A garage-to-ADU conversion turns an existing garage into a permitted, code-compliant dwelling unit. IBA Builders starts every project with a structural and zoning assessment — ceiling height, slab condition, setbacks, and utilities — before design begins.
CSLB License #1074505
Itamar Ben Asulin on every project
Valley · Westside · South Bay
A garage conversion requires structural upgrades, insulation, egress windows, plumbing, electrical, and HVAC work to meet California residential standards — not garage code.
Ceiling height. LA residential code requires a minimum 7-foot ceiling in any habitable room. Many older garages sit at 6′8″ or lower. If the slab can be lowered — or the roof raised — conversion is still possible, but the cost picture changes significantly.
Slab condition. The concrete floor must support finished flooring, insulation, and new load paths. A slab that’s cracked, heaving, or undersized may need partial demolition and re-pour.
Setback position. A garage 2 feet from a rear property line may still qualify under California’s ADU streamlining rules — even if that distance would block a new-build ADU. State law allows legally built existing structures to convert regardless of current setback minimums. See our guide to LA zoning rules that affect garage conversion eligibility.
Utility access. The conversion needs to connect to water, sewer, gas, and electrical. A garage on the far side of the lot from the main connections adds cost and scope that a surface-level quote won’t show. Reviewing LADBS permit requirements for residential conversions early helps clarify what code compliance involves for your specific structure.
IBA Builders checks all four before any design begins. If you’re weighing your options, our comparison of detached ADU vs. garage conversion can help you decide which path makes more sense for your property.
Every IBA Builders garage conversion meets full residential code requirements — not the lower bar that applied when the structure was a garage.
Confirmed at or above the 7-foot habitable room minimum before design is finalized. If modification is required, it’s scoped and priced before plans are drawn.
Every sleeping room gets a code-compliant egress window — sized, positioned, and permitted correctly. Required by California residential code.
Shower and wet area installations meet California’s ASTM C627 tile assembly standard. Membrane applied and inspected before tile is set.
Dedicated circuits for kitchen appliances, HVAC, and lighting. Panel upgrade scoped at assessment if the existing service is insufficient.
Energy compliance met for walls, ceiling, and floor. Title 24 compliance report included in the LADBS permit submission.
IBA pulls every permit required — building, plumbing, electrical, mechanical. No owner-builder permits. No skipped inspections.
Structural and zoning assessment: slab thickness, ceiling height, setback verification through LADBS records, utility distances, and panel capacity. Written feasibility summary before any design is commissioned.
Full LADBS package: architectural plans, structural calculations, Title 24 report, and site plan. We manage plan check and respond directly to any correction notices.
Sequenced trades through inspections: demo and rough framing → rough-in plumbing & electrical → insulation & Title 24 → drywall → finishes. Each LADBS inspection passes before the next phase.
Pressure-test plumbing, verify GFCI protection, confirm egress operation, walk the unit against approved plans. LADBS final inspection becomes a confirmation, not a discovery — ending with the Certificate of Occupancy.
San Fernando Valley clay soil that shifts slabs over decades. Westside lots with tighter utility routing. Eastside and SGV Craftsman properties with lower plate heights. South LA alley-loaded lots where entrance repositioning is the variable. We serve the full county — 818, 310, 213, and 626 area codes — with an assessment tailored to what’s actually typical in your neighborhood.
The first thing we do walking into a garage for a conversion assessment is stand in the middle and look up. Ceiling height tells us immediately whether we’re dealing with a straightforward conversion or a structural challenge.
“I had a homeowner in Northridge who had already gotten one contractor quote. The quote assumed a standard conversion. Nobody had measured the ceiling — it came in at 6′6″ at the peak. The slab was poured thick enough, the setbacks were compliant, but that ceiling height meant either a full slab-dig and re-pour or a significant roof modification. Neither was in the first quote.”
— ITAMAR ASSULIN, OWNER, IBA BUILDERS
After ceiling, we check the slab edge near the garage door opening — on LA lots that’s where decades of clay-soil cycling shows up most. Then the electrical panel distance to where the new kitchen and bathroom will sit. Three checks, fifteen minutes. They tell us whether we have a clean conversion or a project with scope that needs to be priced accurately. For how those findings affect your budget, see our breakdown of how much a garage conversion ADU costs in LA. Learn more about Itamar and IBA Builders, or read the full ADU permitting process in Los Angeles County.
Possibly, but it requires more upfront work. If no original permit can be found, we may need to file a permit application that treats the structure as new construction for setback and code purposes. In some cases, a letter from a structural engineer confirming the existing build quality is sufficient to move forward. We assess this during the feasibility review before any design begins.
Most garage conversions in Los Angeles run four to seven months from initial assessment to final LADBS sign-off. The permit review phase at LADBS typically accounts for six to twelve weeks of that timeline, depending on current plan check volume. Construction itself, once permits are issued, generally takes eight to twelve weeks for a standard single-car garage conversion.
In many cases, no. California state law eliminated the requirement to replace garage parking when an ADU conversion removes a covered space, provided the property is within a half-mile of public transit. Most Los Angeles properties meet this threshold. We verify your specific address against transit proximity requirements during the feasibility assessment.
The garage door opening is typically framed in and replaced with a standard exterior wall assembly — insulated, sheathed, and finished to match the rest of the structure. The new wall can include a code-compliant entry door, windows, or both, depending on the design. This framing work is included in our conversion scope and permitted as part of the building permit package.
Yes, but only on the value of the converted space — not on the entire property. California’s property tax reassessment rules mean the rest of your home’s assessed value stays in place. The ADU addition is assessed separately as new construction value. Your county tax assessor will notify you of the updated assessment after the Certificate of Occupancy is issued.
An honest feasibility assessment — ceiling, slab, setbacks, and utilities — before a dollar is spent on plans. Call Itamar and the IBA Builders team or email in**@*********rs.com.