Roof Installation in the San Gabriel Valley
Roof Installation Free inspection. Honest report. No upsell.
When you're building new — whether it's an ADU under SB1211, a room addition, a garage-to-living conversion, or ground-up new construction — you need a roof installed from scratch, not a replacement. The licensed pros in our SGV network coordinate with your general contractor or work directly with you, handle material specification, permitting, sheathing inspection, underlayment, and installation. You get manufacturer plus workmanship warranties in writing, and the timing is dialed in to your overall build schedule.
When you need roof installation
- →Building an ADU (Accessory Dwelling Unit) under SB1211 or local ordinance
- →Room addition where new roof structure meets existing
- →Garage conversion to living space
- →Ground-up new construction (single-family or multi-family)
- →Reroof after fire or structural rebuild
- →Detached structure (workshop, pool house, ADU garage)
What's included
- ✓Material specification matched to your build plans
- ✓Coordination with your general contractor (or direct-to-homeowner if you're self-managing)
- ✓Permit pulling for the roof scope in your city
- ✓Sheathing inspection and approval before underlayment
- ✓Underlayment, flashing, and ventilation installed to code
- ✓Roofing material installed per manufacturer specification
- ✓Final cleanup and magnetic sweep for nails
- ✓Manufacturer warranty (typically 25 to 50 years on materials)
- ✓Workmanship warranty (typically 5 to 15 years)
What this costs
ADU and addition roof installations in the SGV typically run $8,000 to $20,000. New construction scales from there. Material choice is the biggest cost driver. Free plans review and fixed-price estimate.
How it works
- 1
Plans review and consultation
Send the roof plans (or have your GC send them). The installer reviews specs, materials, ventilation, and flashing detail before quoting.
- 2
Written estimate and timing
Fixed-price estimate covering materials, installation, permits, and cleanup. Timing aligned to your overall build schedule.
- 3
Permits and pre-install inspection
Permits pulled in your city. Sheathing is inspected before any underlayment goes on — if framing isn't right, you find out before the roof goes on, not after.
- 4
Underlayment and flashing
Underlayment, flashing, and ventilation installed to current building code.
- 5
Roofing installation
Roofing material installed per manufacturer specification. Most ADU and addition roofs complete in 2 to 4 days; larger new-construction roofs scale from there.
- 6
Final walkthrough and warranties
Photo documentation, both warranties delivered in writing, magnetic sweep for any stray nails. Coordination with city for final roofing inspection.
Free Roof Inspection
Stop wondering. Start knowing.
Schedule a no-pressure inspection and get a clear, honest report about your roof — including what (if anything) needs work and realistic cost ranges.
- 30-minute on-site inspection
- Written report with photos
- No pressure to do work
- 100% free for SGV homeowners
Roof Installation — frequently asked
How is roof installation different from roof replacement?+
Replacement means tearing off an existing roof and putting a new one on. Installation means putting a roof on where there isn't one yet — new construction, an ADU, an addition, or a garage conversion. Different scope, different pricing, different planning.
How much does new roof installation cost in the San Gabriel Valley?+
ADU and addition roof installations in the SGV typically run $8,000 to $20,000 depending on square footage, material, and complexity. Larger new construction scales from there. Material choice (asphalt vs. tile vs. metal) is the biggest cost driver.
Can you work directly with my GC?+
Yes. Most installations on larger builds run through the general contractor — the roofer handles spec, materials, scheduling, and city inspection coordination directly with the GC.
I'm building an ADU — what's specific to ADU roof installation?+
ADU roofs in California must meet current building code, including ventilation requirements (Title 24) and material fire-rating standards (Class A in most SGV cities). Tying the new ADU roof into the main house roof — if the ADU is attached — requires careful flashing detail to prevent leaks at the joint.
What roofing material is best for new construction?+
For ADUs and additions, you typically want to match the existing main house — both for visual consistency and for permitting in some cities. Composition shingle is the most flexible and affordable choice. Tile (where matching is required) is more expensive but lasts longer. Your installer will spec the right material based on your plans and any HOA/city requirements.
Do you handle the city permit?+
Yes — permits for the roof scope are pulled by the contractor and included in the fixed-price estimate. If your project has a broader building permit (which most ADUs and additions do), the roof permit is typically rolled into that.
What warranties come with new installation?+
Two warranties: a manufacturer warranty on the materials (typically 25 to 50 years) and a workmanship warranty from the contractor (typically 5 to 15 years). Both are delivered in writing at project completion.
How does this coordinate with framing and other trades?+
The roofer comes in after framing and sheathing are complete and approved. If you're self-managing the build, the inspector flags any sheathing issues before underlayment goes on. If you have a GC, the GC coordinates trade sequencing — the roofer slots into the schedule.
Other SGV roofing services
Ready to get started?
Free inspection. Honest report. No pressure, no upsells.