A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Garage Conversion Contractor Across San Bernardino
A garage conversion in San Bernardino typically costs $45,000 – $95,000 for a standard attached two-car garage turned into living space, before permit and plan-check fees. That range widens to $110,000 – $160,000 when you add a bathroom or kitchenette, and detached conversions run about 15 – 20% higher because of the extra utility trenching and envelope work. We’re Fielding ADU Builders, and we handle the whole job: structural, plumbing, electrical, insulation, drywall, and finish. Call (361) 315-4177 and we’ll walk the project with you.
If you live in San Bernardino, you already know the housing stock we’re talking about. Rows of 1950s and 1960s tract homes with attached garages, slab floors, and roof lines that were never meant to carry a conditioned room. We work those garages every month. We know what the city’s plan check will flag, what the older framing will need, and what the final invoice should look like before demolition even starts.
Why Fielding ADU Builders Is San Bernardino’s Preferred Garage Conversion Contractor
Reed Calloway leads our garage conversion work, and the standard he holds is simple: price in writing before any work starts, permitted work done by the book, and a written one-year guarantee on the finished job. That guarantee is The Garrison Standard, the backbone of the Garrison Partners family we belong to. It has been in place since 2006. Not a verbal promise. A written one.
We are an independently owned and operated member of the Garrison Partners family. Being independent matters to San Bernardino homeowners because it means decisions get made locally, by people who know this city’s permit counter and its older housing stock. Being part of Garrison Partners matters because the standards are fixed. Background-checked, uniformed crew on every job. A live person answers the phone at noon or midnight. No voicemail tree.
Our Garage Conversion Contractor team has converted garages from the Del Rosa area north of Highland Avenue to older lots near Perris Hill Park and the neighborhoods off North Mount Vernon Avenue. We know which San Bernardino garages were slab-on-grade with almost no footing depth. We know which ones have roof framing undersized for a ceiling. That local knowledge changes the estimate, not just the build.
Key takeaways:
- Typical San Bernardino garage conversion: $45,000 – $95,000 for a basic living space; $110,000 – $160,000 with a bathroom or kitchenette.
- Written price before any work starts. The number you approve is the number on the final invoice.
- One full year of written guarantee, with a free second visit if the work fails inside that year.
- Background-checked, uniformed crew. A live person answers the phone 24/7.
Garage Conversion to Living Space in San Bernardino
Garage Conversion to Living Space in San Bernardino means turning an attached or detached garage into a legal, conditioned room: insulated walls, floor elevation set for living use, drywall, electrical, egress, and a heating/cooling tie-in. Older San Bernardino garages often need floor leveling first because the original slab was poured with a slope toward the vehicle door. That correction alone can add $3,000 – $8,000 before framing begins.
Attached Garage Conversion
Most San Bernardino homes in the 1950s – 1970s tract belts have attached garages with shared walls and a roof tied to the house. The advantage is structural simplicity and closer electrical and HVAC access. The work involves framing out the vehicle door opening, raising or replacing the slab where needed, and tying ventilation into the existing roofline so the room meets current California energy code.
Detached Garage Conversion
Detached garages, common on larger lots in San Bernardino, cost more because utilities have to be trenched from the house. You’re also dealing with a standalone envelope: four exposed walls, a separate roof, and often a foundation with no perimeter insulation. Budget $55,000 – $110,000 for a detached conversion without plumbing. With a bathroom, expect to cross $130,000.
Garage to Bedroom Conversion in San Bernardino
Garage to Bedroom Conversion in San Bernardino turns the garage into a legal sleeping room, which triggers specific Code requirements: a closet is optional in California, but an egress window is mandatory, and the room needs proper insulation, heating, and a smoke and carbon monoxide alarm tied to the house. A straightforward garage-to-bedroom conversion here runs $45,000 – $75,000. If the existing slab has to be raised or leveled and a new egress opening cut into a load-bearing wall, the number climbs toward $85,000.
Egress and Permitting
Nothing gets a garage-to-bedroom conversion red-tagged faster than a missing egress window. San Bernardino’s building department applies the California Residential Code, which means the sleeping room needs a window large enough to exit through in a fire, with an opening of at least 5.7 square feet. Older garages with a single vehicle door and no side windows will need a new opening cut, framed, and waterproofed.
Slab and Floor Work
Garage slabs here were poured for cars, not people. They slope, they crack, and they sit lower than the house floor. Most garage-to-bedroom jobs in San Bernardino need either self-leveling compound, a sleeper floor system, or full slab replacement. We price that work explicitly in the written estimate so it never shows up as a change order after demolition.
Trusted Brands We Service in San Bernardino
We work with the major prefab and modular ADU platforms San Bernardino homeowners already research: Abodu, Cover, and Dvele, plus conventional construction using James Hardie siding, and we also handle Cover repair in San Bernardino when existing units need service. That gives you real options. A prefab shell can compress framing time, but the site work still has to be done right: grading, slab prep, utility tie-ins, and inspection sequencing with the City of San Bernardino. We’re fluent with each platform’s drawings and submittal requirements, so the permit package moves without back-and-forth.
Common Garage Conversion Contractor Problems We See in San Bernardino Homes
- Undersized roof framing. Many San Bernardino garages built between the 1950s and 1970s were framed with 2×4 roof members holding a single-ply or built-up roof, not the 2×6 or engineered framing a conditioned room needs. Before drywall goes up, we often have to sister or replace roof framing and add proper attic ventilation.
- Slab slope and elevation. Garages here were poured to shed water toward the vehicle door. If you build living space on that slab, the floor runs visibly downhill. Leveling is not optional on most San Bernardino conversions, and it is the single most common scope item the first contractor left out.
- Utility split locations. The electrical panel may be on the opposite side of the house from the garage, and the sewer line may run nowhere near the garage. When we add a bathroom to a San Bernardino garage conversion, trenching and sewer tie-in often add $8,000 – $15,000 depending on depth and distance.
- Treating prefab as turnkey. A prefab or panelized product still requires site grading, slab or foundation prep, utility hookups, and local inspection milestones. The prefab shell is one piece of the job. The real cost driver in San Bernardino is what happens in the ground and at the permit counter.
Pricing for Garage Conversion Contractor in San Bernardino, CA
Here are honest numbers for the San Bernardino market, as of early 2026:
- Basic attached garage to living space: $45,000 – $75,000
- Attached garage to bedroom with egress and insulation: $55,000 – $85,000
- Garage conversion with a full bathroom: $110,000 – $150,000
- Detached garage conversion: $55,000 – $110,000, higher with plumbing
Plan check and permit fees run $3,000 – $6,000 on most San Bernardino conversions. The big cost swing is the existing slab and roof condition. A garage that needs full slab replacement and roof reframing will cost meaningfully more than one built on a sound slab with usable framing. That’s why we walk the site before pricing. Call (361) 315-4177 for a written estimate, free.
The Garrison Standard: One Year in Writing
Every garage conversion we build in San Bernardino carries a written one-year guarantee. The Garrison Standard covers workmanship defects for 365 days; if something fails, we come back and make it right at no charge. That includes a free second visit to correct any covered defect. It is spelled out on paper before you sign anything: what it covers, how long it runs, and exactly how we make it right. Most contractors in San Bernardino will not put that sentence in writing. We do, on every job.
We Also Serve Cities Near San Bernardino
Our San Bernardino garage conversion work reaches surrounding communities too. We serve Loma Linda, Highland, Rialto, and Colton, with scheduling and dispatch coordinated from our Inland Empire office in the Riverside-San Bernardino area. If you’re a few miles outside the city limits, call and ask. We’ll tell you straight whether we can get a crew to your lot.
Serving San Bernardino, CA - Our Local Coverage Area
We’re based in the San Bernardino area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Garage Conversion Contractor in San Bernardino
Yes. A garage conversion that changes the space from vehicle storage or non-habitable use to conditioned living space requires a building permit from the City of San Bernardino, and it will trigger plan check, energy compliance review, and inspections at framing, electrical, plumbing, and final. Working without a permit creates code enforcement exposure and problems when you sell the property. We pull the permits, coordinate inspections, and hand you a closed-out permit file. Call (361) 315-4177 for a free estimate and a permit pathway.
The slab and the roof framing, in that order. Older San Bernardino garages frequently have slabs over an inch out of level and roof framing that was never sized for a ceiling or a conditioned envelope. If the first quote assumed the slab could stay and the roof could be insulated in place, the real job will cost more once walls open. We price those corrections in writing from the start, so the number you approve is the number on the final invoice. Call (361) 315-4177 for a line-item quote before you commit.
Yes. A legal bedroom in San Bernardino requires the egress window regardless of closet, plus insulation at current energy code, heating, and smoke and carbon monoxide coverage. We cut and frame an egress opening where none exists, reframe the wall if it is load-bearing, and tie the alarm system into the house. A closet is straightforward to frame wherever it fits. Budget $55,000 – $85,000 depending on slab and wall conditions. Call (361) 315-4177 for an exact number.
Plan on 10 to 16 weeks from permit submittal to final inspection, assuming no major slab replacement or sewer reline work. Plan check alone in San Bernardino typically runs 3 to 5 weeks on a conversion that changes occupancy classification. Framing, mechanical, and finish work take the remaining time. We give you a written schedule with the estimate, and we hold to it. Call (361) 315-4177 and we’ll walk through the calendar for your specific garage.
Faster on framing, sometimes. Cheaper overall, rarely. A panelized or prefab shell can save 2 to 4 weeks of site framing, and we work with Abodu, Cover, and Dvele when that makes sense. But in San Bernardino, the ground work, slab correction, utility tie-ins, and permit sequencing are the long lead items. The prefab shell does not shortcut the San Bernardino permit counter or the foundation under it. We will give you an honest comparison of prefab versus conventional for your lot and your budget. Call (361) 315-4177 to talk through it.
If you need a Garage Conversion Contractor in San Bernardino who puts the price in writing and stands behind the work for a full year, call (361) 315-4177. Estimates are free. The number you approve is the number you pay.
Written by Reed Calloway, Owner at Fielding ADU Builders, serving San Bernardino since 2006.
