Roof Replacement
San Jose & the South Bay
When a roof reaches the end of its service life, a full tear-off and replacement is typically the right investment — not a patch job, not a layover.
Roof Replacement
Done Right Since 1952
When a roof reaches the end of its service life, a full tear-off and replacement is typically the right investment — not a patch job, not a layover. Keith Roofing has been doing San Jose roof replacements since 1952, and over seven decades we've developed a process that delivers code-compliant, manufacturer-warrantied roof systems with predictable timelines and transparent pricing.
A proper roof replacement involves far more than just removing old shingles and installing new ones. It's a systematic project: permit pulling with the City of San Jose (or your specific city), complete tear-off down to the deck, thorough deck inspection and repair, installation of modern underlayment systems with proper laps, ice-and-water shield at valleys and penetrations, flashing renewal at every chimney, skylight, and wall transition, proper attic ventilation to meet manufacturer warranty requirements, installation of starter course and architectural shingle (or tile, metal, or other material) to manufacturer specification, hip-and-ridge detailing, comprehensive site cleanup with magnetic nail sweep, and manufacturer warranty registration.
Most San Jose homes that need replacement are on their second or third roof. Original 1950s-70s tract homes received their first re-roof in the 1980s-90s, and those are now at or past end-of-service life. Historic Willow Glen and Rose Garden homes may be on their fourth or fifth roof cycle. In every case, proper replacement extends the roof's protection envelope another 25-50+ years while restoring curb appeal and (often) enabling insurance coverage that aging roofs are losing.
A Complete Guide to Roof Replacement in San Jose
When Replacement Becomes the Right Call
Several clear indicators signal that roof replacement — rather than repair — is the appropriate path forward. The most definitive is roof age combined with widespread deterioration. Most asphalt shingle roofs in the San Jose climate deliver 25-30 years of service life. Premium architectural shingles (CertainTeed Presidential, GAF Grand Sequoia, Owens Corning Berkshire) can reach 40-50 years. Concrete tile systems often deliver 50+ years, though underlayment typically needs replacement at the 25-30 year mark (lift-and-relay).
Beyond age, widespread symptoms point to replacement: curling, cupping, or missing shingle tabs across multiple roof sections; granule loss leaving asphalt substrate exposed; visible deck deflection or sagging; multiple active leak locations rather than a single failure point; and significant flashing failures at chimneys, skylights, or wall transitions. When these issues appear together, spot-repair is throwing money at a failing system.
The Technical Sequence of a Proper Replacement
A code-compliant San Jose roof replacement follows a specific technical sequence. First, permit acquisition through the City of San Jose Building Department (200 E Santa Clara St) — typical turnaround is 2-5 business days for residential re-roofs. Second, complete tear-off of existing roof material down to the deck, with comprehensive debris removal. Third, deck inspection and repair — rotten plywood, damaged rafters, skip-sheathing that needs overlay with solid decking. Fourth, underlayment installation using synthetic underlayment (Owens Corning Deck Defense, CertainTeed DiamondDeck, GAF Tiger Paw) with proper 6-inch laps and self-adhered ice-and-water shield (WeatherWatch, StormGuard) at valleys, eaves, and all roof penetrations.
Fifth, flashing renewal — new step flashing at all wall transitions, counter-flashing at chimneys, pipe boots on plumbing vents, skylight flashing kits where applicable. Sixth, starter course installation at eaves and rakes per manufacturer specification. Seventh, field shingle installation with manufacturer-specified nailing patterns (typically 4 nails per shingle on standard-wind applications, 6 nails in high-wind zones). Eighth, hip-and-ridge installation with matching ridge cap material and proper ventilation. Ninth, ventilation upgrades if existing ventilation doesn't meet manufacturer warranty requirements (1 sq ft net free vent area per 150 sq ft of attic floor, balanced between intake and exhaust). Tenth, site cleanup and magnetic nail sweep to remove every stray fastener from lawns, driveways, and walkways.
What Separates Quality Installation from Shortcut Work
The difference between a roof that delivers its full service life and one that fails prematurely is almost always installation quality, not material quality. The industry's most common shortcuts: skipping ice-and-water shield in valleys (reduces warranty coverage and leads to leaks), inadequate deck repair before shingle installation, improperly lapped underlayment, missing or improperly installed flashings, inadequate ventilation, and fasteners driven too deep or too shallow into shingles. At Keith Roofing, our crews are trained to manufacturer specification and we photograph installation details throughout the project for warranty registration and homeowner records.
Signs You Need
Roof Replacement
Roof is 20+ Years Old
Most asphalt shingle roofs begin showing their age at the 20-year mark. Even if there are no active leaks, material deterioration is accelerating. Premium shingles can extend to 30-40 years, but evaluation becomes important once you hit 20.
Multiple Active Leaks
When leaks appear in multiple places on your roof, the underlying system has failed. Individual flashing repairs can address isolated issues, but widespread leaking signals that the overall waterproof envelope is compromised.
Visible Shingle Deterioration
Curling edges, cupped shingles, missing tabs, or exposed fiberglass matting all indicate material failure. When these symptoms span multiple roof sections, replacement is typically more cost-effective than extensive repair.
Granule Loss in Gutters
Asphalt shingle granules in your gutters indicate UV deterioration and reduced protection. Some granule loss is normal over the life of a roof, but significant accumulation during routine cleaning points to a roof past its prime.
Planning to Sell Soon
A new roof is one of the highest-ROI pre-sale investments. It resolves buyer inspection concerns, supports higher listing prices, and provides documentation that lenders and insurance underwriters want to see.
Planning Solar or Major Remodel
Install the roof first. Solar panels mounted on a failing roof create expensive removal-and-reinstall cycles. Any major roof-penetrating remodel (dormer addition, solar tubes, HVAC rework) should coincide with roof replacement if your roof is approaching end-of-life.
Premium Materials
We Install
CertainTeed Landmark
CertainTeed's flagship architectural shingle with a lifetime limited warranty (50-year transferable under SureStart PLUS). Algae-resistant formulation (StreakFighter) is standard. Available in 20+ colors. Typical installed cost: $6-9 per square foot.
GAF Timberline HDZ
Industry-leading architectural shingle with StainGuard Plus (25-year algae warranty), LayerLock fastening technology, and WindProven wind warranty (up to 130 mph). 50-year limited warranty transferable with System Plus. $6-9 per square foot installed.
Owens Corning TruDefinition Duration
Architectural shingle with SureNail Technology (bonding fabric strip for stronger nail holding power) and StreakGuard algae resistance. Limited lifetime warranty. $6-9 per square foot installed.
Monier Lifetile Concrete Tile
Concrete tile in Spanish S-tile, flat tile, and specialty profiles. 50-year manufacturer warranty. Class A fire rated. Significantly higher installed cost ($10-18/sq ft) but 50+ year service life makes it cost-effective long-term.
Eagle Roofing Tile
Concrete and clay tile with broad Bay Area color availability. Class A fire rated. Premium aesthetic for Spanish Revival and Mediterranean architecture. Clay tile reaches 75+ year service life.
Standing-Seam Metal
Premium material with 50+ year service life, Class A fire rating, and excellent solar compatibility. $14-22 per square foot installed. Worth the investment on fire-zone homes and modern architectural applications.
How We Handle
Your Roof Replacement
Free On-Site Inspection & Written Estimate
A Keith Roofing expert comes to your home, walks the roof, inspects the attic for ventilation and leak indicators, photographs conditions, and provides a written line-item estimate. No charge, no pressure. We explain material options, warranty differences, and honest assessment of whether full replacement is the right call.
Material Selection & Financing
We bring physical material samples to your home — color and profile look different in person than in digital photos. We walk you through the warranty differences between materials and certification levels. For homeowners who want to finance, we provide pre-qualification through Hearth Financial (soft credit pull, no impact to score).
Permit Acquisition & Scheduling
We pull the building permit through the appropriate city (San Jose, Santa Clara, Cupertino, Mountain View, Palo Alto — each has its own permit office). Typical permit turnaround is 3-7 business days. We schedule a start date based on permit acquisition, material lead time, and weather forecast.
Tear-Off, Deck Repair & Installation
Complete removal of existing roof material. Deck inspection with photo documentation of any damage discovered. New underlayment installation with proper laps and ice-water shield at critical areas. Flashing renewal at all penetrations. Shingle (or tile, metal) installation to manufacturer specification. Ventilation upgrades as needed.
Final Inspection, Cleanup & Warranty Registration
City building inspector final inspection. Comprehensive site cleanup including magnetic nail sweep across lawns, driveways, and walkways. Debris removal and disposal. Manufacturer warranty registration on your behalf. Delivery of complete documentation package including warranty certificates, permit records, and photo documentation.
Why Homeowners Choose Us
for Roof Replacement
Multi-Manufacturer Certification
We're certified contractors for CertainTeed SureStart PLUS, GAF System Plus, AND Owens Corning Preferred Contractor programs — meaning we can offer enhanced warranties from all three major manufacturers. Most single-manufacturer certified roofers can't match this breadth of options.
73 Years of San Jose Experience
Decades of local work means we know the specific failure modes of San Jose housing stock, the permit processes for every city in our service area, and the material selections that hold up in our specific climate. That experience translates to fewer problems, better outcomes, and warranty work we rarely need to do.
Transparent, Line-Item Pricing
Our estimates break down materials, labor, permits, disposal, and any discovery allowance items separately. You see exactly what you're paying for and why. No bait-and-switch, no surprise change orders mid-project.
Warranty You Can Actually Call
We've been in business since 1952, and we plan to be around for the 50-year lifespan of the roofs we install. When a warranty question comes up 15 years from now, we'll still answer the phone. Many of our clients are now second-generation — we installed their parents' roof.
Recent Roof Replacement
Projects
Projects Featuring
Our Roof Replacement Service
Real Keith Roofing projects where we delivered this service. Click any case study for the full story.
Saratoga Landmark Re-Roof
Full tear-off and re-roof with CertainTeed Landmark Series architectural shingles on a Saratoga estate home.
View Case Study →Campbell Tar-to-Shingle Conversion
Tar-and-gravel tear-off and conversion to 30-year Landmark composition shingle with new gutters and single-ply carport.
View Case Study →
Robertsville Tile Replacement
Full concrete tile roof replacement on a Spanish Revival home with clay accent tile and new underlayment.
View Case Study →
Castlemont Shingle Re-Roof
Full shingle tear-off and re-roof on a Cambrian Park ranch home — architectural shingles, new flashings.
View Case Study →
Willow Glen Historic Shingle
2025 residential shingle replacement in historic Willow Glen — architectural shingles and upgraded underlayment.
View Case Study →
San Jose Apartment Re-Roof
Multi-unit apartment re-roof — Landmark shingle on pitched wings, single-ply on flat carports, full gutter replacement.
View Case Study →Recent San Jose Re-Roofs
Six recent San Jose jobs, each written up in full on our projects page, show how differently a re-roof goes depending on where the house is and when it was built. The common thread is what turned up once the old roof came off. Each summary below covers the house, the decision we made, and what the tear-off found.
Robertsville tile replacement
This builder-grade concrete tile roof from around 1988 was 35 years old and leaking into two rooms. We test-lifted tiles to see whether a lift-and-relay made sense. Too many had micro-cracks and spalling, and matching stock for the profile was scarce, so the roof was fully replaced with new Monier Lifetile. The San Jose permit took two days.
Almaden Valley lift-and-relay
This was the opposite decision on a 1982 hillside home. The 42-year-old tile was sound, and only 4% of the test tiles broke on removal, but the underlayment beneath had long outlived its design life. We lifted the tile, repaired the deck, installed new underlayment, battens and flashings, and relaid the original tile. The hillside access for staging material was written into the permit.
Castlemont Avenue, Cambrian Park
This 1960s single-story ranch had a 23-year-old shingle roof, with granule loss and curling on the sunny slopes. The owners re-roofed before it leaked. The tear-off exposed about 18 sq ft of rotted decking, and we replaced the original box vents with ridge ventilation, because under-ventilation had likely shortened the life of the previous roof.
1928 Willow Glen bungalow
The house was originally roofed in cedar shake, and parts of its deck were still skip sheathing under a 2003 shingle roof. We overlaid those sections with solid sheathing before the new shingles went on, and set new copper counter-flashing at the brick chimney, which three earlier patches had failed to seal. Before specifying anything, we confirmed that the address was outside a historic preservation overlay.
North 5th Street, downtown
This 1920s home had two chimney leaks and a 28-year-old shingle roof. Our assessment found a second, older layer of roofing underneath that the owner did not know about, so both layers came off. About 12 sq ft of rotted decking at the chimney base was replaced before the new underlayment and shingles went down.
San Jose apartment building
This garden-style apartment building had a failing roof and an inlaid gutter that had been hiding rot inside the fascia for years. The existing sheathing was too weak to carry a new roof, so the whole roof got new plywood. The pitched wings received Landmark shingles and the flat carport decks a single-ply membrane. We replaced the fascia and swapped the inlaid gutter for an external seamless system.
On nearly every one of these jobs, the deciding factor was something nobody could see from the ground: rotted decking, skip sheathing, a hidden second layer, or underlayment that had quietly worn out under sound tile. That is why an estimate from us starts in the attic and on the roof, not from a satellite measurement. If you want to know which of these situations your house is in before collecting bids, book a roof inspection in San Jose and we will tell you whether you are looking at a repair, a lift-and-relay or a full replacement.