Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Fast, Reliable General Contractor Across Walnut
Walnut homeowners call us when the scope is real: a kitchen that’s too tight for the way your family cooks, a bathroom that needs a walk-in shower instead of a tub, or an addition that has to survive a hillside drainage review. We’re Mason Remodeling, and we’ve been general contracting since 2004 as part of the Threshold Group family of home-service companies. When you call (803) 680-2547, a live person answers and we schedule a time to walk your actual home, not a template. That matters in Walnut, where a 1989 two-story off Lemon Avenue and a hillside parcel above Snow Creek need completely different scopes and budgets. We know because we’ve built both.
Why Mason Remodeling Is Walnut’s Preferred General Contractor Company
We’re not the contractor who quotes a kitchen over the phone without seeing the subfloor. Walnut’s housing stock runs from late-1980s tract homes near Suzanne Park to custom hillside lots with retaining walls that dictate where an addition can sit. Our General Contractor team walks every site before a single number goes in writing.
Every crew member who comes to your Walnut home is background-checked and identity-verified under the Threshold Standard. You get their name and photo before the visit, and they arrive in a clean marked uniform with a photo ID badge at the door. You never open the door to a stranger.
Isaac Pruett leads our crews on the ground, and the system he’s built is simple: a written price before any work starts, a written guarantee with clear terms on every project, and a 365-Day Done Right Promise. If the work isn’t right within a year of completion, we make it right at no cost to you. That’s not a promotion. It’s the standard.
The 365-Day Done Right Promise has been part of our general contracting, bathroom remodeling, and whole-home remodel work since the beginning. Walnut homeowners who’ve had a previous contractor disappear after the final check tend to notice that.
Styles & brands we work with
General Contractor Services in Walnut
General Contractor Services in Walnut cover the full build: kitchens, baths, room additions, garage conversions, and whole-home remodels with permits pulled and inspections passed. In Walnut, the permit and the plan review are not formalities. Hillside parcels near the Snow Creek watershed routinely require grading, drainage, and hillside-retention review before an addition or ADU permit is issued. We handle that review. A kitchen remodel in Walnut runs $14,000 to $45,000, and a bathroom runs $9,000 to $28,000.
Kitchen and Bath Remodels
A Walnut kitchen remodel often starts with what’s behind the drywall. In the 1980s tract builds, we regularly find original 4-inch subfloors that a previous tile job already cut down. The fixture and finish choices come later; the structure comes first.
Bathrooms go faster when the footprint stays. A tub-to-shower conversion in Walnut runs $3,500 to $10,000, and a walk-in shower install runs $4,500 to $12,000. We price the exact scope in writing before work starts.
Room Additions and ADUs
A home addition in Walnut runs $45,000 to $130,000, and an ADU runs $90,000 to $220,000. The range is wide because the site drives it: hillside grading, drainage, retaining walls, and plan-review timelines all move the number. We scope the actual parcel.
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.
Construction Company in Walnut
As a Construction Company in Walnut, we take the project from permit to final walkthrough, and we do it with a written scope that doesn’t drift. Walnut’s mix of 1980s tract housing and hillside custom lots means rough-in condition, subfloor thickness, and load-bearing layout vary lot to lot. A template bid from a copy-paste contractor is a change order factory. We don’t bid templates.
That’s why we walk the home before pricing. A garage conversion in Walnut runs $30,000 to $80,000. Whether it lands at the low or high end depends on whether the slab is sound, whether the electrical service can carry the new load, and whether the driveway access works. We tell you what we see.
Whole Home Remodels
A whole-home remodel ties kitchen, bath, finishes, and structural work into one permit and one schedule. In Walnut, that means coordinating the city’s plan check with your engineer, your designer, and our crews. We’ve handled that coordination on projects from Creekside to the hills off Grand Avenue.
Driveway and Exterior Work
Driveway replacement in Walnut runs $5,000 to $14,000, and a paver driveway runs $7,000 to $18,000. Roof replacement runs $8,000 to $20,000 for asphalt shingle, and metal roof installation runs $15,000 to $40,000. If the exterior work is tied to an addition or ADU, we bid it as one package with one written price.
Trusted Brands We Service in Walnut
We spec what lasts. In Walnut, that means KraftMaid and Wellborn cabinetry, Cambria, Silestone, and Caesarstone surfaces, Kohler and Moen fixtures, GAF and CertainTeed roofing, and Belgard and Unilock hardscaping. Our material partnerships put professional-grade products on your project without you having to chase a showroom. When we priced the Creekside kitchen remodel, the KraftMaid cabinetry and Cambria island were written into the allowance from day one. That kept the change order list at two items. For Walnut homeowners considering a factory-built path, we’ve also worked with and installed systems from brands like Dvele and Cover. We know what those panels require on a Walnut hillside lot, and we’ll tell you straight if your parcel is a fit.
Common General Contractor Problems We See in Walnut Homes
- Verbal scope on cabinets, countertops, and finish fixtures. The three words that prevent most remodel disputes are “in writing.” In Walnut’s older housing stock, the first surprise is a rotten subfloor, a moved gas line, or an unknown load-bearing wall, and an unwritten scope turns that discovery into a fight.
- Skipping or under-budgeting the Walnut permit pull on hillside and addition work. Grading and drainage plan review adds weeks to the schedule. If it’s not in the timeline from the start, the owner is living through a surprise delay with no end date.
- Pricing from a copy-paste template instead of walking the home. Walnut’s lot-to-lot variation in rough-in condition and structural layout means a template bid is a change order generator. We’ve torn out enough 1980s subfloors to know which questions to ask on the walk.
- Change orders that appear after demo starts. The written price you get from us covers the scope we agreed to. If we find something behind the wall that wasn’t in the scope, we show you photos, explain the options, and put the new number in writing before anything changes.
See the difference
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AfterPricing for General Contractor in Walnut, CA
Real numbers for Walnut, so you can self-qualify before you call:
| Project | Typical Walnut Range |
|---|---|
| Kitchen Remodel | $14,000 – $45,000 |
| Bathroom Remodel | $9,000 – $28,000 |
| Home Addition | $45,000 – $130,000 |
| ADU Construction | $90,000 – $220,000 |
| Garage Conversion | $30,000 – $80,000 |
| Cabinet Installation | $4,000 – $13,000 |
| Countertop Installation | $2,000 – $6,500 |
| Walk-In Shower Installation | $4,500 – $12,000 |
| Roof Replacement | $8,000 – $20,000 |
What moves the number in Walnut: hillside grading and drainage review, the condition of the existing subfloor and rough-in, whether a wall is load-bearing, and the finish tier you select. We give you a written price before any work starts, not a verbal estimate that grows on the final bill. Call (803) 680-2547 for a free estimate and a line-item quote.
We Also Serve Cities Near Walnut
Our crews serve Walnut and the surrounding area, including Rowland Heights, Diamond Bar, La Puente, and West Covina. If your project sits on the line between two jurisdictions, we’ll sort the permit and inspection requirements for the correct city. Call (803) 680-2547 and we’ll figure out where your address falls.
Serving Walnut, CA - Our Local Coverage Area
We’re based in the Walnut 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 Walnut
Yes, if you’re moving plumbing, electrical, or walls, you need a permit, and the City of Walnut will inspect the work before the walls close up. In the 1980s tract homes, we most often pull permits for kitchen re-roughs, bath layout changes, and load-bearing wall work. We pull the permits and schedule the inspections as part of every project. Call (803) 680-2547 to talk through your specific scope.
A kitchen remodel in Walnut typically runs $14,000 to $45,000, with small kitchens starting around $9,000 and full gut renovations landing at the top of the range. What drives the price is whether walls move, whether the subfloor gets replaced, and which cabinet and counter lines you choose. We give you a written line-item price before work starts. Call (803) 680-2547 for an exact quote.
Walnut’s hillside parcels near the Snow Creek watershed routinely require grading, drainage, and hillside-retention review before a permit is issued, and that plan review adds weeks and engineering cost to the project. The retaining walls and slope conditions on these lots also add to the structural scope. We include the review time and engineering in our written price so the schedule doesn’t surprise you. Call (803) 680-2547 to get a real number for your parcel.
Get every allowance in writing before work starts, and get every change order in writing before the work changes. In Walnut’s older homes, the first discovery behind the drywall is usually a structural or rough-in issue, and an unwritten scope is where disputes start. We structure payments on a written draw schedule tied to permit milestones and inspections, and every change order is priced in writing before we do the work. Call (803) 680-2547 and we’ll walk you through how that looks on paper.
A full bathroom remodel in Walnut typically takes three to six weeks from demo to final inspection, depending on whether you’re moving plumbing, changing the footprint, or doing a tub-to-shower conversion. The City of Walnut inspection schedule is part of the timeline, and we build our schedule around it. We’ll give you a written calendar with the estimate. Call (803) 680-2547 to get started.
Get a Written Price Before Your Walnut Project Starts
We scoped a full kitchen remodel off a 1989 two-story in the Creekside neighborhood near Snow Creek Park. The original 4-inch subfloor had been cut down for a previous tile job, and the peninsula wall was load-bearing. Our crew pulled the Walnut building permit, framed and re-roughed the wall, set KraftMaid cabinetry, and topped it with a Cambria island, holding the client’s written allowances so the change order list stayed at two items. The final walkthrough punch list closed in one visit after inspection sign-off on the electrical rough-in.
That’s how we build in Walnut: walk the home, scope the real condition, put the price in writing, and hold the schedule. Call (803) 680-2547 to schedule your free estimate. A live person answers, and you’ll get a real date, not a voicemail tree.
Written by Isaac Pruett, Owner at Mason Remodeling, serving Walnut since 2004.
