Roof Installation in San Antonio - Written Price, Workmanship Warranty

Trusted Roof Installation for San Antonio Homeowners

A new Roof Installation in San Antonio is a significant decision, one that should never start with a stranger knocking on the door unannounced. Roof installation in San Antonio costs between $8,500 and $18,500 for a typical shingle roof on a 1,500 to 2,200 square foot home, with standing seam metal ranging from $18,000 to $32,000. Mercer Roofing Co San Antonio, founded in 2000 and part of the Threshold Group family, handles full roof replacement and new installation across Bexar County with written pricing before any work begins. Call (254) 276-4369 to get your free estimate.

Call (254) 276-4369

What separates us from the crew that cold-calls after a hailstorm is simple: before any Mercer technician arrives at your door, you receive their name and photo. They badge in with photo ID. The price is in writing before a single nail is driven. That is the Threshold Verified standard, and every independently owned location is contractually held to it.

Shingle Roof

Shingle Roof installation is the most common residential roofing choice in San Antonio, and for good reason: architectural asphalt shingles from GAF, CertainTeed, and Owens Corning typically run $8,500 to $18,500 for a full tear-off and replacement on an average single-story home. Mercer Roofing Co San Antonio installs shingle roofs with ice and water shield in valleys, synthetic underlayment across the deck, and drip edge at every eave and rake. We also handle partial replacements and storm-related repairs when the damage is localized. A shingle roof works well on most San Antonio homes because it handles the heat, the occasional freeze-thaw cycle, and the hail seasons that roll through Bexar County every spring. What you get from us is a written price before we start and a 365-Day Done Right Promise on the installation.

Architectural Shingle Systems

Most of the shingle roofs we install in San Antonio are architectural or dimensional shingles rather than three-tab. They carry 30- to 50-year manufacturer warranties from CertainTeed and GAF, resist wind better than older styles, and look substantially better from the curb. The incremental cost over three-tab is modest, usually $1,200 to $2,500 on an average home, and the lifespan difference makes it the default we recommend.

Full Tear-Off vs. Overlay

Code in San Antonio allows a second layer of shingles in some cases, but we rarely recommend it. A full tear-off lets us inspect the decking beneath for rot and water damage, which is especially important after the freeze events San Antonio has seen in recent years. You get an honest look at what is under your old roof before anything gets covered back up.

Standing Seam Metal Roof

Standing Seam Metal Roof installation is a premium option that costs between $18,000 and $32,000 in San Antonio depending on panel width, gauge, and roof complexity. The value is in the lifespan: a properly installed standing seam roof can last 40 to 60 years with minimal maintenance, and it reflects heat well during San Antonio’s long summers. Mercer Roofing Co San Antonio fabricates panels to order and installs them with concealed fasteners, which means no exposed screw heads to back out over time. The 365-Day Done Right Promise applies to every standing seam roof we install.

Heat and Energy Performance

San Antonio routinely sees 100-degree days from June through September, and a standing seam roof with a reflective finish reduces attic temperatures measurably. That translates to lower cooling loads and, for many homeowners, a noticeable difference on CPS Energy bills. We can add a vented air space beneath the panels to improve the thermal break even further.

Hail and Weather Resistance

Metal roofs are not hail-proof, but they handle San Antonio hail seasons better than most materials. A standing seam panel may dent in a severe storm, but it will not crack or tear like a shingle can. For homeowners in areas like Alamo Heights or Terrell Hills who want the longest-lived roof possible, standing seam is the conversation to have.

Tile Roof

Tile Roof installation is most common on Spanish and Mediterranean-style homes across San Antonio, and the work involves far more than setting tile. A tile roof on a San Antonio home typically runs $22,000 to $45,000 because the framing usually needs reinforcement for the added weight. Mercer Roofing Co San Antonio installs concrete and clay tile systems with upgraded underlayment, proper battens, and flashing details that match the original architecture. Tile roofing lasts 50 years or more when installed correctly, and it will never rot, rust, or attract termites.

Underlayment Is Everything

The tile itself is not waterproof; the underlayment beneath it is. In San Antonio, where temperature swings can crack tile and let water through, we use a double layer of high-tensile synthetic underlayment in critical areas. This is the layer that keeps your ceiling dry, and it is the layer cheap installs skip.

Repair vs. Full Replacement

Many tile roofs in older neighborhoods like Monte Vista and King William need underlayment replacement long before the tile itself wears out. We can lift, store, and reset existing tile over new underlayment, which costs less than a full replacement and preserves the home’s original character. The 365-Day Done Right Promise covers the work either way.

Roof Ventilation

Roof Ventilation is the difference between an attic that cooks at 150 degrees in August and one that stays within 10 degrees of the outside air. In San Antonio, proper ventilation extends shingle life, keeps HVAC systems from working harder than they should, and prevents moisture buildup that leads to mold on the underside of the deck. Mercer Roofing Co San Antonio includes a ventilation assessment with every roof installation, and we quote ventilation work separately when a home needs it: ridge vents, box vents, and solar attic fans typically run $600 to $2,800 depending on home size and configuration. Ventilation is not an add-on; it is part of what makes a roof installation correct.

Ridge Vent and Intake Balance

A ridge vent only works if air can get in somewhere. Many San Antonio homes have ridge vents installed but lack sufficient intake in the soffits, which defeats the whole system. We calculate net free area for both intake and exhaust so the attic actually moves air instead of just having a vent that looks right.

Solar-Powered Attic Fans

For homes where passive ventilation is not enough, a solar attic fan can move 800 to 1,200 cubic feet per minute of hot air out of the attic. It runs off the sun, which San Antonio has in abundance, and it costs nothing to operate. These are a common addition on older homes in Terrell Hills and Castle Hills where attic space is tight.

Roof Flashing Installation

Roof Flashing Installation is the part of a roofing job that determines whether water stays out, and most roof leaks in San Antonio start at a flashing point: chimneys, skylights, vent pipes, valleys, and sidewalls. Flashing work is typically $600 to $3,500 depending on how many areas need attention and whether it is being done as part of a full roof installation or as a standalone repair. Mercer Roofing Co San Antonio uses galvanized steel, aluminum, or copper flashing depending on the application on your roof. Every flashing detail is inspected, measured, and sealed as part of the job, and the work is covered by the 365-Day Done Right Promise.

Chimney and Skylight Details

Chimney flashing is the most failure-prone point on a San Antonio roof because the chimney moves independently from the house as the clay soil expands and contracts. We use step flashing and counter-flashing with a proper reglet cut into the masonry, not just a bead of caulk over the gap. That is the difference between a repair that lasts a season and one that lasts 20 years.

Valley and Pipe Boot Replacement

Valleys carry more water than any other part of the roof during a San Antonio downpour, and a corroded pipe boot can let water in for months before you notice the stain on the ceiling. We replace pipe boots with silicone or lead units rated for the heat we get here, and we use open or closed valley systems based on the roof’s pitch and the material being installed.

TPO Roofing Installation

TPO Roofing Installation is the standard for flat and low-slope commercial and residential roofs in San Antonio, and it costs between $6 and $9 per square foot installed for a typical residential application. TPO, or thermoplastic polyolefin, is a white membrane that reflects heat and is heat-welded at the seams for watertight performance. Mercer Roofing Co San Antonio installs TPO in both 60-mil and 80-mil thicknesses, with the thicker membrane recommended for roofs that see foot traffic or regular maintenance access. Most TPO installations in San Antonio are done on flat-roofed additions, garages, and auxiliary structures rather than primary living space.

Tear-Off vs. Re-cover

Local code in San Antonio generally allows one recover over an existing membrane, but we prefer a tear-off whenever the old roof is saturated or the insulation underneath is compromised. A wet insulation board will haunt a new TPO roof no matter how well the membrane is welded. We check the insulation with a moisture meter before we recommend either path.

Seam Integrity and Warranty

TPO seams are heat-welded, and the quality of that weld determines whether the roof lasts 15 years or fails in 5. Our installers run a probe test on every seam, which catches weak welds before they become leaks. The installation carries the 365-Day Done Right Promise, and the membrane itself carries the manufacturer’s warranty when we install it.

Brands We Service

We install and service all major shingle and membrane brands in the San Antonio market. Our crews work with GAF architectural shingles on a weekly basis, and we are certified to install GAF’s complete lifetime roofing systems, which lets us offer the full extended manufacturer warranty to eligible homeowners.

We also install a high volume of CertainTeed and Owens Corning products, each of which brings specific strengths: CertainTeed’s Landmark line for its color consistency and impact ratings, Owens Corning for its SureNail technology and wind performance ratings. Whether you have GAF, CertainTeed, Owens Corning, or any other make, we can install it and back it with our written guarantee.

Signs You Need a Pro Right Now

• Daylight coming through the attic deck. If you can see light from inside your attic, water has a direct path in. This means the roof decking has gaps or failed material, and San Antonio’s next storm will find it. Call (254) 276-4369 before the next rainfall.
• Granules collecting in the gutters or at downspout exits. Shingle granules are the first thing a roof loses as it ages, and a heavy accumulation in the gutter means the shingles are losing their protective layer. Once the asphalt underneath is exposed to the San Antonio sun, deterioration accelerates fast.
• Water stains on ceilings or walls after a storm. A stain often means the leak has been working quietly for weeks, and the water is now finding a path to the interior. The source is usually at a flashing point or a damaged shingle, and both are repairable if caught early.
• Curled, cracked, or missing shingles visible from the ground. Any of these means the roof’s water-shedding surface is compromised. A missing shingle in the wrong spot can funnel water directly onto the deck. It is a small repair today and a much bigger problem if ignored through one San Antonio storm season.
• Sagging areas or visible dips in the roofline. A sag is never just cosmetic; it means the decking or a rafter has been compromised by water. This needs a structural assessment before any new material goes on top, and it is not a place for a visual estimate from the street.

Our Process, Step by Step

1. 1
   Written estimate with an on-site inspection. We climb on the roof, take measurements, check the attic with a moisture meter, and look at the existing flashing. Then we give you a written, line-item price. No work starts without that document in your hand.
2. 2
   Material selection and scheduling. We walk you through shingle colors, metal profiles, or TPO thickness options and order the materials. We schedule around your availability, and we confirm the crew’s names and photos before anyone shows up.
3. 3
   Installation day. The crew arrives in marked uniforms, badges in with photo ID, and works through the project. We protect your landscaping and exterior walls, and we keep the property clean at the end of each workday.
4. 4
   Final walkthrough with you. Before we leave, we walk the roof and the property with you. We photograph the completed work, show you the flashing details, and confirm every item on the quoted scope is done.
5. 5
   365-Day Done Right Promise in writing. The guarantee is attached to the final invoice. If anything is not right within a year, Mercer makes it right. You do not chase us; you call the same number and a live person answers.

How Much Does Roof Installation Cost in San Antonio?

Our Service Area Near San Antonio

Mercer Roofing Co San Antonio serves the entire Bexar County area, including home consultations in San Antonio proper, plus regular work in Alamo Heights, Terrell Hills, Castle Hills, Windcrest, Kirby, and Lackland AFB. We also handle Roof Installation in Schertz and Roof Installation in Cibolo for homeowners in the northeastern metro. For a broader look at our services, see Roof Installation in San Antonio. Typical inspection appointments in the metro area happen within 48 hours.

Frequently Asked Questions About Roof Installation in San Antonio

Schedule Your Roof Installation Service in San Antonio Today

You deserve a roof installed by people you can identify before they ever reach your door. Mercer Roofing Co San Antonio is ready to inspect your roof, give you a written price, and complete the work with the 365-Day Done Right Promise behind it. Call (254) 276-4369 for a free, no-obligation estimate. A live person answers 24/7.

Written by Grant Whitlock, Owner at Mercer Roofing Co San Antonio, serving San Antonio since 2000.