Roof Installation Services in Los Angeles
New roofs for homes, additions, ADUs, and garages, installed by a licensed C-39 roofing contractor working across Los Angeles County. Estimates are free.
- Licensed, bonded & insured
- CSLB #1119699 (C-39)
- BBB Accredited, A rating
New Construction Roofing for Homes and ADUs
Roof installation on this page means a roof on new work: a new home, a room addition, a detached ADU, a garage, or a patio cover. Overhead Roofing installs shingle, tile, metal, and low-slope roofs on new construction across Los Angeles County, working from your plans and on your builder’s schedule.
For an existing roof that is wearing out, see roof replacement, or reroofing to weigh an overlay against a tear-off. For new work, the pages below cover each roofing material and the parts that finish a roof.
Our team brings 25+ years of roofing experience, and Overhead Roofing works under C-39 Roofing license #1119699 from the CSLB. Every estimate is free and in writing.
CSLB #1119699 (C-39)
25+ years of roofing
2:12 (CRC R905.2.2)
1/4:12 for low-slope roofs
Shingle Roof Installation
The full job on a new shingle roof: underlayment, flashing, shingles, ridge, permit, and inspection.
Asphalt Shingle Options
Choosing shingles for an LA home: architectural styles, cool roof colors, Class A, and wind ratings.
Tile Roof Installation
New clay or concrete tile roofs, including the structural check when a house switches to tile.
Metal Roof Installation
Standing seam and other metal roofs on new homes and additions, or in place of shingles or tile.
Flat Roof Installation
Low-slope roofs on additions, ADUs, garages, patio covers, and new buildings.
Skylight Installation
New skylights and sun tunnels, framed, flashed, and sealed into the roof.
Ridge Cap Installation
Hip and ridge caps and ridge vents that finish the top of a shingle, tile, or metal roof.
Drip Edge Installation
Metal edging at the eaves and rakes that carries water off the roof and protects the fascia.
Roof Installation for New Homes, Additions, and ADUs
Each type of project puts the roof at a different point in the build. These are the jobs we see most:
New single-family homes
On a new house, the framing crew builds the roof deck, and we take it from there: underlayment, flashing, drip edge, roofing, and ridge. We work from the roof plan and the material in the plans, and we set dates with your general contractor so the house is dried in before drywall goes up. Vents, ducts, and solar mounts are planned with us instead of cut in later.
Room additions
On an addition, most roofing decisions are about the joint between old and new. The new roof has to meet the existing one at a valley, a wall, or a ridge without trapping water, and from the street the two should read as one house. We check the existing roof’s pitch and material before the addition is framed, since both shape the tie-in.
Detached ADUs
A detached ADU is a small house of its own, so it gets a complete roof system: deck, underlayment, flashing, edge metal, roofing, and vents for the attic or rafter space. Many backyard ADUs are designed with a low-slope roof, which narrows the choice to membrane roofing or standing seam metal. The Energy Code treats a newly built detached ADU as a new home, so the plans may need roof space for solar.
Garage conversions and attached ADUs
When a garage becomes an ADU, the garage roof usually stays, and the real question is whether it is sound enough to keep. If it is near the end of its life, reroof it during the conversion, before new ceilings and insulation go in underneath. An attached ADU built as an addition follows the same tie-in rules as any other addition.
Patio covers, carports, and porch roofs
Solid patio covers and porch roofs attached to the house are usually low-slope. The joint to watch is the ledger, where the new roof meets the house wall: it needs metal flashing tucked behind the stucco or siding, not a bead of caulk on its face. We also check where the cover drains, so its water does not spill against the house or onto a walkway.
Roof Pitch and the Roofing Materials It Allows
The slope of a new roof is set in the plans, and it decides which roofing the California Residential Code allows. Pitch is written as rise over run: a 4:12 roof rises 4 inches for every 12 inches across.
| Roof slope | Roofing that fits | Code notes |
|---|---|---|
| Under 2:12 (low slope) | Modified bitumen (torch-down), TPO and other single-ply membranes, built-up roofing, standing seam metal | Each needs a slope of at least 1/4:12 so water drains |
| 2:12 to under 2-1/2:12 | Asphalt shingles, plus the low-slope systems and metal panels | Shingles need two layers of underlayment below 4:12 |
| 2-1/2:12 to under 4:12 | Clay and concrete tile join the list; metal shingles start at 3:12 | Tile also needs two layers of underlayment below 4:12 |
| 4:12 and steeper | Asphalt shingles, clay or concrete tile, metal panels, and metal shingles | One layer of underlayment is allowed |
Source: 2025 California Residential Code, Section R905. A product’s installation instructions can set a higher minimum slope.
Below 2:12, shingles and tile are off the table, so flat-roofed additions, garages, and ADUs get torch-down, TPO, or metal. Our flat roof installation page compares those systems for new work. From 4:12 up, the choice comes down to weight, fire rating, looks, HOA rules, and budget. Tile is heavy, so a tile roof has to be part of the structural design from the start.
Tying a New Roof Into the Existing House
On an addition, the joints between new and existing work need the most planning. We settle these details before the framing is finished:
- Roof-to-roof valleys. Where the addition’s roof runs into the main roof, the valley has to be sized for the water it carries, with valley metal or underlayment lapped under the existing roofing.
- Roof-to-wall joints. Where a new roof meets a taller wall, step flashing goes in with each course of shingles or tile and counterflashing covers it. On stucco, the flashing belongs behind the stucco or in a reglet, not caulked to the surface.
- Crickets. Where a wall, chimney, or the back of a dormer would stop water on its way down the roof, a small peaked cricket sends it to the sides.
- Low-slope to steep-slope transitions. Where a flat roof meets a pitched one, the membrane runs up under the pitched roofing, with metal flashing over the joint.
- Matching materials. A discontinued or faded shingle or tile may have no exact match. We bring samples, and sometimes a deliberate contrast looks better than a near miss.
If the existing roof is old, consider reroofing it while the crew is already there, so the house ends up with one roof of one age.
Coordinating With Your Builder, Inspector, and Solar Installer
A new roof goes on in the middle of a build, so its timing depends on the trades around it. On a typical project, the order runs like this:
- Framing and roof deck. The framer builds and sheathes the roof. Work has to be inspected before it is covered up, so we schedule around the framing and deck inspections your builder books.
- Dry-in. Underlayment and flashing go on soon after the deck is approved. Los Angeles gets the bulk of its rain from November through March, so that is when a quick dry-in matters most.
- Penetrations. Plumbing vents, fan ducts, and HVAC lines come through the roof before the roofing is finished, and each gets a pipe boot or flashing. Exhaust ducts from bathroom and kitchen fans have to end outside the building, not in the attic.
- Roofing and ridge. The shingles, tile, metal, or membrane go on, then the ridge cap and any ridge vents.
- Solar and final inspection. Solar mounts are flashed in, and the final inspection follows once all work is done.
California’s Energy Code requires solar panels on newly built single-family homes. A newly built detached ADU counts as one, so the requirement can apply to it as well, unless the required system would be smaller than 1.8 kW. If your plans show solar, tell us early so roof vents and plumbing stacks stay out of the panel area. Our guide to solar-ready roofing covers the rest.
Call (877) 557-7778 any time, or use the form below. Office hours are Sunday through Friday, 8 a.m. to 5 p.m.
Energy Code and Fire Rules for a New Roof
New roofs follow the Energy Code’s rules for new construction, which the designer records in the project’s Title 24 energy documents. For new single-family homes, the prescriptive rules call for a cool roof product on steep-slope roofs in climate zones 10 through 15 and on low-slope roofs in zones 13 and 15. An addition larger than 300 square feet must meet the same roofing rules on its new roof. The City of Los Angeles adds a cool roof rule of its own for homes, with exceptions for small additions. We install the product your plans call for and keep its Cool Roof Rating Council (CRRC) label for the inspector.
Fire rules depend on where the lot is. California’s Wildland-Urban Interface Code covers every Very High fire hazard severity zone, among others. There, a new roof must be a Class A roof assembly, and attic and ridge vents must be built to keep out embers. The City of Los Angeles also requires Class A roofing in Very High Fire Hazard Severity Zones and prohibits wood shake and wood shingle roofs everywhere in the city. You can look up a property on the State Fire Marshal’s fire hazard severity zone maps.
What We Need to Quote a New Roof
A new roof is priced from the plans, so the more you can send, the closer the first number will be:
- The roof plan and elevations, with pitch and roof area
- The roofing material and color named in the plans or the HOA approval
- The Title 24 energy report, if it names a cool roof product
- The fire hazard zone, if the lot is in one
- Skylights, solar, and rooftop equipment shown on the plans
- Your builder’s schedule for framing and dry-in
Price depends on roof area, pitch and height, the material, how many valleys, walls, and penetrations need flashing, any tie-in to an existing roof, and access to the site. For figures from published sources, see our guide to roofing costs in Southern California. Your written estimate is free.
Our Reviews
Get an Estimate for Your New Roof
Send us the roof plan, the roofing material in your plans, and your build schedule, and tell us if it is a new home, addition, or ADU. Call (877) 557-7778 or use the form below. Licensed, bonded, and insured under CSLB #1119699 (C-39), we give free written estimates.
Get Your Free Estimate
Please fill out the form below, or call: (877) 557-7778
Please fill out the form below, or call:
(877) 557-7778
Need Roof Repair or Replacement? Get a Free Estimate Today!
Don’t wait until a minor issue turns into a significant expense. At Overhead Roofing CA, we make it easy to get expert service fast with no pressure and no hidden fees. From routine roof maintenance to full tear-offs and installations, our team handles every project with precision, honesty, and care.
We specialize in helping LA homeowners and business owners protect their most valuable assets with dependable roofing solutions that last. Our licensed contractors are standing by, ready to inspect your roof, answer your questions, and provide a clear action plan all at no cost to you.
Residential roof repair & replacement
Commercial roofing inspections & upgrades
Emergency leak response & storm damage repair
Financing options available for every budget
Roof Installation Questions From Builders and Homeowners
What do roof installation services include on a new build?
Everything from the roof deck up: underlayment, drip edge, flashing at walls, valleys, and penetrations, the roof covering, ridge cap, and roof vents. The framing and sheathing are usually the framer’s work, though we check the deck before we cover it. Skylights, crickets, and gutters can be part of the roofing scope or handled by others, so the estimate lists exactly what is included.
Do you work for general contractors and owner-builders?
Yes. Your general contractor can hire us as the roofing subcontractor, or you can hire us directly if you are managing your own build. Either way, we need the plans, the schedule, and a contact for the framer, plumber, and solar installer. You can confirm our license, CSLB #1119699 with the C-39 Roofing classification, on the Contractors State License Board website.
Does the roof on an addition have to match the existing roof?
Your HOA or a historic district may require a match, and most owners want the house to look like one building either way. Matching is easiest when the existing material is still made. When it isn’t, or the old roof has faded, we show samples side by side. If the existing roof is near the end of its life, reroofing it at the same time gives the whole house one roof.
Does a new ADU need a cool roof or solar panels?
It depends on the type of ADU and its location. A newly built detached ADU is treated as a new single-family home under the Energy Code, so the solar requirement can apply unless the required system would be under 1.8 kW. An attached ADU built as an addition of more than 300 square feet has to meet the roofing rules on its new roof. Your designer’s Title 24 report will show what applies.
What is the difference between roof installation and roof replacement?
Roof installation, as we use the term, is a roof on new work: a new home, addition, ADU, garage, or patio cover. Roof replacement removes a worn roof from an existing building and builds a new one on the same deck. If your roof is aging or leaking, start with our roof replacement page.
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