Lic #1007864 · Contra Costa County · Design & Planning
In-House Architect & Engineer
Architectural design and structural engineering under the same roof as construction — one team designs, permits, and builds.
Blackhawk-adjacent luxury — gated-community remodels, outdoor living construction, and estate grounds work.
Most projects stall in the handoff between designer, engineer, and builder. JMG eliminates it: architectural design, structural calculations, Title 24 energy compliance, and permit-ready construction drawings are produced in-house and coordinated directly with the crews who will build them.
In Danville and across Contra Costa County, JMG delivers architect & engineering under California Contractor's License #1007864 — permitted, inspected, and personally overseen by owner Jerry Guinn. From custom estate architecture in Atherton to engineered tenant improvements for national retail brands, every design decision is made with real construction knowledge — so what gets drawn is exactly what gets built, on budget and on schedule, under California Contractor's License #1007864.
Danville projects often answer to two authorities: the Town's building division and an HOA design-review board — Blackhawk most famously. We prepare HOA submittal packages, manage the town's permit process, and build the estate remodels, outdoor structures, and ADUs that define Diablo-adjacent living.
What's included in Danville
Recent architect & engineering work
The process in Danville
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.
Architect & Engineering in Danville — FAQ
Not with JMG. Design, structural engineering, and permitting happen in-house — one contract and one accountable team from first sketch to final inspection, which removes the most common source of delays and change orders.
Related reading
More services in Danville
Architect & Engineering in other cities
Architect & Engineering · Danville