New Roof Installation in Costa Mesa & Orange County
Rational Roofing Services installs new roofs on additions, custom homes, and ground-up builds across Costa Mesa and Orange County. We're family-owned since 2018, work with in-house crews (no subcontracting), and install GAF Certified and Owens Corning Preferred systems with written workmanship warranties.
Family-owned since 2018, in-house crews
GAF Certified & Owens Corning Preferred Contractor
A brand-new roof is one of the few chances you get to do it right the first time.
Real projects
Photos from our crews
Real new roof installation photos from Rational Roofing jobs across Orange County drop in here.
Signs you need new roof installation
When to call us
Building a new custom home in Orange County
Putting a roof on a second-story addition or ADU
Replacing an outbuilding or detached garage roof
General contractor needs a reliable roofing partner
Architect-spec assembly with manufacturer warranty
Our process
How a Rational new roof installation works
1
On-site planning visit
60–90 min
We meet you (or your GC) on site, review the plans, and confirm the deck, ventilation, and flashing details before we quote.
2
Written, itemized proposal
Within 2–3 business days
Flat-price scope covering underlayment, flashing, ventilation, material, labor, permit, and cleanup. Delivered within 2–3 business days.
3
Permit & scheduling
1–3 weeks
We pull the city permit and coordinate with your GC so we land on the deck the day you need us — no holding up the build.
4
Install to manufacturer spec
2–5 days
Synthetic underlayment, ice-and-water at valleys and penetrations, properly balanced intake/exhaust ventilation, then your shingle, tile, or metal system installed to GAF / Owens Corning spec.
5
Final inspection & warranty registration
Day of finish
City final, magnetic nail sweep, haul-off, and we register your manufacturer system warranty in the homeowner's name.
Transparent pricing
New Roof Installation pricing in Orange County
Every roof is different. Request a free estimate and we'll give you a real, itemized price for your home.
Built for the climate
Specified for Southern California from day one
New construction is the one chance to get the assembly right. We spec your roof for OC sun, salt air, and Santa Ana wind from the underlayment up.
UV-stable underlayment
Synthetic underlayments rated for high-heat exposure — they don't get brittle the way old felt does.
Coastal-grade flashing
Galvanized or stainless within 5 miles of the coast so flashing doesn't rust out years before the shingles.
Balanced ventilation
We size intake and exhaust together so your attic runs cooler and the shingles last their full manufacturer warranty.
People also ask
Common questions
How much does a new roof installation cost?
Every roof is different. Request a free estimate and we'll give you a real, itemized price for your home.
Do you work with general contractors?
Yes. We routinely partner with OC general contractors and architects. We can read plans, coordinate around framing and stucco, and hit the dates your build needs.
Do you pull the roofing permit?
Yes. We pull the city permit and coordinate the final inspection — it's included in our flat-price proposal.
