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 Montclair
If you’re searching for a General Contractor who knows Montclair’s housing stock, you’re in the right place. Most homes here were built between the 1950s and 1970s, and remodels on these tract houses come with a specific set of challenges: aging wiring, original 2×4 framing, galvanized plumbing, and flat or low-pitch roofs that need real attention. We handle that. Timberline Contractors brings a single point of accountability to Montclair projects, whether you’re reworking a kitchen, adding a rear-yard ADU, or replacing a roof with GAF materials. Call (866) 253-5808 to schedule your free estimate, and we’ll walk the site together before you commit to anything.
The reality of working in Montclair is that every job is a retrofit. You’re not building on open land. You’re working inside walls that went up sixty or seventy years ago. That’s where we do our best work.
Why Timberline Contractors Is Montclair’s Preferred General Contractor Company
Homeowners in the 91763 zip code call us because we treat their walls like they might be hiding something. They usually are. Nelson Fung built Timberline Contractors around a simple rule: inspect first, price honestly, and put every change in writing before work continues. That rule carries through every kitchen remodel, bathroom renovation, and addition we build in Montclair.
Unlike contractors who quote a remodel off the original wall plans and hope for the best, we plan for what’s behind the drywall. Montclair’s postwar tract homes are predictable in one way: the electrical is usually cloth or aluminum, the framing is often undersized by today’s code, and the plumbing is galvanized and ready to fail. Any remodel that ignores those realities ends up costing more than the original quote. Ours don’t, because we build inspection-first allowances into the scope of work from day one. That’s what keeps our Montclair CWS service customers coming back for their next project.
Styles & brands we work with
Construction Company in Montclair
A construction company in Montclair is rarely breaking new ground. With the city fully built out, the work is remodel, addition, or tear-down and rebuild inside existing neighborhoods near the 10 freeway. That means wall framing, foundation ties, and rooflines all need to work within what’s already standing. For a home addition in Montclair, budget $45,000 – $130,000 depending on square footage, foundation work, and how much of the original structure remains. An ADU construction project runs $90,000 – $220,000, and a garage conversion lands between $30,000 and $80,000.
Home Additions and ADUs on Tight Lots
Montclair’s narrow postwar parcels make rear-yard additions a game of inches. Property-line setbacks and existing block-wall fences sit right where the new foundation needs to go, so we measure twice and survey before we ever pour concrete. If a project is running into setback issues on your lot, we’ll tell you at the estimate stage, not after the forms are set.
Garage Conversions with Existing Footings
Converting a garage means working with the slab you have. Many of these older slabs weren’t poured to support living space, so we check for cracks, moisture intrusion, and flatwork issues before framing begins. If the slab won’t pass, we price the correction and get it approved in writing. No surprises.
Remodeling Contractor in Montclair
A remodeling contractor in Montclair needs to understand the difference between 1970s framing practices and current code. Most of the small stucco bungalows and single-story tract homes here were built before lateral load and shear requirements got serious. Open a wall and you’ll often find 2×4 studs doing work they should not be doing. Kitchen remodels in Montclair typically run $14,000 – $45,000, while bathrooms land between $9,000 and $28,000. A smaller kitchen refresh starts around $9,000, and a small bathroom remodel starts near $5,000.
Interior Work That Triggers Code Upgrades
Here’s what actually happens: you open a wall to move a sink or add an island, and the inspector notices the wiring behind it no longer meets current code. Now the electrical rough-in becomes part of the job. We handle this by writing electrical and structural allowances into the remodel contract from the start. When we find something, you see a line-item change order with a dollar figure before we touch it. That’s the difference between a clean remodel and a spiral.
Flat Roof and Stucco Waterproofing
Montclair’s inland heat and Santa Ana winds stress flat and low-pitch roofs more than people expect. Failed waterproofing on a roof or exterior stucco shows up as water stains inside walls, and by then the damage is already in the substrate. We plastic-line and detail every exterior surface we touch, because fixing a roof leak inside a finished remodel is the most expensive way to learn that lesson. Roof replacement in Montclair runs $8,000 – $20,000, and roof repair costs $400 – $1,800.
Trusted Brands We Service in Montclair
We’re not a single-brand shop. Timberline Contractors brings a curated roster of 50-plus manufacturers to every Montclair project, so your material choices are real choices. That means Cambria or Silestone quartz for the kitchen counters, James Hardie fiber-cement siding for the exterior, GAF or CertainTeed roofing overhead, and hardscaping from Unilock or Techo-Bloc in the yard. Whether you want performance-grade materials like Quikrete or premium finishes like Toto and Grohe in the bath, we carry the same project relationship either way. You pick the tier; we handle the installation to manufacturer spec. No juggling 5 different specialty trades, and no “limited catalog” where every job looks the same.
See the difference
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After
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After
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AfterCommon General Contractor Problems We See in Montclair Homes
- Undersized load-bearing framing. On a small postwar tract house off the 10 freeway corridor, our crew opened a kitchen wall for a remodel and found framing that no longer met current code. We stopped, pulled the permits, and priced the structural fix as a written change order before touching anything else. The homeowner saw every surprise and its cost before the drywall went back up.
- Aging cloth or aluminum wiring. A 1960s house in Montclair often has wiring that wasn’t designed for today’s appliance loads. Once walls are open, inspectors will flag it, and that triggers an electrical rough-in update. We build that possibility into the allowance from the first estimate.
- Rear-yard additions hitting setbacks. Narrow lots mean existing block-wall fences and property lines sit right where the foundation wants to go. We survey and measure before we price, so the quote reflects what the lot can actually support.
- Failed waterproofing on flat roofs and stucco. Hot inland summers and Santa Ana winds push membrane failures into visible damage. By the time you see a stain on the ceiling, the repair is bigger. We plastic-line and detail every exterior connection to prevent the problem from recurring.
Pricing for General Contractor in Montclair, CA
Here are the line-item ranges we quote most often in the 91763 zip code. These reflect Montclair’s existing-home conditions, not new-build costs. What moves the number on your project is what’s behind the walls. We’ll tell you at the estimate which end you’re on.
| Service | Typical Range in Montclair |
|---|---|
| Home Addition | $45,000 – $130,000 |
| ADU Construction | $90,000 – $220,000 |
| Garage Conversion | $30,000 – $80,000 |
| Kitchen Remodel | $14,000 – $45,000 |
| Bathroom Remodel | $9,000 – $28,000 |
Every estimate includes a written line-item breakdown, and permit costs are itemized separately so you can see exactly where your money goes. Call (866) 253-5808, and Nelson Fung or a project lead will walk the property with you before we send a number.
We Also Serve Cities Near Montclair
Timberline Contractors works across the Pomona Valley, including General Contractor in Montclair and its neighboring communities. We regularly take on projects in Claremont, Ontario, Upland, and La Verne. If you’re near the 10 freeway and planning work, the same inspection-first approach applies wherever the house is.
Serving Montclair, CA — Our Local Coverage Area
We’re based in the Montclair 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 Montclair
Because the walls hold Old Work. Original 1950s – 70s tract houses in Montclair were built before today’s electrical, structural, and plumbing codes. When we open a wall for a kitchen or bath remodel, we commonly find cloth or aluminum wiring, undersized framing, and galvanized pipes. If the project didn’t include an inspection allowance, every one of those shows up as an unpriced surprise mid-job. We write allowances into the contract so you see each discovery and its cost in writing before the work continues. Call (866) 253-5808 for a quote that accounts for this before the first wall is opened.
Yes. Any structural, electrical, plumbing, or mechanical work on a Montclair home requires a permit, and that includes most kitchen and bath remodels, additions, ADUs, and garage conversions. Working around the permit doesn’t save money; it creates liability down the road when you sell or file an insurance claim. We pull permits on every job and schedule the inspections. Call (866) 253-5808 if you want to know what your specific project triggers.
The setbacks. Montclair’s postwar lots were platted tight, and the property line or an existing block wall often sits within a few feet of where the new foundation needs to be. On a standard 50-foot-wide lot, a rear-yard ADU may need a variance or a reduced setback approval. We survey, measure, and price the project against the actual lot lines before you commit. The estimate reflects what the lot allows, not a generic “build it anywhere” plan.
We use allowances. An allowance is a written dollar amount set aside for a specific unknown, like electrical upgrades, framing repair, or plumbing replacement. When we open the wall and find the issue, we document it, attach a price from the allowance or a written change order, and you approve it before we proceed. Nothing happens without your signature. That’s the only honest way to bid on a Montclair remodel where the hidden conditions are predictable but not visible. Call (866) 253-5808 for a free estimate built this way.
Yes. The expansive and compacted clay soil under Montclair moves with seasonal moisture, and that movement puts stress on foundations, slabs, and any new structure you tie to the house. We check existing foundation cracks and slab conditions before designing an addition or ADU, and we price for proper soil compaction and rebar if the existing slab can’t support new living space. If your garage slab won’t pass, we’ll tell you before any framing begins. Call (866) 253-5808 to have your slab evaluated as part of the free estimate.
Written by Nelson Fung, Owner at Timberline Contractors, serving Montclair since the company’s beginning.