CGI Home Additions & ADU Nationwide

CGI Home Additions & ADU: The Tampa Owner’s Guide

If you’re planning a home addition or ADU in Tampa using CGI-compatible materials and methods, a full project typically runs $45,000 to $130,000 for a home addition and $90,000 to $220,000 for a detached ADU, depending on square footage, foundation work, and finish level. Those numbers cover design, permits, materials, labor, and close-out with a written guarantee in your hand. What most owners discover along the way is that the difference between a project that finishes on budget and one that spirals comes down to how the contractor prices the job before the first tool comes out.

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We are Bradford Remodeling Co Tampa, an independent contracting firm and a member of the Garrison Partners family since 2004. We are not affiliated with CGI, but we build with their product lines and install them the way the manufacturer specifies. Curtis Lane runs the crew, and he learned the trade at Los Angeles Trade-Technical College before putting in over two decades of Florida construction work. The man prices a job once, explains every line item, and doesn’t revise the number after the contract is signed.

What Your CGI Addition or ADU Plan Actually Requires

Before pricing anything, you need a scope that accounts for four things. First, the foundation and soil conditions on your specific lot, because Tampa’s sandy soil shifts differently than the clay-heavy ground in other parts of the state. Second, wind-load requirements for your zone, which affect fastener schedules and opening sizes. Third, the roof tie-in detail, which is where most additions leak if the flashing isn’t done exactly right. Fourth, the city’s setback and height restrictions, since Tampa’s residential zoning rules vary by neighborhood and can make or break an ADU plan at the permit stage.

We specify documented name-brand materials throughout, including James Hardie exterior products, GAF roofing components, Therma-Tru doors, and CGI product lines where the plans call for them. Materials with manufacturer specs and warranties that back our own guarantee. Nothing on the truck is a mystery to the homeowner, because the written price lists every line item.

Signs Your Addition or ADU Project Is Heading Off Track

• Framing movement after the walls are up. You’ll see gaps at the corner joints or doors that won’t close square. The cause is usually a footing that was poured without enough compacting underneath, or a wall that was framed too fast before lumber reached its settled moisture content. Correcting it means pulling the affected wall section and rebuilding it true.
• Roof tie-in leaks at the seam. Water stains appear on the ceiling near where the new roof meets the original structure. This is almost always a flashing detail that was skipped or underdone. The fix is straightforward if caught early: remove the affected flashing, re-install with the proper overlap, and reseal the seam.
• Windows and doors that need constant adjusting. In a well-framed addition, the openings hold their dimensions. Movement here points to inadequate headers, low-grade studs, or a wall that wasn’t braced during the rough-in. A door that binds in August can be a year-round problem by January.
• Drywall cracks within the first year. Small cracks at the wall-to-ceiling joint within the first 12 months mean the structure is still settling. That’s a guarantee issue, and any contractor worth his invoice should return to correct it. The Garrison Standard doesn’t allow us to call that “normal.”
• Subfloor bounce or soft spots in the new space. If the floor flexes when you walk across it, the joist spacing or span was calculated incorrectly, or the subfloor material wasn’t up to spec. You’ll feel it underfoot before you ever see it on the surface.

Replacement Cost & What’s Included in Tampa

For a full home addition in Tampa, the installed range is $45,000 to $130,000. A detached ADU lands between $90,000 and $220,000. The spread depends on square footage, whether you’re adding a kitchen or bath, whether the foundation requires additional engineering, and the finish level you choose. A garage conversion runs $30,000 to $80,000, assuming the existing slab and walls are in workable shape.

Here’s how the pricing breaks down:

• Foundation and site work: $8,000 – $25,000 depending on soil conditions and access
• Framing and structural rough-in: $20,000 – $55,000 for a standard addition, more with engineered lumber or steel
• Roofing and exterior envelope: $10,000 – $30,000 including tie-in, underlayment, and finish material
• Mechanical, electrical, and plumbing rough-in: $12,000 – $35,000 depending on fixture count and panel capacity
• Interior finish (drywall, flooring, trim, paint): $15,000 – $45,000 for builder-grade to mid-grade finishes
• Permits and engineering: $3,000 – $8,000, pulled and passed before close-out

Every Bradford Remodeling Co Tampa project gets a written price before work begins. No numbers move at the door. The 365-Day Done Right Promise covers every completed project for a full year: if the work fails inside that window, we return and correct it at no charge. You get the signed guarantee in your hand at close-out, along with a clean site and a documented scope of work.

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