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
Remodeling Company in Costa Mesa, CA
Home renovation in Costa Mesa means working with a housing stock that was mostly built between 1950 and 1970, on lots that leave little room to spread out. Most of what we do here is gut remodels, additions, ADUs, and full-system replacements on occupied properties, not new construction. Square One Builders has served Costa Mesa since 2014, and we manage every part of that work under one contract, from the first tear-out to the final coat of paint. Call (877) 688-9930 to talk through your project.
Why Costa Mesa Homes Are Different
The 92626 and 92627 ZIP codes are dominated by single-story tract homes from the 1950s and 1960s on compact lots. When we open up walls on those streets, especially on the older Westside blocks, we routinely find original knob-and-tube wiring, galvanized or cast-iron plumbing that has outlived its useful life, and post-war slab-on-grade foundations that were never designed for today’s open floor plans. That changes the scope of nearly every remodel. What starts as a kitchen update often becomes a panel upgrade, a repipe, and structural reinforcement once the drywall comes down.
The climate works in our favor for scheduling. Costa Mesa’s mild, dry Mediterranean weather means we can sequence exterior work, roof tear-offs, and window replacements almost any month of the year without freeze-thaw delays. But the coastal marine layer and salt air near the 92627 side push us toward corrosion-resistant fasteners, stainless or coated hardware, and exterior detailing that can handle moisture. During Santa Ana wind season, we also adjust material choices for fire-conscious exterior ratings. None of this is theoretical. It is what we spec into Costa Mesa jobs every week.
Styles & brands we work with
Our Main Costa Mesa Services
Two services account for most of the calls we get from Costa Mesa homeowners. Both are covered in depth on their own pages.
General Contractor in Costa Mesa
Full-scope general contracting in Costa Mesa means coordinating structural work, roofing, windows, kitchens, bathrooms, and exterior systems under a single accountable team. On older Westside and 92627 homes, that often starts with correcting what previous decades left behind: undersized electrical services, failing cast-iron drain lines, and slab foundations that need reinforcement before a second story goes on. We manage the permit set, the subs, the inspections, and the schedule. General Contractor in Costa Mesa walks through the full scope and what to expect on a typical Costa Mesa lot.
Home Remodeling in Costa Mesa
Home remodeling in Costa Mesa is usually infill work on an active household, not a vacant build. That changes how we phase demolition, dust control, and daily site management. We sequence tear-out to keep one bathroom and one sleeping area usable as long as possible, and we coordinate material deliveries around tight driveways and street parking on compact lots. Home Remodeling in Costa Mesa covers the common project types, timeline expectations, and how we keep an occupied remodel running smoothly.
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.
Home Renovation in Costa Mesa
Home renovation in Costa Mesa is rarely a cosmetic refresh. The combination of 1950s and 1960s tract construction, compact infill lots, and decades of ad-hoc additions means most renovations involve correcting electrical, plumbing, and structural conditions once the walls are open. That is exactly the kind of full-scope job we are built for. Square One Builders coordinates every trade, every permit, and every material decision from the ground up, so you are not left managing four separate contractors and a building inspector. Our Home Renovation service covers everything from a single-room update to a whole-home rebuild.
Home Renovation Contractors
Signs you need it
You are planning to move or remove interior walls, replace multiple systems at once, or bring an older Costa Mesa tract home up to current code and floor-plan expectations.
What it costs in Costa Mesa
Whole-home renovation in Costa Mesa typically runs $14,000 to $45,000 for a kitchen and $9,000 to $28,000 for a bathroom, with full-home scopes scaling from there.
How we do it
We start with a site walk and a scope audit that flags likely buried conditions, then produce a fixed line-item estimate, a permit plan, and a phased schedule built around your household.
Home Improvement Contractors
Signs you need it
You have a growing list of smaller scopes, from cabinetry and countertops to vanities and windows, that keep getting pushed because no single contractor will take them all.
What it costs in Costa Mesa
Cabinet installation here runs $4,000 to $13,000, countertops $2,000 to $6,500, and window replacement $4,500 to $15,000 depending on the system.
How we do it
We bundle the scopes under one contract, sequence them so the house stays usable, and source materials from our 50-plus brand portfolio to match the price tier you want.
What Home Renovation Costs in Costa Mesa
| Item | Typical range in Costa Mesa |
|---|---|
| Kitchen remodel | $14,000 – $45,000 |
| Bathroom remodel | $9,000 – $28,000 |
| Home addition | $45,000 – $130,000 |
How long does a home renovation take in Costa Mesa?
Most Costa Mesa kitchen or bathroom renovations take 6 to 12 weeks depending on permit review, hidden conditions found at tear-out, and material lead times. We lock the schedule at contract so you know the phasing before we start.
Will the price change once you open the walls in a Costa Mesa house?
We write line-item allowances for known unknowns on older tract homes, and we walk the tear-out with you before any change order is issued. No change happens without your signed approval.
Brands We Service in Costa Mesa
We source and install from a portfolio of 50-plus nationally recognized brands, and we can pull materials from multiple tiers within each category. On Costa Mesa jobs we regularly spec James Hardie siding, GAF and CertainTeed roofing, KraftMaid cabinetry, Cambria and Silestone countertops, Kohler and Moen fixtures, and PGT windows. For ADU work, we are authorized to work with Abodu, Dvele, and Mighty Buildings. See our brands for the full lineup.
See the difference
Before
After
Before
After
Before
AfterPricing for Remodeling Company in Costa Mesa, CA
| Service | Typical range in Costa Mesa |
|---|---|
| Small kitchen remodel | $9,000 – $20,000 |
| Cabinet installation | $4,000 – $13,000 |
| Countertop installation | $2,000 – $6,500 |
| Backsplash installation | $800 – $2,500 |
| Walk-in shower installation | $4,500 – $12,000 |
| Tub-to-shower conversion | $3,500 – $10,000 |
| Bathroom vanity installation | $800 – $3,000 |
| Paver patio installation | $3,500 – $11,000 |
| Roof replacement | $8,000 – $20,000 |
| Window replacement | $4,500 – $15,000 |
| Vinyl fence installation | $3,500 – $9,000 |
| ADU construction | $90,000 – $220,000 |
Prices in Costa Mesa push toward the upper end when a job involves buried electrical or plumbing corrections on an older Westside or 92627 tract home, or when coastal exposure requires upgraded exterior hardware. We write fixed line-item quotes, so the number you approve is the number you pay barring a signed change order for something you approve in advance.
Neighborhoods We Serve in Costa Mesa
We work across Costa Mesa’s residential mix, from the postwar single-story tracts in 92626 to the older bungalow blocks and newer infill around 92627 and 92628. Our crews know the street parking constraints, the permit office rhythms, and the lot-line realities on both sides of the 55.
- Westside Costa Mesa
- Mesa Verde
- College Park
- Eastside Costa Mesa
- Halecrest
Service Area – Cities Near Costa Mesa
We also serve homeowners in the surrounding Orange County coastal and inland communities. For projects in Newport Beach, CA, Fountain Valley, CA, Huntington Beach, CA, or San Joaquin Hills, CA, we bring the same full-scope general contractor model and the same brand portfolio. Call (877) 688-9930 to schedule a walk-through anywhere in the area.
Serving Costa Mesa, CA — Our Local Coverage Area
We’re based in the Costa Mesa 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 Remodeling Company in Costa Mesa
Yes. Costa Mesa requires permits for structural changes, electrical and plumbing work, and most additions or ADUs. We pull the full permit set, coordinate inspections, and carry the job through final sign-off so you are not left with an unpermitted condition when you sell.
We typically schedule Costa Mesa remodels 3 to 6 weeks from contract signing, depending on material lead times and permit review. Coastal-adjacent review can add a week or two on certain 92627 jobs. We lock the start date at contract.
Yes. Most Costa Mesa lots are compact, so we design ADUs to fit within setbacks, lot coverage limits, and the city’s current ADU standards. We are authorized to work with Abodu, Dvele, and Mighty Buildings, and we manage the site work, utilities, and permit set.
Call Square One Builders at (877) 688-9930 for a free estimate on your Costa Mesa renovation.
What happens when you call
- 1A real person answersNo phone trees — talk to a local construction 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 Costa Mesa Customers Say
"Allowances in the contract were realistic rather than artificially low to make the bid look good."
— Colleen Bennett"The foundation survey came back dead on. Everything downstream of that being square is the reason the rest of the build went smoothly."
— Claudia Torres"Quality construction and a professional operation. Communication was strongest at the site meetings, and slower by email in between."
— Leela Singh