Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable General Contractor Across Sonoma
Hiring a General Contractor in Sonoma means finding someone who understands that this valley isn’t a typical suburban market. Between the post-2017 Nuns Fire rebuilds, the historic adobes near the plaza, and the vineyard estate properties climbing into the Mayacamas, every project here carries a different set of rules. Penhallow Remodeling works across all of it: builder-grade spec homes off East Napa Street, mid-century ranch houses on the flatlands, and rural parcels that need grading permits and fire-district sign-off before a hammer ever swings. If you’re planning a kitchen remodel, bathroom remodel, or whole-home renovation in Sonoma, call (936) 259-2607 for a written price before work starts. That’s how we operate, and it’s how you avoid the surprises this market is known for.
Why Penhallow Remodeling Is Sonoma’s Preferred General Contractor Company
Sonoma homeowners have been burned before, and we don’t mean by wildfire. A contractor gives a verbal estimate, demo day comes, and suddenly the number doubles. That doesn’t happen with us. Trevor Nash runs Penhallow Remodeling on a simple standard: the price you see in writing on day one is the price on the final invoice. If something fails inside the first year, our 365-Day Done Right Promise puts it back in writing: we return and fix it at no charge. No service call fee, no re-inspection fee, no argument.
Our crews serving Sonoma are background-checked and arrive in uniform. You’ll know exactly who’s walking through your door. And when you call at 6 a.m. or 9 p.m., a live person answers, not a voicemail maze. That matters when you’re three weeks into a permit review and need a straight answer. We’re part of the Kingswell family of companies, operating to The Kingswell Way since 2004; this location is independently owned and operated. We coordinate scheduling from our San Francisco Bay Area office, but the crew that shows up at your Sonoma home works locally and knows the valley.
General Contractor Services in Sonoma
General Contractor Services in Sonoma cover the full scope of residential remodeling: kitchens, bathrooms, whole-home renovations, room additions, and the structural and finish work that comes with them. A Sonoma homeowner typically calls us when a project requires permits, multiple trades, or coordination that a single specialty contractor can’t handle. That’s what a general contractor does: we pull the permits, schedule the trades in the right order, and make sure the work passes inspection the first time.
Kitchen and Bath Remodeling in Sonoma
Kitchen remodels in Sonoma run $14,000 – $45,000, and a small kitchen typically lands between $9,000 and $20,000. Bathroom remodels run $9,000 – $28,000, with small bathrooms at $5,000 – $12,000. We install KraftMaid and Wellborn cabinetry, Cambria, Silestone, and Caesarstone countertops, and Kohler and Moen fixtures because these brands carry warranties that stand alongside our own 365-Day Done Right Promise.
Whole-Home and Structural Work
Home additions in Sonoma run $45,000 – $130,000, and ADU construction runs $90,000 – $220,000. These are the projects where the pre-permit stack matters most, especially on hillside parcels. We’ll be honest with you about what the county, the fire district, and the biological resources review will require before we quote a start date.
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 Sonoma
As a Construction Company working throughout Sonoma, we handle the framing, structural, and building-envelope work that separates a cosmetic refresh from a real remodel. When a Sonoma homeowner opens a wall and finds builder-grade shortcuts, like a range hood rough-in vented into the attic instead of through the roof, that’s the moment a construction company with local experience earns its keep.
Structural Repairs and Building Envelope
Sonoma’s clay-heavy soils in lower-lying areas expand and contract with the wet, concentrated winter rains, and that puts unusual stress on slab-on-grade foundations. Before we pour, we bring in soil engineering. Before we side, we check what’s behind the stucco. For hillside parcels facing Diablo wind events in late summer, we detail exteriors to ignition-resistant standards: ember-resistant vents, Class A roofing, and defensible-space grading.
Builder-Grade Upgrades Without Voiding Warranties
On newer spec homes in Sonoma, we take a measured approach. You don’t need to rip out every window and door to get the kitchen you want. We’ll upgrade the cabinetry, countertops, and the primary bath, and leave the builder’s exterior package untouched so your builder warranty on those assemblies stays intact. If you’re unsure whether a planned change will void coverage, ask us before you sign anything.
Trusted Brands We Service in Sonoma
Sonoma homeowners often ask whether they can keep the products they already have, and the answer is usually yes. We service and install KraftMaid and Wellborn cabinetry, Cambria, Silestone, and Caesarstone countertops, and James Hardie siding alongside our own guarantee. On the modular and prefab side, we’ve worked around Abodu, Cover, and Dvele units that are increasingly common on Sonoma parcels, especially ADUs. We stock the fast-moving parts and finish materials locally for Sonoma jobs, which means less waiting on a truck from the East Bay when you’re mid-remodel. If you’re adding an ADU or converting a garage alongside the main house, we’ll coordinate the order so the finishes arrive when the framing is ready, not three weeks early.
Common General Contractor Problems We See in Sonoma Homes
- Builder-grade shortcuts that fail inspection. On a spec home off East Napa Street near the plaza, our crew pulled the kitchen wall and found the range hood rough-in vented into the attic instead of through the roof. That fails Sonoma County inspection sign-off, full stop. We corrected the venting to code and pulled the permits before finishing the kitchen.
- Hillside permit stacks that out-of-area contractors miss. Hillside parcels near the Sonoma Valley commonly require a Sonoma County grading permit, biological resources clearance for oak woodland and riparian setbacks, and Sonoma Valley Fire District defensible-space sign-off before a building permit can issue. Contractors who don’t know this quote a start date that won’t hold.
- Historic review near the plaza. Spanish Colonial adobes and Victorian-era cottages near the historic plaza fall under Sonoma’s historic preservation review. Exterior changes to windows, siding, or rooflines need approval that can add weeks. We factor that into the timeline from the first meeting.
- Verbal allowances that balloon after demo. The most common dispute in Sonoma remodels is an allowance left loose in a verbal estimate. We write the exact scope, the exact allowances, and the change order terms into your written price before any work starts. No “we’ll figure that out later.”
Pricing for General Contractor in Sonoma, CA
Here are the real numbers for the common first upgrades in Sonoma’s builder-grade and post-fire-rebuild housing stock. These ranges reflect what we see across the valley in 2025 and 2026, from Boyes Hot Springs up into the hills.
| Project | Typical Range in Sonoma |
|---|---|
| Kitchen Remodel | $14,000 – $45,000 |
| Small Kitchen Remodel | $9,000 – $20,000 |
| Bathroom Remodel | $9,000 – $28,000 |
| Cabinet Installation | $4,000 – $13,000 |
| Countertop Installation | $2,000 – $6,500 |
| Backsplash Installation | $800 – $2,500 |
| Kitchen Island Installation | $3,000 – $10,000 |
| Bathroom Vanity Installation | $800 – $3,000 |
| Walk-In Shower Installation | $4,500 – $12,000 |
| Window Replacement | $4,500 – $15,000 |
| Roof Replacement | $8,000 – $20,000 |
| Home Addition | $45,000 – $130,000 |
| ADU Construction | $90,000 – $220,000 |
What moves the number up or down: cabinet line and countertop material, whether we’re moving plumbing or leaving it where it is, and for exterior work, what the fire district and grading review require. Call (936) 259-2607 for a free estimate. We’ll give you a written number before any work starts, and that’s the number you’ll see on the invoice, not a ballpark with a “we’ll adjust later” asterisk.
We Also Serve Cities Near Sonoma
Penhallow Remodeling serves homeowners across General Contractor in Sonoma and the surrounding valley: Boyes Hot Springs, Petaluma, Novato, and Cotati. If you’re in a newer development in one of these towns and deciding between a cosmetic refresh and a full remodel, our General Contractor team will walk you through what to keep and what’s worth replacing, in writing, before you commit.
Serving Sonoma, CA - Our Local Coverage Area
We’re based in the Sonoma 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 Sonoma
No, not if the work is done correctly and the untouched assemblies stay untouched. If we replace cabinetry and countertops but keep the builder’s window package, exterior doors, and roof system as-is, those assemblies remain covered. What voids warranties is when a contractor cuts into structural elements, alters the building envelope, or rewires without pulling permits. We tell you before we touch anything whether a change risks your warranty, and we document the original condition so there’s no dispute later. Call (936) 259-2607 and we’ll walk your specific home.
Interior work like kitchen and bathroom remodels rarely triggers HOA review, but exterior changes almost always do. If your remodel touches windows, siding, rooflines, or the front elevation, check your development’s CC&Rs before you commit. We’ll help you fill out the architectural review application and schedule the work so the review doesn’t stall your start date. Some Sonoma developments also require HOA approval for construction hours and dumpster placement. If you’re unsure whether your project needs review, call (936) 259-2607 before you sign a contract.
The two rooms you use every day: the kitchen and the primary bath. In a builder-grade Sonoma home, the cabinets and countertops are usually the most visibly “spec” finishes, so that’s where you’ll feel the difference fastest. A small kitchen remodel runs $9,000 – $20,000. A primary bath with a walk-in shower runs $4,500 – $12,000. We’ll give you a written price for both before any work starts, and we’ll tell you honestly which one to do first if you can’t do both at once. Call (936) 259-2607 for a free estimate.
Yes, and this is where out-of-area contractors consistently miss the mark. Hillside parcels can require a Sonoma County grading permit, biological resources clearance for oak woodland and riparian setbacks, and Sonoma Valley Fire District defensible-space sign-off before a building permit can issue. That pre-permit stack can add weeks and real cost. We factor all of it into your written price and timeline from the first meeting, so you’re not surprised by a stop-work order. Call (936) 259-2607 to talk through your parcel.
A real estimate is a written line-item price you can hold us to. A guess is a verbal ballpark that changes at the door. In Sonoma, a kitchen remodel runs $14,000 – $45,000, a bathroom $9,000 – $28,000, and a home addition $45,000 – $130,000. Your written price will show the exact scope, the exact allowances for cabinetry and countertops, and the exact change order terms. No “we’ll figure that out later.” Call (936) 259-2607 for a free estimate, and we’ll put the number in writing before a single cabinet is pulled.
Written by Trevor Nash, Owner at Penhallow Remodeling, serving Sonoma and the surrounding valley.