Home / Service Areas / San Mateo
ADU & new-home builds in San Mateo.
Independent construction project management for San Mateo homeowners — competitively bid, tracked in real time, and delivered for up to 10% less than your best builder offer.
Last updated: June 2026
Local know-how, on your side.
On the Peninsula, San Mateo blends a mix of lot sizes and a strong housing market, so both detached ADUs and conversions are common. High property values make permitted square footage especially worthwhile here.
Permitting in San Mateo: San Mateo reviews ADUs through its Planning Division under California ADU law. Peninsula lots vary widely, so the right unit type — detached, attached, or conversion — depends on the parcel, and early feasibility avoids costly redesigns.
Whatever your San Mateo lot allows, we scope it honestly, put the trades out to competitive bid, and manage the build from permit to keys — so you capture the value for up to 10% less than a markup contractor would charge.
Typical Bay Area ADU cost ranges.
General 2026 market estimates — your project is scoped and bid on its own.
A detached ADU generally runs $250K–$450K, a garage conversion $120K–$250K, and a junior ADU $75K–$150K — about $250–$450 per square foot. We competitively bid each trade and target a delivered cost up to 10% below your best builder offer. Full detail in our ADU cost guide.
Managed, not marked up — in San Mateo.
- Competitive trade bidding so you never overpay for San Mateo labor or materials.
- Real-time dashboard — budget, schedule, and quality, any time.
- One accountable manager from first estimate to final walkthrough.
- Local permitting know-how to keep your San Mateo project moving.
San Mateo ADU FAQ.
Detached or conversion in San Mateo?
It depends on your lot. Larger San Mateo parcels suit detached units; tighter lots or budgets often favor a garage conversion or JADU. We scope both.
Is an ADU worth it in San Mateo?
With Peninsula property values, permitted ADU square footage typically adds strong value and rental potential — two of the main reasons owners here build.
Building in San Mateo?
Send us your lot details and any bid you've received. We'll show you what's possible — and what you'd save.
Get a Free Estimate