Garage Conversion Services — San Mateo

JADU & ADU garage conversions for San Mateo homeowners

Garage-to-JADU, garage-to-ADU, home office and in-law suite conversions in San Mateo — permitted, Title 24 compliant, and built for the city's mix of Craftsman-era and mid-century housing.

Get a Free Quote Call (408) 442-9136

Local Knowledge

Garage conversions built around San Mateo's varied housing stock

San Mateo has a broader mix of housing eras than a lot of its neighbors — older Craftsman and Spanish-style homes with modest, sometimes single-car garages sit not far from mid-century neighborhoods with more standard two-car structures. That range means the starting point for a conversion varies more from block to block here than in a city built out in a single wave. We confirm your specific home's era and garage dimensions during the site walk, since a plan that works for a mid-century two-car garage doesn't automatically fit an older, more compact structure.

Services in San Mateo

What we build for San Mateo homeowners

Garage-to-JADU Conversion

Convert your attached San Mateo garage into a Junior ADU within your home's existing footprint — simpler permitting, shared utilities, up to 500 sq ft.

Garage-to-ADU Conversion

A full accessory dwelling unit with independent utilities, built out from your existing attached or detached garage in San Mateo.

Garage-to-Home Office / Studio

A quiet, code-compliant workspace built into your San Mateo garage, without triggering dwelling-unit permitting.

Detached Garage Conversion

Standalone San Mateo garages converted into a backyard ADU, studio or guest unit, with new utility runs sized for the finished space.

Our Process

How a San Mateo garage conversion moves from design to final inspection

Design & Feasibility Review

We evaluate your San Mateo garage's slab, framing and ceiling height against what you want to build, and confirm your lot's setback and coverage rules.

Permits & Title 24 Compliance

We prepare and file your permit package with San Mateo's building department, including Title 24 energy calculations, and manage plan check corrections.

Construction & Rough-In

Framing, insulation, electrical, plumbing and HVAC rough-in built to the approved plans.

Final Inspection & Handoff

We schedule and walk through final inspection with San Mateo, then hand you a finished, permitted space.

Why San Mateo Homeowners Choose Us

San Mateo homeowners come to us because the city's housing spans several eras, and a garage conversion plan needs to match the actual structure on their lot, not a citywide average.

JADU & ADU permitting specialists

We know the difference between a JADU and an ADU cold, and scope your project to the one that actually fits your goals.

Licensed, bonded & insured

Full California contractor's license and insurance coverage — ask to see it.

We know San Mateo's specific rules

San Mateo's older Craftsman-era homes and its mid-century neighborhoods have noticeably different garage sizes — we confirm your home's era and layout before designing.

We evaluate what's already there

Existing garage slabs, framing and rooflines aren't automatically reused or automatically torn out — we assess what's structurally sound first.

Service Areas

Also converting garages nearby.

Based in San Jose, working throughout Santa Clara, San Mateo and southern Alameda counties.

Atherton Belmont Campbell Cupertino Dublin East Palo Alto Foster City Fremont Gilroy Hayward Hollister Los Altos Los Altos Hills Los Gatos Menlo Park Milpitas Morgan Hill Mountain View Newark Palo Alto Pleasanton Redwood City San Carlos San Jose San Mateo Santa Clara Saratoga Sunnyvale Union City Woodside

FAQ

Questions homeowners ask us

It can affect your garage's size and structural condition — older Craftsman and Spanish-style homes sometimes have more compact, single-car garages compared to mid-century two-car structures. We confirm your specific garage's dimensions and condition during the site walk.

A JADU stays within your garage's existing footprint, is capped at 500 square feet, and can share utilities with the main house — usually a simpler, faster permit. An ADU can be larger or detached, requires independent utilities, and has no owner-occupancy requirement.

It depends on project type and the city's current plan check volume — a JADU with shared utilities typically moves faster than a detached ADU with new utility connections. We'll give you a realistic timeline once we've reviewed your specific garage and plans.

Yes — we prepare the Title 24 energy calculations and CF1R documentation as part of every permit package, and manage plan check correspondence directly with the city so you're not the one interpreting correction letters.

Free, No-Obligation Quote

Let's talk about your garage.

Tell us what you're converting it into — a JADU, an ADU, an office — and we'll get back to you with next steps, usually within one business day.

(408) 442-9136