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
Trusted Roof Installation for Los Angeles Homeowners
Roof installation in Los Angeles runs $11,000 to $28,000 for a full tear-off and replacement on an average single-family home, depending on material, pitch, and the condition of the decking underneath. That’s the honest range, and you’ll get a written line-item price from us before any work begins, not a ballpark you have to trust and a final bill you didn’t expect. Mercer Roofing Co Los Angeles has been handling our Roof Installation in Los Angeles since 2000, and we send the tech’s name and photo to your phone before they arrive, so the person at your door is exactly who you expected. Call (213) 521-8272 for a free estimate, and you’ll talk to a live person, any hour.
Every roof installation in this city contends with two things: the dry-season sun that bakes shingle adhesive into brittleness and the winter rains that find every seam. From Silver Lake to West Hills, the homes are different, but the failure points repeat. We quote by what the roof actually needs, not by square foot only, and we put it in writing.
Shingle Roof
A Shingle Roof is the most common roofing system in Los Angeles, made of overlapping asphalt or composite shingles nailed to decking over an underlayment. You install one when the old roof has lost its granule surface, is leaking at the edges, or simply has aged past its useful life, which in this climate means anywhere from 18 to 25 years. Mercer Roofing Co Los Angeles installs GAF and CertainTeed shingle systems, and a full tear-off and shingle roof installation in Los Angeles typically runs $11,000 to $16,000 on a 1,500-square-foot home.
When Shingles Make Sense
Asphalt shingles hold up best on low to moderate slopes, the kind you see across most of the San Fernando Valley and South Gate. They cost less up front than tile or standing seam and can be replaced in one or two working days for most homes. For budget-conscious homeowners who still want a full 30-year rated product, shingles are the practical choice.
What We Look For Before Quoting
We pull back the old shingles at the eaves and around the pipe boots to check the decking for dry rot before we write your price. In neighborhoods like Mar Vista and Westchester, we often find moisture-damaged plywood near the rakes that other quotes miss and surprise you with later. Our written quote includes that decking work when it’s visible, so the price holds.
Styles & brands we work with
Standing Seam Metal Roof
A Standing Seam Metal Roof is a panel roofing system with vertical legs and concealed fasteners, commonly double-locked at the seams and built to move with thermal expansion. Homeowners choose it when they want to stop replacing their roof every two decades, especially on steep or architectural roofs where metal’s clean lines look intentional. Mercer Roofing Co Los Angeles installs standing seam in our Roof Installation in Lynwood and throughout Los Angeles for $18,000 to $28,000 on an average home, and the difference in cost buys you a 40-to-60-year roof with almost no maintenance.
Why Los Angeles Heat Favors Metal
Metal reflects a good share of the sun’s energy and sheds heat much faster than asphalt at night. That matters in August in the Valley, where an attic under a dark shingle roof can hit 140 degrees. A standing seam roof can lower attic temperatures noticeably, which helps your cooling equipment last and work less.
Fire and Rain Performance
The concealed-fastener design also means no exposed nail holes for water to track through, which is why standing seam remains the go-to in fire-prone and heavy-rain parts of LA County. If you are in a designated high fire severity zone or just want a roof that will not need a patch job after every winter storm, this is the system worth pricing out. Grant Whitlock says most clients who choose metal tell him they wish they had done it a roof ago.
Tile Roof
A Tile Roof is made of clay or concrete tiles laid over battens or foam adhesive, built to outlast most other materials and common across Los Angeles from Pasadena to Porter Ranch. Tile is chosen for its 50-to-100-year lifespan, its resistance to salt air near the coast, and the distinct Spanish or Mediterranean silhouette it gives a home. Mercer Roofing Co Los Angeles installs tile roof systems in Los Angeles for $16,000 to $26,000 on a standard home, though the final number swings on whether you choose clay or concrete and how much new underlayment goes down.
Clay vs Concrete Tile
Clay tile is the traditional choice, lighter per tile and more expensive, with a color that runs through the whole piece and never fades. Concrete tile is heavier, cheaper, and available in more profiles and colors, but it can fade over decades in direct LA sun. Both require a properly flashed underlayment beneath them, which is where most Roof Installation - Bell tile roofs we replace actually failed.
Tile and the LA Earthquake Factor
Tile roofs hold up to weather but need proper attachment for seismic movement, which is why we secure them to code with the right fasteners and spacing per LA building requirements. We do not skip a nail pattern to save time. The work gets inspected, and the underlayment is renewed, so what goes under the tile is protected as well as what sits on top.
Roof Ventilation
Roof Ventilation is the system of intake and exhaust that moves outside air through the attic space to keep temperature and humidity from building up under the roof deck. A roof installation is the right time to get ventilation corrected, because adding it later means cutting into a brand-new roof. Mercer Roofing Co Los Angeles installs balanced ridge-and-soffit ventilation as part of most roof replacements, and if you are replacing a roof in Los Angeles, expect to pay $800 to $1,800 for a proper ventilation package depending on attic size and roof complexity.
What Under-Ventilated Attics Do
An attic that cannot move air traps heat against the shingle backs, which cooks them from underneath and shortens the roof you just paid for. It also raises indoor temperature and can push moisture into the insulation, which leads to that musty smell homeowners sometimes call a roof leak when it is actually a sweat problem. The fix is air movement, not more caulk.
Balanced Airflow Is the Standard
A good ventilation system draws in at the eaves and exits at the ridge, moving air continuously across the whole underside of the deck. We calculate net free vent area per the building code formula, not by guesswork. If your old roof had no soffit vents and only a couple of mushroom caps, the new one should have a real plan, and that is part of our written quote, not an add-on discovery later.
Roof Flashing Installation
Roof Flashing Installation is the work of fitting metal strips at every joint, valley, wall intersection, chimney, skylight, and pipe on the roof so water cannot get in where two surfaces meet. Flashing is not a small piece of the roof; it is the roof’s waterproof joints, and bad flashing leaks even when the shingles are perfect. Mercer Roofing Co Los Angeles replaces and installs flashing as part of every roof replacement, and standalone flashing repair in Los Angeles typically runs $300 to $900 depending on how many penetrations need work.
Where Flashing Fails First
Chimney and skylight flashing take the most movement because those structures expand and contract at a different rate than the roof deck. In older Los Angeles homes, especially in Miracle Mile and Hancock Park, we see step flashing nailed wrong or worn through at the corners. Once water is tracking behind the flashing, it can run for months before a stain shows inside the house, usually a floor below the problem.
We Inspect It Before We Quote
During the roof tear-off, we check the condition of every existing flashing piece and replace any that are pitted, separated, or too short for the new roof line. The quote already accounts for new flashing where it is needed, so the final invoice matches the estimate. That is the whole point of a written price before work starts: you should know what the flashing costs before it is on the truck.
TPO Roofing Installation
TPO Roofing Installation is the process of installing thermoplastic polyolefin membrane, a heat-welded single-ply roof material used on flat and low-slope roofs. It is the standard choice for commercial buildings and increasingly common on the flat-roofed residential additions and modern homes springing up across Los Angeles. Mercer Roofing Co Los Angeles installs TPO systems for $7 to $11 per square foot installed, which means a 1,000-square-foot flat roof in Los Angeles runs $7,000 to $11,000 depending on insulation and edge detail work.
Why TPO Works on Flat Roofs
Flat and low-slope roofs cannot shed water the way a pitched roof can, so the membrane itself has to be the waterproof surface. TPO is white, which reflects the LA sun instead of absorbing it, and the seams are welded together with heat, so there are no glue joints to open up in a hot attic. Boral and the other shingle brands do not make TPO; this is a separate membrane system, and the installers must be trained on hot-weld technique, which ours are.
When TPO Is the Right Call
A flat roof covered in rolled asphalt or built-up tar that is cracking, ponding, or patched in multiple places is usually a candidate for a TPO replacement. The membrane is also lighter than built-up roofing, which matters on older LA structures that were not framed for a lot of dead load. If you have a flat section over a garage or an addition, TPO may cost less than you think and last 20 to 25 years with occasional cleaning.
Brands We Service
We install GAF shingle systems, and we know their product lines well enough to match the right shingle to the right roof deck and slope, not just the right color. GAF’s Timberline line is the most common choice here in Los Angeles, and we install it with the manufacturer’s full assembly so the material warranty actually means something.
CertainTeed and Owens Corning round out the shingle selection we offer, with CertainTeed’s Landmark shingles being a common upgrade for homeowners who want better wind performance and a deeper granule color, and Owens Corning’s Duration series giving you a slightly different aesthetic at a mid-range price. Whether you have GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, Boral, or any other make, we can help with installation and repair on whatever you have. Homeowners in Los Angeles, Burbank, and South Gate can read more on our Roof Installation in Burbank and Roof Installation in South Gate pages for the same written-price promise in their city.
See the difference
Before
After
Before
After
Before
AfterSigns You Need a Pro Right Now
- Water stains on the ceiling or walls. A stain means water has already gotten past the roof and is working its way down. By the time you see it inside, the decking underneath is likely wet, and every rain adds to the damage. This is the one to call about today.
- Granules in the gutters or at the downspout outlets. Asphalt shingles shed granules as they age, and a heavy buildup in the gutter after a storm means the shingles are losing their protective surface. Once granules are gone, UV breaks the asphalt down fast, and the roof starts taking on water.
- Curling, cracking, or missing shingles. Shingles that curl up at the corners or crack in rows are no longer sealing, which means wind can lift them and rain can get underneath. A roof with a few missing shingles after a Santa Ana wind event is one storm away from an interior leak.
- Daylight visible from inside the attic. If you can see light coming through the roof boards while standing in the attic, water can get in through those same gaps. This is a sign the roof has failed in multiple places, and patching will not fix it for long. You need a full inspection, not a tube of caulk.
- Sagging or dipping roof lines. A roof deck that has absorbed water for years will start to deflect between the rafters. That is structural, not cosmetic, and it means the decking is losing its strength. If you can see a dip in the roofline from the street, call us before the next heavy rain.
Our Process, Step by Step
- 1
Call and talk to a live person. When you call (213) 521-8272, a real human answers, any time of day or night, and takes your information. You will never get a voicemail tree or a call-back form. You will get a scheduled visit time.
- 2
Meet your technician at the door. Before our technician arrives, you will receive a text with their name and photo, and when they get to your house, they will be in a clean marked uniform and present a photo ID badge. You do not open the door to a stranger. You open the door to the exact person you expected.
- 3
Get a written price, no pressure. We inspect the roof, the attic, the flashing, and the ventilation, then we write up a line-item quote on the spot. The price you see is the price you pay. We do not start work until you have signed that written estimate.
- 4
Installation with the right materials and methods. The installation happens with manufacturer-recognized materials and to LA building code, with permits pulled and inspections passed. We send you updates as things progress, and any questions you have get answered by the same person who quoted the job.
- 5
Final walkthrough and the Written Guarantee. After the roof is installed and inspected, we walk the property with you and show you exactly what was done. Every job includes the 365-Day Done Right Promise in writing: if it is not right within a year, we make it right.
How Much Does Roof Installation Cost in Los Angeles?
A full shingle roof installation on a 1,500-square-foot Los Angeles home runs $11,000 to $16,000, while standing seam metal on the same house runs $18,000 to $28,000. Tile roof installation runs $16,000 to $26,000, and a flat-roof TPO system runs $7 to $11 per square foot installed, or $7,000 to $11,000 on a 1,000-square-foot flat roof. Roof ventilation on a replacement runs $800 to $1,800 as part of the same job. Standalone flashing repair runs $300 to $900.
What moves the price most is the condition of the decking, the roof pitch, the number of penetrations, and whether the old roof has one layer or two. Steep roofs cost more because crews move slower and need additional safety equipment. Two layers of old shingles cost more because both come off before the new roof goes on. Decking replacement can add $2 to $4 per square foot on the sections that are deteriorated.
The best way to avoid overpaying is to get a written quote that breaks out decking, flashing, ventilation, and materials separately. If a quote is just one number per square, you cannot tell what you are actually buying. Our free estimate includes a full written breakdown, and the price does not change when the work begins. That is the point of a written price before any work starts: no surprises on the invoice. Call (213) 521-8272 to schedule your free estimate.
Our Service Area Near Los Angeles
Mercer Roofing Co Los Angeles installs roofs throughout Los Angeles and the surrounding cities, including Lynwood, Gardena, Bell Gardens, Bell, West Hollywood, Lennox, Walnut Park, Commerce, and Del Aire. From the Valley to the South Bay, our technicians arrive in a clean marked uniform with photo ID, and we give you a written price before any work begins, no matter which neighborhood you call from. If you are in the area, you can also see our Roof Installation in Los Angeles home page for more on what we cover across the city. This is also a good time to mention that our home page has the full story on the Threshold Standard and our written guarantee.
Serving Los Angeles, CA - Our Local Coverage Area
We’re based in the Los Angeles area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions About Roof Installation in Los Angeles
Roof installation is the full process of removing the old roof and installing a new one, including the underlayment, flashing, ventilation, and the outer roofing material. In Los Angeles, roof installation means taking a house from a failed or aging roof to a new watertight system that meets current building code and passes inspection. It is different from a roof repair, which addresses a specific leak or damaged section instead of the whole roof.
A shingle roof installation on an average Los Angeles home takes one to three working days, depending on the roof size, pitch, and the amount of decking that needs replacement. Tile and standing seam installations take longer, typically four to seven working days, because the material handling is slower and more methodical. Your quote includes a timeline, and we tell you up front if weather or inspection schedules change it.
A full shingle roof installation in Los Angeles runs $11,000 to $16,000 on a 1,500-square-foot home, and standing seam runs $18,000 to $28,000 for the same size. Tile roofs run $16,000 to $26,000, TPO flat roofs run $7 to $11 per square foot, and roof ventilation runs $800 to $1,800 when installed as part of the job. Call (213) 521-8272 for an exact quote, and you will get a written line-item price, free.
Yes, we install and service GAF, CertainTeed, and Owens Corning shingle systems, along with Atlas, IKO, Tamko, and Boral products. We install these brands per the manufacturer’s full assembly specifications so the material warranties remain valid. If you have an existing roof from one of these brands, we can match repairs and replacement materials correctly.
We answer the phone with a live person 24/7, and we can get a technician out to assess a failed roof quickly, especially after a storm or wind event. A full roof installation is still a scheduled job because it requires a permit and an inspection, but the assessment and any protective tarping happen right away. Call us any hour, and you will talk to a human who can get things moving.
Every roof installation from Mercer Roofing Co Los Angeles includes the 365-Day Done Right Promise in writing: if the work is not right within a year, we make it right. Shingle and membrane materials also carry manufacturer warranties that apply when the roof is installed to the manufacturer’s specifications, which we do. Your written quote states exactly what the warranty covers and for how long.
Move vehicles out of the driveway and away from the eaves so our crew has clear access and your cars stay clear of falling debris. Take pictures or fragile items off the walls inside, because nail guns create vibration that can rattle frames loose. We will go over the full preparation checklist with you at the quote, so nothing catches you by surprise on install day.
Schedule Your Roof Installation Service in Los Angeles Today
You will get a written price for your Los Angeles roof installation before any work begins, and the technician who shows up will be the person whose name and photo we already sent you. No surprises, no badge-less strangers, no fuzzy pricing. Call (213) 521-8272 to schedule your free estimate, and a live person will answer, day or night.
Written by Grant Whitlock, Owner at Mercer Roofing Co Los Angeles, serving Los Angeles since 2000.