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 Costa Mesa
If you’re planning a remodel, addition, or ADU in Costa Mesa, you already know the hard part isn’t picking tile. It’s finding one contractor who can handle the whole job without you juggling four subs and a spreadsheet. Toolbox Contractors runs full-scope projects in Costa Mesa, from the Westside’s tight 5,000-square-foot lots to the ranch tracts east of the 405. One contract, one point of accountability, one team that shows up and owns the schedule. Call (855) 382-3257 and we’ll walk your lot before we ever hand you a number.
What most Costa Mesa homeowners discover fast: the quote is only as honest as the person who walked the site. We start there. Norm Castellano leads our team, and he’s the one you’ll talk to when the scope gets complicated, because in Costa Mesa it usually does.
Why Toolbox Contractors Is Costa Mesa’s Preferred General Contractor Company
Costa Mesa isn’t Irvine and it isn’t Huntington Beach. The housing stock is older, the lots are tighter, and the permit desk at Costa Mesa’s building department moves on its own timeline. We’ve worked enough projects here to know that a Westside bungalow on a 6,000-square-foot parcel doesn’t have room for a dumpster, a materials pile, and a crew truck all at once. That changes how you stage the job, and it changes the price. Contractors who quote off a brochure miss it. We don’t, because we walk every Costa Mesa lot before bidding.
Homeowners across 92627, 92626, and 92628 call us because we speak the language of the houses here. Slab-on-grade foundations from the 1950s. Knob-and-tube wiring hiding behind stucco. Shared walls on duplexes where your neighbor’s bedroom window looks right at your new second story. Those aren’t surprises to us. They’re the job. And when the Costa Mesa building department asks for structural calcs on an ADU that threads the property line, we’ve already got them queued.
We’re a General Contractor team that handles interior and exterior scope under one roof: kitchens, baths, roofs, windows, fences, hardscape, and ADU builds. You won’t get handed off to a sub you’ve never met who doesn’t answer texts. You get one crew, one schedule, one person to call.
Styles & brands we work with
General Contractor Services in Costa Mesa
General Contractor Services in Costa Mesa means something different than it does in a city with wide lots and new construction. Here, we’re threading square footage through properties that were never sized for it. A Westside homeowner planning a second-story addition on a 1950s bungalow typically pays $45,000 – $130,000 for the addition alone, and that number moves based on foundation condition, structural retrofits, and how much demolition the existing slab demands before framing starts.
Room Additions and Second Stories
On Costa Mesa’s Westside, a room addition often means tearing a 700-square-foot bungalow back to the slab and rebuilding up. We coordinate structural engineering, party-wall notice, and the ADU scope with the city as one package. The draw schedule stays predictable because we priced the access problem up front, not as a change order three weeks in.
Kitchen and Bath Remodeling
We install KraftMaid and Wellborn cabinetry, Cambria and Caesarstone countertops, and Kohler or Moen fixtures. A full kitchen remodel in Costa Mesa runs $14,000 – $45,000, and a bath typically lands between $9,000 – $28,000. Those ranges assume we’re working inside the existing footprint. Once a wall moves, the permit scope and the number shift.
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.
Construction Company in Costa Mesa
Construction Company work in Costa Mesa breaks into two worlds. East of the 405 around Mesa Verde, it’s remodel-and-refresh on 1960s and 70s ranch tracts. West of it in 92627, it’s tear-down-rebuild, second-story additions, and ADU conversions on compact parcels where the old structure fights you on the way out. Both require a contractor who understands the building envelope, not just one trade. A roof replacement in Costa Mesa typically runs $8,000 – $20,000, and impact window installation can land between $8,000 – $25,000 depending on the opening count and product line.
ADU and Prefab Construction
Through our partnerships with Abodu, Dvele, Boxabl, and Plant Prefab, we offer ADU solutions most Costa Mesa contractors haven’t adapted to. An ADU build in Costa Mesa runs $90,000 – $220,000, and the wide range reflects site conditions: whether the lot has side-yard access, how close the existing structure sits to the line, and what the city requires for setbacks. On a Westside 5,000-square-foot parcel, those variables decide the number before finish selections ever enter the conversation.
Full-Scope Exterior Work
The same sun and salt air that make Costa Mesa pleasant year-round also bake and chalk stucco, degrade exterior wood, and push fence and deck replacements onto a steady cycle. We install James Hardie siding, GAF and CertainTeed roofing systems, PGT and CGI impact windows, and Master Halco or Jerith fencing. One contract covers it, inside and out.
Trusted Brands We Service in Costa Mesa
Costa Mesa homeowners recognize quality brands, and we stock and install the ones that hold up in this climate. Quikrete and Sakrete products show up constantly on Westside slab work, where the old concrete under a 1950s bungalow often needs repair or leveling before we rebuild. Oldcastle pavers and retaining wall systems fit the outdoor living projects we run in 92626 and 92627. And for ADU builds, Abodu’s prefab units let us move faster on lots where a traditional stick-built addition would choke on staging room. We keep turnaround tight for Costa Mesa customers because we’re not ordering from a distant distributor when the schedule is already tight.
See the difference
Before
After
Before
After
Before
AfterCommon General Contractor Problems We See in Costa Mesa Homes
- No staging area on a tight parcel. A 5,000-square-foot Westside lot with a house already on it leaves almost no room for materials, equipment, or a dumpster. If your contractor didn’t price curbside staging and a tight demo plan, the schedule slips by week two.
- Old slab-on-grade foundations under 1950s bungalows. Slab repair, leveling, and plumbing re-routes through concrete add cost and time before framing can start. Quoting the finish work without touching the slab is a fantasy bid.
- Knob-and-tube-era wiring behind stucco. On tear-down-rebuilds and second-story additions, the old electrical often can’t carry the new load. Rewiring to current code is part of the job, not an optional upgrade.
- Shared walls and neighbor windows. Duplex conversions and rebuilds near the lot line trigger party-wall notice, work-hour limits, and real coordination with the people next door. Skip that step and the permit desk hears about it.
Pricing for General Contractor in Costa Mesa, CA
Honest pricing starts with walking the lot. Here’s what Costa Mesa projects actually cost, based on the scope we see most often in this city:
| Project | Costa Mesa Price Range |
|---|---|
| Home Addition | $45,000 – $130,000 |
| ADU Construction | $90,000 – $220,000 |
| Garage Conversion | $30,000 – $80,000 |
A garage conversion in Costa Mesa typically lands between $30,000 – $80,000, and the spread reflects whether the existing slab and framing are reusable or whether we’re rebuilding the shell to meet current energy and structural code. A full ADU runs higher because the city reviews it as new residential square footage with its own setbacks, utilities, and parking considerations. Every estimate we give is free, in writing, and line-itemed so you can see exactly where the money goes. Call (855) 382-3257 to schedule yours.
We Also Serve Cities Near Costa Mesa
Our crews run projects across Costa Mesa and the surrounding cities: Newport Beach, Fountain Valley, Huntington Beach, and San Joaquin Hills. Coastal-adjacent permitting timelines and dense-lot access challenges follow the same pattern in all of them, so the way we plan a Costa Mesa job carries straight across the city line.
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 General Contractor in Costa Mesa
Because the lot itself is the constraint. On a 5,000 – 6,000-square-foot Westside parcel, there’s no room for a materials pile, a dumpster, and a crew truck at the same time, so we stage curbside, schedule deliveries in small batches, and coordinate demo around parking. The permit timeline at Costa Mesa’s building department also runs on coastal-adjacent review cycles, so an ADU that would sail through a bigger-lot inland city takes longer here. That’s not a hidden fee. It’s the real arithmetic of building on a dense grid with neighbors twelve feet away. Call (855) 382-3257 and we’ll walk your lot and show you the schedule math before you sign anything.
You need a written contract that names the scope, the material brands, the draw schedule, and the permit and inspection plan. Specifically for Costa Mesa, it should also document who handles party-wall notice on shared-wall properties and how staging will work on your parcel. If a contractor says they’ll figure it out on site, walk. Norm Castellano puts every one of those items in the agreement up front, so there’s no ambiguity when the building inspector shows up.
Yes. Costa Mesa’s building department requires permits for structural scope, second-story additions, and any ADU or garage conversion that changes the building envelope or adds residential square footage. We pull the permits, submit the plans, and stand with you through inspection sign-off. Unpermitted work doesn’t just risk a stop-work order here; it complicates your resale disclosure on a house where lot-line and density questions already get extra scrutiny.
It changes the staging plan, the work-hour schedule, and sometimes the structural approach. On a Westside duplex or a rebuild near the lot line, we post party-wall notice before framing or stucco work starts, schedule noisy demo during allowed hours, and design the new second story so a neighbor’s existing window doesn’t end up staring into your new wall or vice versa. Those aren’t courtesies. They’re the difference between a clean inspection sign-off and a dispute that lands on your desk mid-project.
With a daily clean-up protocol and a staging plan that assumes there’s no on-site room in the first place. We stage materials curbside in sequence, schedule demo debris pickup the same week it’s generated, and sweep the sidewalk at the end of every day. On tight 92627 lots, the street is part of the job site, and keeping it tidy is how we stay welcome on blocks where three other trades are working the same month. Call (855) 382-3257 for a free estimate and a staging plan specific to your street.
Written by Norm Castellano, Owner at Toolbox Contractors, serving Costa Mesa and the surrounding cities with full-scope general contracting.