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 $155,000-$310,000 for new construction, with per-square-foot costs averaging $250-$410. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $80,000-$155,000, while prefab/modular ADUs fall in between at $120,000-$255,000.
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | Confirm current building permit and plan check amounts with Rancho Cordova Building and Safety at (916) 851-8760 — the City publishes a Building Permit Fee Estimates tool rather than a flat ADU fee, and no ADU-specific fee schedule appears in its ADU material |
| Impact Fees | None at all below 750 sq ft. "No city-imposed impact fees shall be charged for an accessory dwelling unit that is less than 750 square feet in size. For accessory dwelling units 750 square feet or larger, city-imposed impact fees shall be charged proportionately in relation to the square footage of the primary dwelling" (City of Rancho Cordova ADU FAQ, Planning Department). That is the single largest cost lever on a Rancho Cordova ADU: a 749 sq ft unit and a 760 sq ft unit are not 11 square feet apart on the fee bill. School district and utility district fees are separate — the City's ADU 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 |
| 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. Get up to 5 free quotes from ADU builders serving Rancho Cordova — no obligation.
Get Rancho Cordova builder quotes →Permit fees in Rancho Cordova are Confirm current building permit and plan check amounts with Rancho Cordova Building and Safety at (916) 851-8760 — the City publishes a Building Permit Fee Estimates tool rather than a flat ADU fee, and no ADU-specific fee schedule appears in its ADU material. The review timeline is The permitting agency must determine whether the application is complete and give written notice within 15 business days, and must approve or deny within 60 days of receiving a complete application where there is already a single-family or multifamily dwelling on the lot (Gov. Code §66317(a)(2)-(3)). If it misses the completeness deadline, the application is deemed complete. Where the ADU application is filed together with an application for a new primary dwelling, the agency may hold the ADU decision until it decides the primary. The City publishes an Estimated Project Review Timelines sheet for residential permits — ask Building and Safety at (916) 851-8760 for the current version, with plan check: Building Division plan check as part of the building permit. Fire sprinklers are required in a newly built ADU only where the existing primary dwelling has an automatic residential sprinkler system; a dwelling built before sprinklers were required does not have to add one to take an attached ADU (City of Rancho Cordova ADU FAQ), which tracks Gov. Code §66314(d)(12) — an ADU may not be required to provide fire sprinklers if they are not required for the primary residence, and building an ADU may not trigger sprinklers in the existing house. The ADU structure may require photovoltaic panels under the California Energy Code. Construction of an ADU does not by itself constitute a Group R occupancy change under the local building code unless the building official makes a written finding on substantial evidence of a specific adverse impact on public health and safety (Gov. Code §66314(d)(8)). Impact fees are None at all below 750 sq ft. "No city-imposed impact fees shall be charged for an accessory dwelling unit that is less than 750 square feet in size. For accessory dwelling units 750 square feet or larger, city-imposed impact fees shall be charged proportionately in relation to the square footage of the primary dwelling" (City of Rancho Cordova ADU FAQ, Planning Department). That is the single largest cost lever on a Rancho Cordova ADU: a 749 sq ft unit and a 760 sq ft unit are not 11 square feet apart on the fee bill. School district and utility district fees are separate — the City's ADU 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. Pre-approved plans: None found in a City of Rancho Cordova source as of September 1, 2026 — the City's ADU FAQ and Planning Division document library list no preapproved or permit-ready ADU plan programme, unlike neighbouring Citrus Heights, which gives its plans away free. Confirm with Rancho Cordova Planning at (916) 851-8750 before commissioning a full custom set.
| 1-Bedroom Rent | $1,500-$1,850/month |
| 2-Bedroom Rent | $1,800-$2,250/month |
| Annual Rental Income (est.) | $20,100/year |
| Payback Period (est.) | 11.6 years |
| Short-Term Rental | No. "The ADU can only be rented for a period longer than 30 days" (City of Rancho Cordova ADU FAQ), which is the one rental condition California still lets a city impose (Gov. Code §66315), and which Gov. Code §66323(e) requires for any unit created under the state ministerial pathway. Airbnb-style letting of the ADU is out; a 31-day-plus tenancy is the shortest lawful term. Separately, the ADU generally cannot be sold or conveyed apart from the primary dwelling (Gov. Code §66314(d)(1); see the narrow exception in Article 4, Gov. Code §§66340-66342) |
| Overall ROI Estimate | 6-9% annual return |
A typical ADU in Rancho Cordova generates approximately $20,100 per year in rental income based on average 1-bedroom rents. At an average construction cost of $232,500, the estimated payback period is 11.6 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: $80,000-$155,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $120,000-$255,000.
3. Pre-approved plans — Rancho Cordova does not offer a pre-approved/standard ADU plan program yet, so budget for custom architectural plans (typically $3,000-$15,000). 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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