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 Corona
Finding a General Contractor who actually understands Corona means knowing the difference between flat-lot tract work off the 91 and hillside builds in 92881 where fire-zone code rewrites the entire permit playbook. We’re Square One Builders, and we’ve been managing full-scope remodels, additions, and ADUs across Corona long enough to know that a quote that ignores soil conditions or fire-rated assembly requirements isn’t a quote, it’s a problem waiting to surface. If you’re planning a kitchen remodel near Grand Blvd, a home addition in 92880, or a major renovation in the foothills, call (877) 688-9930 and we’ll give you a straight answer.
Why Square One Builders Is Corona’s Preferred General Contractor Company
Corona homeowners keep calling us back because we treat every project like it’s the only one we’re running. That’s not a slogan. It’s how Brent Calloway built this company: one contract, one accountable team, and a scope of work that covers everything from the roof down to the pavers. Corona’s housing stock spans 1920s bungalows near 6th Street and brand-new master-planned tracts in 92880, so we’ve learned to spec materials and engineering for what each specific address actually needs, not what’s easiest to quote.
Our reputation in Corona comes from doing the unglamorous parts well. We pull permits, we schedule inspections, we document compliance for insurance carriers, and we don’t leave a homeowner guessing which trade is supposed to show up next. When you work with us, you’re getting one team that’s accountable for the whole build, not a loose collection of subs pointing fingers at each other. That’s the difference between a project that finishes and a project that stalls.
We answer our phones. When a Corona homeowner calls with a structural question or a change-order concern, they talk to someone who knows their project, not a call center. That matters when you’re three weeks into a kitchen remodel and the cabinet delivery shifts by a day. We’re in Westminster but we serve Corona every week, and we plan our project schedules around your timeline, not ours.
Styles & brands we work with
Residential General Contractor in Corona
A residential General Contractor in Corona handles the full scope of a home renovation or addition: structural work, roofing, windows, cabinetry, countertops, plumbing fixtures, siding, hardscaping, and every trade coordination in between. Corona homeowners call us when they’re planning a significant project, a kitchen remodel in an older South Corona home, a new ADU in 92880, or a whole-home update in the foothills, and they want one team accountable for the result. The job typically runs $45,000 to $130,000 for a home addition and $90,000 to $220,000 for an ADU, depending on scope, engineering, and the permitting path your specific lot requires.
Full-Scope Remodeling
When you hire us for a residential remodel in Corona, you’re hiring one contractor for every system: demo, framing, electrical, plumbing, roofing, windows, cabinetry, countertops, flooring, and finish work. We don’t hand you a list of subs to manage. We manage them. That’s the point.
Room Additions and ADUs
Corona’s newer tracts and foothill parcels are prime ADU territory, and we’re authorized to work with prefab partners like Abodu, Dvele, and Boxabl, as well as building custom stick-framed ADUs from the ground up. A room addition or ADU in Corona means engineering for your specific soil and slope conditions, fire-zone requirements if you’re in 92881 or 92883, and a permit path we’ve walked dozens of times.
Hire a General Contractor in Corona
When you hire a General Contractor in Corona, you should be hiring someone who knows that the city’s permit requirements change depending on which side of the 15 you’re on. Foothill parcels in 92881 and 92883 sit in a Very High Fire Hazard Severity Zone where exterior walls must be 1-hour fire-rated and roof coverings must carry a Class A rating. Flat-lot builders in 92880 work under standard Title 24 and no fire-zone construction requirements. Same trade, two permit playbooks, and we know both.
Fire-Zone Construction Compliance
Corona’s foothill parcels backing up to the Santa Ana Mountains face fire-zone review that flat-lot builds never touch. We handle Class A roofing, ember-resistant vents, fire-rated wall assemblies, and the documentation your insurance carrier will want to see. Skipping that review can fail inspection and void a claim after a wildfire. We don’t skip it.
Hillside Engineering and Drainage
Expansive clay soils and seasonal shrink-swell in Corona’s foothill neighborhoods mean foundation, retaining wall, and drainage work is a recurring local concern. On a hillside property off Foothill Parkway in 92881, our crew replaced a failing retaining wall and re-roofed a 1990s tract home with Class A asphalt shingles after the original 30-year roof was nearing the end of its life. We also upgraded the exterior wall sheathing to a 1-hour fire-rated assembly and added ember-resistant vents, then walked the homeowner through the inspection sign-off and documentation they’d need for their insurance carrier. The project passed fire-zone inspection on the first try, and the homeowner’s premium later dropped after they submitted the compliance paperwork.
Trusted Brands We Service in Corona
We spec the right material for your project, and in Corona that often means roofing and window products that meet fire-zone and wind-load requirements. We work extensively with GAF, CertainTeed, and Owens Corning roofing systems, so Class A fire-rated coverage is always an option we can install correctly. We also stock and order local parts for Corona customers, which means fewer multi-week lead times on common scopes. Your remodel, fully managed, with materials chosen for your specific lot, not for our supplier’s convenience.
See the difference
Before
After
Before
After
Before
AfterCommon General Contractor Problems We See in Corona Homes
- Skipped fire-zone permit review in the foothills. We regularly see 92881 and 92883 remodels where a previous contractor installed standard roof underlayment or non-rated vents, only for the work to fail inspection and complicate an insurance claim. A compliant quote includes Class A roofing and ember-resistant vents from day one.
- Flat-lot scopes applied to hillside lots. Quoting a flat-lot project for a parcel with expansive clay soils and slope drainage needs leads to change orders for retaining walls or caisson foundations mid-project. Corona’s foothill parcels require engineering that flat-lot 92880 builds simply don’t.
- Unpermitted structural work. Load-bearing wall removals or structural rough-in done without permits surfaces during resale and stalls draw schedules. We pull every permit and schedule every inspection, because documented compliance protects your investment and your insurance standing.
- Ignoring drainage on sloping lots. Corona’s foothill-edge properties need real slope drainage and grading plans. Without them, foundations crack and retaining walls fail. We design drainage into the scope from the start, not as a change order later.
Pricing for General Contractor in Corona, CA
We quote real numbers, not vague ranges designed to get a signature. Here’s what we’re seeing in Corona’s market right now:
| Project Type | Typical Range in Corona |
|---|---|
| Home Addition | $45,000 – $130,000 |
| ADU Construction | $90,000 – $220,000 |
| Roof Replacement | $8,000 – $20,000 |
| Impact Window Installation | $8,000 – $25,000 |
What moves the number? Slope and soil conditions, fire-zone requirements in the foothills, engineered retaining walls if your lot needs them, and the material tier you choose. A flat-lot ADU in 92880 prices differently than a hillside ADU in 92881, and we’ll show you exactly where the money goes. Call (877) 688-9930 for a free, written, line-item estimate. No change orders driven by surprise conditions, because we scope for Corona’s conditions up front.
We Also Serve Cities Near Corona
Square One Builders serves General Contractor in Corona and the surrounding communities including Home Gardens, El Cerrito Corona, Eastvale, and Norco. If your project sits in one of these areas, you get the same full-scope accountability and the same straight pricing. Call (877) 688-9930.
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.
FAQs About General Contractor in Corona
Class A. Corona’s Very High Fire Hazard Severity Zone in 92881 and 92883 requires roof coverings that carry a Class A fire rating, which means the roofing material itself has passed testing for severe fire exposure. GAF, CertainTeed, and Owens Corning all make Class A asphalt shingle products, and the assembly also needs ember-resistant vents and fire-rated underlayment. Call (877) 688-9930 and we’ll verify what your specific parcel requires.
Documented compliance with fire-zone construction standards can lower your premium, because insurers score wildfire risk by the age and rating of your roof, vents, and exterior wall assembly. After our Foothill Parkway project passed fire-zone inspection and the homeowner submitted the compliance paperwork, their premium dropped. We provide that documentation as part of the job.
Because hillside work in Corona carries engineering requirements that flat-lot builds don’t: expansive clay soil remediation, slope drainage design, retaining walls or caisson foundations, and fire-zone-rated assemblies and roofing. Those are real line items in the quote, not padding. We show you exactly where the difference sits.
A compliant quote for Corona includes permit fees, fire-zone plan review where your parcel requires it, Class A roofing and ember-resistant vents in the foothills, engineered soil and drainage work, and inspection scheduling. A cheap quote leaves all of that as a change order later. We line-item every one of those costs from the start, so the number you sign is the number you build to.
Yes. We handle the engineering letter, the permit application, the structural rough-in inspection, and the final sign-off for load-bearing wall removals anywhere in Corona, from the 92877 and 92878 core to the 92880 and 92883 edges. Unpermitted structural work surfaces during resale, so we never cut that corner. Call (877) 688-9930 for a free estimate and we’ll walk you through the exact steps for your project.
Written by Brent Calloway, Owner at Square One Builders, serving Corona and the Inland Empire since day one.