Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Styles & brands we work with
See the difference
Before
After
Before
After
Before
AfterHow Much Does ADU Construction Cost in Dallas?
ADU construction in Dallas typically costs between $90,000 and $220,000 for a complete unit, with most homeowners spending around $150,000 for a standard one-bedroom accessory dwelling unit of roughly 600 to 800 square feet. The final price depends on whether you build a detached unit, convert a garage, or finish an attached addition, along with your finish selections and site conditions. For a written, no-surprise price on your specific property, call Mason Remodeling Co Dallas at (432) 302-8761; estimates are free.
ADU Construction Cost Breakdown (2026)
Here are the real line-item ranges we see across Dallas, from Garland to Oak Cliff to Far North Dallas. These numbers come from actual project scopes we price every week, not national averages that ignore local labor rates and permit fees.
| Line Item | Typical Dallas Range | Notes |
|---|---|---|
| Site preparation & grading | $4,000 – $12,000 | Includes clearing, leveling, tree root issues common in older Dallas lots |
| Foundation (slab or pier-and-beam) | $8,000 – $22,000 | Expansive clay soils in North Texas often require engineered slabs |
| Framing & structural | $18,000 – $40,000 | Lumber package, walls, roof structure |
| Exterior finishes (siding, brick veneer, roofing) | $12,000 – $30,000 | Dallas zoning often calls for materials that match the main house |
| Rough plumbing | $6,000 – $14,000 | Includes sewer tie-in, supply lines, water heater connection |
| Rough electrical | $5,000 – $12,000 | Panel capacity matters; older Dallas homes may need a subpanel |
| HVAC (mini-split or ducted) | $5,000 – $12,000 | Texas summer heat makes a properly sized unit non-negotiable |
| Insulation & drywall | $5,000 – $11,000 | Spray foam recommended for Dallas heat and humidity |
| Flooring (LVP, tile, or engineered wood) | $3,500 – $9,000 | Material choice swings this number significantly |
| Kitchenette (cabinets, counters, sink) | $6,000 – $18,000 | Compact kitchen packages keep costs lower |
| Bathroom (shower, toilet, vanity) | $7,000 – $16,000 | Shower enclosures and tile work drive variance |
| Doors, windows, trim | $4,000 – $10,000 | Impact-rated windows cost more but meet newer energy codes |
| Permits, plans, engineering | $5,000 – $15,000 | Dallas permit fees plus stamped architectural and structural drawings |
| Utility connections & fees | $2,000 – $8,000 | City of Dallas water, sewer, and electric tie-in costs |
What moves the needle most is the foundation type. If your backyard sits on the expansive clay common in neighborhoods like Lake Highlands or Casa View, the slab has to be engineered for movement. That alone can add $8,000 to $15,000 compared to a standard pour. Garage conversions, by contrast, often sidestep foundation costs entirely because the slab already exists, which is why they land in the $30,000 to $80,000 range rather than the $90,000-plus range of a ground-up build.
What Affects ADU Construction Pricing in Dallas
- Foundation and soil conditions. Dallas sits on a band of expansive clay that shifts with moisture. Engineers routinely specify post-tension slabs or pier systems for new ADUs, and those designs add real money. If your lot is in an area with known movement, like parts of East Dallas near White Rock Lake, expect to pay on the higher end of the range.
- Detached versus attached versus garage conversion. A detached ADU requires new utility runs, a full foundation, and separate exterior walls, which pushes it toward the $150,000-to-$220,000 band. Tying onto an existing structure is cheaper. Converting a garage is the most affordable path because the shell, roof, and slab are already there.
- Dallas development code and zoning. The City of Dallas allows ADUs in most single-family zoning districts, but setbacks, height limits, and lot coverage rules vary by neighborhood. Homes in conservation districts, like parts of Bishop Arts or M Streets, face design review that can add plan revisions and fees.
- Utility capacity. Older Dallas homes often have electrical panels that are already maxed out. Adding a 60- to 100-amp subpanel for the ADU is common and runs $2,500 to $6,000 before you wire a single outlet. Sewer line upgrades are another variable; older cast iron drain lines in neighborhoods like Oak Lawn may need partial replacement to tie in a new unit.
- Finish level. A basic kitchenette with stock cabinets and a fiberglass shower keeps the total near $120,000. Quartz counters, a full tile shower, soft-close cabinetry, and upgraded flooring push it toward $180,000 and beyond. The same floor plan can swing $60,000 based on finishes alone.
- Site access. Narrow lots and limited backyard access mean smaller equipment, more hand-carrying, and sometimes crane time for a pre-built unit. We price access into every bid in writing, so it never shows up as an add-on later.
How to Save on ADU Construction
Saving money on an ADU in Dallas starts with the site choice, not the finishes. Here is what actually moves the number down:
- Convert the garage first. If your garage is structurally sound, a conversion saves $30,000 to $60,000 over a detached new build. You keep the foundation, roof, and three of four walls.
- Keep the kitchenette simple. A compact galley layout with stock cabinets and a standard-depth refrigerator costs half of a full kitchen. The difference between a $6,000 kitchenette and an $18,000 one is real.
- Choose a mini-split HVAC system. A ductless mini-split handles Dallas summers well and avoids $8,000 to $12,000 in ductwork. For a 600-square-foot ADU, one indoor head with a single outdoor condenser works in most cases.
- Standardize dimensions. Framing to standard lumber sizes, using off-the-shelf windows, and avoiding custom angles keeps material waste low and carpenters efficient.
- Get a written price before you commit. This sounds obvious, but in our market it is not universal. Mason Remodeling Co Dallas delivers a written price on every ADU scope before any work starts, which means you can compare line items directly instead of guessing what a verbal estimate actually covers.
Call (432) 302-8761 for a free estimate on your Dallas ADU project. A live person answers around the clock, and you will get a written scope and price, not a ballpark guess.
How Long Does ADU Construction Take in Dallas?
Most ADU projects in Dallas take 6 to 10 months from the first design meeting to final inspection. The variance depends mostly on the City of Dallas permitting timeline, which runs anywhere from 6 to 12 weeks for a standard ADU in a typical zoning district. Design and engineering add 4 to 6 weeks before permit submission. Construction itself typically runs 4 to 6 months once the slab is poured and framing starts. Conservation district review, soil amendments, or utility coordination can each add a month or more. Mason Remodeling Co Dallas provides a written schedule with your written price, so you know both what you are paying and when the work happens.
Does an ADU Add Value to a Dallas Home?
Yes, and the math in Dallas works better than in most markets. A well-built ADU in a neighborhood like Lakewood, Richardson, or Garland typically adds $150,000 to $220,000 in appraised value when it includes a full bath and kitchenette. Rental income is the other side of it. One-bedroom ADUs in Northeast Dallas lease for $1,300 to $1,800 per month, which means a $150,000 unit can pay for itself in roughly 7 to 9 years before appreciation. The key is building to code with proper permits; unpermitted additions do not appraise and complicate a sale. Mason Remodeling Co Dallas pulls permits on every project and documents the build so an appraiser can verify everything.
Is My Dallas Lot Even Eligible for an ADU?
Most single-family residential lots in Dallas can support an ADU, but there are four things to check before you spend a dollar on plans. First is zoning: the City of Dallas ADU ordinance applies to most R-zoned single-family districts. Second is lot coverage: the combined footprint of your main house, the ADU, and all other structures must stay under the maximum for your zoning district, commonly 45% to 50%. Third is setbacks: detached ADUs usually need to sit at least 5 feet from the side and rear property lines. Fourth is parking: Dallas requires one off-street parking space for the ADU unless your property sits within a half-mile of a DART rail station. We verify all four before we price your project, so the quote you receive reflects buildable reality, not wishful thinking.
Permits and Dallas Code Requirements for ADUs
Dallas requires a full building permit, along with separate electrical, plumbing, and mechanical permits for an ADU. Plan review runs through the City of Dallas Development Services Department, and your drawings need a Texas-licensed architect or engineer stamp for structural work. If your property sits in a floodplain, which includes parts of Oak Cliff and areas near the Trinity River, you will also need elevation and drainage approvals. Mason Remodeling Co Dallas handles the permit process on your behalf as part of the construction contract. Every project is pulled with the City of Dallas under the correct permit classifications, which protects you at resale and keeps the unit rentable under city ordinance.
ADU Construction vs. Home Addition: Which Costs More?
An ADU costs more per square foot than a standard home addition. ADUs in Dallas run $150 to $280 per square foot, while a conventional home addition typically lands in the $120 to $200 per square foot range. The difference comes from independent utility connections, a second foundation, and building a full kitchenette and bath into a compact footprint. What an ADU gives you that an addition does not: a fully separate rental unit with its own entrance, its own address, and income potential. If your goal is rental income or a private space for aging parents, the ADU pays off despite the higher per-foot cost.
Is a Garage Conversion Cheaper Than a Detached ADU?
Yes. A garage conversion in Dallas runs $30,000 to $80,000, while a detached ADU with comparable finishes runs $90,000 to $220,000. The garage already has a slab, walls, and a roof, which eliminates the three most expensive line items in a new build. What a garage conversion does not give you is the garage itself. If you have two cars and a Dallas summer hailstorm coming, losing covered parking matters. We walk clients through that trade-off honestly during the free estimate process.
FAQs – ADU Construction Cost
How much does ADU construction cost in Dallas in 2026?
ADU construction in Dallas costs $90,000 to $220,000 in 2026, with most projects landing between $130,000 and $180,000 for a finished one-bedroom unit. Garage conversions start lower, around $30,000, because the existing structure reduces foundation, framing, and roofing costs. For an exact quote on your property, call (432) 302-8761.
Can I build an ADU in Dallas for under $100,000?
A minimal garage conversion can come in under $100,000, but a new detached ADU almost never does once you factor in Dallas permit fees, engineering, and utility connections. The lowest realistic number for a ground-up build is about $90,000, and that assumes basic finishes, a simple site, and no surprises with soil or sewer lines.
How much does a garage conversion cost in Dallas?
A garage conversion in Dallas typically costs $30,000 to $80,000 depending on whether you need HVAC, a bathroom addition, and electrical panel upgrades. Converting an attached two-car garage into a full studio ADU with a kitchenette and bath usually lands between $50,000 and $75,000.
Does Mason Remodeling Co Dallas give free ADU estimates?
Yes. Estimates are free, and every estimate includes a written price before any work begins. Call (432) 302-8761 to schedule yours; a live person answers 24 hours a day, 7 days a week.
Why is ADU construction in Dallas more expensive than in some other Texas cities?
Dallas sits on expansive clay that demands engineered foundations, and the city’s permit and inspection process is more involved than many surrounding suburbs. Labor rates for licensed Dallas trades also run higher than in rural Texas. The combination adds $15,000 to $30,000 compared to building the same unit in a less regulated area.
Written by Isaac Pruett, Owner at Mason Remodeling Co Dallas, serving Dallas homeowners since 2004. Pricing reflects the Dallas market as of 2026. Mason Remodeling Co Dallas offers free estimates – call (432) 302-8761.
What Our Customers Say
"Opened up the wall between kitchen and dining room. They handled the beam and permit and the floor transitions look seamless."
- Wendy A."Written scope, fixed price, and weekly updates. No change orders we hadn't agreed to."
- Carlos H."Bathroom gut job. Replaced the old tub with a walk-in shower and added a niche. Waterproofing was done properly with a flood test before tile."
- Greg L.
