Home Additions & Structural Services
Full-Scale Home Extensions
JD Contracting LLC builds complete room additions, multi-room expansions, and second-story additions for Metro Detroit homeowners. Our licensed team navigates Oakland County permits, engineering reviews, and zoning requirements for seamless home extensions.
Full-Scale Home Extensions
What's Included in Our Full-Scale Home Extensions Service
A full-scale home extension means breaking through the structural envelope of your house. You're adding footings, tying into load-bearing walls, cutting a new roof plane, and pulling permits with Oakland County's building department. It's the most complex residential project type there is, and the one where contractor experience makes the biggest difference in outcome.
We manage the entire process: zoning setback verification, structural engineering coordination, permit submission, construction, and final inspection. Oakland County's 62 municipalities each have their own building department and plan review process. We've navigated them all — we know what documentation each department requires, what the common reviewer comments are, and how to keep the project moving through the administrative phases without delays.
The construction phases follow a fixed sequence: foundation, framing, roof tie-in, exterior envelope, mechanical rough-ins, insulation, drywall, and finishes. Exterior materials are matched to your existing house so the addition doesn't read as something built separately. Interior finishes and trim are coordinated to carry through from the existing space into the new one without an obvious transition point.
Get a Free EstimateProject Types
Full-Scale Home Extensions: What We Specialize In
Ground-Floor Additions
We frame and finish new ground-level rooms, from sunrooms to in-law suites, with foundations, roofing, and finishes that blend with your home.
Learn More →Second-Story Additions
Our team reinforces existing walls and foundations, then frames and finishes a full second story with stairs, bedrooms, and bathrooms.
Learn More →Design Coordination
We work with licensed architects to ensure your addition's roofline, windows, and proportions match the existing home's architectural character.
Learn More →Permit Management
Our team prepares site plans, submits permit applications, verifies zoning setbacks, and schedules all required inspections on your behalf.
Learn More →Foundation Engineering
We excavate and pour reinforced concrete footings and frost walls engineered for Michigan soil conditions and local load requirements.
Learn More →Mechanical Extensions
Our licensed trades extend your existing mechanical systems into the new space with properly sized ductwork, circuits, and supply lines.
Learn More →Exterior Material Matching
We source matching siding, roofing, trim, and windows so your addition looks like an original part of the home from every angle.
Learn More →Last updated: May 2, 2026
FAQ
Full-Scale Home Extensions FAQs: Oakland County, Michigan
Home additions in Oakland County typically range from $80,000 to $250,000 or more. Cost depends on square footage, foundation requirements, and interior finishes. Costs vary by scope and complexity. Every project gets a fully itemized written proposal.
Yes, all home additions in Oakland County require building permits, plus electrical, plumbing, and mechanical permits. We handle the entire permit process and inspection coordination.
Most home additions in Metro Detroit take 3 to 6 months from permit approval to final walkthrough. Timeline depends on size, foundation type, and weather. Actual timelines may vary based on project complexity, permit timelines, material availability, and site conditions.
Yes. We match rooflines, siding, trim, and interior details so the addition looks like it was always part of your home, especially important for Oakland County properties.
Full-scale extensions in Oakland County typically range from $100,000 to $300,000 depending on size, foundation type, and finish level. Two-story additions cost more per square foot. Costs vary by scope and complexity. Every project gets a fully itemized written proposal.
A full-scale extension includes site prep, foundation, framing, roofing, siding, windows, insulation, electrical, plumbing, HVAC, drywall, and interior finishes, all managed under one contract.
In most cases, yes. Well-built extensions in Oakland County typically recoup 50 to 70 percent of their cost in added property value, depending on the space added.