ADU Company in Los Serranos, CA
Kitchen remodeling in Los Serranos means working with 1970s-through-2000s tract homes that were built for one era and now need to function for another. We’re Foundry ADU Builders, and we handle that work from the first cabinet pull to the final walkthrough. The 91709 housing stock tends toward original layouts, soffited ceilings, and kitchens that were sized for a 1980s family of four, not an ADU with a rental tenant or aging parents. Mountain-adjacent heat and a high fire-severity zone add material decisions most kitchen remodelers never think about. Call (866) 251-7857 when you’re ready to price it.
Why Los Serranos Homes Are Different
Los Serranos sits in unincorporated San Bernardino County, which means any ADU or interior remodel attached to one goes through County Planning and Building, not Chino Hills city hall. That changes setbacks, permit sequencing, and sometimes utility routing. Some pockets in 91709 run on septic or shared wells rather than municipal sewer and water, which affects where a kitchen sink or bathroom stack can actually land without a costly re-route. We’ve worked through enough of these to know the questions to ask before the first wall opens.
The heat is the other variable. Summer temperatures past 100°F are normal here, and the Chino Hills edge puts much of 91709 in a high fire-severity zone. For an ADU kitchen, that means ventilation specs matter more than they do in coastal Orange County, and exterior materials adjacent to the cooking area need to hold up under direct foothill sun. Original tile roofs and attached garages are common, so garage-conversion ADUs usually inherit a slab we have to evaluate before running new plumbing or gas lines. HOA design review layers onto County zoning in several Los Serranos neighborhoods, and we factor that into the schedule from day one rather than discovering it after demo.
Equestrian easements and former barn pads are a genuine Los Serranos thing. A detached ADU built where a horse shelter used to stand often triggers County grading and drainage review that a standard suburban lot in Chino or Ontario never faces. We’ve helped homeowners navigate that, and we’ll tell you early if your lot is one of the ones that will need it.
Our Main Los Serranos Services
Most Los Serranos homeowners call us about two things: building the ADU itself, or finishing the bathroom inside one. Here’s what each looks like in this community.
ADU Builders in Los Serranos
We build detached ADUs, garage conversions, and additions across the 91709 foothills. Because Los Serranos is unincorporated County territory, we sequence permits through San Bernardino County rather than Chino Hills, and we account for HOA design review where it applies. The full picture is on our ADU Builders in Los Serranos page.
Bathroom Remodeling in Los Serranos
ADU bathrooms in Los Serranos usually start as a small alcove off a converted garage or a second floor hall bath. We handle layout, waterproofing, ventilation for foothill heat, and the permit details. See Bathroom Remodeling in Los Serranos for scope and pricing.
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.
Kitchen Remodeling in Los Serranos
Kitchen remodeling in Los Serranos has to work around two realities: the existing 1970s-to-2000s tract home shell, and the extreme summer heat that makes ventilation and durable surfaces non-negotiable. Homeowners adding an ADU with a full kitchen, or updating the main house kitchen alongside an ADU project, deal with soffits, slab foundations, and county-level permit review. Foundry ADU Builders carries this work from demolition through finish, including the interior build-out that makes a prefab unit livable. Here’s the full spectrum of what we do, and you can read more at Kitchen Remodeling.
ADU Kitchen Build-Out
Signs you need it
Your ADU shell is up but the interior is raw, and you need a functional kitchen before a tenant can move in or a parent can cook independently.
What it costs in Los Serranos
A full ADU kitchen build-out in Los Serranos typically runs $25,000 to $45,000 depending on cabinet grade, appliance package, and how much plumbing re-routing the slab requires.
How we do it
We rough in plumbing and gas, install ventilation rated for foothill heat, set cabinets and counters, then finish with lighting, flooring, and appliance hookups under one contract.
Main House Kitchen Update
Signs you need it
The original 1980s kitchen has failing laminate counters, a tired soffit, and a layout that doesn’t work for the way you cook now.
What it costs in Los Serranos
A main house kitchen remodel in Los Serranos typically lands between $35,000 and $65,000 for a mid-range full gut, with high-end finishes pushing toward $90,000.
How we do it
We remove the soffit where framing allows, open the footprint, upgrade the ventilation for a high-fire-risk climate, and rebuild with materials that handle Inland Empire heat and dry air.
Garage Conversion Kitchen
Signs you need it
You’re converting an attached garage into an ADU and need a compact galley or L-shaped kitchen that meets County code for cooking facilities.
What it costs in Los Serranos
Kitchen work inside a Los Serranos garage conversion typically runs $18,000 to $30,000, more if the existing slab needs cutting for drain lines.
How we do it
We assess the slab, run the drain and supply lines where they need to go, and install a compact kitchen layout that keeps the egress and living space workable.
What Kitchen Remodeling Costs in Los Serranos
| Item | Typical range in Los Serranos |
|---|---|
| ADU kitchen build-out | $25,000 – $45,000 |
| Main house full kitchen remodel | $35,000 – $65,000 |
| Garage conversion kitchen | $18,000 – $30,000 |
How long does a kitchen remodel take in Los Serranos?
Most Los Serranos kitchen remodels run four to eight weeks from demo to finish. County inspections can add a week or two depending on inspector availability, and HOA design review, where applicable, happens before we start.
Will my Los Serranos kitchen remodel need County permits?
Yes. Since Los Serranos is unincorporated San Bernardino County, any kitchen work that moves plumbing, gas, or electrical goes through County Building and Safety. We pull the permits and schedule the inspections. Call (866) 251-7857 to get your project scoped.
Brands We Service in Los Serranos
We build and finish ADUs across the brand spectrum: Abodu, Cover, Tuff Shed, and traditional site-built. James Hardie fiber cement cladding is part of our standard exterior material set for Los Serranos fire-zone compliance. Parts and hardware are sourced locally from Inland Empire suppliers, which keeps lead times shorter than projects waiting on coastal distribution. See our brands for the full comparison.
Pricing for ADU Company in Los Serranos, CA
| Service | Typical range in Los Serranos |
|---|---|
| Detached ADU (site-built) | $165,000 – $225,000 |
| Garage conversion ADU | $95,000 – $140,000 |
| Prefab ADU (foundation + install) | $150,000 – $210,000 |
| ADU kitchen build-out | $25,000 – $45,000 |
| Main house full kitchen remodel | $35,000 – $65,000 |
| Garage conversion kitchen | $18,000 – $30,000 |
| ADU bathroom remodel | $15,000 – $35,000 |
| Main bath remodel | $18,000 – $40,000 |
Prices in Los Serranos push upward when a lot has septic or well systems that need re-routing, when HOA design review lengthens the front end, or when grading and drainage review on former equestrian pads adds engineering. We quote fixed pricing with no change orders unless you change the scope.
Neighborhoods We Serve in Los Serranos
We work throughout 91709, including the hillside tracts south of the 71 and the foothill neighborhoods that back onto horse properties and open space. Response time across Los Serranos is typically same-week for estimates.
- Los Serranos foothills
- Chino Hills border areas
- Neighborhoods east of Pipeline Ave
- Equestrian-zoned lots along the washes
- Tract home communities off Butterfield Ranch Rd
Service Area – Cities Near Los Serranos
We also serve homeowners in Chino, CA, Yorba Linda, CA, Montclair, CA, and Pomona, CA. Each city has its own permit path, and we handle the differences so you don’t have to.
Serving Los Serranos, CA — Our Local Coverage Area
We’re based in the Los Serranos 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 Los Serranos
Yes. Los Serranos falls under San Bernardino County, so we pull County Building and Safety permits for ADU construction, kitchen remodels, and bath remodels. HOA design review, where it applies, runs alongside the County process.
In most cases, yes. We schedule estimates for Los Serranos homeowners within the same week, usually within a few business days. Call (866) 251-7857 and we’ll get you on the calendar.
We’re a state-licensed contractor and we carry insurance and bonding. Proof of coverage is available at contract signing, which is standard for HOA and County submittals in Los Serranos.
Foundry ADU Builders has served Los Serranos since 2018. From a kitchen build-out in a garage conversion to a full detached ADU with a finished interior, one contractor covers the whole job. Call (866) 251-7857 for a free estimate.
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 Los Serranos Customers Say
"Unit came out great and the tenant is happy. The timeline ran long, largely because of how slow the city was on plan check, though a couple of the delays were scheduling on their end."
— Holly Reed"Sound insulation between the unit and the main house is better than I expected. You genuinely cannot hear the tenant."
— Shannon Gallagher"Knew the local setback and parking rules cold, which saved us from designing something that would never have been approved."
— Marisol Delgado