Metal roofing
Architectural shingles
Tile roofing
GAF
Owens Corning
Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Fast, Reliable Roof Installation Across Westwood
A new roof in Westwood typically runs $14,000 to $38,000 depending on the material, the slope, and what we find when the old roof comes off. That’s a real range, not a teaser. The number changes most when a home has original 1920s clay tile on spaced sheathing, which fails current code and requires a structural decking upgrade before new roofing goes down. We’ve re-roofed homes from the flats near Wilshire up into the hills north of Sunset, and we know what Westwood’s housing stock demands. Call (213) 521-8272 for a written estimate before any work starts.
Why Mercer Roofing Co Los Angeles Is Westwood’s Preferred Roof Installation Company
Westwood homeowners call us because we do something most roofers won’t: we tell you exactly who’s coming to your door before the crew arrives. Every Mercer technician is background-checked, identity-verified, and dispatched under the Threshold Verified standard. Their name and photo come to you ahead of the visit, and they badge in with a photo ID at the door. For homeowners who are home alone, or parents with young children, or folks who simply don’t want a stranger walking their property unannounced, that detail matters more than any brochure line.
Grant Whitlock has built Mercer Roofing around a simple promise: a written price before work starts, every time, with no surprises on the invoice. That’s the 365-Day Done Right Promise in writing. If the work isn’t right within a year, we make it right. We also put a written guarantee on every repair and installation, and a free second visit is included if a repair fails. It’s not marketing language. It’s the contract.
Westwood’s housing stock runs from 1920s Spanish and Mediterranean styles with clay tile roofs to 1950s and 60s ranch homes with composition shingles, plus a lot of mid-century flat-roof additions. Our Roof Installation team has torn off and rebuilt roofs on nearly every one of those types. We know which ones hide rotten decking under old tile. We know which flat-roof tie-ins leak first. That local knowledge means our quotes account for the real work, not the optimistic version.
Styles & brands we work with
Roof Flashing Installation in Westwood
Roof flashing installation in Westwood is the difference between a roof that sheds water and a roof that leaks at every valley, wall, and penetration. Flashing is the metal, usually galvanized steel or aluminum, that seals the joints where the roof meets a chimney, a dormer, a skylight, or a wall. On Westwood’s older homes, we regularly find flashing that was patched with tar or caulk decades ago and has long since failed. A proper flashing install in Westwood runs $600 to $2,200 depending on how many penetrations and how much custom bending the home requires.
Flashings That Stop Leaks, Not Hide Them
On hillside lots, flashing gets punished. Santa Ana winds drive rain sideways under eaves and the flashing takes the brunt. We install step flashing on roof-to-wall intersections, counter-flashing at chimneys, and custom valley metal where two roof planes meet. Every piece gets sealed with compatible sealant and fastened with new hardware, never the weakened original fasteners.
Mid-Century Tie-In Repairs
Westwood’s mid-century homes often have flat-roof additions tied into sloped sections. The tie-in is where old torch-down meets shingle or tile, and it’s the first place water backs up during winter rains. We re-flash those tie-ins with custom metal that extends well past the seam, so water can’t work its way under the eaves. The fix usually runs $800 to $1,800 per tie-in.
TPO Roofing Installation in Westwood
TPO roofing installation in Westwood is the smart choice for flat and low-slope roofs, and this part of Los Angeles has plenty of them. TPO, or thermoplastic polyolefin, is a heat-welded single-ply membrane that reflects UV and stands up to pooled water far better than old torch-down. We install TPO on flat-roof additions, detached garages, workshops, and ADUs all over Westwood. A typical TPO install runs $9 to $14 per square foot installed, which puts a 500-square-foot flat roof between $4,500 and $7,000.
TPO for Additions and Outbuildings
Many Westwood homes have flat-roof additions that were built in the 1960s and 70s and are still wearing their original torch-down. That material eventually cracks and alligators under Southern California sun. TPO replaces it with a white, reflective membrane that drops attic temperatures and handles Westwood’s wet winters without leaking. Seams are heat-welded, not glued, which means they won’t separate the way taped or glued seams do.
Roof Decking Under TPO
Before any TPO goes down, we check the decking beneath it. Flat roofs on older Westwood homes often hide saturated plywood or OSB around scuppers and drains. We replace what’s soft, then install rigid insulation to give the roof a slight positive slope toward drainage. That’s the part cheap bids skip, and the part that determines whether the roof lasts ten years or thirty.
Trusted Brands We Service in Westwood
We install and repair roofs using manufacturer-recognized shingle and tile brands, including GAF, CertainTeed, Owens Corning, and Boral. Boral tile matters in Westwood because it matches the original clay tile on many 1920s and 30s Spanish homes. GAF and CertainTeed give us composition shingle options with strong wind ratings for the Santa Ana season. We stock common flashing profiles and underlayment locally so the turnaround on a Westwood repair doesn’t stretch into weeks. If you want a specific brand, say so. We’ll price it and put it in writing.
Common Roof Installation Problems We See in Westwood Homes
These are the issues that come up again and again when we re-roof in Westwood:
- Original clay tile on spaced sheathing. Homes built in the 1920s and 30s often have tile laid over open gaps in 1x decking. Current code requires solid decking. If we don’t upgrade the decking, new tile cracks and leaks within a season. You’re paying for the structural fix, not just the surface.
- Flat-roof tie-ins that back up water. Mid-century additions with old torch-down meet sloped sections without proper flashing. Winter rains drive water under the eaves and into the ceiling. The fix is custom metal and, usually, re-sloping the low end.
- Santa Ana wind damage to ridge and hip tiles. Hillside homes north of Sunset catch the full force of Santa Ana winds. Where installers reused weakened original fasteners, tiles lift and scatter. We replace every fastener, not just the visible broken tile.
- Moss and debris in shaded canyons. Westwood’s wet winters and dry summers create moss growth on shaded roof sections, especially under large oaks and sycamores near UCLA and the surrounding canyons. Moss holds moisture against the roof and accelerates shingle and underlayment decay. We clear it during re-roof and recommend ventilation upgrades when the attic runs humid.
See the difference
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After
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AfterPricing for Roof Installation in Westwood, CA
A full composition shingle re-roof on a typical Westwood ranch home runs $14,000 to $19,000. Clay tile re-roofs on Spanish and Mediterranean homes run $28,000 to $38,000 once you factor in decking replacement, tile salvage, and the structural work on spaced sheathing. TPO on a flat-roof addition runs $9 to $14 per square foot. The two biggest cost drivers are what we find under the old roof and whether your lot is in the hills, where material haul access tightens. We don’t give ballparks over the phone and then send a different number. We walk the roof, check the decking, and hand you a written line-item quote. The price on that quote is the price. Call (213) 521-8272 to schedule a free estimate.
We Also Serve Cities Near Westwood
Mercer Roofing serves homeowners across the west side and into the Valley. If you’re in Westwood or a neighboring community, we’re already working in your area. We regularly roof homes in North Hollywood, Burbank, West Hollywood, and Venice. The same written price, the same badge-at-the-door standard applies.
Serving Westwood, CA - Our Local Coverage Area
We’re based in the Westwood 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 Roof Installation in Westwood
Spaced sheathing adds $3,000 to $8,000 to a typical Westwood re-roof because code requires solid decking before new roofing goes down. The old 1x boards come off or get overlaid with plywood, and any rot gets replaced. Skipping this step saves money today and costs you a leaking roof within a season. Call (213) 521-8272 for an exact number on your home, the estimate is free.
The tie-in where a flat roof meets a sloped section is almost always flashed incorrectly on mid-century Westwood homes. Old torch-down butts against shingle or tile with a shallow metal strip that winter rains can back up behind. Water pools at the seam, works under the eaves, and shows up as a ceiling stain halfway across the room. We fix it with custom flashing that extends past the seam and a small slope correction toward drainage. Most tie-in repairs run $800 to $1,800. Call (213) 521-8272 and we’ll take a look.
Yes. Roof replacements on Westwood hillside properties with septic and well systems fall under county permitting, and the setback rules can affect staging areas and material delivery. We pull the permits and coordinate inspections for you, and the permit work is included in your written quote. No one from Mercer starts a job without permits in hand. Call (213) 521-8272 and we’ll check your lot’s specifics before we quote.
Homes in the hills north of Sunset have narrow, winding roads that complicate material delivery. We stage materials at the nearest accessible point and shuttle them up with smaller vehicles, which adds a day to the job and a modest delivery line item to the quote. We tell you about it before you sign. No surprises on the invoice. For an exact cost on your street, call (213) 521-8272.
Yes, and we do it often in Westwood. TPO is the right membrane for a detached ADU, workshop, or garage with a flat or low-slope roof. A typical standalone structure runs $4,500 to $7,000 for the membrane, insulation, and edge details. We’ll check the decking underneath and the drainage before we quote, and the price we write is the price you pay. Call (213) 521-8272 to schedule a free estimate.
We Know Westwood’s Hills, Because We Work Them
Westwood’s mix of roofing history is unusual. The neighborhoods near UCLA and the flats around Wilshire hold 1920s Spanish and Mediterranean Revival homes with original clay tile roofs that predate modern building code. The hills north of Sunset add age and terrain to the equation. Original clay tile in those areas sits on spaced sheathing. That’s the way they built then. It worked until the code changed, and now any re-roof means tear-off plus structural decking upgrades that neighboring flatland cities almost never require. We price that work honestly because we’ve done it dozens of times.
One hillside lot north of Sunset sticks with us. Our crew pulled 1920s clay tiles off spaced sheathing and found dry rot in the original 1x decking. We added solid plywood decking, ice and water shield at the valleys, and re-laid the owner’s salvaged Boral tiles over new underlayment, tying the new roof into a mid-century flat-roof addition with custom flashing. The owner got a roof that looks the way it did in 1928 and performs the way code requires in 2026. That’s the Westwood difference: old bones, modern structure.
For homeowners near the Holmby Hills or up in the canyons, the permitting side matters too. County rules govern roof work on many of these lots, and septic and well setbacks can change where materials get staged. We handle the permits and inspections, and we quote the true cost of access. You won’t find that level of detail on a generic roofing page. That’s the point of calling someone who actually works here.
Call Mercer Roofing Co Los Angeles for Your Westwood Roof
If you’re re-roofing in Westwood, start with a walkthrough and a written number. We’ll send a technician whose name and photo you already have, who badges in at the door, and who writes down a price before any work starts. The quote covers the decking, the flashing, the permits, the haul access, and the roof itself. Everything in writing. Everything guaranteed for 365 days. Call (213) 521-8272 to schedule your free estimate.
Written by Grant Whitlock, Owner at Mercer Roofing Co Los Angeles, serving Westwood since 2000.