California Remodel Cost vs. Value › Projects
Caissonix report · 2026 · 13 California cities
Does Adding a Bathroom Add Value in California?
In San Francisco, homes with one more full bathroom sold for about $78,000 more (range $47,000–$110,000) than otherwise similar homes of the same size, in our analysis of 2,362 single-family sales on the Assessor-Recorder roll.
Our estimator does not price this project yet, so the cost side is blank for now. Our engine prices additions of 150 sq ft and up, so a bathroom-only cost is coming.
Not an appraisal, a broker price opinion or a prediction of a sale price. Costs are budget estimates, not a bid, appraisal, or insurance claim valuation. Pilot.
The project we priced
Add a bathroom. Add one full bathroom to a home. Our engine prices additions of 150 sq ft and up, so a bathroom-only job is not priced yet.
Same scope in every city. Your own home, size and finish choices will differ.
Resale value: what we can verify
| City | Value added | Range | Likely cost | Value ÷ cost | Confidence |
|---|---|---|---|---|---|
| San Francisco | $78,000 | $47,000–$110,000 | — | — | Low |
Source: Caissonix analysis of the San Francisco Assessor-Recorder secured roll, roll years 2023 and 2024. https://data.sfgov.org/d/wv5m-vpq2
Other cities (Oakland, San Jose, Los Angeles, Long Beach, Irvine, San Diego, Sacramento, Riverside, San Bernardino, Fresno, Bakersfield, Stockton): no value figure yet. We do not stretch one city's result to another.
Questions
Does Adding a Bathroom Add Value in California?
In San Francisco, homes with one more full bathroom sold for about $78,000 more (range $47,000–$110,000) than otherwise similar homes of the same size, in our analysis of 2,362 single-family sales on the Assessor-Recorder roll.
Is this an appraisal?
No. It is an informational report: budget cost estimates plus the resale value evidence we can verify from public records and published studies. It is not an appraisal, a broker price opinion or a prediction of what your home will sell for. For a valuation, ask a licensed appraiser or a local real estate professional.
Caissonix California Remodel Cost vs. Value, 2026 pilot edition. Cost figures computed 2026-10-31 from engine 0.10.0, price book 2026-10-31.1. Not an appraisal, a broker price opinion or a prediction of a sale price. Costs are budget estimates, not a bid, appraisal, or insurance claim valuation. Get licensed contractor bids before you decide.