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
Trusted General Contractor for Corona Homeowners
Finding a general contractor in Corona who can actually manage a whole remodel, from the roof to the pavers, without you coordinating five different crews, is harder than it should be. Most contractors specialize in one trade and subcontract the rest, which means you end up as the project manager. At Square One Builders, Brent Calloway and our team run full-scope remodels under one contract, one schedule, and one point of accountability. We’ve built our reputation in Corona on kitchens, bathrooms, additions, roofing, windows, and ADUs where the homeowner never has to chase down a subcontractor. If you’re planning a significant renovation, call (877) 688-9930 and we’ll walk the project with you and give you straight answers on scope, cost, and timeline.
Construction Company
A Construction Company is the entity that actually performs the work on your home, not just a sales office that hands your project to a rotating cast of subs. In Corona, where much of the housing stock dates from the 1980s through early 2000s and now needs serious updating, you need a company with real crews and real accountability. Square One Builders operates as a licensed general contractor that self-performs structural and finish work while directly managing the specialists we bring in for mechanical and electrical scope. That means when something goes wrong, you call us, not a subcontractor’s voicemail. Typical full-scope remodels in Corona run $14,000 to $45,000 for kitchens and $9,000 to $28,000 for bathrooms, depending on material selections and whether we’re moving load-bearing walls.
One Contract, One Team
You don’t sign three contracts for a kitchen remodel. You sign one. We handle demolition, framing, drywall, cabinetry, countertops, plumbing fixtures, and lighting under a single scope of work. If a tile setter is late, that’s our problem to solve, not yours.
Vetted Subcontractor Network
For electrical, HVAC, and certain plumbing work, Corona code requires licensed specialists. We’ve worked with the same core group of tradespeople across Riverside County for years. They show up on schedule because they want our next job, which keeps your project moving.
Styles & brands we work with
Remodeling Contractor
A Remodeling Contractor handles renovations inside the existing footprint of your home, and the value in hiring one for a Corona property is knowing what that specific house can and can’t do. Many homes in South Corona and the Sierra Del Oro area have post-tension slab foundations, which affects where you can run new plumbing lines for a bathroom addition or kitchen island. Square One Builders approaches every remodel by looking at what the structure allows before we talk finishes. Bathroom remodels in Corona typically run $9,000 to $28,000, tub-to-shower conversions $3,500 to $10,000, and cabinet installation $4,000 to $13,000. We spec materials from brands like KraftMaid, Cambria, and Kohler because they hold up in our climate and keep parts available for decades.
Kitchen and Bath Systems
A kitchen remodel is not just cabinets and counters. It’s plumbing rough-in, electrical for appliance circuits, ventilation, and flooring. We coordinate all of it, including the stuff behind the walls you’ll never see but will absolutely notice if it’s done wrong.
Whole-Home Updates
When a Corona home needs a 2004-era kitchen, original bathrooms, and single-pane windows all addressed at once, we sequence the work so you’re not living in a construction zone longer than necessary. We phase projects the way a production builder would, which means materials arrive when the preceding trade finishes, not weeks early.
Licensed General Contractor
A Licensed General Contractor in California holds a CSLB-issued B license, which means they’ve passed trade, law, and business exams and maintain bond and workers’ comp insurance, as detailed in The Complete General Contractor Guide for Westminster Homeowners. That matters in Corona because the city requires permits and inspections for most structural, electrical, and plumbing work, and unlicensed operators cannot pull those permits. Square One Builders is a state-licensed general contractor, and we pull every permit our projects require before the first hammer swings. Home additions in Corona run $45,000 to $130,000 and garage conversions $30,000 to $80,000, and those are exactly the projects where permit compliance protects your resale value. If a contractor tells you a permit isn’t necessary on a project this size, get a second opinion.
Permit and Inspection Accountability
We schedule the inspections, meet the inspectors, and fix whatever they flag. You don’t stand in line at City Hall. When the final inspection passes, you get the signed card and closed permit, which is what appraisers and future buyers will ask for.
Bonded and Insured
Carrying a contractor’s bond and liability insurance is not optional for us because full-scope remodels involve real risk, from roof tear-offs to slab cuts. We can provide proof of coverage before you sign anything, and we encourage you to ask for it. Any licensed contractor who hesitates on that question should be crossed off your list.
Residential General Contractor
A Residential General Contractor focuses entirely on homes, not commercial storefronts or industrial buildings, and that focus matters more than most homeowners realize. Residential work means working around your family’s schedule, protecting finished floors and furniture, and sequencing dust-producing work so it doesn’t contaminate finish work. In Corona, where summer temperatures push past 100 degrees, it also means planning exterior work like roofing and stucco for cooler windows and protecting interior finishes from heat during cure times. Square One Builders works exclusively on residential projects. Window replacement in Corona runs $4,500 to $15,000, impact windows $8,000 to $25,000, and paver patios $3,500 to $11,000. We’re used to working in occupied homes and in homes where the homeowner is out of state for part of the build.
Occupied Home Remodels
You’re likely living in the house while we work on it. We set up dust barriers, run negative air where needed, and stage materials in a way that doesn’t block your driveway or garage. We communicate the noisy days in advance so you can plan around them.
Exterior and Interior Under One Roof
Most residential contractors pick a lane: inside or outside. We don’t. If your Corona home needs a new roof, new windows, a kitchen remodel, and a paver driveway, we can do all of it under one contract, sequenced so exterior work happens before the interior finishes go in.
Hire a General Contractor
You Hire a General Contractor when the scope of work touches multiple trades and you want one person accountable for the outcome, not a patchwork of independent subs. The alternative is being your own GC, which means pulling owner-builder permits, scheduling every trade yourself, and absorbing the cost of every mistake. In Corona, where many remodelers are really kitchen-only or roofing-only operators, finding a true general contractor is the difference between a project that runs six months and one that runs eighteen. Square One Builders gives you a written scope, a fixed price, and a schedule before we start. For reference, a paver driveway in Corona runs $7,000 to $18,000, concrete $4,500 to $12,000, and a new asphalt driveway $3,500 to $9,000. Those are the numbers you should see on a line-item estimate, not a round number with no breakdown.
Questions to Ask Before Signing
Ask to see their license, ask for references from Corona or nearby cities like Norco and Eastvale, and ask who specifically will be on site daily. If the person selling you the job won’t be the person running it, that’s a red flag. With us, Brent Calloway is involved from estimate through final walk.
Red Flags to Avoid
Door knockers with a “great deal on leftover material” from another job are running a classic scam in Riverside County. Huge deposits up front are another warning. Our payment schedule is tied to completed milestones, which protects you and keeps the project moving.
General Contractor Services
General Contractor Services in Corona span everything from structural framing and foundation work to finish carpentry, cabinetry, countertops, roofing, windows, siding, and hardscaping. What separates a true GC services provider from a remodeler with a sub list is the ability to self-perform the critical path work and directly manage the rest, which is why our General Contractor Maintenance Checklist for Westminster Homeowners emphasizes accountability. Square One Builders provides full-scope general contractor services, including ADU construction through partnerships with Abodu, Dvele, Boxabl, Mighty Buildings, and Plant Prefab. An ADU in Corona runs $90,000 to $220,000 depending on whether you go prefabricated or site-built. Roof replacement runs $8,000 to $20,000, and metal roofs $15,000 to $40,000. We spec GAF, CertainTeed, and Owens Corning because those manufacturers stand behind their products and our installers are certified with them.
ADU and Prefab Construction
Corona’s ADU regulations allow detached units on most single-family lots, and prefabricated construction dramatically shortens on-site build time. We’re authorized partners with Abodu and Plant Prefab, which means we handle the site work, foundation, utilities, and finishing while the factory builds the module. It’s a faster path to a rental unit or in-law suite. Our home page has more on that process.
Roofing Through Windows Through Pavers
One of the most wasteful things we see in Corona is a homeowner who does a kitchen remodel, then a year later does windows, then a year later replaces the roof. Each project pays mobilization costs and creates disruption. When we scope a home, we look at what’s aging together and present options for bundling that save real money.
What happens when you call
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A real person answersNo phone trees — you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Brands We Service
We install and service American Standard plumbing fixtures, and we’ve put them in enough Corona bathrooms to know exactly which tub and shower models fit standard 60-inch alcoves without reframing. If you’re replacing a 1990s fiberglass unit, an American Standard acrylic system gets you a clean, warrantied install without the cost of a custom tile shower.
For higher-end plumbing work we spec Toto toilets and bidet seats, particularly in master bathrooms where homeowners want the washlet integration done right the first time. And when a shower or tub surround needs waterproofing that will actually last, we use Schluter membrane systems rather than old-school cement board and RedGard. Whether you have American Standard, Toto, Sterling, or any other make, we can help you choose the right replacement or work with what you’ve got.
See the difference
Before
After
Before
After
Before
AfterSigns You Need a Pro Right Now
- Water stains on ceilings or around windows. In Corona, the winter rains expose roof and flashing failures fast. A small stain means water is already getting past your weather barrier, and by the time you see it, the sheathing underneath has been wet for a while. The longer it sits, the more likely you’re looking at framing repair on top of the roof or window replacement.
- Cracks wider than a quarter in drywall or stucco. Corona sits in a seismically active zone, and while hairline cracks are normal settling, anything wide enough to slide a coin into deserves a structural look. It could be slab movement, poor original framing, or water damage behind the wall. A general contractor can tell you whether it’s cosmetic or structural.
- Doors or windows that suddenly stick or won’t latch. When a door that closed fine for years suddenly rubs the jamb, the house is moving. It could be expansive soil under the slab, which is common in parts of Corona and Eastvale, or it could be a failing header. Either way, it’s a structural question, not a hardware problem.
- Your kitchen or bathroom is original to a pre-2000 home. The plumbing fixtures, cabinets, and countertops in a 25 to 40 year old Corona home are at the end of their service life. When the particle board cabinet boxes start swelling at the sink base, you’re not looking at a repair, you’re looking at the start of a full remodel. Planning ahead costs less than emergency replacement.
- You’re managing three different contractors for one project. If you’ve got a roofer, a window guy, and a kitchen remodeler all working around each other, you’re the general contractor and you’re not getting paid for it. Consolidating under one GC stops the finger-pointing and the schedule collisions.
Our Process, Step by Step
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Walkthrough and scope discussion. We start at your Corona home, walk every space you’re considering, and talk through what you want, what you’re willing to spend, and what condition the existing systems are in. This is a working meeting, not a sales pitch. Brent Calloway usually does these personally.
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Written scope and line-item estimate. Within a week, you get a document that breaks down every phase: demolition, framing, rough-in, finishes, and cleanup. No lump sums. If a line item doesn’t make sense, we explain it until it does. You’ll see brands named, not “cabinet – TBD.”
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Permit and material ordering. Once you approve the scope, we pull permits with the City of Corona and place material orders. On a kitchen or bathroom remodel, that means cabinets, countertops, and fixtures are ordered before demolition starts, so you’re not living with a gutted room for six weeks waiting on a backsplash tile.
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Construction and weekly updates. Work proceeds on the schedule we set, and you get a weekly update by phone or text, not a silent crew that shows up whenever. If a change order is needed because we found something unexpected behind a wall, you’ll know before we touch it and you’ll approve the cost in writing.
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Final walkthrough and closeout. We walk the finished project with you, fix anything that’s not right, and hand over the permit sign-off, material warranties, and a clean site. You get our direct contact for any questions in the months after, not a 1-800 number.
How Much Does General Contractor Cost in Corona?
The cost of hiring a general contractor in Corona depends almost entirely on scope. A small bathroom remodel runs $5,000 to $12,000, a full primary bath $9,000 to $28,000, and a full kitchen $14,000 to $45,000. Driveway work runs $3,500 to $18,000 depending on material, roof replacement $8,000 to $20,000, and a full home addition $45,000 to $130,000. For a detailed look at what goes into these numbers, see our General Contractor in Corona pricing breakdown.
What moves the price? Structural changes, material grade, and condition of what’s behind the walls. Moving a kitchen sink across the room means slab cutting and new drain lines, which is real money. Choosing Cambria over Silestone adds cost, choosing thermofoil cabinets over KraftMaid plywood boxes adds cost, and discovering rotted subfloor under a 1980s bathroom adds cost you can’t plan for until we open it up. The way to avoid overpaying is to get a line-item estimate and ask questions about every line. Our estimates are free, itemized, and we stand behind the numbers we give you. For homeowners in La Verne or El Cerrito Corona, the same pricing discipline applies.
Our Service Area Near Corona
Square One Builders works throughout Corona and the surrounding communities, including Norco, Eastvale, Montclair, Claremont, Ontario, Upland, Jurupa Valley, Rancho Cucamonga, and Home Gardens, and as a Midway City General Contractor we extend similar coverage to neighboring areas. We schedule estimates across the area within a few days, and our crews stage materials from local suppliers so we’re not stuck waiting on deliveries from Los Angeles. If you’re on the edge of our service area, call and ask. If we can’t get to you quickly, we’ll tell you straight rather than string you along.
Serving Corona, CA — Our Local Coverage Area
We’re based in the Corona area and know this community well. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
Frequently Asked Questions About General Contractor in Corona
A general contractor is the licensed professional who manages and executes a construction project, handling permits, scheduling, subcontractors, materials, and quality control under one contract. In Corona, a true general contractor like Square One Builders can handle structural work, roofing, windows, cabinetry, countertops, plumbing fixtures, and hardscaping without you hiring separate specialists. The GC is your single point of accountability for the entire job.
A bathroom remodel typically takes 3 to 6 weeks, a kitchen 6 to 10 weeks, and a full addition or ADU 3 to 8 months depending on permitting and prefabrication choices. Corona’s permit office has its own timelines, and prefab ADUs from partners like Abodu can cut site time significantly. We’ll give you a schedule before you sign, and we update it weekly as conditions change.
Cost depends on scope: kitchens run $14,000 to $45,000, bathrooms $9,000 to $28,000, driveways $3,500 to $18,000, roofs $8,000 to $20,000, and additions $45,000 to $130,000. Every project is different, which is why we write line-item estimates instead of ballpark quotes. Call (877) 688-9930 for a free estimate on your specific project.
Yes, we install and service Toto, American Standard, Sterling, and Schluter products, along with a full portfolio of 50+ brands across every home system. If you have a preferred brand for your Corona remodel, we’ll spec it and quote it. If you’re open to recommendations, we’ll point you toward the brands that hold up best in our climate and have parts available for decades.
For structural emergencies, roof leaks, or water intrusion, call us and we’ll assess the situation quickly. Full remodels are scheduled, but a failed roof or water-damaged wall can’t wait, and we make room for those projects. Call (877) 688-9930 and describe what’s happening, and we’ll tell you honestly whether it’s an emergency or something that can wait for a scheduled estimate.
We stand behind our craftsmanship, and the manufacturers we use, including GAF, CertainTeed, Owens Corning, James Hardie, and Cambria, provide their own product warranties. Specific warranty terms depend on the scope and materials, and we’ll put everything in writing before work starts. No vague promises, no fine print surprises.
Make a list of what bothers you about the space, what you’d change if budget weren’t a concern, and what you absolutely won’t compromise on. Have your budget range in mind, even if it’s broad, because that helps us spec the right materials rather than showing you a $45,000 kitchen when your number is $20,000. Clear the areas we’ll need to access, and be ready to talk honestly about how you use the space.
Schedule Your General Contractor Service in Corona Today
If you’re planning a remodel, addition, or ADU in Corona, the first step is a conversation. Call (877) 688-9930 and we’ll schedule a free walkthrough at your home, talk through your scope with Brent Calloway, and get you a written line-item estimate. No pressure, no obligation, just straight answers from a team that’s built from the ground up. One contractor, every system, your remodel fully managed.
Written by Brent Calloway, Owner at Square One Builders, serving Corona and surrounding Riverside County communities.