lets a city impose (Gov. Code 66315) and one that 66323(e) requires for units built under the state route. |
| Overall ROI Estimate | 5-10% gross annual return on a detached build; 8-20% on a garage conversion |
A typical ADU in Rancho Cordova generates approximately $19,200 per year in rental income based on average 1-bedroom rents. At an average construction cost of $285,000, the estimated payback period is 14.8 years — before accounting for the resale value the ADU adds, which an appraiser determines from comparable sales in Rancho Cordova 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 Rancho Cordova: $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 Rancho Cordova, 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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