Lic #1007864 · San Francisco County · Envelope
Roofing Systems & Waterproofing
Composition, tile, and flat roofing systems with forensic leak diagnostics and full waterproofing.
Retail flagship maintenance, high-rise improvements, and Victorian-era remodel expertise in one of the world's most demanding building environments.
JMG installs and repairs roofing systems built for California microclimates — from wind-rated composition shingles in the East Bay to clay tile estates in Saratoga and cool-roof flat systems on commercial corridors.
In San Francisco and across San Francisco County, JMG delivers roofing under California Contractor's License #1007864 — permitted, inspected, and personally overseen by owner Jerry Guinn. Our leak-detection protocols trace water intrusion to its source before we ever lift a shingle, saving owners from repeat repairs and interior damage.
San Francisco builds answer to DBI — and often to the Planning Department's historic-preservation review. Soft-story retrofits, Victorian and Edwardian renovations, and multi-trade tenant improvements across the city's retail corridors: JMG navigates the permits, the neighbors, and the logistics of building in a dense city.
What's included in San Francisco
Recent roofing work
The process in San Francisco
Private Consultation
Walk the property with owner Jerry Guinn. Honest scope, realistic timeline, and a written line-item estimate — free.
Design & 3D Rendering
See the finished project in photorealistic 3D before a single wall comes down. Finishes get locked before demo day.
Permits, Handled
Plans, submittals, corrections, and city or county coordination under CA License #1007864. You sign — we run the process.
Build & Final Inspection
Sixteen in-house trades on one schedule, one accountable owner. Inspection passed, walkthrough done, keys in hand.
Roofing in San Francisco — FAQ
Most composition-shingle re-roofs run three to five working days; tile and flat systems run longer. We tear off only what we can dry-in the same day — your home is never left open overnight.
More services in San Francisco
Roofing in other cities
Roofing · San Francisco