ADU Company in Los Serranos, CA
Kitchen remodeling in Los Serranos means working with ranch-style and mid-century homes on larger, often sloped lots where San Bernardino County rules apply, not Chino Hills city codes. Westminster ADU Builders has served Los Serranos since 2016, and we’ve learned which older homes hide outdated wiring behind seventies cabinets and which newer tract kitchens just need better layout, not a gut job. We build both prefab and site-built ADUs, and we finish the kitchens inside them with the same crew. Call (833) 620-3521 to talk through what your Los Serranos kitchen could look like.
Why Los Serranos Homes Are Different
Los Serranos sits in unincorporated San Bernardino County territory, tucked against the rolling hills that border Chino Hills State Park. That one fact changes more than people expect. Permits come from the county, not the city of Chino Hills, and hillside grading reviews slow things down on sloped parcels. We routinely see homeowners who assumed Chino Hills rules applied, then discovered county setback and defensible-space requirements they hadn’t planned for.
The housing stock runs from 1960s ranch homes on half-acre lots to newer tract builds, with horse properties mixed in along the northern edge. Older kitchens here often have load-bearing walls that were never meant to come out, original galvanized plumbing, and electrical panels sized for a 100-amp world. Summers are hot and dry, and Santa Ana winds push fire-safety requirements on exterior finishes. When we plan a kitchen or an ADU in Los Serranos, we’re thinking about grading, fire-resistant siding, and cooling loads, not just cabinet layouts.
Our Main Los Serranos Services
Most Los Serranos homeowners call us about two things: adding an ADU to a large rear yard, and remodeling a bathroom or kitchen in a home that’s ready for an update.
ADU Builders in Los Serranos
Los Serranos lots are bigger than what you’ll find down in Chino or Pomona, which means detached ADUs usually fit, even with county setback rules. The catch is slope. Homes along the hillside edges often need grading plans and retaining walls before a foundation goes in, and that’s a different process from what flat-lot Chino Hills homeowners deal with. We walk every Los Serranos client through the county checklist first, then match the build method to the lot. See ADU Builders in Los Serranos for the full breakdown.
Bathroom Remodeling in Los Serranos
Older ranch homes in Los Serranos often have one bathroom with original cast-iron plumbing and a layout that worked in 1965. When we remodel, we address the water lines, venting, and subfloor before we pick tile. And because we also build ADUs, the same team can handle a bathroom in the new unit and a refresh in the main house without two contractors stepping on each other. Read more at Bathroom Remodeling in Los Serranos.
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 often comes down to two problems. Older ranch homes have kitchens that weren’t designed for how families cook now, with cramped layouts, too little counter space, and plumbing and electrical that predate modern appliances. Newer tract homes may have decent bones but cheap cabinets and awkward islands. Either way, the job has to account for county inspection requirements and hot summers that punish a poorly ventilated cook space.
We handle the full scope from design through finished tile and cabinet hardware. If you’re also adding an ADU, we can sequence both projects so the same crew builds the ADU and finishes its kitchen, then turns to the main house. That’s the kind of single-contractor coordination that keeps a Los Serranos project moving. For a fuller look at our process, see Kitchen Remodeling.
Full Kitchen Renovation
Signs you need it
Your Los Serranos kitchen has a layout that forces traffic through the cooking zone, cabinet boxes are delaminating from decades of heat and dry air, or the electrical panel can’t support a modern range and hood.
What it costs in Los Serranos
A full kitchen renovation in Los Serranos typically falls between $85,000 and $100,000, depending on whether walls move and how much plumbing and electrical gets replaced.
How we do it
We start with a site assessment and field measurements, then produce drawings, get county permits, demo to the studs, update plumbing and electrical, install drywall and flooring, and finish with cabinets, counters, appliances, and trim.
Cabinet Replacement and Countertop Upgrade
Signs you need it
Your cabinet boxes are sound but the doors are tired, or the counters are worn laminate or cracked tile that fights you every time you wipe them down.
What it costs in Los Serranos
Cabinet replacement and countertop work around Los Serranos generally runs $35,000 to $75,000, with the spread driven by cabinet construction, countertop material, and whether you’re changing the layout at all.
How we do it
We remove the old cabinet faces or boxes, adjust for new counter depths, install the new cabinets and counters, and reconnect the sink, faucet, and appliances with new shutoffs and supply lines.
What Kitchen Remodeling Costs in Los Serranos
| Item | Typical range in Los Serranos |
|---|---|
| Full kitchen renovation | $85,000 – $100,000 |
| Cabinet replacement and countertop upgrade | $35,000 – $75,000 |
| Kitchen work inside a new ADU | $30,000 – $45,000 |
Hillside homes in Los Serranos can push costs higher when kitchens sit on slab foundations that need trenching for new drain lines, or when county inspectors require panel upgrades with the remodel. Every quote we give is a written line-item number, and we don’t pad it with change orders later.
How long does a kitchen remodel take in Los Serranos?
Expect six to ten weeks for a full Los Serranos kitchen remodel once permits are issued. County permit review adds time, especially on hillside parcels with grading notes, so we file early.
Will the price change once work starts?
No, not unless you change the scope. We write fixed-price quotes after we’ve opened walls and confirmed what’s behind them. The number we agree on is the number you pay.
Brands We Service in Los Serranos
We work with a curated set of prefab brands including Cover, Dvele, and Boxabl, keeping familiar panels and hardware accessible for Los Serranos clients rather than pushing a single vendor. See our brands for the full lineup and what each one fits best.
Pricing for ADU Company in Los Serranos, CA
| Service | Typical range in Los Serranos |
|---|---|
| Full kitchen renovation | $85,000 – $100,000 |
| Cabinet replacement and countertop upgrade | $35,000 – $75,000 |
| Kitchen work inside a new ADU | $30,000 – $45,000 |
| Detached ADU (prefab) | $140,000 – $280,000 |
| Detached ADU (site-built) | $200,000 – $400,000 |
| Garage conversion ADU | $80,000 – $150,000 |
| Attached ADU addition | $120,000 – $250,000 |
| Foundation and grading (hillside lots) | $15,000 – $45,000 |
| Bathroom remodel (small to medium) | $18,000 – $35,000 |
| Bathroom remodel (full, larger) | $35,000 – $60,000 |
Sloped lots, county grading review, and fire-resistant siding requirements are the three biggest cost drivers we see in Los Serranos. You’ll get a fixed written quote before we start, and we don’t hit you with surprise change orders.
Neighborhoods We Serve in Los Serranos
We work throughout the Los Serranos side of the 91709 ZIP, from the horse-property streets along Pipeline Avenue up to the hillside parcels near the state park edge. Most of our crews reach any Los Serranos address within about thirty minutes from our Westminster base.
- Los Serranos ranch-home streets east of Pipeline
- Hillside parcels backing up to Chino Hills State Park
- Tract-home sections near the Chino Hills border
- Horse-property lots along the northern edge of 91709
- Sloped rear-yard lots throughout unincorporated Los Serranos
Service Area – Cities Near Los Serranos
We also serve homeowners in nearby Chino, CA, where flat-lot city permitting is a different animal from Los Serranos county review. We cover Yorba Linda, CA and Montclair, CA for clients on the county edges, and we’re in Pomona, CA regularly for older housing stock that needs the same careful planning. Call and we’ll confirm we cover your street before we schedule anything.
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 is unincorporated San Bernardino County, so we file with the county planning and building departments, not the city of Chino Hills. We handle the full permit package, and if grading review applies to your hillside lot, we manage that too.
Once your drawings are approved and permits are issued, we can usually break ground within a few weeks. The county review timeline varies, so we recommend starting the planning conversation early if you want work done this year. Call (833) 620-3521 and we’ll give you a straight schedule.
Some Los Serranos neighborhoods have HOAs with their own design-review step, and we’ve worked through those before. We’ll help you understand what your HOA requires for an ADU or exterior change, and we include that review time in the schedule so there are no surprises.
Ready to get real numbers for your Los Serranos project? Call Westminster ADU Builders at (833) 620-3521 for a free estimate and a written, fixed-price quote.
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
"The kitchenette layout he suggested made better use of the space than the one on our original sketch."
— Lisa Hayes"Knew the local setback and parking rules cold, which saved us from designing something that would never have been approved."
— Daniel Norris"Sound insulation between the unit and the main house is better than I expected. You genuinely cannot hear the tenant."
— Farah Hassan