9.3

Excelsior Roofing Co.

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1340 Underwood Ave, San Francisco, CA 94124 120 Years in Business

Bay Area Service Hub Review

120 years in business, specializing in residential and commercial roofing with a focus on leak detection and union-quality craftsmanship. As San Francisco's oldest roofing firm, they differentiate themselves by employing exclusively union-trained roofers for superior technical execution on complex city roofs. Best for homeowners seeking long-term reliability and proven expertise for flat, shingle, or tile roofs in San Francisco and San Mateo.

Evaluation Scores

Workmanship
9.0
Quality of work performed
Customer Service
8.5
Responsiveness & communication
Pricing
8.5
Clear & honest pricing
Reliability
8.5
Consistency & dependability
Expertise
9.0
Technical skills & certifications
Warranty Support
8.0
Post-service coverage

Essential Q&A

What makes this contractor stand out?
They are a 100% Union shop with over a century of local history, meaning every technician has completed a rigorous 3-year state-approved apprenticeship.
Who should hire this contractor?
San Francisco homeowners with flat or complex historical roofs who value technical precision and workforce longevity over rock-bottom pricing.
Insider tip
Request an estimate from Mark or Bill Powers directly for their deep historical knowledge of San Francisco roof decks, and be prepared for a lead time as their schedule fills up quickly due to high demand.

Frequently Asked Questions

Is this contractor licensed and insured in California?
Yes. License #448397 is active with a $25,000 contractor bond and workers' compensation coverage.
Does this company offer 24/7 emergency services?
Data not available for verification.
What kind of warranty is provided on their workmanship?
They provide a warranty on labor and materials, with customer reviews specifically mentioning a 5-year guarantee.
Do they provide free estimates or flat-rate pricing?
Yes, they provide free estimates for roofing repairs and replacements in San Francisco and San Mateo.
How long has this business been serving the Bay Area?
They have been serving the San Francisco Bay Area since 1906, making them the city's oldest roofing firm.
Are their technicians background-checked and certified?
Yes, they are a Local 40 Union contractor employing factory-trained and union-certified roofers.

Platform Scorecard

Cross-platform reputation comparison

G Google
4.5 /5
13 reviews
Y Yelp
4.7 /5
155 reviews
BBB BBB
A+
0 complaints (3 yr)
Diamond Certified
Certified
Checkbook.org
91%
superior rating
87 ratings

Services Offered

Gutter Installation Gutter Repair Roof Inspection Roof Repair Roof Replacement Skylight Installation Waterproofing

Areas of Expertise

Built-Up Roofing (Tar & Gravel) Leak Detection Modified Bitumen Slate Roofing Tile Roofing Victorian Home Roofing

Certifications

ARCBAC Member BBB Accredited Union Shop (Local 40) WSRCA Member

Service Areas

San Francisco San Mateo County

Professional Memberships

Associated Roofing Contractors of the Bay Area Counties (ARCBAC) Roofers Union Local 40 Western States Roofing Contractors Association (WSRCA)

License Details

Status Active
Classifications
C-39 - Roofing
Issue Date 1983-07-20
Expires 2027-11-30
Bond Amount $25,000
Workers Comp Active
Disciplinary Actions None

Verify This Information

All data sourced from official platforms

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