Lic #1007864 · Sacramento County · General Contracting
Custom ADU & Additions
Detached ADUs, room additions, garage conversions, and JADUs — permitted, engineered, and built to estate standards.
The Capital Region's growth corridor — commercial development, metro residential remodels, and our northern anchor for statewide coverage.
California's ADU laws have unlocked enormous property value, and JMG builds accessory dwelling units and home additions that match the main residence — not prefab afterthoughts. From Los Altos to San Ramon, our ADUs and additions command premium rents and appraisals.
In Sacramento and across Sacramento County, JMG delivers adus & additions under California Contractor's License #1007864 — permitted, inspected, and personally overseen by owner Jerry Guinn. We manage the entire lifecycle: feasibility, design, permitting, utilities, and construction, delivering turnkey units and seamless additions ready for family or income.
Sacramento's older housing stock — the Fab Forties, Land Park, East Sac — rewards contractors who respect original details, while Central Valley heat makes HVAC and envelope work mission-critical. Permits run through the city's Community Development Department, and our retail crews cover the full corridor from the Bay Area to the Valley.
What's included in Sacramento
Recent adus & additions work
The process in Sacramento
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.
ADUs & Additions in Sacramento — FAQ
Feasibility check on your lot, design and 3D rendering, permit submittal, then construction. State law guarantees most ADUs a 60-day ministerial review — we prepare complete packages so that clock never stops.
Related reading
More services in Sacramento
ADUs & Additions in other cities
ADUs & Additions · Sacramento