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

Fast, Reliable Home Additions & ADU Across Farmers Branch

Home additions and ADU construction in Farmers Branch typically run $45,000-$130,000 for a tied-on room addition and $90,000-$220,000 for a detached unit, with most projects taking four to eight months from permit to final inspection. Before you sign any contract, you need to know one thing about this city: nearly every home in 75234 was built between 1955 and 1975 on expansive black clay, and that soil fact changes the engineering, the budget, and the permitting path for every single project we take on here. Barrett & Sons has worked these mid-century brick ranches long enough to know what the clay does to a slab over 50 years. Call (877) 610-1318 for a free estimate, and we’ll walk the property with you before you spend a dime.

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

Tom Barrett put his name on this company in 1998, and his sons run the crews that show up in Farmers Branch. That’s not a marketing line. Tom lives close enough to drive through the neighborhoods off Josey Lane and Valley View on a Saturday and see the work we’ve done. When you call the office, a live person answers, not a voicemail box. When something isn’t right, one call brings Tom back. That’s the Home Additions & ADU standard we’ve built the business on for 29 years.

Farmers Branch homeowners tend to be skeptical of contractors, and for good reason. Many of them have already paid a national outfit that quoted one number on the phone and handed them a different bill at the door. We handle pricing the opposite way. Every scope, every allowance, every price change arrives as a written change order before work happens. No surprise invoices at the end. And our 90-Day Done Right Promise is printed on every contract: if it’s not done right, Tom comes back and makes it right, one call.

We also know the local building department, the inspectors who work the Farmers Branch area, and the geotechnical engineers who understand this city’s clay. That matters when a room addition or ADU requires foundation work before framing can start. Permits get pulled on every eligible job. Inspections get signed. We don’t treat permits as optional, because the last contractor most of our customers used told them permits were optional.

Our Home Additions & ADU Services in Farmers Branch

ADU Design & Permitting

An ADU in Farmers Branch starts with paperwork before it starts with concrete. The city’s established neighborhoods have architectural control standards that affect setbacks, height limits, and exterior materials, and a detached unit on a 1960s lot often needs a variance or special approval. We handle the design drawings, the geotechnical review, and the permit package as one scope of work, so you’re not shuttling between an architect, an engineer, and the building department on your own. We’ll also coordinate the written change order process if the city requires something the original design didn’t anticipate.

Garage Conversion ADU

Converting an attached garage into a living unit is one of the most practical ADU paths in Farmers Branch, because the footprint already exists and the walls are already up. But the original slab is the variable. Garages built in the 1960s were poured as flatwork, not as living-space foundations, and they’ve been sitting on Dallas-area clay for 50-plus years. Before we frame interior walls or run plumbing, we evaluate the slab for settlement, cracking, and moisture intrusion, then bring in a geotechnical engineer when the movement looks structural. A garage conversion in Farmers Branch runs $30,000-$80,000 depending on what the slab and the existing framing require.

New Detached ADU

A detached ADU in a Farmers Branch backyard gives you a genuinely separate living space, but it also adds a geotechnical layer that newer suburbs don’t face. Because the existing ranch home’s slab has moved over decades of shrink-swell cycles, the new ADU’s footings need to be engineered in relation to the surrounding soil conditions, not just poured at standard depth. We coordinate the soil test, the pier design, and the footing depth with an engineer before any concrete goes in the ground. Detached ADUs in Farmers Branch run $90,000-$220,000, and the foundation work is usually the line item that separates a durable build from a future problem.

Junior ADU & Interior Conversion

A junior ADU converts existing interior square footage, a spare bedroom plus a kitchenette, or a finished basement area, into a self-contained living space within your current home’s footprint. For Farmers Branch ranches, this often means working within load-bearing walls that have shifted slightly over 50 years, so we check for out-of-plumb conditions before we cut any openings. Interior conversions are usually the fastest ADU path because they don’t require new footings, but they still need proper egress, ventilation, and a separate entrance to meet code.

Trusted Brands We Service in Farmers Branch

When your room addition or ADU calls for finish materials, we install brands you can look up. In kitchens and baths that means Schluter waterproofing systems under tile, Grohe fixtures, and Sterling tubs and shower bases where the spec calls for them. On the roof over a sunroom or enclosed patio, GAF shingles are our standard. We stock local parts for Farmers Branch jobs at our Dallas-Fort Worth office, so a missing trim piece or a wrong-size flashing doesn’t stall your project for a week. And every material allowance gets written into your contract before we order anything.

Common Home Additions & ADU Problems We See in Farmers Branch Homes

• Clay-driven slab movement cracking the tie-in joint. A builder assumes the old slab is stable and ties a new addition directly to it, then differential movement cracks the joint within two seasons of shrink-swell. We check the slab’s elevation and movement history before we frame.
• Detached ADUs separating from their own patios. A homeowner skips a geotechnical review, pours footings at standard depth, and watches the ADU pull away from its concrete patio as the clay expands after fall rains. In Farmers Branch, deep piers are not optional on detached units.
• Second-story additions on slabs not engineered for vertical load. Original post-tension slabs from the 1960s were designed for a single story. Add a second story without checking the slab’s capacity, and you risk slab failure under the new point loads. We verify before we build up.
• Out-of-plumb load-bearing walls complicating interior conversions. On a brick ranch off Josey Lane, our crew opened a scope of work for a 400-square-foot room addition and found the original slab had heaved so badly the load-bearing wall was 1¼ inches out of plumb. We brought in a geotechnical engineer, drove piers under the affected corner, then tied the new addition’s subfloor to the stabilized slab before rough-in. The change order added $8,200, but the owner has a level addition and an inspection sign-off on the foundation work.

Pricing for Home Additions & ADU in Farmers Branch, TX

We Also Serve Cities Near Farmers Branch

Our crews work Addison, Carrollton, Irving, and Coppell regularly, and we know the soil and building conditions in each. If you’re in one of those cities and facing the same aging-slab variables we see in Farmers Branch, we can help. Call (877) 610-1318 and we’ll confirm coverage for your address.

FAQs - Home Additions & ADU in Farmers Branch