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 Claremont
If you’re planning a remodel, addition, or full-home renovation in Claremont, you need a general contractor who understands what’s behind the walls of this city’s older homes. Square One Builders has worked extensively in Claremont’s historic districts, and we know what a 1920s Craftsman or mid-century ranch will throw at you once demo starts. Call (877) 688-9930 for a free estimate on your project.
We’re not a specialty trade company that only handles kitchens or only handles roofing. We’re a full-scope General Contractor team, which means one contract, one accountable team, and every system of your remodel managed from the ground up. For Claremont homeowners, that matters because the homes here demand more coordination, not less.
Why Square One Builders Is Claremont’s Preferred General Contractor Company
Claremont homeowners call us because we give straight answers about what a remodel will actually cost and what it will actually uncover. Brent Calloway built Square One Builders on a simple principle: inspect first, price honestly, and never surprise a homeowner with a change order they didn’t approve in writing. That approach matters more in Claremont than almost anywhere else in the Pomona Valley, because the housing stock here hides things.
Our reputation in Claremont is built on jobs near the Village, the Claremont Colleges, and the foothill neighborhoods along Mills Avenue and Indian Hill Boulevard. Homeowners in those areas consistently tell us the same thing: other contractors gave them a low number upfront and a stack of change orders later. We do the opposite. We write allowances into the contract for the issues we know are likely, and we price the unknowns honestly before we start.
We carry full general contractor licensing and insurance, and we coordinate with Claremont’s design review and historic preservation processes daily. That local familiarity isn’t a bonus. It’s the difference between a project that moves on schedule and one that stalls waiting for a permit that should have been pulled in week one.
Styles & brands we work with
Hire a General Contractor in Claremont
Hire a General Contractor in Claremont when your project touches more than one trade. A kitchen remodel that requires plumbing, electrical, drywall, and cabinetry isn’t a job for three separate crews working on their own schedules. It’s a job for one accountable team. That’s what we do. A typical kitchen remodel in Claremont runs $14,000 – $45,000 depending on scope, and a bathroom remodel runs $9,000 – $28,000. Home additions start around $45,000 and can reach $130,000 for larger builds.
Single-Contract Accountability
When you hire Square One Builders, you get every trade under one contract. We manage electrical, plumbing, framing, drywall, finish carpentry, tile, and paint. No calling three different subs to figure out who’s responsible for a delay. No finger-pointing. Your remodel, fully managed.
Design Review and Permitting Support
Claremont’s design review process is stricter than most surrounding cities. If your home is in a historic district or has protected heritage trees on the lot, expect additional reviews before demo can start. We handle that paperwork and those conversations for you, and we build the timeline for them into the project schedule from day one.
General Contractor Services in Claremont
General Contractor Services in Claremont span far more than interior remodels. We handle full kitchen and bathroom renovations, whole-home updates, room additions, ADU construction, roof replacement, window replacement, and exterior work like hardscaping and fencing. Because we coordinate every system under one roof, you’re not juggling a roofer, a window installer, and a cabinet supplier on your own.
Remodels, Additions, and ADUs
An ADU in Claremont typically costs $90,000 – $220,000. We’re authorized to work with prefabricated ADU partners including Abodu, Dvele, Boxabl, Mighty Buildings, and Plant Prefab. That gives Claremont homeowners an option most local remodelers can’t offer. A garage conversion runs $30,000 – $80,000.
Exterior Systems Under the Same Contract
Your roof, windows, and siding are part of the same house, and we treat them that way. Roof replacement in Claremont runs $8,000 – $20,000. Window replacement runs $4,500 – $15,000. We spec materials from GAF, CertainTeed, Owens Corning, and James Hardie, and we install them with the same accountability as everything else on the project.
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.
Trusted Brands We Service in Claremont
We work with 50+ vetted material brands across every home system. For roofing, we install CertainTeed, Owens Corning, and GAF. For siding, James Hardie fiber cement. For countertops, Cambria, Silestone, and Caesarstone. For plumbing fixtures, Kohler, Moen, and Grohe. We spec the right material for your project, not whatever happens to be on the shelf. We hold Claremont inventory on common fast-turn items, but most materials are ordered to spec for your project, and we manage lead times so you’re never waiting on a missing cabinet door.
See the difference
Before
After
Before
After
Before
AfterCommon General Contractor Problems We See in Claremont Homes
- Knob-and-tube wiring behind original walls. In Claremont’s 1920s Craftsman and Spanish Colonial homes, opening a wall for a kitchen remodel often reveals knob-and-tube wiring that hasn’t been touched in 80 years. A permit-triggered electrical upgrade is almost always required once it’s exposed, which changes the scope and the cost. We write an electrical allowance into every Claremont remodel contract for exactly this reason.
- Undersized framing that won’t support modern loads. Many Claremont bungalows were framed with 2×4 ceiling joists that were fine for 1940 fixtures but won’t carry today’s kitchen islands or recessed lighting layouts. A structural engineer’s inspection is usually required before we remove or modify those walls. We pause, get the sign-off, and write the change order in plain language before any framing gets touched.
- Heritage tree protection requirements. Claremont’s mature Coast Live Oaks are protected. If your project involves excavation, grading, or foundation work near one, you’ll need an arborist report and a tree protection plan submitted to the city. We coordinate that. Skipping it can stop a project dead for weeks.
- Historic district design review delays. Homes in Claremont’s historic districts near the Village and the Colleges can’t just get any window or exterior color. The city’s design review board has to approve exterior changes. We’ve submitted enough Claremont design review packages to know what gets approved and what gets kicked back, and we build that timeline into the schedule.
Pricing for General Contractor in Claremont, CA
Here’s what Claremont homeowners can expect to pay for the most common projects we handle:
| Project | Typical Claremont Range |
|---|---|
| Home Addition | $45,000 – $130,000 |
| Kitchen Remodel | $14,000 – $45,000 |
| Bathroom Remodel | $9,000 – $28,000 |
These ranges reflect what we see in Claremont’s older housing stock. A small kitchen remodel in a 1950s ranch north of Foothill Boulevard will land on the lower end. A full-gut kitchen in a 1920s bungalow near the Village, with knob-and-tube remediation and structural upgrades, will land on the higher end. We provide written line-item pricing before any work starts, and we never change the price without your written approval. Call (877) 688-9930 to schedule a free estimate.
We Also Serve Cities Near Claremont
Square One Builders serves Claremont and the surrounding Pomona Valley communities. We work regularly in Montclair, La Verne, Upland, and San Antonio Heights. If you’re in one of those cities and planning a remodel or addition, the same full-scope general contractor accountability applies. Call (877) 688-9930.
Serving Claremont, CA — Our Local Coverage Area
We’re based in the Claremont 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 Claremont
You should expect an extra layer of city review before any exterior changes are approved, and often before interior structural work begins. Claremont’s design review process applies to homes in the city’s historic districts, especially around the Village and the Claremont Colleges. The review focuses on preserving architectural character, which means your window styles, exterior materials, rooflines, and sometimes paint colors need city approval. We submit design review packages for Claremont homeowners regularly, and we build the review timeline into your project schedule so it doesn’t turn into a surprise delay. Call (877) 688-9930 and we’ll tell you upfront whether your address falls into a review district.
We price them as allowances written into your contract before demo starts, and we never proceed on a change order without your written approval. In Claremont specifically, we expect to find knob-and-tube wiring, cast-iron drain lines, and undersized framing once walls come down in older homes. On a 1923 Craftsman bungalow near the Claremont Colleges, our crew opened a kitchen wall and found knob-and-tube wiring and 2×4 ceiling joists that weren’t load-bearing for the planned island. We paused work, got a structural engineer’s inspection sign-off, and wrote a change order for sistered joists and a new electrical rough-in before proceeding. The homeowner approved the added cost in writing before we touched the framing. That’s how we handle every surprise.
Yes, in almost every case, and if the wall is load-bearing you’ll also need a structural engineer’s stamp before the city will issue the permit. Claremont follows California Building Code and adds its own design review layer for homes in historic districts. Removing a wall without a permit can create problems when you sell the home, and it can be unsafe. We pull all required permits and schedule the inspections. Call (877) 688-9930 if you’re thinking about opening up a floor plan and we’ll tell you what the specific process looks like for your house.
A realistic budget for a kitchen remodel in Claremont is $14,000 – $45,000, with smaller kitchens landing on the lower end and full-gut remodels with structural work landing on the higher end. The biggest cost drivers in Claremont are hidden conditions, not finishes. If your home was built before 1950 and still has original walls, budget for electrical remediation. If you’re moving walls, budget for an engineer’s report and possibly framing upgrades. We line-item every cost so you can see exactly where your money goes. Call (877) 688-9930 for a free estimate with a written scope of work.
We follow Claremont’s heritage tree ordinance, which means we bring in a certified arborist for any project involving excavation or grading near a protected tree, typically a mature Coast Live Oak. The arborist produces a tree protection plan, and we implement it: fencing at the drip line, no material storage inside the protected zone, and hand-digging where necessary. The plan gets submitted with the permit package. Skipping this step isn’t an option in Claremont, and doing it right keeps your project moving. Call (877) 688-9930 and we’ll walk you through what applies to your property.
Written by Brent Calloway, Owner at Square One Builders, serving Claremont and the Pomona Valley since 2010.