When to Repair Your Roof vs. Replace It: An Honest Guide for Bay Area Homeowners

It’s the question every Bay Area homeowner eventually asks us: is this roof still worth fixing, or is it time for a new one? Most of the time, the honest answer isn’t a coin flip. It’s written all over the roof, if you know what to look at.

Los Gatos Roofing has been pulling roofs off and putting them back on in Los Gatos, San Jose, and the South Bay since 1978. In that time we’ve seen every kind of premature failure, every kind of hopeful repair, and every kind of roof that lasted longer than it had any business lasting. What follows is the short version of how we actually think about the repair-versus-replace decision when we’re standing on your roof.

Start With the Age — and What to Actually Expect

The first thing we ask is how old the roof is. Then we ask what kind of roof it is. Those two answers do most of the work.

There is a lot of misinformation floating around about roofing material lifespan. Homeowners tell us about their “50-year” composition shingle roof or their “lifetime warranty” shingle — and then we get on the roof and the granules are gone. Here’s the part you never see in the marketing brochure: almost every roofing warranty excludes damage caused by acts of God. In the Bay Area, “acts of God” now includes bomb cyclones, atmospheric rivers, and the sun itself. Warranties are not lifespans. They never have been.

Here’s what actually holds up in this climate, by roofing type.

Asphalt Shingle Roof: 25 to 30 Years (if everything is right)

A properly installed, properly vented asphalt shingle roof in the Bay Area is a 25- to 30-year roof. But “properly” is doing a lot of work in that sentence. A roof with poor exhaust venting cooks the shingles from below — the attic gets hot, the asphalt gets brittle, and what should have been a 28-year roof starts breaking shingles off in 15 mph winds at year 18.

Orientation matters too. The south-facing and west-facing planes of the same roof will always fail first, sometimes by several years. Don’t judge a roof’s age from the front yard if the front of the house faces north — the back slope is doing the real aging.

Wood Shake Roof: 20 to 25 Years (and a different roof than the one you remember)

Wood shake is a dying breed in the Bay Area, and the shakes installed today are a different product than the ones installed in the ’60s and ’70s. After California’s Class C fire ordinance went into effect in the mid-’90s, shakes started coming pressure-treated with fire retardants — the natural oils that used to help the wood age gracefully get pulled out during treatment. That’s why today’s 25-year-old shake roofs are typically dried out, curled, and ready to be replaced.

If you’re trying to assess a shake roof, look for exposed felt paper in the keyways (the slots between shakes) and burn-through holes on the south and west planes. You shouldn’t see any underlayment on a healthy shake roof. If you can see the felt, the sun is already drilling holes in it — and rodents will find those holes long before you do.

Concrete or Clay Tile: It Depends on What’s Under the Tile

Tiles themselves can last decades. The underlayment under them almost certainly can’t. That’s the single biggest misunderstanding homeowners have about tile roofs: the tile you see from the street is not the roof. The underlayment under the tile is the roof. The tile is a rain screen.

A lot of Santa Clara Valley homes built in the ’70s and ’80s have tile installed directly over open spaced-sheathing — no plywood deck, no modern underlayment. There is nothing to repair under those roofs, because there is nothing there. When they leak, the only real fix is a full reroof with new plywood and modern underlayment.

Clay tile roofs are a better candidate for large repairs. The clay is most always installed over a solid plywood deck, and the product does not fade or lose its natural beauty. Clay tile roofs are not as common as concrete tiles, extremely tile-less and custom made in some cases. The negative aspect of clay tile is the lack of warranty and rodent-prone due to the large S shape.

Standing Seam Metal Roof: 50 Years or More

Standing seam metal is the only residential system we install that genuinely earns the 50-year label. The seams are concealed, there are no exposed fasteners to back out, and the panels are thick enough to handle a century of sun without breaking down. It’s a premium product at a premium price — and for the right house, it’s the last roof you’ll ever install.

What a Failing Asphalt Shingle Roof Actually Looks Like

Asphalt shingle is the most common roof in the Bay Area, so it’s worth knowing the signs of roof damage specifically. What we look for, roughly in the order it shows up:

Granular loss. The sand-like grit in your gutters and downspouts is the UV protection washing off. Once it’s gone, the sun starts burning through the asphalt.

Fiberglass sheen. A silvery or gray wash across whole planes of the roof — especially south- and west-facing — means the fiberglass mat is exposed. That’s the roof equivalent of a bald tire.

Cracked or fault-lined shingles. Brittle, cracked shingles are a sign the shingles cooked from below, usually a venting problem.

Shingles in the yard. Once wind starts breaking pieces off, the roof is at end of life.

Rot at the eaves and rafter tails. The edges of the roof get the most water — they always fail first, and exposed rot on the fascia or tails almost always means the shingles above them are finished.

One of these on its own can be a repair. Two or more together, on a 20+ year old roof, usually means it’s time to plan a full roof replacement.

What a Failing Tile Roof Actually Looks Like

Tile is trickier because the tile itself can look fine from the ground while the system underneath is failing. What we watch for:

Multiple leaks in multiple areas within a year or two. This almost always means the underlayment is failing across the roof, not just in one spot.

Broken tiles from foot traffic — a handful is a repair; a field full of them across a solar array is a bigger conversation.

Rodent entry points. Chewed underlayment and active rodent traffic need to be addressed at the underlayment level, not the tile level.

Tile over open sheathing. If the roof is 30+ years old and has no plywood deck, there’s no repair path — only a reroof.

The Kinds of Repairs That Actually Make Sense

Roof repairs make sense on roofs that still have life in them and on isolated damage that doesn’t point to system-wide failure. A few examples we handle every week:

A tree branch falls and breaks tiles on an otherwise healthy 10-year-old tile roof.

A contractor installing an addition does the roof flashing wrong and a single wall intersection is leaking.

A skylight installer damaged the surrounding shingles and the flashing needs to be redone properly.

A squirrel opened a hole in the felt and the decking under it is still sound.

A bath fan or ridge vent retrofit for a roof that was under-vented from day one.

Valley cleanouts and tile re-seating on a concrete tile roof where debris has packed in.

These are real, worthwhile repairs on roofs that aren’t ready for replacement. We do them all the time.

When to Stop Investing in a Dying Roof

The clearest signal is the one homeowners don’t love hearing: multiple leaks, in multiple areas, within a short span of time. When we’ve fixed three different areas of the same 27-year-old asphalt roof in 18 months and a fourth leak shows up, that’s the roof telling you it’s time.

We use a simple rule with homeowners: if we don’t believe the repair will keep you watertight for at least five more years, we’d rather not do it. Spending $2,500 on a repair that fails in a year doesn’t help you — it just delays the inevitable and burns money that should have gone toward the new roof.

“Can I Just Fix the Rotten Wood?” — Almost Never

This is one of the most common questions we get. A homeowner notices rotten rafter tails or soft fascia, wants that repaired, but isn’t ready to replace the roof yet. The problem is that the wood rotted because the roof above it has been shedding water imperfectly for years. Fix the wood without fixing the source and you’ve just reset the clock on a problem that’s still running.

There’s also a cost issue. To properly replace rotted decking and rafter tails, we have to peel back the roofing, do the carpentry, and put the roofing back. Doing that in isolation costs nearly as much as doing it as part of a reroof — and you end up paying for it twice. If you’re seeing wood damage at the eaves, the roof above it is almost always at end of life. The right play is usually to plan the reroof and let the new roof, new gutters, and wood repair all happen in one trip.

What a New Roof Costs in 2026 (Honest Ballparks)

Prices in this trade never go down. Manufacturers raise their material costs every year. Labor in California does the same. A bid you got five years ago is not the bid you’ll get today — and that’s true no matter who you call.

As of this year, in the Bay Area, these are the honest ranges we see:

Asphalt shingle reroof: roughly $1,000 per square (a square is 100 sq. ft.). A typical Santa Clara Valley tract home is 20 to 30 squares, which puts most reroofs in the $20,000 to $30,000 range before add-ons like new gutters, plywood replacement, or upgraded venting.

Tile reroof: roughly $1,200 to $1,500 per square, depending on whether it’s concrete or clay, and how many wall flashings and details have to be reworked.

Standing seam metal: roughly $2,000 per square and up — the true premium product. Going from an asphalt roof to a standing seam metal roof almost always requires new wall flashings and terminations, which is part of why it’s more involved.

Every roof has its own details — pitch, complexity, flashings, decking condition — so these are ballparks, not bids. What we can promise is a written estimate that walks you through exactly what you’re paying for.

The Bottom Line

Roofs fail in predictable ways, and most of the time the repair-versus-replace call isn’t actually close. A 12-year-old tile roof with a broken tile from a satellite installer gets repaired. A 28-year-old asphalt roof with granules in every downspout gets replaced. A 40-year-old tile roof on open sheathing gets a reroof no matter how good the tile still looks.

If you’re not sure which category yours falls into, the next step is an honest look from someone who does this for a living. Los Gatos Roofing has been making that assessment for Bay Area homeowners since 1978, and we’ll tell you the truth — even if the truth is that you don’t need us yet.