Roofing Company in San Diego - Written Price, Workmanship Warranty

Trusted Roofing Company for San Diego Homeowners

Finding a Roofing Company in San Diego usually starts with one worry: who’s actually coming to your door. We solve that before anything else. Mercer Roofing Co San Diego sends every technician’s name and photo to you before the visit, and each one arrives in a clean uniform with a photo ID badge at the door. Founded in 2000 and part of the Threshold Group family, we serve homeowners across San Diego with roof repair, roof installation, and full roofing services. Our crews work throughout the city, from Clairemont to Chula Vista and up through Rancho Bernardo. Call (619) 810-5520 and a live person answers, 24/7.

Call (619) 810-5520

Key Takeaways

• Written price before work starts: no exceptions, no surprises on the invoice.
• 365-Day Done Right Promise: if it’s not right within a year, we make it right.
• Every repair carries a written guarantee: free second visit if the repair fails.
• Threshold Verified technicians: background-checked, identity-verified, photo-badged at the door.
• Live person answers 24/7: not a voicemail, not a callback form, a real human.
• Free estimates: call (619) 810-5520, written line-item quote included.

Roofing Contractor

A roofing contractor is the licensed professional who installs, repairs, and maintains the roof system over your home or business, and in San Diego that means working with materials built for intense UV exposure, Santa Ana winds, and the occasional heavy storm that rolls in off the Pacific. Mercer Roofing Co San Diego handles everything from replacing a few damaged shingles in North Park to a full tear-off and re-roof in Point Loma. For most San Diego homes, a targeted repair runs $350 to $900, while a full shingle re-roof typically falls between $9,000 and $18,000 depending on roof size, pitch, and material choice. Every project starts with a written price, and no work begins without it.

Repairs and Replacement

When flashing fails around a chimney or a valley starts leaking into the attic, you need a roofing contractor who can diagnose the actual cause, not just patch the visible symptom. We inspect the decking, underlayment, and flashing before recommending repair or replacement. If a repair is the right call, you get a written guarantee with it.

New Construction and Additions

Building an ADU in San Carlos or adding a second story in La Jolla means integrating the new roof with the existing structure correctly. Mercer Roofing Co San Diego coordinates with your general contractor on decking, ventilation, and code-compliant underlayment so the new roof ties in cleanly with what’s already there.

Roof Inspection

A roof inspection is a systematic check of your roof’s shingles, flashing, decking, vents, and drainage points to catch problems before they become leaks, and in San Diego’s coastal climate, salt air and intense sun degrade roofing materials faster than most homeowners expect. Mercer Roofing Co San Diego performs inspections for homeowners in neighborhoods like Ocean Beach, Mission Hills, and Tierrasanta, usually taking 60 to 90 minutes on site. A standard residential roof inspection in San Diego runs $150 to $350, and that fee is credited toward any repair work you approve within 30 days. After every inspection you receive a written report with photos and a line-item recommendation list.

Storm and Leak Checks

If water is showing up on a ceiling or along a wall, the leak’s entry point is often nowhere near the stain. Our technicians trace water paths through the attic, checking underlayment and decking for soft spots and checking sealant around penetrations like vents and pipes. We document what we find and explain it in plain English.

Pre-Purchase Roof Assessments

Buying a home in San Diego means knowing exactly what the roof situation is before you sign. We walk the roof with you or provide a written evaluation for your real estate transaction, including remaining useful life estimates and a repair-or-replace recommendation with real dollar figures.

Commercial Roofing

Commercial roofing covers flat and low-slope roof systems on businesses, offices, retail spaces, and multi-unit buildings, and Mercer Roofing Co San Diego has worked with building owners from Barrio Logan warehouses to Kearny Mesa office parks and Mission Valley retail centers. Commercial roof costs in San Diego vary widely by system type: a roof coating application typically runs $3.50 to $7.50 per square foot, while a full TPO or PVC membrane replacement usually falls between $6.50 and $12 per square foot depending on insulation, decking condition, and access. We provide written proposals with line items, and no work starts until you sign off on the price.

Low-Slope Membrane Systems

Flat roofs live or die by their seams and terminations. We install and maintain TPO, PVC, and modified bitumen systems, checking edge metal, scuppers, and interior drains on every service visit. In San Diego’s dry heat, membrane seams can fail from thermal cycling, so our inspections prioritize areas that expand and contract most.

Tenant Improvements and Roof Rights

When HVAC units, solar racks, or exhaust fans go on a commercial roof, every penetration is a potential leak. Mercer Roofing Co San Diego works with commercial property managers to make sure each curb, clamp, and pipe boot is properly flashed and sealed before and after contractor work on the roof.

Metal Roof Installation

Metal roof installation involves fastening interlocking metal panels or standing seam sheets directly to decking or battens, and in San Diego it’s a smart option for homeowners who want a roof that handles UV and wildfire-prone zones better than asphalt strips. Mercer Roofing Co San Diego installs metal roof systems in communities like Ramona, Alpine, and Lakeside, where fire-resistance ratings matter. Metal roof installation in San Diego generally runs $14 to $22 per square foot installed, so a typical 1,800-square-foot roof lands between $25,000 and $40,000 depending on panel profile, gauge, and whether the old roof must be removed first. Every metal roof project includes a written price before we order the first panel.

Standing Seam and Stone-Coated

Standing seam panels offer clean lines and hidden fasteners, while stone-coated steel gives the look of tile or shingle with metal’s longevity. Our crews are trained on both. In fire-prone areas east of San Diego, metal roofing’s Class A fire rating is often the deciding factor for homeowners replacing old wood shake.

Retrofitting Over Existing Roofs

In many San Diego homes, metal panels can be installed over the existing shingle roof if the decking is sound, which means less tear-off debris and a lower total cost. We evaluate decking condition, roof pitch, and existing load before recommending whether a retrofit is appropriate.

Residential Roofing

Residential roofing means installing and maintaining the roof systems that protect single-family homes, townhomes, and small multi-unit properties, and in San Diego that includes everything from Mission Hills Spanish-tile roofs to shingle tract homes in Santee and Chula Vista. Our Roofing Company in National City and across the region handles residential roofing from small repairs to full replacements, with asphalt shingle re-roofs in San Diego typically running $9,000 to $18,000 for an average home, while tile and metal systems run higher. The most common shingle brands we install and service include Owens Corning, IKO, and Atlas, chosen based on your home’s exposure and budget. Every residential project starts with a written price.

Steep Slope and Clay Tile

San Diego has thousands of homes with clay tile roofs, and walking a tile roof without breaking tiles takes training and the right footwork. Our technicians know how to navigate tile roofs safely, replacing broken tiles, resetting ridge caps, and repairing the underlayment beneath. If you hear tiles shifting during Santa Ana winds, that’s a signal to have the roof checked before the next rain.

Attic Ventilation and Insulation Checks

A roof that cooks from below fails faster. On residential jobs, Mercer Roofing Co San Diego checks that intake and exhaust ventilation are balanced and functional, because a hot attic shortens the life of any shingle. If we spot a ventilation problem during an estimate or repair, we include it in our written findings.

Roof Maintenance

Roof maintenance is the ongoing work of keeping your roof clean, sealed, and structurally sound so small problems don’t become expensive leaks, and in San Diego that means keeping an eye on sun-baked sealant, blocked drains during winter rains, and rusting flashing along coastal ridges. Mercer Roofing Co San Diego offers maintenance visits for homeowners from Coronado to Rancho San Diego, with typical maintenance checks between $180 and $350 depending on roof size and accessibility. Maintenance includes clearing debris, checking sealant around penetrations, and a written summary of anything that needs attention, with a real price to fix it.

Seasonal Maintenance Visits

San Diego doesn’t get much rain, but when it comes, it comes hard and fast. The best time for maintenance is late fall, before the first significant storm. We check gutters, downspouts, flashing points, and all sealant, and we address minor fixes on the same visit whenever possible.

After-Repair and Warranty Maintenance

Roof work often carries manufacturer warranty conditions that require periodic inspections. Mercer Roofing Co San Diego documents each maintenance visit with photos and notes, which helps keep your shingle manufacturer warranty intact if a claim is ever needed. We also remind homeowners with older tile or shake roofs when it’s time for a closer look at underlayment.

Roof Coating

Roof coating is a liquid-applied membrane rolled or sprayed across an existing low-slope roof to seal it, reflect UV energy, and extend its life, and in San Diego’s sunny climate it’s one of the most cost-effective ways to buy another 10 to 15 years on a flat commercial or residential roof. Mercer Roofing Co San Diego applies roof coatings on flat and low-slope structures from Otay Mesa commercial buildings to residential flat roof sections in Pacific Beach. Roof coating in San Diego typically runs $3.50 to $7.50 per square foot, or roughly $5,000 to $12,000 for a typical 1,500-square-foot low-slope roof, depending on existing condition and whether reinforcing fabric is needed. Every coating project includes a written price before we start.

Elastomeric and Silicone Coatings

Elastomeric coatings are acrylic-based and work well on roofs with positive drainage, while silicone coatings handle ponding water better. Our technicians evaluate your roof’s drainage and existing surface condition before recommending one over the other. In San Diego’s coastal zones, silicone’s resistance to salt air often makes it the better long-term choice.

Reflectivity and Energy Savings

A white reflective roof coating can lower roof surface temperature by 50 degrees or more on a summer afternoon in El Cajon, and that heat reduction passes through to your building. For commercial property owners, that often translates to lower cooling costs and a more comfortable space for tenants or inventory. We calculate realistic savings ranges in your written estimate.

Free Roof Estimate

A free roof estimate is an on-site visit where we inspect your roof, measure what’s needed, and hand you a written line-item price for the work, and Mercer Roofing Co San Diego provides this at no charge for homeowners across San Diego. The estimate takes 45 to 90 minutes depending on roof size and complexity, and you’ll have the written price in hand before we leave. There’s no pressure and no obligation, and the price we quote is the price you pay, no change orders unless the scope of work genuinely changes and we discuss it with you first. To schedule, call (619) 810-5520 and a live person will set the appointment.

What’s Included in Your Written Estimate

Your free estimate from Mercer Roofing Co San Diego includes material costs by line item, labor hours, disposal and haul-away fees if applicable, and a clear scope of what we will and will not do. We also note any conditions we observe, like soft decking or missing flashing, that could affect the final job. You get all of this in writing, not as a verbal number.

Estimates for Insurance Claims

If a storm damaged your roof and you’re filing an insurance claim, we’ll provide documentation and photos to support your claim. Our written estimate follows the same line-item format insurance adjusters use, which makes it easier for you to compare against their settlement figure. We don’t negotiate with your insurer for you, but we make sure your paperwork is clear and complete.

Brands We Service

Mercer Roofing Co San Diego installs and repairs shingle systems from Owens Corning, IKO, Atlas, and Tamko. Each of these manufacturers offers different profiles, color lines, and warranty structures, and our crews know the installation requirements for each. We’re not locked into one brand, which means the brand recommendation you get is based on your roof’s exposure, your home’s style, and your budget, not on a supplier deal.

We’ve installed Owens Corning Duration shingles throughout Clairemont and Rancho Peñasquitos where wind resistance and SureNail technology matter most. IKO’s architectural shingles show up often in our East County work around La Presa, Bonita, and Casa de Oro-Mount Helix, where heat resistance is the priority. Atlas and Tamko both make solid laminated options we recommend for homeowners who want a specific color match or a mid-range price point. Whether you have one of these brands already on your roof or you’re considering a switch, we can help with either.

Signs You Need a Pro Right Now

• Water stains on ceilings or walls. A stain means water has already breached the roof system. The entry point could be ten feet from where you see the damage, and finding it takes an attic inspection, not a guess.
• Granules collecting in gutters. Asphalt shingles shed granules as they age. If your downspouts are filling with what looks like coarse sand, your shingles are losing their UV protection and nearing replacement age, especially on sun-facing slopes in San Diego.
• Curling, cracked, or missing shingles. Wind, heat, and age cause shingles to curl at the edges or crack. Once the underlying underlayment is exposed to UV, it degrades quickly and leaks follow, often during the first real rain.
• Daylight visible in the attic. Go into the attic on a bright afternoon. If you can see light through the roof decking, water can get in. Soft or sagging decking means rot has already started and needs to be addressed before a re-roof goes over it.
• Flashing pulling away from chimneys or walls. Flashing is the metal that seals the joints where your roof meets a chimney, wall, or skylight. When sealant fails and flashing lifts, water runs straight into the roof deck. This is one of the most common leak sources we repair in San Diego homes.

Our Process, Step by Step

1. 1
   You call and a live person answers. Not a voicemail, not an automated tree. A real person at (619) 810-5520 takes your name, address, and concern, and schedules your free estimate at a time that works for you. Before the technician arrives, we send their name and photo to your phone or email.
2. 2
   Badge at the door, shoes covered or removed. Our Threshold Verified technician arrives in a clean, marked uniform and presents a photo ID badge when you answer. You already know what they look like from the photo we sent. If you’d prefer we go straight to the roof and report back, just say so.
3. 3
   Full roof evaluation with photos. The technician walks the roof, checks the attic if accessible, inspects flashing, decking, underlayment, vents, and drainage, and dates each issue with photos. You get a clear explanation of what’s urgent, what can wait, and what’s fine as-is.
4. 4
   Written line-item price. Before any work begins, you receive a written price for the recommended scope. No verbal numbers, no “we’ll see once we get up there.” If we find something unexpected during the job, we stop and discuss it with you before proceeding.
5. 5
   The work and the written guarantee. Our technicians complete the work as scoped, clean up the site, and walk you through what was done. Every repair includes a written guarantee, and the 365-Day Done Right Promise covers you for a full year after any job. If something’s not right, we make it right.

How Much Does Roofing Company Cost in San Diego?

Our Service Area Near San Diego

Mercer Roofing Co San Diego serves homeowners throughout San Diego County, including Roofing Company in El Cajon and Roofing Company in National City, plus Santee, La Presa, Imperial Beach, Rancho San Diego, Winter Gardens, Casa de Oro-Mount Helix, Alpine, Bonita, and Eucalyptus Hills. For most of these neighborhoods, we’re scheduling free estimates within the same week. If you’re closer to the coast or out east toward Alpine, call (619) 810-5520 and we’ll give you a straight answer on timing.

Frequently Asked Questions About Roofing Company in San Diego

Schedule Your Roofing Company Service in San Diego Today

You’ll know who’s coming to your door before they arrive, and you’ll know the written price before any work begins. That’s how Mercer Roofing Co San Diego has done roofing in San Diego since 2000. Call (619) 810-5520 for your free, no-obligation estimate. A live person answers, 24/7.

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