ADU Construction projects in Daly City reflect the realities of the Bay Area / San Mateo County construction market: skilled-labour rates, permit fees, and material costs that sit above the national average. ADU costs in the Bay Area are among the highest in the country, driven by land costs, permit fees, and labor. That said, the rental income potential consistently exceeds the carrying cost of a construction loan — making most Bay Area ADU projects financially sound.
Cost Ranges for ADU Construction in Daly City
The following ranges reflect current pricing for Daly City and the wider Bay Area / San Mateo County area:
- JADU (Junior ADU, within existing space): $32,000–$80,000
- Garage conversion (full ADU): $96,000–$176,000
- Attached ADU addition: $128,000–$240,000
- Detached ADU (500–800 sq ft): $144,000–$256,000
- Detached ADU (800–1,200 sq ft): $208,000–$360,000
- ADU design and permits (no construction): $12,000–$32,000
Labour and Market Costs in Daly City
Licensed tradespeople in the Bay Area — plumbers, electricians, tile setters, carpenters — work in one of the highest labour markets in the country, typically billing $100–$140 per hour.
Key Factors That Affect Your Price
- Unit size — every additional square foot adds cost
- Foundation type — slab vs. crawl space vs. basement
- Utility connections — new meter, sewer lateral, and gas connections
- Finishes — kitchen appliances, flooring, tile quality
- Site conditions — slope, access, tree removal
- Plan check fees — San Francisco charges among the highest in the state
Permit Requirements
Many adu construction scopes in Daly City require permits through the Daly City Building Division. Permit fees typically add $500–$3,000 to a project’s total. A licensed contractor should pull all required permits — if a contractor suggests skipping permits on significant work, that is a red flag.
Getting an Accurate Estimate
IronNest Construction does not take on this trade and does not bid it — we are a Class B general builder and we only quote work we carry insurance for. Use the ranges above to judge the quotes you do get: insist on a written, fixed-scope estimate after an in-person assessment, and treat a price given over the phone as a guess rather than a bid.
What Daly City Conditions Mean for ADU Construction
Daly City sits in the Bay Area / San Mateo County, which means persistent fog, salt air and wind-driven rain, so surfaces rarely get a long dry spell. Salt carried in on the fog is the part people underestimate: it attacks fasteners and finishes on the seaward side long before the sheltered side shows anything.
Daly City is one of the foggiest municipalities in California. Exterior materials must handle persistent moisture — we specify accordingly for every project here.
ADU Construction Permits and Inspections in Daly City
Daly City permits run through the city's Building Division. Many homes share similar plans, which makes the scope easier to define and the inspections more predictable.
Every ADU and addition needs a building permit, structural engineering and Title 24 energy compliance. State law requires the city to decide a complete ADU application within 60 days and waives impact fees on units under 750 square feet. We prepare the submittal, answer plan-check comments, coordinate utility connections and meet the inspector at each stage.
Where We Work in Daly City
We take adu construction work across Daly City, including Westlake, Serramonte, Crocker, St. Francis Heights, Vista Grande, Mission Hills, Bayshore. Travel inside the city is included in the quoted price.
Daly City at a Glance
Daly City is dense, foggy, and built mostly in the postwar era — lots of stucco-clad homes on small lots. It's right on the border of San Francisco, shares similar weather, and has its own permitting department. The housing is aging, which means there's real renovation work here: outdated kitchens, tired bathrooms, and failing siding that\'s overdue for replacement.
- Area: Bay Area / San Mateo County (ZIP 94014)
- Served from: our San Francisco branch, (415) 770-4977
- Typical Daly City work: Daly City Building Department permits — handled in-house; Full kitchen and bathroom renovations on compact floor plans; Drywall repair and texture matching on older plaster
