Yes. A building permit is required for all garage conversions in Richmond before any construction begins. You'll need to submit plans through the City's online permitting portal (IMS) or in person at 450 Civic Center Plaza, 2nd Floor. The Planning Division reviews for zoning compliance first, then the Building Division reviews for code compliance. Richmond is required by state law to approve or deny a complete application within 60 days. We handle the entire permit submission — drawings, Title 24 energy compliance forms, structural calculations, and all required documentation.

In most cases, no. Under California Government Code §65852.2, Richmond cannot require you to replace parking spaces lost by a garage conversion if your property is within half a mile of a public transit stop. Given Richmond's BART and AC Transit coverage, the majority of properties in the city qualify for this exemption. We confirm your specific lot's transit-proximity status during the initial consultation before you commit to anything.

Yes. Both attached and detached garages can be converted into ADUs in Richmond. The process is largely the same, though detached garages are subject to standard zoning setback rules — typically 4 feet from the rear and interior side property lines. One advantage of detached conversions: since the structure already exists within your property lines, most cities exempt it from modern setback requirements even if the garage sits close to the property line.

Garage conversions in Richmond typically run $60,000–$200,000 depending on the scope of structural and utility work required. The biggest cost variables are plumbing (garages rarely have it — trenching through a concrete slab for drain lines adds up), electrical panel upgrades, and whether structural framing needs reinforcement. Garage conversions still cost significantly less than ground-up ADU construction, which commonly starts at $200,000+ for a comparable size.

Most garage conversions take 5–8 months from start to finish — roughly 60 days for permit review plus 2–4 months of construction depending on scope. Projects that use Richmond's free pre-approved ADU plans can move through review faster. We give you a realistic timeline at the consultation based on your specific property, not a best-case estimate.

More than most homeowners expect, which is why unpermitted conversions often fail inspection. A proper conversion typically includes: structural assessment and framing upgrades around the former garage door opening; concrete slab work (a 6-inch curb with a 12x12 foundation is required at the garage door opening under Richmond's code); plumbing rough-in for bathroom and kitchen; electrical panel upgrade (converting a garage adds significant electrical load); insulation and drywall to residential standards; egress windows; smoke and CO detectors; and a ductless mini-split for heating and cooling. If the garage is attached to your home, California Building Code also requires a fire-rated gypsum board separation with a self-closing fire-rated door.

A standard ADU is a fully self-contained unit — its own kitchen, bathroom, entrance, and up to 1,200 sq ft. A Junior ADU (JADU) is capped at 500 sq ft, is carved out of existing space within the primary structure or an attached garage, and can share a bathroom with the main home. JADUs have owner-occupancy requirements; standard ADUs do not under current California law. We'll help you decide which designation makes sense for your project based on your goals and property layout.

Possibly. California has provisions for legalizing unpermitted conversions, and Richmond's ministerial approval process applies to qualifying projects. The key is that the structure must meet current health and safety requirements even if it gets evaluated under a less stringent standard than new construction. We do a full assessment of any existing work before recommending a path — because a failed disclosure on sale or a code enforcement complaint is significantly more expensive than permitting done right.

Converting a garage to an ADU typically triggers a reassessment of the new construction only — not your entire property. The existing home's assessed value stays the same. Check with the Contra Costa County Assessor for specifics on your parcel.

Richmond's Building Division performs a final inspection to confirm the unit meets building code and is ready for occupancy. Typical inspection milestones during construction include foundation, framing, electrical rough-in, plumbing rough-in, insulation, and the final walkthrough. We coordinate all inspections and are on-site for each one — you don't have to manage that yourself.