Kitchen remodeling
Bathroom remodeling
Home additions & ADU
Roofing
Windows & doors
Driveway & pavers
FenceFree written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Fast, Reliable General Contractor Across Los Serranos
Los Serranos sits at the far eastern edge of Chino Hills, backed against Carbon Canyon and Chino Hills State Park. That location changes how construction gets done. Hillside grading, county permits, well and septic setbacks, and wildland fire codes all shape what a general contractor can do here, and how fast. Sycamore Contractors works on Los Serranos acreage every month, and we know the difference between a city lot in Chino and a horse property off Carbon Canyon Road. If you’re planning a kitchen remodel, an ADU, a shop, or a full home addition in the 91709 zip, call (877) 265-6284 and we’ll walk your property before you commit to anything.
Why Sycamore Contractors Is Los Serranos’s Preferred General Contractor Company
Most Los Serranos projects start with questions the client hasn’t thought to ask yet. Do I pull permits through the county or the city? Will the fire marshal need to sign off on my outbuilding location? Is my septic drain field in the way of the addition I planned? Those are the questions that decide whether a project runs six weeks or six months, and they’re not questions a flatland contractor from Ontario thinks to raise. We do, because we’ve worked enough parcels here to know the rhythm of county plan review and the quirks of the 91709 building stock.
Our Los Serranos clients tend to own acreage: large-lot custom homes, older ranch properties with outbuildings, equestrian parcels, and hillside lots where the driveway looks more like a switchback than an approach. That means material hauls matter, equipment access matters, and sequencing matters. We plan for all of it before we quote, not after we start. One contract, one point of contact, and a draw schedule you can actually follow. You won’t be coordinating a grading crew from one company, a septic contractor from another, and a framer from a third.
Styles & brands we work with
Licensed General Contractor in Los Serranos
A licensed general contractor in Los Serranos is someone who carries the responsibility for the whole job: permits, trade coordination, material procurement, schedule, inspections, and the final sign-off. On Los Serranos acreage, that responsibility includes things you won’t see on a standard city job. County permitting through San Bernardino County takes longer than most homeowners expect, particularly when wells and septic systems are involved. A detached ADU on a lot with no sewer needs the septic system sited to county setbacks from the well, property lines, and drainage paths before framing can even begin. We handle that pre-construction work, so you don’t learn about it halfway through the project.
County Permits and Setback Compliance
In Los Serranos, many parcels are unincorporated or fall under county review rather than City of Chino Hills jurisdiction. That means plan check often includes San Bernardino County Environmental Health for septic and well clearance, plus WUI fire code review from the fire authority having jurisdiction. Those reviews add time. We build that timeline into the quote rather than letting it surprise you later.
Outbuildings, Shops, and Detached ADUs
A detached ADU on rural acreage in Los Serranos typically runs $90,000 to $220,000 depending on size, utilities, septic requirements, and site access. A shop or outbuilding follows similar siting rules: fire-defensible-space clearance, slope drainage, and material access all affect where it can sit and what it costs to build.
Residential General Contractor in Los Serranos
A residential general contractor in Los Serranos handles the scope from the roofline down to the driveway: kitchen and bath remodels, room additions, garage conversions, hardscaping, roofing, windows, fencing, and accessory structures. Los Serranos homes are a mix of newer large-lot custom builds, older ranch-style houses with equestrian outbuildings, and scattered rural parcels with substantial acreage. That mix means almost no two jobs are alike. A bathroom remodel in a 1970s ranch off Eucalyptus Avenue hits different existing conditions than a kitchen addition on a hillside custom home backing up to the state park.
Full-Scope Remodeling on Acreage
A whole home remodel in Los Serranos often includes exterior work because the property itself functions as part of the living space. Patios, retaining walls, driveway access, and outbuilding repairs all matter. We bring one accountable team across all of it. No subcontractor roulette, no gaps between trades.
Additions and Garage Conversions
A home addition in Los Serranos runs roughly $45,000 to $130,000, while a garage conversion lands between $30,000 and $80,000. The wide ranges reflect real site variables: slope, access, existing foundation condition, septic constraints, and whether the county requires survey updates before permit approval. We scope all of that before we quote, so the number you hear is the number you can plan around.
Trusted Brands We Service in Los Serranos
We bring real material choices to Los Serranos jobs, not whatever’s left on the shelf at the local yard. That means Cambria, Silestone, and Caesarstone for countertops; KraftMaid and Wellborn for cabinets; Kohler, Moen, and Toto for plumbing; GAF, CertainTeed, and Owens Corning for roofing; PGT and Therma-Tru for windows and doors; Belgard and Techo-Bloc for hardscaping. For detached structures and prefab ADUs, we work with Abodu and Cover, which shortens site time on lots where access is tight and weather windows are short. Quikrete and Sakrete products show up regularly on our retaining wall and drainage jobs here, because slope work in this part of Chino Hills demands materials that can handle steep grades.
See the difference
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After
Before
After
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AfterCommon General Contractor Problems We See in Los Serranos Homes
- County permitting timelines surprise the homeowner. San Bernardino County plan review for well and septic clearances on acreage takes weeks longer than city permit review, and homeowners who didn’t plan for it lose an entire season. We build that review period into the schedule from day one.
- WUI fire code forces plan revisions. Outbuildings, ADUs, and additions on parcels backing onto Chino Hills State Park have to meet defensible-space and ignition-resistance requirements. Siting changes late in design add cost. We flag it at the site-walk stage, before drawings are finalized.
- Steep driveways and narrow access complicate material delivery. Long hauls up Carbon Canyon Road or across rural parcels with switchback driveways mean deliveries arrive in stages, not all at once. We sequence carefully with suppliers so trades aren’t waiting on materials.
- Slope drainage gets ignored until after the first big rain. Poor grading sends water toward foundations and outbuildings. On a hillside Los Serranos lot, drainage design belongs in the permit set, not as an afterthought once the landscape washes out.
Pricing for General Contractor in Los Serranos, CA
Here are honest, usable numbers for the work we do most often on Los Serranos acreage. These aren’t quotes; they’re the ranges real projects land in after factoring in site access, permit complexity, and scope. The biggest cost drivers here are slope, septic and well constraints, WUI compliance, and material haul distance, not square footage alone.
| Project Type | Typical Los Serranos Range |
|---|---|
| ADU Construction | $90,000 – $220,000 |
| Home Addition | $45,000 – $130,000 |
| Garage Conversion | $30,000 – $80,000 |
Every quote we provide is a written line-item estimate. No change orders without your sign-off, no vague allowances, and no surprises buried in the contract. Call (877) 265-6284 to schedule a free site walk. We’ll give you a number you can plan around.
We Also Serve Cities Near Los Serranos
Sycamore Contractors works across Chino, Yorba Linda, Montclair, and Pomona, supporting homeowners in Los Serranos and the surrounding communities. If you’re researching a major renovation, visit our General Contractor page to learn more about our full-scope remodeling approach.
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 General Contractor in Los Serranos
Most Los Serranos parcels fall under San Bernardino County jurisdiction, which means your ADU permit runs through the county rather than the City of Chino Hills. County plan review typically includes Environmental Health clearance for septic and well setbacks, and WUI fire code review if your parcel abuts open space. That process can add three to six weeks before construction starts. We’ll tell you which jurisdiction applies to your lot in the first site walk, and we’ll build the timeline into the quote. Call (877) 265-6284 if you want us to check your parcel before you file anything.
If your property backs onto Chino Hills State Park or sits within a wildland-urban interface zone, your addition or outbuilding has to meet defensible-space and exterior-materials requirements that flatland homes don’t face. That can include Class A roofing, ember-resistant vents, non-combustible siding like James Hardie fiber cement, and minimum brush-clearance distances around structures. Those requirements are non-negotiable and they can change where an ADU or shop can be sited. We design to them from the first drawing, which saves you the cost of a late plan revision. Call (877) 265-6284 to talk through your parcel’s specific constraints.
Sloped parcels in Los Serranos need grading and drainage designed into the permit set, not added after the fact. Expect contour grading to route surface water away from foundations, retaining walls where grade changes exceed a few feet, and drainage channels or swales that work with the natural slope rather than against it. On steeper lots, a grading plan and possibly a soils report become part of the county submittal. We handle that in-house with our own crews. Plan for drainage work to add material and labor cost on any hillside project. Call (877) 265-6284 for an honest site evaluation before you buy or build.
Yes. Detached shops, barns, storage buildings, and hobby structures are common on Los Serranos parcels, and we build them as part of our general contracting scope. The process mirrors an ADU in some ways: county permits, WUI setback compliance, septic and well clearance if utilities are involved, and grading for drainage. Material access matters more on outbuildings than most people expect, especially on equestrian properties where the build site sits far from the driveway. We’ll give you a range after a site walk. Call (877) 265-6284 to schedule it.
Access is a real cost driver in Los Serranos. Long driveways, steep switchbacks, and narrow rural roads mean deliveries have to be staged in smaller loads, and some equipment can’t reach the work area without additional handling. That adds mobilization time and labor hours compared to a standard city lot in Chino or Pomona. We account for it in the quote rather than absorbing it into a vague contingency. It’s one of the reasons our estimates include a site walk before you ever see a number. Call (877) 265-6284 to get your project scoped properly from the start.
Written by Nate Calloway, Owner at Sycamore Contractors, serving Los Serranos and the surrounding Chino Hills area.