A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateTrusted Garage Conversion Contractor for San Jose Homeowners
A garage conversion in San Jose typically costs between $80,000 and $180,000 for a full living-space build with a kitchen and bath, while a simpler conversion without plumbing can run $45,000 to $75,000. Most projects take 3 to 6 months from permit to final inspection, and the result is a permitted living area that adds square footage, rental income, or a private suite for family. At Lodgewick ADU San Jose, we put the price in writing before any work starts, show up in the window we give you, and back every build with our 365-Day Done Right Promise. If you’re weighing a garage conversion, call (669) 266-4319 and we’ll walk you through what it will really cost on your lot.
We’ve been converting garages across San Jose since 2010 as our Garage Conversion Contractor in San Jose, part of the Kingswell family of home-service companies, and Russ Delmar leads the work here. Homeowners call us after a different contractor gave them a price that changed at the door, or after a crew stopped showing up halfway through. The Kingswell Way is how we avoid both: written price first, defined arrival window, clean job site, written guarantee on every project. If the work isn’t right, we come back and make it right, free of charge, within 365 days. That’s not a slogan. It’s in the contract.
Key takeaways:
- Garage conversions in San Jose run $80,000 – $180,000 for a full ADU with kitchen and bath, and $45,000 – $75,000 for a basic living-space conversion without plumbing.
- Permits take 4 – 12 weeks in San Jose; we handle drawings, submittals, corrections, and inspections.
- Every project includes a written price before work starts and a written 365-Day Done Right Promise.
- We work with homeowners in San Jose, Fremont, Palo Alto, and surrounding cities.
Garage Conversion Permit
A garage conversion permit is the City of San Jose’s formal approval to change your garage from vehicle storage to conditioned living space, and it’s required for any project that alters walls, electrical, plumbing, or the building envelope. Pulling permits in San Jose means submitting architectural drawings, structural calculations, and an energy compliance report (Title 24) to the City’s Building Division, then passing inspections at rough-in and final. We handle the full permit process for you, from drawings through sign-off, and it typically adds $2,000 to $5,000 in city fees and plan costs, depending on scope.
What the City Checks
San Jose reviews garage conversions for ceiling height (7 ft minimum), egress windows in bedrooms, insulation values, and HVAC requirements. A converted garage must meet the same energy code as new construction, which usually means adding insulation to the slab, walls, and roof, plus a mini-split or connection to your home’s system.
How We Handle Permit Delays
Corrections happen. The City returns most first-round submissions with a list of questions, and how fast you respond determines your timeline. Lodgewick ADU San Jose submits with complete drawings up front to cut correction cycles, and we track every response so your project doesn’t sit in a queue.
Garage Conversion to Living Space
A garage conversion to living space means turning unused garage square footage into finished, conditioned area that can serve as a family room, home office, gym, or playroom without necessarily adding a kitchen or bathroom. In San Jose, this is the most budget-friendly conversion type, usually running $45,000 to $75,000, because it avoids the plumbing and mechanical scope that a full ADU requires. We raise the floor if needed, insulate walls and ceiling, add drywall, run electrical, install flooring, and finish with paint and trim, all under permit.
Floor and Slab Work
Most San Jose garages sit on a concrete slab that slopes toward the door for drainage. To convert to living space, we typically level the floor with a moisture barrier and framing, or pour a new interior slab section, then add insulation so the floor isn’t cold year-round.
Insulation and Climate Control
Garage walls often have zero insulation, and San Jose summers push attic temperatures over 120 degrees. We bring walls and ceiling to current Title 24 energy standards and install a ductless mini-split so the room stays comfortable in July and December alike.
Garage to Bedroom Conversion
A garage to bedroom conversion converts garage space into a legal sleeping room with proper egress, insulation, and electrical, and in San Jose that means meeting California Residential Code requirements for bedroom windows, smoke alarms, and an AFCI-protected electrical circuit. This project typically costs $55,000 to $90,000 depending on whether you add a closet, split the garage into two rooms, or connect a bathroom. If the conversion is for an aging parent or a teenager, we design the room with privacy and sound separation in mind.
Egress and Safety Requirements
A bedroom must have a window large enough to escape through in an emergency: minimum 5.7 square feet of clear opening. Garage doors don’t count. We frame in a proper exterior window and hardwire a smoke alarm with battery backup, which the San Jose inspector will verify before sign-off.
Adding a Closet and Bath
A legal bedroom typically needs a closet, and if you want a bathroom attached, plumbing runs push up the cost and timeline. We’ll give you a line-item quote so you can decide whether to do the bath now or rough it in for later without opening walls twice.
Garage Conversion ADU
A garage conversion ADU is an accessory dwelling unit with its own entrance, kitchen, bathroom, and sleeping area, built within the footprint of your existing garage, and in San Jose these permits are now expedited under state ADU law (SB 9 and prior ADU statutes). A full ADU conversion in San Jose runs $120,000 to $180,000 when built from the existing garage shell. Rent on a one-bedroom garage ADU in San Jose’s Alum Rock or East Foothills neighborhoods commands $1,800 to $2,400 a month, which puts many homeowners cash-positive within 5 to 7 years.
What Makes It a Separate Unit
The defining elements are a separate entrance, a full kitchen (permanent range and sink, not a hot plate), and a bathroom with shower. City code also requires a fire separation between the ADU and the main house, which we build with 5/8-inch Type X drywall and a solid-core door at any connecting wall.
Rental and Resale Math
A permitted ADU adds appraised value and rental income that a non-permitted room never will. We walk you through projected rent comps for your specific neighborhood, from Burbank to Los Gatos, so you can decide if the build pencils out before you sign anything.
Garage Apartment Conversion
A garage apartment conversion is a garage-to-apartment build that creates a self-contained rental unit with its own address, meter panel, kitchen, bathroom, and entrance, typically used as long-term housing rather than a guest suite. In San Jose, this often means a detached garage conversion where the apartment sits fully separate from the main house, and the build runs $130,000 to $190,000 once you account for separate utility connections, a new electrical panel, and site work. Homeowners in Garage Conversion Contractor in Milpitas and Union City use these units to house adult children or to rent to teachers and nurses who need a one-bedroom without the price of a San Jose apartment.
Separate Utilities and Meters
A true apartment unit should have its own electrical subpanel and often its own water heater and HVAC. We run a dedicated panel and set up submetering where local utility rules allow, so your tenant pays their share and you don’t eat the cost.
Detached Garage Considerations
Detached garages in older San Jose neighborhoods often have thinner slabs and lower roof pitches than attached garages, which affects floor leveling and ceiling height. We’ll inspect the existing structure and tell you straight what can be saved and what has to be rebuilt, before quoting a fixed price.
Brands We Service
We work with prefab structure manufacturers including Abodu and Plant Prefab, both of which have strong presences in the Bay Area. With Abodu, we handle site prep, foundation, and utility connections for their modular ADU units, and we’re familiar with their submittal package so permits move faster. With Plant Prefab, we coordinate the crane set and finish work, including siding, decking, and interior trim, matching their panelized systems to San Jose’s seismic and energy requirements.
For homeowners who want a conversion built around an existing structure, we also work with Tuff Shed shells and James Hardie siding products. A Tuff Shed shell can serve as a fast, lower-cost base for a detached garage apartment, and James Hardie fiber cement siding holds up against San Jose’s wet winters and dry summers better than wood lap. Whether you have an Abodu unit, a Plant Prefab panel system, or any other make, we can handle the site work and finish build.
Signs You Need a Pro Right Now
- Your garage floor is cracked or settling. A slab that’s sinking means the ground under your garage wasn’t compacted properly. Building living space on a failing slab locks in problems that cost triple to fix after drywall goes up.
- You smell mildew or see water stains on the walls. Moisture inside a garage means the building envelope is compromised. Converting it without fixing water intrusion will trap mold inside new walls and insulation.
- Your home’s electrical panel is maxed out. A converted garage adds circuits for lights, outlets, HVAC, and appliances. If your panel has no open slots, the scope and cost change, and you need that priced before work starts.
- The ceiling is under 7 feet. San Jose won’t sign off on living space below 7 feet. Some older garages in Burbank and Alum Rock fall short, and fixing it means reframing the roof, which is major structural work.
- Your garage shares a wall with a neighbor’s ADU. Fire separation and wall-sharing rules change the design and cost. Guessing here leads to failed inspections and rework, and it’s exactly the kind of thing that should be in your written quote on day one.
Our Process, Step by Step
- 1
Site visit and measurement. Russ Delmar walks your lot, measures the garage, checks the slab, roof, and electrical panel, and listens to how you want to use the space. This visit is free and takes about an hour.
- 2
Written fixed-price quote. Within a week, you get a line-item price covering permits, labor, materials, and a defined window for when we start and finish. No allowances that let the price drift.
- 3
Permit drawing and submittal. We draw the plans, pull in structural engineering where San Jose requires it, and submit to the Building Division. We manage every correction letter through approval, and you approve every material selection before it’s ordered.
- 4
Build and inspections. Our background-checked, uniformed crew shows up in the window we gave you. We keep the site clean daily, call for inspections at rough-in and final, and walk you through the work at every milestone.
- 5
Final walkthrough and written guarantee. Before we call the job done, you walk the space with us and we fix anything that’s not right. Then you get the 365-Day Done Right Promise in writing: if work fails within a year, we come back free.
How Much Does Garage Conversion Contractor Cost in San Jose?
A basic garage conversion to living space in San Jose runs $45,000 to $75,000. A garage-to-bedroom conversion with a closet and egress window runs $55,000 to $90,000. A full garage conversion ADU with its own kitchen and bathroom runs $120,000 to $180,000, and a detached garage apartment conversion runs $130,000 to $190,000. These are real ranges for San Jose’s permit and labor market, not bait numbers.
What drives the price: whether you need a full kitchen and bath (the single biggest cost), the condition of your slab and roof framing, your panel’s electrical capacity, and whether your garage is attached or detached. Plan on permit and design fees of $2,000 to $5,000. The best way to avoid overpaying is to get a fixed line-item price and refuse allowances. Our free estimate includes a written scope, a defined price, and a realistic window. Call (669) 266-4319 and we’ll deliver all three.
Our Service Area Near San Jose
We build garage conversions across San Jose, including Alum Rock, Burbank, East Foothills, and Silver Creek, and we serve surrounding cities including Milpitas, Union City, Los Altos, Los Altos Hills, Los Gatos, and Portola Valley. We also take projects in Fremont and Palo Alto through our partner locations: see our Garage Conversion Contractor in Fremont and Garage Conversion Contractor in Palo Alto pages. Most San Jose estimates are scheduled within two weeks of your call. For a broader look at our work, start with our home page.
Serving San Jose, CA - Our Local Coverage Area
We’re based in the San Jose area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions About Garage Conversion Contractor in San Jose
A garage conversion contractor is a licensed builder who turns existing garage space into conditioned living area, a bedroom, or a full ADU with permits and inspections. We handle design, permitting, structural work, plumbing, electrical, insulation, drywall, and finishing. Our San Jose team has done this work since 2010, and every project carries a written guarantee. Call (669) 266-4319 for a free estimate on your garage.
A basic living-space conversion takes 8 to 12 weeks from the day we start framing. A full ADU conversion with kitchen and bath takes 4 to 6 months once permits are issued. Permit approval in San Jose adds 4 to 12 weeks depending on the Building Division’s current workload and whether corrections come back. We give you a written window before work starts and update you as inspections land.
A simple conversion without plumbing runs $45,000 to $75,000. A build with a bedroom, closet, and egress runs $55,000 to $90,000. A full ADU with kitchen and bathroom runs $120,000 to $180,000, and a detached apartment runs $130,000 to $190,000. We put a fixed price in writing before any work starts, and that price doesn’t change at the door. Call (669) 266-4319 for a real number on your project.
Yes. We handle site prep, foundations, utility connections, and finishing work for Abodu modular ADUs and Plant Prefab panelized units across San Jose. We’re familiar with their submittal paperwork, which helps permits move faster through San Jose’s Building Division. Whether you have an Abodu unit, a Plant Prefab system, or any other prefab brand, call (669) 266-4319 and we’ll tell you what’s needed.
If a previous contractor walked off mid-project, left you with open walls or an exposed roof, or your half-finished conversion is failing inspection, we’ll come look. We’ve taken over several San Jose conversions left incomplete by other crews. Call (669) 266-4319 and a live person answers, any time, day or night.
Every Lodgewick project includes the 365-Day Done Right Promise, a written guarantee that if any of our work fails within a year of completion, we return and fix it free of charge. It’s not verbal and it’s not conditional. We put the guarantee in your contract before we start, and we honor it after we’re paid. Our Garage Conversion Contractor in San Jose page has more details on how we build and back our work.
Clear clutter from the garage so we can measure the slab, walls, and roof easily, and have your electrical panel accessible. Pull any old inspection reports or property surveys if you have them. Think about how you want to use the space, kitchen or no kitchen, rental or family use, so we can price the right scope the first time. Then call (669) 266-4319 and we’ll schedule a free walkthrough.
Schedule Your Garage Conversion Contractor Service in San Jose Today
You’ll get a written price before any work starts, a defined arrival window from our crew, a clean job site during the build, and the 365-Day Done Right Promise in your contract. Call (669) 266-4319 to schedule your free, no-obligation estimate. A live person answers, 24/7, and we’ll walk your lot and give you a real number. No pressure, no price bumps, just a straight answer.
Written by Russ Delmar, Owner at Lodgewick ADU San Jose, serving San Jose since 2010.
