Santa Rosa Based, Serving Sonoma County 
(707) 540-2592 
Mon-Fri: 7AM–5PM | Sat: 8AM–2PM | Sun: Closed
Roofing Contractor in Sonoma, CA
Mario Contreras Roofing serves homeowners and business owners in Sonoma with honest roofing work backed by over 20 years serving Sonoma County. The city of Sonoma has some of the oldest housing stock in the county — historic homes near Sonoma Plaza, along Spain Street and Napa Street, and throughout the older residential neighborhoods date back decades and sometimes over a century. Those homes need a roofer who knows what they are dealing with, and that is exactly what we bring.
Whether you are near the Plaza, out in the Boyes Hot Springs area, or off Arnold Drive toward Glen Ellen, we offer roof repair, roof replacement, roof inspections, gutter installation, and more — for homes and commercial buildings — with straight talk and no pressure.
- 20+ Years roofing homes and businesses throughout Sonoma County including the city of Sonoma.
- Lic. Fully licensed and insured in California on every job we take.
- ES/EN Bilingual service in English and Spanish for Sonoma homeowners.
Why Sonoma Homeowners Choose Mario Contreras Roofing
Sonoma sits in a warm inland valley that gets hot, dry summers and wet winters. That climate puts real stress on roofing materials year after year. Combined with some of the oldest homes in the county, it means many properties in Sonoma are carrying roofs that are long overdue for a close look. We help homeowners get a clear, honest picture of where their roof stands.
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Honest Estimates
We tell Sonoma homeowners what their roof actually needs. If a targeted repair is the right call, we will say so rather than pushing for a full replacement before it is time.
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20+ Years Local Experience
We have worked roofs across Sonoma County for over two decades. We know the older homes around Sonoma Plaza and the range of housing throughout the valley.
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Licensed and Insured
Every job in Sonoma is fully covered. Mario Contreras Roofing is licensed and insured in California so you are protected on every project from start to finish.
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Clean Job Sites
We take care of your property while we work and do a complete cleanup before we leave. Your yard and driveway are left the way we found them.
Roof Repair, Replacement, and More for Sonoma Homes
The Sonoma Valley gets genuine summer heat — temperatures regularly push into the high 90s and above — along with cold, wet winters. That swing between dry heat and heavy rain is one of the harder climate patterns for roofing materials to handle. Shingles expand and contract with the temperature changes, flashings around chimneys and skylights get tested every rainy season, and older roofs that have been through many of these cycles are often well past their best.
Homes near Sonoma Plaza and along Napa Street, Broadway, and the older side streets in town often have original or near-original roof systems that are decades old. Many of them show it. We do thorough inspections so Sonoma homeowners know exactly what they are working with before deciding on repair or replacement.
- Roof repair for leaks, damaged shingles, flashing issues, and worn areas
- Roof replacement for aging or failing roof systems
- Roof inspection to assess condition and catch problems early
- Composition shingle, tile, and metal roofing options available
- Flat roof and TPO systems for commercial properties in Sonoma
- Gutter installation and gutter repair to protect your roofline
Roofing Questions from Sonoma Homeowners
Common questions we hear from homeowners in Sonoma before they get started with a roofing project.
I have an older home near Sonoma Plaza — what should I know about getting a new roof?
Older homes in the Plaza area often have roofs that have been patched and re-patched over the years, which can make it hard to know the true condition underneath. Before committing to anything, a roof inspection is the right first step. We will look at the decking, flashings, ridge, and all the problem areas and give you a straight read on whether a targeted repair will hold or whether a full roof replacement is the better investment. Historic homes sometimes also have details — like original clay tile or unusual pitch angles — that require extra care, and we have experience handling those situations.
How does Sonoma's hot, dry summer affect roofing materials?
The Sonoma Valley gets real heat in summer — regularly above 95 to 100 degrees — and that UV exposure dries out composition shingles over time. The asphalt loses its flexibility, granules shed into the gutters, and shingles start to crack and curl at the edges. When winter rains arrive, those compromised shingles and flashings are the first places water finds a way in. Getting a look at your roof in late summer or early fall — before the first storms — is one of the best ways to avoid a bigger problem.
Do you serve areas near Sonoma?
Yes. Mario Contreras Roofing is based in Santa Rosa and serves all of Sonoma County. We work regularly in Glen Ellen, Sebastopol, Petaluma, and Rohnert Park, as well as throughout the rest of the county. Call us at (707) 540-2592 to confirm we cover your area.
Roofing Contractor Serving Sonoma and All of Sonoma County
Based in Santa Rosa, Mario Contreras Roofing serves homeowners and business owners throughout Sonoma County. Wherever you are, we bring the same honest work and dependable service.
Protect Your Home With Reliable Roofing Services