Lic #1007864 · Santa Clara County · Envelope
Roofing Systems & Waterproofing
Composition, tile, and flat roofing systems with forensic leak diagnostics and full waterproofing.
High-end residential remodels and commercial projects in the heart of Apple country — precision work for precision-minded clients.
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 Cupertino and across Santa Clara 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.
Cupertino remodels are driven by families and its school district — kitchen expansions, garage conversions, and ADUs for multigenerational living top the list. The city's online permit portal keeps submittals moving, and our in-house trades keep occupied-family-home projects clean, quiet, and on schedule.
What's included in Cupertino
Recent roofing work
The process in Cupertino
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 Cupertino — 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.
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Roofing · Cupertino