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?
An ADU (accessory dwelling unit) in Dallas typically costs between $90,000 and $220,000 in 2026, depending on whether you build a detached backyard unit, convert a garage, or finish an attic or basement. Most homeowners in neighborhoods like Lakewood, Bishop Arts, and Preston Hollow land between $130,000 and $190,000 for a finished, permit-ready one-bedroom unit with a kitchen and bathroom. If you’re comparing bids right now, expect roughly $250 to $400 per square foot for new construction, with garage conversions coming in lower at $150 to $250 per square foot.
Before you commit to a number, know this: the single biggest pricing variable in Dallas is whether your lot can handle a detached structure at all. Setbacks, easements, and utility routing vary block by block. We walk every site before quoting, because the written price we give you on day one is the number on the invoice. No change orders hiding behind “unforeseen conditions.”
If you’re still in the research phase, our ADU Construction in Dallas page covers the full process from permits to final paint. This guide is strictly about cost, and we’ll give you real numbers, not ranges that mean nothing.
Key Takeaways: Dallas ADU Pricing at a Glance
- Full ADU build (detached, new construction): $90,000 – $220,000
- Typical one-bedroom ADU: $130,000 – $190,000
- Garage conversion ADU: $30,000 – $80,000 (existing structure keeps costs down)
- Per square foot (new construction): $250 – $400
- Per square foot (garage conversion): $150 – $250
- Biggest cost drivers: foundation type, utility runs, kitchen and bathroom scope, and whether the ADU is attached or detached
- Dallas permits: $2,000 – $7,000 depending on plan review scope and utility tap fees
- Timeline: 6 – 14 months from design to certificate of occupancy
ADU Construction Cost Breakdown (2026)
Here’s where the money goes on a typical detached ADU in Dallas. These are line-item ranges based on current bids we’ve seen and written over the past 18 months, adjusted for 2026 material and labor pricing:
| Line Item | Typical Dallas Range | Notes |
|---|---|---|
| Site prep & foundation | $12,000 – $28,000 | Slab-on-grade is standard; pier-and-beam adds cost on expansive clay soils |
| Framing & shell | $25,000 – $55,000 | Includes roof, siding, windows, exterior doors |
| Electrical rough-in & finish | $8,000 – $18,000 | New subpanel typically required; service upgrade adds $3,000 – $6,000 |
| Plumbing rough-in & fixtures | $10,000 – $22,000 | Water and sewer line runs from the street or main house drive this |
| HVAC (mini-split or ducted) | $6,000 – $14,000 | Dallas summers make this non-negotiable |
| Insulation & drywall | $7,000 – $14,000 | Spray foam runs higher; new energy codes affect this |
| Kitchen (small, full) | $14,000 – $45,000 | Cabinetry, countertop, sink, appliance hookups |
| Bathroom (full) | $9,000 – $28,000 | Walk-in shower runs $4,500 – $12,000 alone |
| Flooring | $3,000 – $8,000 | LVP and tile are the most common choices we install |
| Permits & plan review | $2,000 – $7,000 | City of Dallas development services, utility tap fees |
| Architect/design fees | $4,000 – $12,000 | Some builders bundle this; we provide written design-build pricing |
| Site work & landscaping | $3,000 – $10,000 | Drainage, grading, walkway, sod repair after excavation |
What drives the number up or down? The three big levers are foundation type, utility distances, and finish level. Dallas sits on expansive clay soil that shifts with moisture. A simple slab is cheapest. If your lot has slope or your ADU is far from the alley utility lines, you’ll pay more for trenching and piers. Finish level matters more than most people expect: a basic kitchen with stock cabinets and laminate counters could run $14,000, while the same footprint with KraftMaid cabinets and Cambria quartz tops jumps to $35,000 or more. Those aren’t arbitrary numbers; they’re the difference between builder-grade and brands that carry their own warranties. We install a lot of KraftMaid and Wellborn cabinetry and Cambria, Silestone, and Caesarstone countertops, with Kohler and Moen fixtures in the bath. The products behind the guarantee are as solid as the promise itself.
If you’re considering a home renovation alongside the ADU, the numbers compound, but so do the efficiencies. One mobilization, one permit cycle, one project manager.
What Affects ADU Construction Pricing in Dallas
- Detached vs. attached vs. conversion. A detached backyard unit is the most expensive at $90,000 – $220,000. Attaching to the existing house drops framing and utility costs modestly. Converting a garage runs $30,000 – $80,000 because the shell already exists. But Dallas zoning restricts where each type is allowed, and that restriction is often the real price driver.
- Your lot and soil. North Dallas neighborhoods like Richardson border and Far North Dallas have some of the most reactive clay soil in the metro. If your lot needs soil correction, piers, or a more robust foundation, add $5,000 – $15,000 before you even get to framing. In East Dallas, older lots sometimes have easements that limit ADU placement.
- Utility runs. If your ADU sits more than 40 feet from the water, sewer, or electrical service, trenching costs climb fast. Sewer line depth in Dallas runs 3 – 6 feet depending on the neighborhood, and tapping into the city main involves permits and inspections. Budget $3,000 – $10,000 for utility runs alone.
- Kitchen and bathroom scope. An ADU with a kitchenette (microwave, small sink, mini-fridge) costs far less than a full kitchen with a range, dishwasher, cabinetry, and stone counters. The kitchen line item can swing from $14,000 to $45,000 by itself. A full bathroom runs $9,000 – $28,000 depending on whether you want a tub, a walk-in shower, or both.
- Dallas building code and energy standards. The city enforces the 2021 IECC with local amendments. That means insulation minimums, window efficiency ratings, and HVAC sizing matter. A poorly insulated ADU fails inspection; a well-insulated one costs more up front but less to cool. In a Dallas August, that tradeoff pays for itself.
- Finish level and material choices. Premium brands don’t just look better; they wear better. We specify James Hardie siding on exteriors because it stands up to Texas heat and hail. Kohler and Moen fixtures in the bathroom because they carry solid warranties. Cambria quartz because it’s non-porous and doesn’t stain. These materials add cost at the front end and remove cost from the back end.
How to Save on ADU Construction in Dallas
Saving money on an ADU doesn’t mean cutting corners. It means making deliberate choices before anyone picks up a hammer. Here’s what we tell homeowners who want to keep the number down without building something that fails in five years:
- Convert a garage instead of building new. The shell, roof, and foundation already exist. A garage conversion in Dallas runs $30,000 – $80,000, and most of that goes to insulation, electrical, plumbing, and finishes. That’s a $60,000 – $140,000 difference compared to a detached build. Zoning matters: Dallas requires garage conversions to maintain off-street parking or provide a variance.
- Keep the kitchen simple. A kitchenette with a microwave, compact fridge, and a single sink costs $3,000 – $6,000. A full kitchen with cabinetry, stone counters, and a range costs $14,000 – $45,000. If the ADU is a rental, tenants will want a full kitchen. If it’s for aging parents or a home office, they may not.
- Choose durable, mid-range finishes. LVP flooring instead of hardwood. Quartz instead of marble. A tub-to-shower conversion instead of a custom walk-in. Each choice saves $1,000 – $5,000 and often performs better in Dallas humidity and heat.
- Design for your lot, not against it. If your lot slopes, build on the high side. If your sewer line runs along the west fence, put the bathroom on the west wall. Simple design decisions save $10,000 or more in foundation and trenching work.
- Get a written price before you sign. A vague estimate is not a price. You should see a line-item breakdown with specifics: what materials, what brands, what’s included, what’s not. Penhallow Remodeling Dallas gives every homeowner a written price before any work starts. No verbal ballparks. No “we’ll figure it out later.” The number on day one is the number on the invoice.
Trevor Nash runs our Dallas operation, and his approach is simple: tell you what it costs, tell you what it covers, and show up when we said we would. You can call (940) 204-5368 and get a real person on the phone, any hour, any day. Estimates are free, and they come in writing.
Is It Cheaper to Build an ADU or Buy a Larger House?
In Dallas in 2026, building an ADU is almost always cheaper than moving. The median single-family home in Dallas County priced around $380,000 as of late 2025. A home with an extra bedroom and a mother-in-law suite typically commands a $60,000 – $120,000 premium. Building an ADU for $130,000 – $190,000 gives you a separate, private living space, rental income potential, and no closing costs, agent commissions, or moving expenses. If you plan to stay in the house for at least five years, the ADU pencils out.
That said, financing matters. Dallas homeowners have options: HELOC rates in 2026 sit in the 7 – 9% range for qualified borrowers, construction loans run 8 – 11%, and cash-out refinances depend on your existing rate. We’ve written ADU pricing for all three scenarios. Call (940) 204-5368 and we’ll walk you through what the monthly cost actually looks like on your specific house.
FAQs – ADU Construction Cost in Dallas
How much does a one-bedroom ADU cost in Dallas?
A finished one-bedroom ADU in Dallas typically costs $130,000 – $190,000 for new detached construction, including a full bathroom, a small kitchen, and permits. Garage conversions with the same footprint run $45,000 – $70,000. These are real numbers from bids we’ve written in Lakewood, Casa View, and Old East Dallas. Call (940) 204-5368 for a written price on your specific lot.
What’s the cheapest ADU option in Dallas?
A garage conversion is the cheapest Dallas ADU at $30,000 – $80,000, because the foundation, walls, and roof already exist. The next cheapest is an attached ADU built as an addition off the main house, which runs $90,000 – $150,000 and saves on utility runs and one exterior wall. Budget $30,000 for a minimal conversion with a bathroom and kitchenette.
Do I need a permit for an ADU in Dallas?
Yes. The City of Dallas requires building permits, zoning verification, and plan review for any ADU, whether detached, attached, or converted. Permit and plan review fees typically run $2,000 – $7,000 depending on scope and utility tap fees. Permit costs are included in our written price; you’ll never see a surprise line item at the end of the job.
How long does ADU construction take in Dallas?
A detached ADU takes 6 – 14 months from design to certificate of occupancy. Garage conversions run 4 – 8 months. The biggest schedule variables are plan review turnaround at the city, utility tap scheduling, and weather delays during foundation work. We give every project a written timeline alongside the written price.
Can an ADU add value to my Dallas home?
Yes. A finished ADU typically adds $100,000 – $180,000 of appraised value to a Dallas property, and the rental income potential is real: one-bedroom ADUs in neighborhoods near downtown and along the DART rail lines rent for $1,200 – $2,000 per month. A kitchen remodel alone returns $14,000 – $45,000 in value; an ADU compounds that with rental cash flow.
Get a Written Price for Your Dallas ADU
You shouldn’t have to guess what an ADU costs, and you shouldn’t have to sign anything before you see a number. Penhallow Remodeling Dallas writes the price down before any work starts. We show up within the window we gave you. We leave the site cleaner than we found it. And every job carries the 365-Day Done Right Promise: if something fails inside the guarantee period, we come back and fix it at no charge, in writing, every time.
Call (940) 204-5368 for a free estimate. Trevor Nash and the Dallas team answer the phone 24/7. A live person, not a voicemail. That’s the Kingswell standard, and it has been since 2004.
Pricing reflects the Dallas market as of 2026. Penhallow Remodeling Dallas offers free estimates – call (940) 204-5368.
Written by Trevor Nash, Owner at Penhallow Remodeling Dallas, serving Dallas and surrounding communities with written pricing and guaranteed workmanship since joining the Kingswell family of companies.
What Our Customers Say
"Full home refresh before we sold. They were straight about what was worth doing and what wasn't to get our money back. On time, on budget, and it sold in a week."
- Monica Vaughn"We'd been burned by a contractor before who disappeared halfway. Penhallow finished on time and stood behind everything. The written price gave me peace of mind the whole way."
- Simone Clarke"Redid two bathrooms at once. The crew protected the floors and cleaned up every single day before leaving. Quote was detailed and there were no mystery charges at the end."
- Tricia Dawson
