Roofing Services in Northridge, CA | GN Builders
Your roof is your home’s first line of defense against the elements. Whether you need a full roof replacement, targeted repairs, or a new roof for an addition or ADU, GN Builders provides reliable roofing services for homeowners throughout Northridge and the San Fernando Valley. We’re a licensed general contractor — not a roofing-only subcontractor — which means we manage your roofing project alongside any related structural, framing, or interior work under one contract.
Roofing Services We Provide
Roof Replacement
When repairs are no longer cost-effective, a full roof replacement is the right investment. We remove existing roofing material down to the deck, inspect and repair the sheathing, install new underlayment, and apply your chosen roofing material. Every replacement includes proper flashing at all penetrations, valleys, and edges.
Roof Repair
Missing or damaged shingles, leaking flashing, cracked tiles, and deteriorated underlayment can all be repaired without a full replacement — if caught early. We diagnose the source of leaks and make targeted repairs that stop water intrusion and extend your roof’s life.
Roof Installation for Additions & ADUs
New home additions, room expansions, and ADUs require new roofing that integrates seamlessly with the existing structure. We tie in new roof sections properly so there are no vulnerable transition points.
Flat Roof Installation & Repair
Many Southern California homes and garages use flat or low-slope roofing systems. We install and repair TPO, modified bitumen, and built-up roofing systems appropriate for low-slope applications.
Roof Inspection
Before buying a home, after a storm, or if you notice staining on interior ceilings, a professional inspection identifies issues before they become expensive. We provide written inspection reports with photos.
Gutter Installation & Replacement
Gutters are part of your roofing system. Clogged or improperly sloped gutters cause water to back up under roofing material and damage fascia. We install seamless aluminum gutters and downspouts that direct water away from your foundation.
Roofing Materials We Install
Asphalt Shingles
The most common roofing material in the U.S. — affordable, durable, and available in a wide range of colors. Architectural (dimensional) shingles offer better wind resistance and a more attractive profile than 3-tab. Lifespan: 20–30 years.
Concrete & Clay Tile
The defining roof of Southern California. Clay and concrete tile withstand our heat, sun, and occasional wind events better than most materials. Excellent longevity (40–50+ years) and iconic curb appeal. Heavier than shingles — existing structure must support the load.
Cool Roof / Reflective Roofing
Title 24, California’s energy code, requires cool roof compliance on most residential re-roofing projects. Reflective shingles and coatings reduce heat absorption, lowering cooling costs significantly in the San Fernando Valley’s hot summers.
TPO & Modified Bitumen (Flat Roofs)
For flat and low-slope applications, TPO membrane and modified bitumen are durable, waterproof solutions. TPO is heat-welded for a seamless barrier. Modified bitumen is torch-applied or self-adhering.
Wood Shake & Shingles
Natural cedar shake provides a rustic, textured appearance. Note that LA County has fire hazard regulations that affect wood roofing eligibility — we confirm compliance before any wood roofing installation.
Why Choose GN Builders for Roofing?
Licensed General Contractor — License #1134674. Roofing requires a California contractor’s license. We are fully licensed and carry general liability and workers’ compensation insurance — protecting you from liability if anything goes wrong on your property.
Title 24 Compliance — California’s energy code requires cool roof compliance on most re-roofing projects. We ensure every installation meets current code so your permit closes without issues.
Proper Permitting — Roof replacements in LA County require a permit. We pull all permits and schedule required inspections. An unpermitted roof can create problems when you sell your home.
Integrated with Larger Projects — Replacing a roof while doing an addition or renovation? We coordinate roofing with framing, insulation, and interior finishes — no separate roofing contractor to manage.
Detailed Written Estimates — We inspect your roof in person, document current conditions with photos, and provide a written estimate that itemizes materials, labor, and any known repairs needed to the deck or structure.
Our Roofing Process
1. Free Inspection & Estimate
We inspect your roof from the exterior and attic (when accessible), document damage or wear, and provide a written estimate. We photograph all problem areas so you understand exactly what we found.
2. Material Selection
We review your options — material type, color, manufacturer, and warranty level — and help you select what’s right for your home, HOA requirements, and budget.
3. Permit Application
We apply for the roofing permit with the City of Los Angeles or LA County, depending on your jurisdiction.
4. Tear-Off & Deck Inspection
We remove existing roofing material and inspect the sheathing below. Damaged or soft decking is replaced before new material goes on — skipping this step is how leaks come back.
5. Installation
Underlayment, ice and water shield at vulnerable areas, and your chosen roofing material are installed per manufacturer specs and local building code. All flashing is replaced or installed new.
6. Inspection & Cleanup
We schedule the city inspection, clean the jobsite thoroughly (magnetic nail sweeps for your yard), and walk the completed roof with you before closing the permit.
Areas We Serve
Northridge · Chatsworth · Granada Hills · Canoga Park · Reseda · Van Nuys · Woodland Hills · West Hills · Porter Ranch · Tarzana · Encino · Sherman Oaks
Frequently Asked Questions — Roofing
How do I know if I need a repair or a full replacement?
A repair makes sense when damage is isolated — a few missing shingles, a failed flashing detail, or a small area of deterioration on a roof that’s otherwise in good condition. If your roof is over 20 years old, has multiple problem areas, or the underlayment has failed, replacement is usually more cost-effective than repeated repairs. We’ll give you an honest assessment after the inspection.
Do I need a permit to replace my roof in Los Angeles?
Yes. The City of Los Angeles and LA County both require permits for roof replacements. The permit process also requires Title 24 cool roof compliance documentation. GN Builders handles all of this — you don’t need to do anything.
How long does a roof replacement take?
Most residential roof replacements take 2–4 days. Tile roofs take longer than shingle due to the weight and installation process. Larger homes or roofs with complex geometry may take up to a week.
My ceiling has a water stain — is it definitely a roof leak?
Not always. Water stains can come from plumbing leaks, HVAC condensation, or window flashing failures. A roof inspection will determine the source. We’ll trace the leak path and identify the origin before recommending any repair.
What warranty comes with a new roof?
Manufacturer warranties on materials typically range from 25 years to lifetime depending on the product line. We also provide a workmanship warranty on our installation. We’ll document all warranty details in your project contract.
Is my roof covered by homeowner’s insurance?
Roofs damaged by wind, hail, or falling trees are often covered. Roofs that have simply worn out over time are generally not. After a storm, we can document damage with photos to support your insurance claim — though the final determination is made by your insurer.
Get a Free Roofing Estimate
Don’t wait for a small leak to become a major repair. Call GN Builders at (323) 372-7272 or submit a contact form to schedule your free roof inspection and estimate. We respond within one business day.
License #1134674 | 17416 Superior St, Northridge, CA 91325 | Serving the San Fernando Valley