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ADU construction in Dallas typically runs $90,000 to $220,000 for a complete detached unit in 2026, with most homeowners landing between $150,000 and $190,000 for a standard two-bedroom build. That range covers everything from foundation to finish work: permits, site prep, framing, mechanicals, drywall, flooring, fixtures, and the final walkthrough. An attached garage conversion runs lower, usually $30,000 to $80,000, because the shell already exists. A full detached ADU with a kitchen and bath will push toward the top of that range in neighborhoods like Preston Hollow or Lakewood, where lot constraints and design expectations add to the bill.
We’ll break down exactly where that money goes below, including line-item costs for excavation, foundation work, rough-in, and finishes. No vague “it depends” without numbers. You’ll see the actual spread for the Dallas market, what moves the price, and where you can trim without cutting corners.
ADU Construction Cost Breakdown (2026)
Here’s the line-by-line breakdown for a typical detached ADU in Dallas. These numbers assume a 600 to 1,000 square foot unit with one bedroom, one bath, and a modest kitchen. Costs shift with square footage, site conditions, and finish level, but this gives you the real working budget.
| Line Item | Typical Range (Dallas, 2026) |
|---|---|
| Design & architectural plans | $5,000 – $15,000 |
| City of Dallas permits & fees | $3,000 – $8,000 |
| Site prep & excavation | $4,000 – $12,000 |
| Foundation (slab or pier-and-beam) | $8,000 – $20,000 |
| Framing (walls, roof structure) | $18,000 – $40,000 |
| Roofing (shingle or metal) | $6,000 – $15,000 |
| Electrical rough-in & finish | $8,000 – $18,000 |
| Plumbing rough-in & finish | $9,000 – $20,000 |
| HVAC (mini-split or tie-in) | $5,000 – $12,000 |
| Insulation & drywall | $6,000 – $14,000 |
| Flooring, paint, trim | $6,000 – $15,000 |
| Kitchen (cabinets, counters, appliances) | $10,000 – $25,000 |
| Bathroom (fixtures, tile, vanity) | $7,000 – $16,000 |
| Site utilities connection | $4,000 – $12,000 |
Total: $90,000 – $220,000
Detached ADUs sit at the top of that range because they require separate utility runs, their own foundation, and full envelope construction. Attached units or garage conversions pull the bottom of the range since the structure and roofline are already there. In Dallas specifically, clay soil means foundation engineering gets more attention than in other markets: expansive soils shift, and a poorly designed slab will crack. That’s a cost you don’t skip, and a big reason we include soil analysis in every ADU estimate.
What drives the price up? A second bathroom, custom cabinetry, higher-end appliances, and any structural work on the existing home if you’re converting. What brings it down? Simple rooflines, utility tie-ins located close to the main dwelling, and selecting mid-grade finishes from our documented brand roster instead of custom work.
What Affects ADU Construction Pricing in Dallas
- Detached vs. attached. A detached ADU requires a new foundation, separate utility trenching, and full exterior walls. That’s $20,000 to $50,000 more than attaching to the existing structure. If your lot in East Dallas has alley access for a detached build, the cost per square foot is often lower than squeezing an addition onto a constrained mid-century footprint.
- Soil conditions and foundation type. Dallas sits on expansive clay in most neighborhoods. Soil analysis runs $500 to $1,500, and the foundation design follows from it. Pier-and-beam will run higher than slab in some cases, but it’s the right call on shifting ground. Skip this and you pay for it in cracked drywall and stuck doors two summers later.
- Utility distance and capacity. If your ADU sits 80 feet from the main electrical panel, expect $3,000 to $8,000 just in trenching and conductor. Older homes in Oak Cliff or Casa View often need a panel upgrade, which adds $2,500 to $5,000 before the ADU wiring even starts. We flag this in the written estimate so it doesn’t surface mid-project.
- Square footage and layout. Every 100 square feet adds roughly $15,000 to $28,000 in total cost. But a well-laid-out 600-square-foot unit costs less per square foot than a chopped-up 800-square-foot one because bathrooms and kitchens are the expensive rooms. One bathroom serving a simple rectangle is the most efficient build.
- Finish level. Builder-grade fixtures versus mid-grade changes the line item meaningfully. KraftMaid cabinetry, Cambria counters, and Kohler fixtures run higher than stock boxes, but they carry manufacturer specs and warranties that survive long after the punch list is signed. Our written price says exactly which grade you’re getting.
- Permitting timeline and scope. The City of Dallas building permit for an ADU runs $3,000 to $8,000 depending on square footage and whether it’s a new build or conversion. Plan review adds time and cost, and any zoning variance for setbacks adds more. We handle the full submittal, but the line item is real and it’s in every estimate.
What Does Dallas Allow for ADUs?
Dallas adopted ADU regulations that permit detached and attached accessory dwelling units in most single-family zoning districts. The specific rules: the unit can be up to 800 square feet or 40% of the main home’s living area, whichever is smaller. Setbacks follow the underlying zone, but interior side and rear setbacks can be reduced to 5 feet for ADUs in many cases. Off-street parking is generally not required for an ADU in Dallas, which saves $3,000 to $8,000 compared to cities that mandate a pad.
Height limits cap detached ADUs at 15 feet to the roof peak in most residential zones. And Dallas requires the ADU to match the primary home’s exterior materials on street-facing elevations, which is why we specify James Hardie siding and GAF roofing to stay compliant while keeping the look consistent. If you’re in a historic district, overlay rules apply and can add design review time and cost. We pull the zoning verification before we price, so the written number accounts for your actual lot, not a generic Dallas assumption.
ADU Construction vs. Garage Conversion: What’s the Price Difference in Dallas?
A detached ADU in Dallas costs $180 to $320 per square foot, all in. A garage conversion lands at $120 to $220 per square foot. The spread comes down to one thing: the garage already has a foundation, roof, and exterior walls. A conversion still requires new electrical, plumbing, insulation, drywall, a bathroom, and a kitchen if you want one, but you’re not building the envelope from scratch.
That said, not every Dallas garage is a clean conversion candidate. Older single-car garages in Forest Hills or Lake Highlands often have slabs that were never meant for living space: they lack proper footings and moisture barriers. We’ve seen $30,000 conversion estimates become $60,000 jobs once the slab had to be demolished and re-poured. Our written price covers the condition we can verify before work starts, and if we find something in demo, it’s documented and approved before any additional work proceeds.
For a full breakdown of what’s involved in a garage conversion versus a new build, see our ADU Construction in Dallas service page. It goes deeper on scope, timeline, and what the finished product looks like with our process.
How to Save on ADU Construction Without Cutting Corners
A few decisions make a real difference in the final number. None of them involve skipping permits or hiring an unlicensed crew.
- Go attached when the lot allows. An attached ADU shares two walls with the main house. That alone drops the price $20,000 to $40,000 in most Dallas builds. If your lot in Richardson or Garland adjacent to Dallas has the side yard space, this is the single biggest lever.
- Standardize the roofline. A simple gable ties into the existing roof and avoids custom trusses, dormers, or flat-roof drainage systems. Every roofline complexity adds $4,000 to $10,000. We draw to the simplest roof that meets code and looks right.
- Keep the bathroom and kitchen adjacent. Stacking the wet walls reduces plumbing runs and the cost of the second vent stack. A back-to-back layout can save $2,000 to $6,000 in materials and labor.
- Pick mid-grade finishes from our documented brands. KraftMaid cabinetry and Moen fixtures are not the cheapest line, but they are spec’d, warranted, and serviceable. The alternative, big-box no-name fixtures, fail inside a year and we’re back on site. The 365-Day Done Right Promise means we carry the cost of failure, so we build to not come back.
- Build in a predictable season. Dallas foundation work runs better when the clay isn’t bone dry and cracking from July heat. Booking your start for early fall or spring avoids weather delays and rushed concrete work. The price doesn’t move much by season, but the schedule does.
For an exact figure on your project, call (903) 326-8963. The estimate is free, it’s in writing, and it’s the number you’ll pay, not a placeholder.
FAQs – ADU Construction Cost in Dallas
How much does a 1-bedroom ADU cost in Dallas?
A one-bedroom, one-bath ADU in Dallas runs $90,000 to $160,000 for a detached build, depending on square footage (typically 400 to 700 square feet) and site conditions. An attached one-bedroom starts closer to $80,000. Call (903) 326-8963 and we’ll give you a written price for your specific lot and scope.
Is it cheaper to build an ADU or convert a garage in Dallas?
A garage conversion is almost always cheaper: $30,000 to $80,000 versus $90,000 to $220,000 for a detached ADU. The existing foundation and roof save you the most. But if the slab is compromised or the garage sits in a poor location on the lot, the cost gap narrows quickly. Get a written estimate before deciding either way.
How long does ADU construction take in Dallas?
A standard detached ADU takes 5 to 9 months from permit submittal to final inspection. City of Dallas plan review adds 4 to 8 weeks up front, and foundation work depends on weather. We provide a written schedule with every estimate and update it weekly, so you’re never guessing when the next trade shows up.
Do I need a permit for an ADU in Dallas?
Yes. Every ADU in Dallas requires a building permit, and detached units require separate utility permits. Our estimate includes the full permit package cost and we submit it. Unpermitted ADUs create title problems when you sell and can be red-tagged by the city. It’s not worth the risk.
What’s the return on an ADU in Dallas?
An ADU in Dallas typically adds $110,000 to $180,000 in appraised value depending on the neighborhood, unit size, and rental income potential. In East Dallas and North Oak Cliff, rental demand for ADUs is steady at $1,200 to $1,800 a month for a one-bedroom. The project pays for itself over time, especially if you’re renting it out. For a precise build cost on your lot, call (903) 326-8963 for a free written estimate.
Why Dallas Homeowners Use Bradford Remodeling for ADU Work
We’re part of the Garrison Partners family, established in 2004, and every project we build in Dallas is held to The Garrison Standard. For an ADU, that standard means a few specific things. The written price you get before any work starts is the price on the final invoice. The 365-Day Done Right Promise covers the completed unit for a full year: if anything we built fails inside that window, we come back and fix it at no charge. The crew on your job is background-checked and uniformed, and you’ll know their names before they walk onto your property. And when you call Bradford Remodeling Co Dallas at (903) 326-8963, a real person answers, not a phone tree. Day or night.
We build ADUs with documented materials: James Hardie siding, GAF roofing, KraftMaid cabinetry, Kohler fixtures, Moen faucets, Cambria or Caesarstone counters. Every one of those names has manufacturer specs and warranties that sit behind our own guarantee. That matters on a standalone structure that has to hold up to Dallas heat, Dallas storms, and Dallas clay.
At job close, here’s what “squared away” looks like: the site is cleaned, the dumpster is gone, the scope is signed off line by line, and you hold a written 365-Day Done Right Promise in your hand before the final payment is processed. That’s The Garrison Code in practice.
If you’re weighing an ADU against the cost of a home addition, attic build, or major remodel, Bradford Remodeling can give you written numbers for each option so you’re deciding with real figures, not guesses. The estimate is free, and it comes with the same standard: a written price, a written schedule, and a written guarantee.
Get a Written ADU Estimate in Dallas
You’ll get a real number for your Dallas ADU, not a range buried in fine print. Call (903) 326-8963 and we’ll schedule a site walk, pull your zoning, and deliver a written price that covers the full scope: permits, foundation, framing, mechanicals, finishes, and the 365-Day Done Right Promise. Curtis Lane leads every estimate and every build for Bradford Remodeling Co Dallas, so the person who prices your project is the person responsible for it getting done right.
Pricing reflects the Dallas market as of 2026. Bradford Remodeling Co Dallas offers free estimates – call (903) 326-8963.
Written by Curtis Lane, Owner at Bradford Remodeling Co Dallas, serving Dallas since 2004.
What Our Customers Say
"Solid job. Small punch list items were done within a few days of the walkthrough."
- Beth K."Painting and drywall repair were flawless. They patched the drywall seams and the paint matches the old wall."
- Cal P."Primary bath redo. Tile is straight, shower pan was flood tested, and the vanity fits perfectly."
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