A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Fremont, CA
Fremont is one of the few Bay Area cities where adding an ADU to a 1950s or 60s ranch home is often simpler on paper than it is in the ground, and that’s what we plan for from day one. Flat lots off streets like Blacow Road and Grimmer Boulevard give us room to work, but original slab foundations, outdated 60-amp panels, and seismic bracing requirements near the Hayward Fault mean every project starts with groundwork most homeowners don’t see coming. As an ADU company serving Fremont, we write down the full scope and price before anything gets built. Want to talk it through? Call (669) 266-4319.
Why Fremont Homes Are Different
Most of Fremont’s housing stock went up between 1950 and 1980, and it shows in the bones: wood framing over concrete slab or crawlspace, stucco or wood siding, and electrical panels that were sized for a different era entirely. When we work on a Fremont ADU, we regularly find garages still running on original 1960s 60-amp service. That panel can’t support a new dwelling, so a service upgrade to 200 amps lands on the permit before the ADU does. It’s one of the most common permit friction points in this city, and we factor it into the written price up front so it doesn’t ambush you mid-project.
Climate shapes the rest. Wet winters and dry, warm summers mean insulation and moisture management matter more than anything else, and Fremont’s spot near the Hayward Fault makes seismic bracing standard practice on every ADU we build, not an optional line item. Older ranches and split-levels on flat rectangular lots are the norm here, and many of them need retrofitting before an accessory dwelling unit, or ADU – a small standalone home on your existing property – can safely attach or sit beside the main house. That’s a Fremont reality our crews plan for on the first visit.
Our Main Fremont Services
Homeowners in Fremont usually call us about two things: expanding the house they already live in, and turning space they already own into a rentable or family-ready dwelling. Each service has its own Fremont page below.
Home Addition Contractor in Fremont
Adding square footage to a 1960s ranch or split-level in Fremont usually means tying new framing into an aging footprint, and on many of these older homes that starts with seismic evaluation before a wall comes down. We’ve worked on additions near Irvington and Centerville where the old slab dictated header placement and footing depth more than the floor plan did. Our job is to make the new space feel like it was always there, and to hand you a written price for the whole thing before demolition day. Home Addition Contractor in Fremont
Garage Conversion Contractor in Fremont
A garage conversion in Fremont takes an existing structure and turns it into livable space, but the existing structure often fights back: cracked slabs, unpermitted prior work, and the 60-amp panel problem we mentioned. We assess the concrete, the roof, and the service panel in the first walkthrough. In neighborhoods like Glenmoor and Kimber-Gomes, garages built in the 50s and 60s sit on slabs that need leveling before flooring goes in. The permit path is usually shorter than a detached ADU, but the prep work isn’t. Garage Conversion Contractor in Fremont
ADU Builders in Fremont
A detached ADU in Fremont – a small standalone home on your existing property – means a new foundation, new utility runs, and a design that fits a flat lot and the city’s setback rules. Many Fremont lots in neighborhoods like Mission San Jose and Niles have the room, but not every lot clears the requirements without a variance. We match the build method to your lot: panelized kits, prefab systems from companies like Plant Prefab or Abodu, or full site-built framing. Either way, the written guarantee covers the entire project. ADU Builders in Fremont
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in Fremont
We work directly with leading ADU systems and material brands, including Plant Prefab, Abodu, James Hardie, and Tuff Shed. Parts and panels are ordered to your Fremont job from the brand’s Bay Area supply chain, with lead times confirmed and put in writing before we start. See our brands for details.
Pricing for ADU Company in Fremont, CA
| Service | Typical range in Fremont |
|---|---|
| Detached ADU (site-built) | $280 – $420 per sq ft |
| Prefab ADU (Plant Prefab, Abodu, or similar) | $240 – $380 per sq ft |
| Garage conversion (full build-out) | $180 – $310 per sq ft |
| Garage conversion (finish-out only) | $120 – $210 per sq ft |
| Home addition (ground-up) | $260 – $400 per sq ft |
| Home addition (second story) | $300 – $450 per sq ft |
| Electrical service upgrade (60A to 200A) | $3,800 – $6,500 |
| Seismic retrofit (existing structure) | $5,000 – $12,000 |
| Foundation repair or leveling (per project) | $4,500 – $14,000 |
| Site prep and utility trenching | $6,000 – $18,000 |
Fremont prices climb when an original 60-amp panel needs upgrading to 200 amps, when a slab needs leveling, or when seismic bracing has to be added to the main house before the ADU can tie in. Whatever the number is, it’s written down before work starts: no price changes at the door, no surprise change orders.
Neighborhoods We Serve in Fremont
We run ADU, garage conversion, and home addition projects all over Fremont, from the older ranches near Centerville and Irvington to the larger lots in Mission San Jose, Niles, and Warm Springs. Most of our Fremont jobs fall within a 20-minute dispatch window from the Bay Area office, and we schedule walkthroughs around your workweek, not ours.
- Centerville
- Irvington
- Mission San Jose
- Niles
- Warm Springs
Service Area – Cities Near Fremont
While this page is focused on Fremont, our crews also run ADU and addition projects in the cities around it. You can read the city-specific pages for Union City, CA, Milpitas, CA, Palo Alto, CA, and San Jose, CA.
Serving Fremont, CA - Our Local Coverage Area
We’re based in the Fremont 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 ADU Company in Fremont
Most Fremont walkthroughs happen within a few business days of your call, and scheduling is coordinated from the Bay Area office with crews dispatched locally to Fremont. Call (669) 266-4319 and a live person will set the window, not a voicemail loop.
Yes. Fremont requires building permits for ADUs, garage conversions, and most home additions, and many older homes here need a panel upgrade or seismic bracing before the final sign-off. We pull permits and handle inspections as part of the written price.
Yes, the panel upgrade is part of the job when your existing service can’t support the new dwelling. We include the electrical work, permit, and inspection in the written estimate, so the number you approve is the number you pay. Call (669) 266-4319 for a free estimate.
Ready for a real number on your Fremont ADU, garage conversion, or home addition? Call (669) 266-4319 today to schedule your free estimate. Our team serves Fremont under The Kingswell Guarantee: written price first, clean job site, and a written guarantee on every project.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Fremont Customers Say
"Converted our garage into a rental studio. The crew was respectful of the neighbors and kept the site clean. It's bringing in rent now and paid for itself faster than I expected."
- Grace Yoon"Built a backyard unit for my mother in law. They handled the permits, gave me a real timeline, and stuck to it within a few days. The written price is what we paid, which anyone who's done construction knows is rare."
- Dennis Fairchild"Added a suite for my dad. They walked us through every cost before a hammer swung and stuck to it. The written price is what we paid, no change orders."
- Ingrid Salazar
