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 Home Remodeling Across Fullerton
Home remodeling in Fullerton means working with a housing stock that runs from 1920s Spanish Colonials in College Park to postwar ranch tracts off Commonwealth and mid-century apartments near Cal State Fullerton. Most of what we do here is not new construction. It is careful, phased renovation of older homes, plus second-story additions, garage conversions, and ADUs squeezed onto lots that were platted generations ago. Square One Builders runs one contract across every system of the job, from structural and roofing to cabinetry, countertops, plumbing fixtures, and windows. If you are planning a remodel in the 92832, 92833, 92834, or 92835 ZIP codes, call (877) 688-9930 and we will scope the work honestly before you commit to anything.
Why Square One Builders Is Fullerton’s Preferred Home Remodeling Company
Brent Calloway founded Square One Builders on a simple idea: one licensed general contractor should be accountable for every phase of a remodel, not a rotating cast of subs the homeowner has to chase. That matters more in Fullerton than in a master-planned city, because older homes here hide things. A 90-year-old cottage off the Chapman corridor can have original clay sewer laterals, a 60-amp panel, and lath-and-plaster walls. We scope for those possibilities before quoting, so the number we give you reflects the house you actually own.
Our clients in Fullerton tell us the same thing: they had talked to three contractors who each wanted to handle one trade, and nobody wanted to own the whole job. We take the opposite approach. One contract. One schedule. One team accountable from demolition to final paint. For a city where permits, setbacks, and historic review shape every job, that single point of accountability is the difference between a remodel that runs and one that stalls.
We are based in Westminster and work regularly across Fullerton neighborhoods including College Park, the downtown historic core, Sunny Hills, and the hillside acreage north of town. Our team knows which areas trigger Historic Preservation review, which lots fall under county permitting, and where sewer and panel upgrades become unavoidable scope items. That local knowledge gets baked into your estimate before you sign anything.
Styles & brands we work with
Luxury Home Remodeling in Fullerton
Luxury Home Remodeling in Fullerton usually means a whole-home transformation on a premium budget, often in the larger custom homes around Sunny Hills or the newer estates in the 92835 area. The job involves high-end material selection, custom millwork, upgraded mechanical systems, and finishes that hold up to a hot, dry inland climate. A typical kitchen remodel in Fullerton runs $14,000 – $45,000, while a full luxury-level spec can push well beyond that when you are specifying Cambria or Silestone surfaces, Kohler or Grohe fixtures, and custom cabinetry from KraftMaid or Wellborn.
Custom kitchen and bath upgrades
For a luxury kitchen, we often spec Caesarstone or Cambria counters, full-height backsplash, soft-close cabinetry, and a dedicated appliance circuit. In older Fullerton homes, that almost always means a panel upgrade, so we price the electrical work in the same scope as the cabinetry, not as a surprise line item later.
Luxury bathrooms in Fullerton homes frequently involve a walk-in shower conversion. That runs $4,500 – $12,000 depending on glass, tile, and valve upgrades. We keep the plumbing fixture selection broad, from Grohe and Toto at the premium end to Moen and Delta when the budget needs balance.
Whole-home executive finishes
When the remodel touches every room, we coordinate flooring, window replacement, interior doors, and paint under one schedule. Impact window installation in Fullerton runs $8,000 – $25,000 depending on the opening count, and many homeowners on the hillside edge choose it for fire defense as much as noise reduction. The point is that the whole package is scoped together, which is how a luxury remodel should be bought.
Full Home Remodel in Fullerton
A Full Home Remodel in Fullerton is the realistic path for most owners of pre-1960 single-family homes here, because the existing house has good bones but outdated systems. Roof replacement on an older Fullerton home runs $8,000 – $20,000, and kitchen and bath remodels start around $14,000 and $9,000 respectively. What makes Fullerton different is that most of this work is renovation of occupied homes, not ground-up builds, so sequence-of-construction matters as much as the tile selection.
Systems-first renovation
On an older block off the Commonwealth corridor, we typically open walls and find galvanized plumbing and early Romex that should not stay. Replumbing and rewiring are not glamorous, but they are the work that makes a remodel last. We price them in the scope from the start, because Fullerton homes of that era routinely need them.
Interior and exterior in one contract
Because we are a full-scope general contractor, a whole-home remodel can include roofing, siding, windows, and kitchen renovation under one signed scope. You do not hire a roofer, then a window company, then a cabinet installer. One Home Remodeling team manages the schedule so the house is not torn apart in three competing phases.
Trusted Brands We Service in Fullerton
We specify materials from a portfolio of 50+ manufacturers so Fullerton homeowners can match product tier to budget without switching contractors. For roofing, that includes GAF, CertainTeed, Owens Corning, and IKO. For cabinetry and counters, we work with KraftMaid, Wellborn, Cambria, and Silestone. The reason this matters: a hillside home in north Fullerton has very different fire-resistance and sun-exposure needs than a shaded bungalow downtown. We spec the right material for your project, not whatever the supply house has on the shelf. And because we service these brands regularly on Fullerton jobs, we know lead times and installation quirks going in.
See the difference
Before
After
Before
After
Before
AfterCommon Home Remodeling Problems We See in Fullerton Homes
- Undersized electrical panels on older homes. A 60-amp or 100-amp panel that was fine for a 1950s ranch cannot carry a modern kitchen, electric dryer, and a heat pump. Adding an ADU or second-story addition almost always forces a load calculation and a panel swap, so we put that in the initial scope.
- Original clay and cast-iron plumbing. College Park and downtown homes built before 1960 frequently still have clay sewer laterals and galvanized supply lines. A kitchen or bathroom remodel is the right moment to replace them, but it has to be priced, not discovered.
- Historic Preservation review on visible front elevations. In Fullerton’s historic districts, window style, roof pitch, and setbacks on the street-facing side can be dictated by the review board. We have done enough of these jobs to know what will fly before the drawings go in.
- Lath-and-plaster walls. Older Fullerton cottages and Spanish Colonials have plaster over wood lath, which changes demo cost, dust control, and how we run new wiring. It is just part of the house, and we scope it accordingly.
Pricing for Home Remodeling in Fullerton, CA
Fullerton pricing reflects an older housing stock and a built-out city where most work is renovation rather than new construction. Below are the market ranges we quote for the most common project types in Fullerton. These are honest ranges, not teaser numbers.
| Project | Typical Fullerton Range |
|---|---|
| Home Addition | $45,000 – $130,000 |
| ADU Construction | $90,000 – $220,000 |
| Garage Conversion | $30,000 – $80,000 |
| Kitchen Remodel | $14,000 – $45,000 |
| Bathroom Remodel | $9,000 – $28,000 |
| Roof Replacement | $8,000 – $20,000 |
| Impact Window Installation | $8,000 – $25,000 |
The difference between the low and high end of each range is driven by square footage, system condition, finish level, and whether the project triggers panel, sewer, or foundation work. Our free estimate includes a written line-item scope so you see exactly what is in the number before you sign. Call (877) 688-9930 to schedule yours.
We Also Serve Cities Near Fullerton
Our crews work regularly across the North Orange County corridor. If you are just outside the Fullerton boundary, we also provide Home Remodeling in Fullerton and the surrounding communities including Anaheim, La Habra, Placentia, and Brea. The same team, the same full-scope contract, the same straight answers.
Serving Fullerton, CA — Our Local Coverage Area
We’re based in the Fullerton 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 Home Remodeling in Fullerton
If your parcel falls outside the municipal boundary, on the hillside or Coyote Hills-adjacent land north of Fullerton proper, the structure is typically permitted through the county, not the City of Fullerton. That changes the entire scope conversation, because county approval brings septic and well setback requirements, grading and drainage review, and often a more involved site plan process. We run those checks before quoting, so your number reflects the actual jurisdiction, not an assumption. Call (877) 688-9930 and we will confirm jurisdiction for your specific parcel.
Because much of Fullerton’s housing stock was built when a 60-amp or 100-amp panel was standard. The moment you add square footage, a second kitchen, or an ADU, the load calculation almost always exceeds the old panel’s rating. It is not a code gray area; it is math. On an older College Park block off the Chapman corridor, our crew opened a 1920s Spanish Colonial cottage for a full home remodel and found a 60-amp panel plus original clay sewer laterals. Both had to be upgraded before the addition could carry load, and we wrote them into the scope as line items, not change orders.
In districts where the front elevation is visible to Historic Preservation review, the city can dictate window style, roof pitch, and setbacks on the street-facing side. That means a replacement window package is not just a thermal upgrade; it has to match the block. On that same Spanish Colonial, the historic-compliant window package and roof pitch were written into the scope before quoting, which is the only reason the concealed subfloor rot was the lone surprise.
Septic and well setbacks if the lot is county-permitted, panel and sewer scope on older homes, historic review constraints on visible elevations, and a grading and drainage plan if the lot is open or sloped. On a Fullerton acreage parcel with a detached shop or ADU, equipment access and long material hauls are real line items too. If any of those are missing from a quote, the gap becomes your change order after work starts. Our estimates are written line-item scopes for exactly that reason.
We walk the lot and look at existing drainage patterns, the slope toward any neighboring parcels, and where winter runoff actually goes. On an open acreage lot, we may need a swale, a retaining course, or a specific pad elevation for a detached structure. Those are scoped before the quote is final, not discovered in November. It costs you less to plan drainage in the estimate than to fix it after a rain.
Written by Brent Calloway, Owner at Square One Builders, serving Fullerton and North Orange County with full-scope home remodeling from the ground up.