Metal roofing
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Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Fast, Reliable Roof Repair Across Los Altos
Roof repair in Los Altos typically runs $450 – $1,850 for most leak and flashing fixes, while larger repairs involving decking replacement or multiple valleys fall in the $2,200 – $4,800 range. That’s the honest spread. We don’t quote a penny until we’ve walked the roof and put the number on paper, but you shouldn’t have to call just to get a ballpark.
Brennan Roofing Co San Jose serves Los Altos homeowners with background-checked, uniformed technicians who arrive inside the promised window. We know the housing stock here: mid-century estate homes on oversized lots, mature oaks dropping leaves onto valleys, cedar shakes hiding moss in the shade. That local knowledge changes what we check when we climb up. Call (669) 238-2101 and a live person answers.
Why Brennan Roofing Co San Jose Is Los Altos’s Preferred Roof Repair Company
Los Altos homeowners tend to be specific about who steps onto their roof. They’ve seen what happens when a crew shows up late, quotes one number, then revises it at the door. We don’t operate that way. Every job begins with a written price before any work starts. The number on that paper does not move at the door. That’s the Garrison Standard, and it applies to every repair, every replacement, every visit.
Our technicians are background-checked and arrive in uniform. You know exactly who is on your roof. When a repair is finished, you get the 365-Day Done Right Promise in writing: one full year of coverage, and if the repair fails within that period, we come back at no charge. Travis Oakley leads this location and holds every crew to that standard. The phones are answered by a live person around the clock, no voicemail, no automated system. When water is coming through your ceiling at 2 a.m., that matters.
We serve Los Altos as part of the Garrison Partners family, founded in 2000. Each location is independently owned and operated to the same standard. That means you get a local, accountable crew, not a faceless chain that treats your roof like a ticket number.
Styles & brands we work with
Emergency Roof Repair in Los Altos
Emergency Roof Repair in Los Altos means stopping water intrusion fast: temporary tarping, immediate leak sealing, and a written scope for the permanent fix. Winter storms rolling across the Santa Cruz Mountains can dump enough rain in a week to find every weak point in an aging roof. If a tree limb punctures decking near Foothill Expressway or a valley backs up from oak leaves, water moves inside the house fast. We respond same-day, tarp what needs tarping, and seal the entry point before the next band of rain arrives.
Tarping and Temporary Protection
A torn underlayment or missing shake can let water into the attic every time it rains. We install a proper tarp with furring strips, not a loose sheet that flaps in the wind. The tarp holds until the full repair is scheduled, and we put that schedule in writing before we leave the driveway.
Leak Sealing Before More Rain
Most Los Altos leaks we see during storms trace back to failed flashing around chimneys, skylights, or pipe boots. We seal the breach with compatible materials, check the surrounding shingles for hidden damage, and confirm water stops. The permanent repair price is quoted on the same visit.
Flat Roof Repair in Los Altos
Flat Roof Repair in Los Altos typically addresses built-up or modified bitumen roofs on mid-century additions, carports, and entry overhangs. These roofs fail differently than pitched roofs. Water ponds, seams split, and the joint where a flat roof meets a sloped roof becomes the weak point. In Los Altos, where many homes have had additions built over the decades, we regularly find leaks concentrated at that transition.
Seam and Flashing Failures
Flat roof seams expand and contract through Los Altos’s wet winters and dry summers. Eventually the seam splits. We clean the area, apply the appropriate patch material, and reinforce the flashing points. The repair is either hot-mopped or cold-applied depending on what the existing roof system can take.
Ponding Water and Drainage Correction
Ponding water shortens a flat roof’s life. If we find low spots holding water for more than 48 hours after rain, we’ll tell you. Sometimes the fix is a patch; sometimes it’s adding tapered insulation or a new drain. We explain the options in plain English and put the recommended scope in writing before any work starts.
Trusted Brands We Service in Los Altos
We install and repair materials from GAF, CertainTeed, and Tamko, among others. What matters for roof repair is matching the existing system. A CertainTeed composition roof gets CertainTeed-compatible underlayment and flashing; a GAF architectural shingle gets a shingle from the same family so the repaired area doesn’t read as a patch. We stock common repair components for Los Altos homes, which shortens turnaround on shingle replacement and valley repairs. When a homeowner doesn’t know what’s on their roof, we identify it during the inspection and show them the options before any money is spent.
Common Roof Repair Problems We See in Los Altos Homes
- Hidden rot under moss on cedar shakes. Streets near Foothill Expressway have shaded lots where moss builds for decades. The moss traps moisture, the moisture rots the shake, and the roof leaks from rot that’s invisible from the ground.
- Clogged valleys from oak and redwood debris. Mature trees are a defining feature of Los Altos. Leaves and needles pile into valleys, water backs up under the shingles, and by the time a stain shows on the ceiling, the decking is already wet.
- Failed flashing on skylights and chimneys. Mid-century homes and later remodels introduced skylights, and original chimney flashing is often original to the house. Years of expansion and contraction from wet winters and dry summers loosen the metal until water finds a path.
- Transition leaks where additions meet the original roof. Los Altos has a high concentration of homes with additions. The joint between the original sloped roof and a newer flat or low-pitch section is where we find persistent, repeating leaks that generic patching doesn’t solve.
See the difference
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AfterPricing for Roof Repair in Los Altos, CA
Here’s what we see in Los Altos, in real numbers. Shingle replacement on a small section runs $450 – $900. Flashing repair around a chimney or skylight typically lands between $600 and $1,400 depending on access and how much custom work the metal requires. Vent boot replacement runs $350 – $650. Flat roof patches run $500 – $1,100. A full valley repair, including decking if needed, runs $1,200 – $2,600. If hidden rot extends into the decking, the cost climbs because the bad wood must come out and be replaced before new underlayment and shingles go down. We quote every job in writing before any work starts. Call (669) 238-2101 to schedule a free estimate.
We Also Serve Cities Near Los Altos
Brennan Roofing Co San Jose handles Roof Repair across the south Peninsula. If you’re in Stanford, Palo Alto, Portola Valley, or Sunnyvale, our crews work those same neighborhoods with the same Garrison Standard. The housing stock and tree cover are similar, and so are the repair patterns we see in those areas.
Serving Los Altos, CA - Our Local Coverage Area
We’re based in the Los Altos area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Roof Repair in Los Altos
You usually can’t tell from the ground, which is the point. The signs are soft spots when the roof is walked, shakes that crumble when pressed, or dark staining on the underside of the decking visible from the attic. We inspect shaded sections of cedar shake roofs in Los Altos with a moisture meter and lift suspect shakes to check the decking. If you have moss covering more than a few shingles, schedule an inspection before winter rain. Call (669) 238-2101 for a free estimate.
The right way is to inspect the transition points first, not just the visible surface. A Los Altos addition often introduces a different roofing material where it joins the original section. The repair has to address how those two materials move at different rates through wet winters and dry summers. That means new flashing at the transition, compatible underlayment, and a seal that accommodates movement. A patch that only covers the visual seam will fail again.
Yes. Winter storms push water sideways and pool it in areas that stay dry during light rain. If flashing around a skylight or chimney has a small gap, a normal shower might not find it, but an atmospheric river will. If you see staining after heavy rain but nothing during the dry season, the leak is real and it’s growing. Call (669) 238-2101 and we’ll trace it.
That joint is the most common flat roof failure point in Los Altos additions. The two roof sections expand and contract at different rates, and the flashing originally installed at that transition either loosens or cracks over time. Repair means removing the old flashing, inspecting the decking under it, and installing new metal that can accommodate the movement. A surface patch over that seam will not hold.
The mild Mediterranean climate and long dry summers are gentler on roofing than many regions, but the combination of winter downpours and summer drought causes repeated expansion and contraction. That cycle loosens fasteners and fatigues flashing faster than steady climates do. Tree cover compounds it: constant leaf and needle debris traps moisture and shortens the life of shingles and shakes in shaded sections. A properly executed repair, with correct materials and new flashing, should last the life of the surrounding roof under normal conditions. We back every repair in writing for one full year through the 365-Day Done Right Promise.
Contact Brennan Roofing Co San Jose
If you need roof repair in Los Altos, the fastest path to a firm price is a phone call. (669) 238-2101 is answered by a live person, any hour. We’ll schedule an inspection, walk the roof, and hand you a written quote before any work starts. Travis Oakley and the rest of the crew stand behind the work in writing. That’s the whole arrangement: a price on paper, a uniformed background-checked technician on site, and a one-year written guarantee on every repair.
Written by Travis Oakley, Owner at Brennan Roofing Co San Jose, serving Los Altos and the surrounding South Bay since 2000.