Detached Garage Conversion in Dallas, TX
A detached garage conversion in Dallas turns a freestanding garage into a fully livable ADU (accessory dwelling unit, which is builder-speak for a self-contained small home on your existing lot). In most Dallas neighborhoods, you can expect to pay between $110,000 and $190,000 for a complete conversion, depending on the garage’s current condition, the finish level you want, and how much new plumbing and electrical work is needed. Lodgewick ADU Dallas handles these from foundation inspection to final paint, and you can reach us at (361) 204-4652 for a written estimate before any work begins.
This page covers what a detached garage conversion actually involves, what it costs in the Dallas market, and how our process works from the first phone call to the day you get your keys. If you’re still deciding between a detached conversion, an attached conversion, or a new build, our Garage Conversion ADU in Dallas page walks through all three options side by side.
Quick answer: Most detached garage conversions in Dallas land between $110,000 and $190,000 and take 4 to 8 months from permit to move-in. We put that number in writing before you sign anything.
When You Need Detached Garage Conversion
A detached garage sits apart from your main house, which changes how the conversion works. Often Dallas homeowners come to us because the garage isn’t earning its keep anymore. Here are the situations we see most:
- The garage is too small or too narrow for modern cars. A 1950s East Dallas one-car garage may fit a compact sedan but not an SUV or truck. Converting gives the space a job it can actually do well.
- You need rental income from your lot. Detached ADUs rent well in Dallas because tenants get privacy from the main house. A studio or one-bedroom conversion usually brings $1,200 to $1,800 per month, depending on the neighborhood.
- Multigenerational living is on the table. An aging parent or adult child gets their own front door, kitchen, and bathroom without the cost of a separate property.
- The garage is used for storage only. If boxes and old furniture are living in a better space than your family is, that square footage can become a bedroom, office, or studio apartment.
- Your lot already has a detached garage. The concrete slab and roof structure are there. That’s a real head start on cost compared to building a new ADU from nothing.
- A rear-lot position works for privacy. Many Dallas lots with alley access have detached garages at the back of the property. These convert cleanly into private units with their own entrance off the alley.
One note that comes up a lot in Oak Cliff and Lakewood: detached conversions need their own electrical feeder from the main panel. If your main service panel is already maxed out, that’s a line item we’ll flag early so there are no surprises in your written price.
Our Detached Garage Conversion Process
Here’s the sequence we follow on a detached conversion in Dallas, start to finish.
- Phone call and site visit. You call (361) 204-4652, a live person answers, and we schedule a walkthrough at your property. Russ Delmar or a member of our team walks the garage, checks the slab, roof, walls, and existing utilities, and takes measurements.
- Written scope and price. We put the scope of work, the materials we’ll use, the total price, and the completion window in writing. No price changes at the door. No verbal “we’ll figure it out later.” It’s all written down. This is The Kingswell Way: say the price before the work.
- Permits and plans. Dallas requires building permits for garage conversions, and your project must meet current building code for living space, including insulation, egress windows, and smoke detection. We prepare and submit the plans and manage the permitting process.
- Foundation, framing, and utilities. Crews inspect and correct the slab, frame interior walls, run new electrical from the main panel, and rough in plumbing for the kitchen and bath. Background-checked, uniformed technicians do the work, and you’ll know exactly who is on your property.
- Mechanical, insulation, and drywall. HVAC goes in (a mini-split system is standard for detached ADUs in Dallas), the space is insulated for Texas summers, and walls are closed up. If you’re using a prefab system from a maker like Plant Prefab or Boxabl, we coordinate delivery and site placement during this phase.
- Finishes, fixtures, and final inspection. Flooring, paint, cabinetry, and trim go in. We schedule the city inspection, correct anything flagged, and walk the finished unit with you before we call it done. You get a written guarantee before we hand over the keys.
A detached conversion typically runs 4 to 8 months in Dallas. The biggest variance comes from permit review times at the city and how much foundation work the existing slab needs.
Detached Garage Conversion Pricing in Dallas
Here’s what we see in the Dallas market right now. These are all-in ranges for a permitted, code-compliant conversion with new electrical, plumbing, HVAC, and basic finishes. High-end finishes, custom cabinetry, and premium appliances push toward the top of each range.
| Project Type | Typical Cost in Dallas | What’s Usually Included |
|---|---|---|
| Studio conversion (300 – 400 sq ft) | $110,000 – $145,000 | One room, small bath, kitchenette, mini-split HVAC, basic finishes |
| One-bedroom conversion (400 – 600 sq ft) | $135,000 – $170,000 | Separate bedroom, full bath, full kitchen, laundry hookup |
| Two-bedroom conversion (600 – 800 sq ft) | $170,000 – $210,000 | Two bedrooms, full bath, full kitchen, separate entry |
| Prefab studio unit (delivered and finished) | $105,000 – $150,000 | Factory-built studio from a maker like Boxabl or Mighty Buildings, site prep, utility connection |
What moves the price in Dallas:
- Foundation condition. Many detached garages in older Dallas neighborhoods like East Dallas and Oak Cliff were built with thinner slabs than a house. If the slab is cracked or uninsulated, we’ll need to address it before framing. That can add $8,000 to $25,000.
- Electrical service. A detached ADU needs its own circuit run from the main panel. If your panel is full or the service is 100 amps or less, a panel upgrade may be required. Budget $2,500 to $6,000 if that’s the case.
- Plumbing distance. The farther the garage sits from the main sewer line, the more trenching and pipe work the job needs. Long runs across a backyard add cost.
- Roof condition. If the existing roof structure is sound, we can often keep it. If it’s sagging or under-framed, we’ll reframe or replace it before interior work starts.
- Finish level. Basic builder-grade finishes versus custom tile, stone counters, and premium fixtures can swing the price $20,000 or more on the same floor plan.
Some homeowners lean toward a prefab or panelized kit to control cost and timeline. We work regularly with systems from Mighty Buildings, Boxabl, Plant Prefab, and Tuff Shed where the lot and budget fit. The prefab route can cut construction time, but you still need site prep, foundation work, utility connections, and finishing, and we handle all of it under the same written price.
You’ll get a written estimate before any work starts. Call (361) 204-4652 to schedule a walkthrough, and we’ll put real numbers on paper for your specific garage and lot.
The Kingswell Guarantee on Detached Conversions
Every detached garage conversion we take on in Dallas operates under The Kingswell Guarantee, and here’s exactly what that means in plain English:
- Written price first. You see the number before you approve anything. No door-knock price changes, no “unforeseen conditions” surprises we should have caught in the walkthrough.
- Real arrival window. When we schedule work, we give you a defined window and we show up in it. Not a four-hour stretch that becomes a no-show.
- Clean job site. The crew leaves the property cleaner than we found it at the end of every workday.
- Written guarantee. Every project comes with a written guarantee. If the work isn’t done right, we come back and make it right, free, for 365 days. That’s the 365-Day Done Right Promise, and it’s in writing on your project before we start.
The word “lodge” means a small house on a larger property. That’s the whole job description for an ADU, and it’s what we build. Russ Delmar runs the Dallas team, and he’s the one who walks your garage with you on the first visit.
FAQs – Detached Garage Conversion
How much does a detached garage conversion cost in Dallas?
A detached garage conversion in Dallas typically costs between $110,000 and $190,000 for a studio or one-bedroom unit of 300 to 600 square feet. Two-bedroom conversions run from $170,000 to $210,000. The spread comes from foundation condition, electrical service, plumbing distance, and finish choices. Call (361) 204-4652 for a written estimate specific to your garage.
Is it cheaper to convert a detached garage or build a new ADU from scratch?
Converting a detached garage is usually 20 to 40 percent cheaper than building a new standalone ADU on a bare patch of lot, because the slab, framing, roof, and some structural work are already done. In Dallas, a new-build ADU often runs $200,000 and up for a small unit, while a conversion of the same finished size might land at $145,000 to $170,000. The caveat: a garage in poor structural condition can narrow that gap quickly. Call (361) 204-4652 for a walkthrough and we’ll tell you honestly which route makes sense on your lot.
Do I need a permit to convert my detached garage in Dallas?
Yes, Dallas requires a building permit for converting a detached garage into living space, and the finished unit must meet current residential building code for insulation, egress, electrical, plumbing, and smoke detection. Lodgewick ADU Dallas prepares and submits the permit package and manages the inspection process as part of your written project price.
Can you convert my detached garage into an ADU I can rent out?
Yes, and it’s one of the most common reasons Dallas homeowners call us. A finished one-bedroom detached ADU in neighborhoods like Oak Lawn, East Dallas, and Lakewood commonly rents for $1,200 to $1,800 per month, depending on size, finish level, and location. Dallas zoning rules for ADUs vary by lot and neighborhood, so we confirm what’s allowed on your specific property before you commit to anything. Call (361) 204-4652 to talk through rental potential on your lot.
How long does a detached garage conversion take in Dallas?
Most detached garage conversions in Dallas take 4 to 8 months from the first site visit to final inspection. The biggest variables are city permit review times and how much foundation or structural work the existing garage needs. Prefab systems from makers like Boxabl or Plant Prefab can shorten the construction phase, but site prep and utility connection still take real time. We’ll give you a written timeline with your written price.
Why Lodgewick ADU Dallas for Your Detached Conversion
Homeowners in Dallas who’ve been through a bad contractor experience usually come to us with the same frustration: the price changed after the work started, or the crew stopped showing up, or a fix failed and no one answered the phone. We built the entire process around not being that company.
You get a written price before work starts. You get a defined arrival window. You get a clean job site. You get a written guarantee that covers the work for 365 days. And when you call with a question at any point, a live person picks up. That’s the entire promise, and it’s written down on every project we do.
If you’re ready to talk about your detached garage, call (361) 204-4652. Russ Delmar will walk the space with you, answer questions straight, and put a real number on paper. Or start with our Garage Conversion ADU overview if you want a broader look at your options first.
Written by Russ Delmar, Owner at Lodgewick ADU Dallas, serving Dallas.
