Full Roof Replacement in San Diego, CA

Full Roof Replacement in San Diego, CA

A full roof replacement in San Diego typically runs between $9,000 and $18,000 for a standard single-family home, with most jobs finished in two to five days. The exact number depends on the size of your roof, the pitch, the shingle you choose, and what’s hiding underneath the old layers. At Mercer Roofing Co San Diego, we put every one of those numbers in writing before any work starts, and we back the finished roof with a 365-Day Done Right Promise.

We’re a local team that’s part of the Threshold Group family, founded in 2000. What that means for you is simple: every technician who steps onto your property is background-checked, identity-verified, and wearing a photo ID badge. Before the visit, you’ll get the technician’s name and photo. When the doorbell rings, you’ll know exactly who’s standing there. If you’re ready to talk through your roof, call (619) 810-5520. If you want a broader look at what replacement involves, start with our Roof Replacement & Installation page.

Call (619) 810-5520 for a free, written estimate on a full roof replacement in San Diego. A live person answers, any hour, any day.

Key Takeaways

• Cost range: $9,000 to $18,000 for most San Diego single-family homes, depending on size, pitch, and shingle type.
• Timeline: Two to five working days for a typical tear-off and replacement.
• Guarantee: 365-Day Done Right Promise in writing, plus manufacturer warranties on shingles.
• Who shows up: Background-checked, photo-badged technicians whose name and photo you receive before arrival.
• Pricing: Written price before any work starts. Always.

How Much Does a Full Roof Replacement Cost in San Diego?

A full roof replacement in San Diego costs between $9,000 and $18,000 for most homes in 2025. The median we see across neighborhoods like Clairemont, North Park, Mira Mesa, and Chula Vista lands around $12,500 for a 1,800 to 2,200 square foot roof with architectural asphalt shingles. Tear-off of old layers adds more; homes with three-tab shingles on the low end, and houses with steep pitches, multiple valleys, or clay tile replacement on the higher end.

Here’s a practical breakdown of what full roof replacement pricing looks like in this city’s market:

• Standard architectural asphalt shingle roof (1,500 – 2,500 sq ft): $9,500 – $15,500
• Steeper pitch or complex roofline (multiple valleys, dormers): Add $1,500 – $4,000
• Tear-off of existing roof layers (per layer): Add $1,200 – $2,500
• Full roof decking replacement (when plywood is compromised): Add $2,800 – $5,500, depending on square footage
• Upgraded shingle lines (Owens Corning Duration, IKO Cambridge, Atlas Pinnacle): Add $1,800 – $4,200
• New flashing, drip edge, and underlayment: Usually included in our quotes; some contractors charge separately ($600 – $1,400)

What actually moves the number? The condition of your roof decking is the big unknown until the old shingles come off. In coastal areas like Ocean Beach and Point Loma, we routinely find decking softened by decades of marine moisture. In East County neighborhoods like La Mesa and El Cajon, the heat cycle causes older plywood to delaminate. If decking is bad, it must be replaced before new underlayment goes down. We show you photos of what we find and give you a written change order before any extra work proceeds. No work starts on anything you haven’t signed off on, at a price you haven’t seen. Call (619) 810-5520 and we’ll walk your roof and put real numbers on paper.

When You Need Full Roof Replacement

Some roofs can be repaired. Others have reached the end. Here’s what full replacement territory looks like in San Diego specifically:

• Your roof is over 20 years old and the shingles are shedding granules. San Diego’s UV exposure is relentless. By year 15 to 18, most asphalt shingles in direct sun lose significant granule coverage, and you’ll see them collecting in gutters and downspouts.
• Multiple leaks in different areas. One leak is often a flashing or vent boot repair. Leaks in three or more spots usually mean the whole membrane under the shingles is failing. Patching every spot costs thousands and buys little time.
• Visible daylight through the attic boards. If you can see light coming through the roof deck from inside the attic, water is getting in too. The decking is compromised.
• Shingles that are curling, buckling, or missing in clusters. Single missing shingles can be replaced. Curling across entire slopes means the shingles are cooked through and the seal strips are gone. Santa Ana winds will find them.
• Water stains on ceilings after heavy winter rains. San Diego gets most of its rain between November and March. If you’re seeing new stains each season, the roof’s waterproofing layer is done.
• You’re planning to sell and the roof shows its age. A failed roof is the number one deal killer in home inspections. Buyers in San Diego’s market have options, and a 20-year-old roof gives them a reason to walk or demand a concession.

When Grant Whitlock walks a roof, he doesn’t try to sell you a replacement you don’t need. If a repair will honestly get you another few years, that’s what we’ll say. But when replacement is the right call, we’ll show you why with photos, measurements, and a written explanation. You deserve to understand your roof, not just take someone’s word for it.

Our Full Roof Replacement Process

Here’s how a full roof replacement with Mercer Roofing Co San Diego goes from first call to final walkthrough:

1. You call, a human answers. No phone tree, no voicemail. A live person picks up 24/7 at (619) 810-5520. We’ll ask about your roof, your neighborhood, what you’re seeing, and schedule a visit at a time that works for you.
2. We send the technician’s name and photo. Before the appointment, you’ll get a text or email with the name and photo of the person coming to your door. When they arrive, they’ll be in a clean, marked uniform and they’ll show you a photo ID badge. You’ll know exactly who you’re letting in.
3. Full roof assessment. The technician inspects the roof, the attic, the flashing, the ventilation, and the drainage. They take photos and measurements. If it’s safe to walk, they’ll walk every slope. If it’s steep tile or fragile, they’ll assess from a ladder where it’s safer.
4. Written, itemized price. You receive a written proposal that breaks down shingles, underlayment, decking (if known), flashing, disposal, and labor. Every line is priced. If we won’t know decking condition until tear-off, the proposal states exactly what additional cost would apply per sheet. No surprises, ever.
5. Scheduling and tear-off. We schedule your replacement, usually within one to three weeks depending on season. The crew arrives at the agreed time, protects your landscaping and exterior walls with tarps, and removes the old roof. Old materials go into a dump trailer, not your driveway.
6. Installation and inspection. New underlayment, flashing, drip edge, and shingles go down in the right order. We install per manufacturer specifications, which matters for warranty coverage. When the crew finishes, the lead technician walks the roof, checks every flashing point and penetration, and cleans up with a magnetic sweeper to catch stray nails.
7. Written guarantee and Done Right Promise. You get a written guarantee on the workmanship, and you’re covered by our 365-Day Done Right Promise. If it’s not right within a year, we make it right. We also register manufacturer warranties on your shingles where the brand offers it.

This process is the same whether you’re in Tierrasanta or Imperial Beach. What changes is the roof, not the standard. Every Mercer Roofing Co San Diego job is held to the Threshold Verified standard: background-checked, identity-verified, photo-badged technicians on every visit. That part is non-negotiable.

Shingle Brands We Install

A full roof replacement means choosing the shingle that will sit on your home for the next 20 to 30 years. We install manufacturer-recognized lines from brands with real warranty backing, and we’ll help you match the right one to your San Diego exposure, slope, and budget. Here are three we install regularly in this market:

• Owens Corning Duration Series: A thicker architectural shingle with strong wind ratings, which matters in canyons and east-facing slopes that catch Santa Ana gusts. The SureNail strip helps hold shingles through seasonal wind events, and the TruDefinition color blends look clean on San Diego’s Spanish-style and modern homes.
• IKO Cambridge: A solid architectural shingle at a friendlier price point. Good color saturation, dependable performance, and widely available. We recommend this line for homeowners who want a quality replacement without paying for premium brand markup.
• Atlas Pinnacle: Known for their HP42 storm-ready design and Scotchgard algae protection. That algae protection matters on north-facing slopes along the coast where marine moisture and shade create ideal conditions for staining. Atlas also owns a steel shingle line for homeowners considering a more fire-resistant profile.

Every shingle we install goes over new underlayment with new flashing and new drip edge. We don’t shingle over old shingles, and we don’t reuse old flashing. The material brand matters, but installation is what makes it last. Both have to be right. Grant Whitlock and his crew install to manufacturer spec every time, because that’s what keeps your warranty valid and your roof tight.

Local Factors That Affect San Diego Roofs

San Diego is not one climate. A roof in Rancho Bernardo faces different stress than a roof in Pacific Beach. Here’s what we see in specific parts of the county and why it shapes how we approach a full replacement:

• Coastal zones (Ocean Beach, Point Loma, La Jolla, Carlsbad): Marine moisture means the underlayment and flashing corrode faster than inland. We use heavier-duty underlayment and inspect every metal penetration for salt corrosion before laying new shingles. In Point Loma, we frequently replace vent pipe flashings that have rusted through in under ten years.
• Inland valleys (Clairemont, Mission Valley, Santee, El Cajon): Extreme heat cycling stresses roof decking. Plywood expands and contracts daily with the temperature swings, and older decking delaminates. We check for soft spots and delamination before we quote, because this is the number one hidden cost in these neighborhoods.
• East County (La Mesa, El Cajon, Alpine, Lakeside): These areas get the full force of Santa Ana winds. Shingles need strong seal strips and wind-rated installation. We see more blown-off ridge caps and lifted shingles in East County than anywhere else in the region.
• Fire-prone zones (parts of East County and North County): Some homeowners choose fire-resistant underlayments or Class A shingle options. Ask us about what’s available for your specific area, and we’ll give you straight answers on cost versus benefit.

This kind of local specificity isn’t marketing. It’s what tells us which underlayment to put down, which flashing to use, and how honest our quote needs to be about decking. When you call (619) 810-5520, we’ll ask where you are and we’ll talk about what roofs in your neighborhood actually go through.

The Mercer Roofing Difference: You Know Who’s Coming

Most roofing companies ask you to open your door to someone you’ve never seen based on nothing more than a logo on a truck. That’s not how we work. Every Mercer Roofing Co San Diego technician is background-checked, identity-verified, and dispatched under the Threshold Verified standard. Before the visit, you get their name and photo. At the door, they show a photo ID badge.

This matters especially if you’re home alone, if you’ve got young kids, or if you’re a senior homeowner who’s had a bad experience with a stranger at the door. It’s the thing most roofers ignore and the thing many of our customers tell us was the reason they called us instead of the other two quotes they had.

Beyond who shows up, here’s what else is in writing before a single nail goes in:

• Written price before work starts. Always. Not a verbal estimate. A written, line-item price.
• Written guarantee on every replacement. The workmanship is guaranteed, and the 365-Day Done Right Promise covers it: if it’s not right within a year, we make it right.
• A live person answers the phone. 24/7. Not a voicemail. Not a form. A human being, any hour.

We don’t do pressure. We don’t do “sign today” discounts. We give you the real numbers, the real process, and the real people who’ll do the work. You decide when you’re ready. Call (619) 810-5520 to start with a free written estimate.

FAQs – Full Roof Replacement

Is it cheaper to repair or replace my roof in San Diego?

It’s cheaper to repair if the roof has a single point of failure like one flashing joint or one vent boot, but if you’re chasing multiple leaks or the shingles are granule-bare and failing across the roof, repair costs add up fast and still leave you with an aging roof. A full replacement in San Diego costs $9,000 to $18,000, while a patch-on-patch approach can hit $3,000 to $6,000 over a few years without solving the underlying problem. Call (619) 810-5520 and we’ll give you an honest read on which path makes sense for your specific roof.

Can you replace my roof the same week?

It depends on our current schedule and your roof’s specifics, but same-week replacement is possible in many cases, especially outside the November-to-March rain window. We’ll tell you the soonest available date when you call, and we’ll keep it. Call (619) 810-5520 for a free estimate and a real timeline, not a vague “soon.”

How long does a full roof replacement take in San Diego?

Most single-family full roof replacements in San Diego take two to five working days from tear-off to final cleanup, depending on roof size, pitch, and decking condition. Rain can extend the timeline, and homes with multiple layers of old roofing take longer on tear-off day. We’ll give you a specific day count in your written proposal.

Do you remove the old roof first?

Yes, we do a full tear-off down to the decking on every replacement, because building on top of old shingles hides decking damage and shortens the life of the new roof. It also lets us inspect every square foot of the deck and show you photos of what’s actually under there, so you’re never guessing what you paid for. Call (619) 810-5520 to schedule a roof assessment and get a written proposal.

Contact Mercer Roofing Co San Diego

If you’re seeing the signs that your roof needs full replacement, don’t wait until the next rain finds its way through. Call Mercer Roofing Co San Diego at (619) 810-5520 any hour of any day. A live person will answer, listen to what’s going on, and schedule a free roof assessment. You’ll get the technician’s name and photo before they arrive, a written price before any work starts, and a written 365-Day Done Right Promise on the finished roof. That’s how a roofing company should work.

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