Metal roofing
Architectural shingles
Tile roofing
GAF
Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Fast, Reliable Roof Installation Across Oak Park
A new roof installation in Oak Park typically runs $14,000 to $38,000 depending on pitch, material, and square footage, and takes 3 to 7 working days once materials are staged. Oak Park’s steep, multi-plane roofs on hillside homes drive most of that range: a 2,500-square-foot architectural shingle roof usually lands between $16,000 and $24,000, while concrete tile runs $22,000 to $38,000. We’re a Roofing Company - Oak Park that has installed and repaired roofs across the area for years. Call (805) 309-3314 for a written, line-item estimate before any work begins.
Our Roof Installation crews know Oak Park’s hills, its wind patterns, and its tile-heavy 1970s – 1990s subdivisions. We coordinate dispatch from our Los Angeles office, but the crew that shows up at your door is local to the area, uniformed, background-checked, and badged with photo ID. You’ll get their name and photo before they arrive.
Why Mercer Roofing Co Thousand Oaks Is Oak Park’s Preferred Roof Installation Company
We’ve earned a strong local reputation in Oak Park by treating steep hillside roofs as what they are: a real safety system, not just a surface to nail shingles onto. Homeowners here don’t ask for cosmetic re-roofs. They ask for roofs that will survive a 60 mph Santa Ana gust and keep embers out during fire season. That’s the standard we build to, and it’s why Oak Park customers call us back for repairs, maintenance, and neighbor referrals.
Every Oak Park project starts the same way. We inspect the existing roof, decking, and flashing, then put a written price in your hand before any work starts. No allowances that balloon later without your sign-off. No surprises on the invoice. If a repair fails within 365 days, we return and make it right under our 365-Day Done Right Promise, backed by a written guarantee on every job.
Grant Whitlock leads our team, and he holds every technician to the Threshold Verified standard: background-checked, identity-verified, uniformed, and photo-badged at your door. We answer the phone with a live person 24/7, not a callback queue. For Oak Park homeowners who want to know exactly who is walking up their driveway, that matters.
We serve all of Oak Park: the hillside custom homes off Doubletree Road, the 1980s subdivisions near Kanan Road, and the larger lots up Lindero Canyon. Our crews know which neighborhoods still carry original flat concrete tile and which have already been re-roofed with architectural shingles.
Styles & brands we work with
Roof Flashing Installation in Oak Park
Roof Flashing Installation in Oak Park is the difference between a roof that sheds water for 25 years and one that leaks at the first heavy rain. Flashing is the metal material, typically galvanized steel or aluminum, that seals the joints where your roof meets a chimney, skylight, wall, or valley. On Oak Park’s multi-plane roofs, flashing is not optional trim. It’s the first line of defense at every transition point, and old or separated flashing is one of the most common sources of leaks we find on 1970s – 1990s homes in the area.
Flashings corrode, pull away, or get bent during windstorms. On steep pitches, water moves fast and finds any gap. We replace flashing as part of a full roof installation or as a targeted repair, and the cost for flashing work in Oak Park typically runs $450 to $1,800 depending on how many penetrations and valleys are involved. A full chimney re-flash with new step and counter flashing usually falls between $800 and $1,600.
Valley and penetration flashing
Valleys on Oak Park roofs carry a lot of water during the rare but intense winter rains. We install new valley metal or woven valley membrane, then seal around every pipe boot, vent, and skylight curb. On tile roofs, we replace cracked tiles at the valley edges before resetting flashing so the water channel stays clean.
Chimney and wall step flashing
Step flashing where a roof plane meets a vertical wall or chimney is a weak point on many original Oak Park homes. We cut in new step flashing course by course, then counter-flash with a reglet cut for a mechanical seal. No caulk-only shortcuts.
TPO Roofing Installation in Oak Park
TPO Roofing Installation in Oak Park is the standard choice for flat or low-slope sections: pool houses, detached garages, patio covers, and some modern additions. TPO, or thermoplastic polyolefin, is a white single-ply membrane that reflects heat, resists UV breakdown, and welds at the seams for a watertight surface. Oak Park homeowners with 1980s pool houses or flat garage roofs often find the original torch-down or built-up roofing has cracked under heat and sun exposure.
TPO installation on an Oak Park pool house or flat garage roof typically runs $4,500 to $8,500 including tear-off of the old membrane, new insulation board where needed, and heat-welded seams. Larger flat roof sections on a main home run $9,000 to $16,000. The white membrane also keeps those detached structures cooler in summer, which matters when the temperature in the hills climbs into the high 90s.
Heat-welded seams, not glued
We heat-weld every TPO seam with a robotic welder for a consistent bond. Glued or taped seams fail early. On Oak Park’s flat roofs, pooled water after rain is the test, and welded seams hold where adhesives peel.
Replacing old built-up and torch-down roofs
Most flat structures we work on in Oak Park still have aged built-up asphalt or torch-down membranes. We tear off to the deck, check for dry rot, install new cover board or insulation, then lay the TPO with proper perimeter fastening rated for 60 mph winds.
Trusted Brands We Service in Oak Park
We install and repair roofs using GAF, Atlas, and Tamko materials, plus CertainTeed, Owens Corning, IKO, and Boral when the job calls for it. GAF Timberline HDZ architectural shingles are a common choice for Oak Park homes re-roofing over old dimensional shingles, while Atlas StormMaster Shake and Pinnacle lines give us strong wind-rated options for hillside exposure. Tamko’s Titan XT offers a thick, impact-rated shingle that holds up on steep pitches. For concrete tile replacement, we keep matching stock for the original 1980s flat tiles found throughout Oak Park subdivisions, so a partial repair blends with the existing roof instead of standing out as a patch.
Common Roof Installation Problems We See in Oak Park Homes
- Cracked flat concrete tile on 1980s homes. Original concrete tiles off Kanan Road and Doubletree Road crack under foot traffic and lift in Santa Ana winds, exposing decking to ember intrusion. We keep matching tile stock on hand for these subdivisions specifically.
- Starter strips and nailing patterns that fail wind ratings. Architectural shingles installed with too few nails or poorly set starter strips peel back in 60+ mph gusts. We re-nail to manufacturer wind specs and check the starter course on every Oak Park install.
- Corroded or separated flashing at valleys and penetrations. Older homes throughout Oak Park have original galvanized flashing that has given out, especially at chimney cricket and skylight transitions. Leaks show up during the first heavy rain after a dry spell.
- Decking rot at roof edges and under old tile. Steep pitches shed water, but the overhangs and eaves collect it. We find soft decking at the edges of 1970s and 1980s homes where old underlayment has worn thin, and we replace it before laying new material.
See the difference
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AfterPricing for Roof Installation in Oak Park, CA
Here’s what Oak Park homeowners should expect. Architectural shingle installation on a standard 2,000 to 3,000-square-foot home runs $14,000 to $24,000. Concrete tile re-roofing of the same size runs $22,000 to $38,000, with the higher end covering steep pitches, tear-off of heavy tile, and new underlayment. TPO on flat sections runs $4,500 to $16,000 depending on size. Flashing replacement as part of an install adds $450 to $1,800.
The biggest cost drivers in Oak Park are pitch, material, and the condition of the decking underneath. Steeper roofs require more safety setup and take longer per square. Tile is heavy and labor-intensive. If the deck needs repair, that’s priced in writing before we touch it.
Call (805) 309-3314 for your free written estimate. We’ll inspect, measure, and give you line-item numbers before any work is scheduled.
We Also Serve Cities Near Oak Park
Mercer Roofing Co Thousand Oaks serves Oak Park plus the surrounding communities of Westlake Village, Thousand Oaks, Agoura Hills, and Simi Valley. If you are just over the line in one of those cities, we’ll bring the same written pricing, Threshold Verified technicians, and 365-Day Done Right Promise to your roof. One call covers the whole area.
Serving Oak Park, CA - Our Local Coverage Area
We’re based in the Oak Park 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 Oak Park
Yes. Oak Park sits in a designated wildfire hazard zone, and Los Angeles County building code requires Class A fire-rated roofing materials for new installations and re-roofs throughout the area. Most asphalt shingle lines from GAF, Atlas, and Tamko meet Class A when installed over the correct underlayment, and concrete tile is inherently Class A when the assembly is complete. We pull permits on every full installation and pass the fire inspection. Call (805) 309-3314 and we’ll walk you through the material options that meet code for your specific lot.
Steep pitches, anything over 7/12, add cost because they slow the crew, require roof jacks and safety harnesses, and increase material waste. On many Oak Park hillside homes we see 9/12 to 12/12 pitches, which push an installation 15 to 25 percent higher than the same square footage on a flatter suburban roof. It’s also more physically demanding work. We send only trained, equipped crews to Oak Park steep-pitch jobs, and we price the pitch honestly in your written estimate. Call (805) 309-3314 for a free inspection and number.
Yes, in most cases. We keep matching stock for the original flat concrete tiles used throughout the 1980s subdivisions off Kanan Road and around Medea Valley. When we can’t source an exact discontinued tile, we’ll find a close visual match and blend the replacement tiles with the existing roof so the patch doesn’t read as an obvious repair. On a 1980s subdivision home off Kanan Road, our crew replaced cracked flat concrete tiles that had failed under foot traffic after a windstorm, matched them from our local stock, installed new high-temp underlayment, and reset the drip edge and valley flashing to code, passing inspection in one day. Call (805) 309-3314 if you’ve got cracked or missing tile.
Yes, but not because of snow. We install ice and water shield at the eaves, valleys, and around penetrations on every Oak Park roof. The valley and penetration strips matter here even in a dry climate because the rare intense rains hit those areas first, and wind-driven water gets pushed uphill at the eaves. The membrane is cheap insurance against a leak show up six months after install. It’s included in our written price, not an add-on.
One roofing square equals 100 square feet. So a 2,500-square-foot roof is 25 squares. When a roofer quotes you $550 per square, multiply by the square count, not your home’s interior square footage. We quote in total dollars with line items, so you never have to do that math. Ask every bidder for the square count, the material, the underlayment, and the flashing scope in writing. Then call (805) 309-3314 and we’ll give you a written line-item number to compare fairly.
Call Mercer Roofing Co Thousand Oaks for Your Oak Park Roof Installation
Whether you’re re-roofing a steep hillside home, replacing a cracked tile roof off Kanan Road, or putting TPO on a pool house, we’ll give you a written price before any work starts, send a badged technician whose name and photo you’ll have before they arrive, and back the job with our 365-Day Done Right Promise. Call (805) 309-3314 to schedule your free Oak Park estimate.
Written by Grant Whitlock, Owner at Mercer Roofing Co Thousand Oaks, serving Oak Park and the surrounding communities.