Home Additions & ADU in Addison - One Fixed Price, Permits Handled

Fast, Reliable Home Additions & ADU Across Addison

A room addition or ADU in Addison usually runs $45,000 to $130,000 for a ground-up project, while a garage conversion lands between $30,000 and $80,000. Those are real numbers from real jobs, not a national website guessing at your market. If you live in the 75001 and you have been thinking about more space, call Barrett & Sons Construction at (877) 610-1318. We will walk the lot with you, listen to what you actually need, and give you a written line-item estimate before anything is signed. No allowances that are not on paper. No surprises at the end.

Why Barrett & Sons Construction Is Addison’s Preferred Home Additions & ADU Company

Tom Barrett founded this company in 1998, and his sons run the crews. That matters in Addison because this is not a town where you want a stranger walking your roofline or cutting into your slab. Most of the residential work we see in Addison is on aging multifamily buildings or the few single-family homes tucked between Belt Line Road and the Dallas North Tollway, and those jobs demand a contractor who knows what the Blackland Prairie clay does to a foundation when August hits. We do. The permit inspector works for you, not for me, which is why permits get pulled on every eligible job and inspections get signed before you pay the final draw. Our Home Additions & ADU team handles everything from design to final walkthrough, and Tom answers his own phone.

Our Home Additions & ADU Services in Addison

ADU Design & Permitting

The Town of Addison has its own permitting process, and the inspectors here see a lot of commercial work because of the Belt Line Road corridor. That means residential ADU plans need to be right the first time. We handle the drawings, the Town submittal, and the revisions, then we build to the approved set. A typical detached ADU in Addison runs $90,000 to $220,000 depending on size and finish level.

Garage Conversion ADU

If you have a garage sitting half-empty in the 75001, converting it is usually the fastest path to a rentable unit or a private in-law suite. Most garage conversions in Addison fall between $30,000 and $80,000. The key is insulation and HVAC. A garage built in the late 1990s was never meant to be living space, and Dallas summers will expose that in the first July. We design for the heat load from day one, not after the Sheetrock goes up.

New Detached ADU

A new detached ADU gives you a clean slate but costs more. Figure $90,000 to $220,000 for a well-built unit with a kitchenette, bath, and proper foundation. On Addison’s expansive clay, that foundation is the part you cannot skip. We have seen additions shift a half-inch in a single dry season because someone cut corners on slab design. We do not cut that corner.

Junior ADU & Interior Conversion

When a full addition is not in the budget, converting an existing interior space often works. A junior ADU, which can be a sectioned-off portion of your home with its own entrance and efficiency kitchen, typically falls in the $45,000 to $130,000 range depending on what we are carving out. If you are also thinking about updating the existing part of the house, we handle Kitchen Remodeling in Addison and Bathroom Remodeling in Addison as well, so you are not juggling two contractors on one site.

Trusted Brands We Service in Addison

Windows and doors make or break an addition in Texas heat, which is why we install Simonton, Ply Gem, and CGI products. These are names you can look up. If we are putting a window in a sunroom or an enclosed patio off your Addison home, we would rather install a brand with a published performance spec than something off a van. Parts and replacements stay quick because we stock what Addison jobs actually need.

Common Home Additions & ADU Problems We See in Addison Homes

• Foundation movement from Blackland Prairie clay. Addison sits on expansive soils that shrink in 100°F summers and swell after rain. An addition that is not designed for that cycle will crack drywall within two years. We account for it before the slab is poured.
• Permit surprises from previous work. A lot of Addison properties, especially older single-family homes, have unpermitted prior additions or conversions. When we pull a permit for your new ADU, the Town may flag the old work. We catch that early and fix it in writing.
• HVAC sizing that ignores the actual room. A converted garage or a sunroom needs its own load calculation. Whoever built it originally may have run a duct off the main trunk and called it done. The room never cools. We do it right or we do not do it.
• Grease and utility conflicts on Belt Line Road adjacent properties. If your home is near the commercial corridor, existing grease traps or shared utility easements can complicate an addition. We know Addison’s utility layout well enough to flag these before you spend money on plans.

Pricing for Home Additions & ADU in Addison, TX

Key Takeaways

• Home additions in Addison: $45,000-$130,000.
• Detached ADU: $90,000-$220,000. Garage conversion: $30,000-$80,000.
• Clay soils in the 75001 require foundation design that anticipates seasonal movement.
• Every job includes permits pulled and inspections signed.
• Written change orders before any scope change. No exceptions.

We Also Serve Cities Near Addison

We serve the whole area around Addison, including Home Additions & ADU in Addison neighbors in Carrollton, Farmers Branch, University Park, and Richardson. If you are just outside the town line, call (877) 610-1318 and we will tell you straight whether we can get a crew to your street.

FAQs - Home Additions & ADU in Addison