Garage Conversions in San Diego
Turn your underused garage into a permitted ADU, bedroom, in-law suite, or home office. Subworkit Contracting handles design, permits, and construction — typically $75,000–$130,000 for a full ADU conversion.
A garage conversion is the most affordable way to add legal, permitted living space to a San Diego home. Whether you're converting to a full ADU for rental income, an in-law suite for family, or a home office and workout room, Subworkit Contracting is a licensed general contractor (CA #945572) that handles the entire process. We design, permit, insulate, run plumbing and electrical, frame interior walls, install windows and doors, finish drywall, and complete final finishes — typically for $75,000–$130,000 depending on ADU features.
Garage conversions are the sweet spot of ADU construction. The foundation, walls, and roof already exist — so you save $40,000–$80,000 vs. building a detached ADU from scratch. California law (AB 68, AB 881, and subsequent updates) now severely limits cities' ability to block garage ADU conversions, making permits faster and cheaper than detached new construction. In San Diego County, a fully permitted garage-to-ADU conversion with kitchen, bathroom, and separate entrance typically takes 4–6 months after permits are approved.
Not every garage conversion becomes an ADU. Many homeowners convert their garage into a permitted bedroom, home office, gym, playroom, or in-law suite without a full kitchen. These conversions are cheaper ($35,000–$65,000) and permit faster. The key distinction: if there's a full kitchen (range, sink, refrigerator circuit), it's legally an ADU and subject to ADU code. If there's no kitchen — just bedroom, bathroom, or living space — it's a habitable room addition under normal code.
Our garage conversion process handles every step. We evaluate your garage's structure (slab thickness, wall framing, header sizes, existing utilities), design the new floor plan, and submit permits to your jurisdiction. Construction includes removing the garage door and infilling with a wall, windows, and entry door; pouring a proper living-space floor over the garage slab with moisture barrier and insulation; framing interior partition walls; running new plumbing and electrical circuits tied to your main panel (or a sub-panel for ADUs); insulating to current Title 24 standards; installing drywall, flooring, interior doors, trim, cabinetry (for ADUs), and finishes. Mini-split HVAC systems are standard for garage conversions due to their efficiency and no-ductwork requirement.
What We Offer
Garage-to-ADU Conversions
Full ADU conversions with kitchen, bathroom, separate entrance, and dedicated utilities. Rentable at market rates — $1,800–$3,500/month in San Diego.
Garage-to-Living-Space Conversions
Bedroom, home office, in-law suite, gym, or playroom conversions without a kitchen. Cheaper and faster to permit than ADUs.
Garage Door Infill
Remove garage door, frame new wall, install windows and exterior entry door matched to home's exterior finishes.
Floor System Upgrade
Raised floor system over existing slab with moisture barrier and insulation, or epoxy and leveling for single-level integration.
Plumbing & Electrical
New plumbing tied to existing drain and supply lines, new electrical circuits (or sub-panel for ADUs), mini-split HVAC, and dedicated water heater for ADUs.
Permits & Inspections
Full permit handling including architectural drawings, Title 24 energy calcs, structural review, and coordination with all required inspections.
Why Choose Subworkit for Your Garage Conversion
Licensed General Contractor — CA #945572 with full insurance and bond
ADU Specialists — Deep experience with San Diego County ADU code and permit process
Fixed-Price Contracts — Clear, itemized estimates with no surprise change orders
Fast Permits — Complete permit packages that pass plan check faster
Rental Income Ready — ADU conversions built to rent at $1,800–$3,500/month
Design-Build Under One Roof — Architecture, permits, and construction from one team
Our Garage Conversion Process
Free Consultation & Feasibility
We evaluate your garage's structure, utilities, and your goals (ADU vs. living space). Ballpark budget provided during the visit.
Design & Permits
Architectural drawings, Title 24 energy calcs, and permit submittal to your jurisdiction. Typical approval: 2–4 months.
Construction
Garage door infill, floor system, framing, plumbing, electrical, insulation, drywall, HVAC, and finishes. Typical duration: 4–6 months.
Final Inspection & Keys
Building, plumbing, electrical, and final inspections. Occupancy certificate issued. For ADUs, you're ready to list for rent.
Frequently Asked Questions
How much does a garage conversion cost in San Diego?
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A full garage-to-ADU conversion (kitchen, bathroom, separate entrance) typically runs $75,000–$130,000. A garage-to-living-space conversion (bedroom, home office, in-law suite without a kitchen) runs $35,000–$65,000. Pricing depends on square footage, finish level, and whether HVAC and plumbing need to be brought in from far away.
How long does a garage conversion take?
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From initial design to final inspection, most garage ADU conversions take 7–10 months. That's 1–2 months for design, 2–4 months for permits, and 4–6 months for construction. Simpler living-space conversions (no kitchen) can complete in 5–7 months total.
Can I rent out my converted garage?
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Yes — if it's permitted as an ADU (with kitchen, bathroom, and separate entrance), California law guarantees your right to rent it at market rates. San Diego ADU rents range from $1,800–$3,500/month depending on size and location. Non-ADU conversions (no kitchen) can be used by family but not legally rented as separate dwellings.
Do I need to add parking to replace the garage?
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Usually no. California ADU law eliminates parking replacement requirements for most garage conversions within 0.5 miles of public transit, which covers most of San Diego County. Your contractor or plan checker will confirm your specific site.
What's the difference between a garage conversion ADU and a detached ADU?
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A garage conversion uses your existing garage structure (foundation, walls, roof) and costs $75,000–$130,000. A detached ADU is built from scratch in your backyard and costs $150,000–$280,000. Garage conversions are faster, cheaper, and permit easier — but are limited to your garage's footprint (usually 200–400 sq ft). Detached ADUs can be up to 1,200 sq ft.
Do I need to live in the main house to rent the ADU?
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No — California state law (as of 2020) eliminated owner-occupancy requirements for ADUs permitted through 2025, and this is being extended. You can rent out both the main house and the ADU. Check with us for current rules at the time you permit.
Real Project Spotlight
Garage-to-ADU Conversion in El Cajon — 380 sq ft Rental Unit
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Free consultation with a licensed garage conversion contractor. We'll evaluate your garage, outline permit requirements, and provide a ballpark budget on the spot.
Where We Serve
We convert garages throughout San Diego County including La Jolla, Del Mar, Encinitas, Carlsbad, Chula Vista, Escondido, Poway, Oceanside, Santee, El Cajon, La Mesa, National City, and all surrounding communities.
What Our Clients Say
"This is a very nice company that offered the services I needed. If you are in need of a company that does a clean and professional job, then I highly recommend Bernard and his team!"
— Happy Customer
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