How Much Does a Garage Apartment Cost in Dallas–Fort Worth?

Garage Apartment Cost Ranges in DFW

The cost of building a garage apartment in DFW depends significantly on the type of build. Here are realistic ranges based on projects we've completed across Fort Worth, Dallas, and surrounding cities:

Garage Conversion: $40,000–$100,000. Converting an existing attached or detached garage into livable space. The most cost-effective option because you're finishing what's already there — foundation, walls, and roof exist. Main cost drivers: plumbing rough-in, electrical upgrades, HVAC, insulation, and finish level.

Above-Garage Apartment: $80,000–$200,000. Building a full living unit above an existing garage. You keep the garage below. Cost is higher than a conversion because you're adding new square footage, new structural work, and new MEP systems.

Detached ADU (New Build): $100,000–$300,000+. A standalone structure built from the ground up. Maximum design flexibility, highest rental income potential, and the highest upfront cost. Site conditions (slope, utility proximity, access) significantly affect price.

Cost per square foot: $150–$350 depending on the type of build and finish level. Conversions tend to sit at the lower end of this range; premium detached builds at the upper end.

What Drives the Cost of a Garage Apartment?

Size of the space. More square footage = more materials and labor. Simple math, but worth stating.

New build vs. conversion. Converting an existing structure is almost always less expensive than building new because you're not starting from scratch on foundation, framing, or roofing.

Plumbing and electrical. Adding a kitchen and bathroom to a space that has neither is a significant cost item. Running new supply lines, drain lines, and electrical panel upgrades add up. If the structure already has plumbing roughed in, costs are lower.

Foundation requirements. Detached new builds require a foundation (slab or pier-and-beam). This is one of the larger line items on any ground-up project.

Design and finish level. Basic finish (LVP flooring, stock cabinets, standard fixtures) costs significantly less than premium finish (hardwood, custom millwork, designer fixtures). Finish level is one of the biggest cost levers you control.

Site conditions. A flat lot with easy access and utilities nearby costs less than a sloped lot, a tight alleyway, or a property where utilities need to be extended far.

City permit fees. Permit fees vary by city. Fort Worth and Denton tend to be more affordable. Dallas permit fees are higher and the process takes longer.

Garage Apartment Cost by City

Fort Worth: Garage conversions $40K–$100K | Above-garage $80K–$180K | Detached ADU $100K–$280K. Permit fees $800–$2,500. One of the most cost-effective DFW markets.

Dallas: Garage conversions $50K–$110K | Above-garage $90K–$200K | Detached ADU $120K–$300K. Higher permit complexity and fees vs. Fort Worth.

Mansfield / Aledo / Burleson: Garage conversions $40K–$100K | Above-garage $80K–$185K | Detached ADU $100K–$270K. Affordable labor markets with lower permit complexity than north Dallas suburbs.

Denton: Garage conversions $38K–$90K | Above-garage $75K–$175K | Detached ADU $95K–$250K. One of the most affordable DFW markets.

Arlington / Southlake: Generally in the $45K–$130K range for conversions, up to $400K+ for premium detached builds in Southlake.

How to Budget for a Garage Apartment Project

Total cost = construction + permits + design + contingency. Many homeowners budget for construction only and are surprised by the rest. Here's how to think about it: permits typically add $800–$4,000 depending on city and project type. Design is typically included in our fee. Contingency: budget 10–15% for unknowns, especially on conversions where the existing structure may reveal surprises during demo.

Cost-plus vs. fixed bid. We work on a cost-plus basis, which means you see exactly what we spend — materials, labor, subcontractors — plus our overhead and profit. This is more transparent than a fixed bid, where the contractor builds margin into the number to cover unknowns and you never see the actual costs.

Financing. Most homeowners finance garage apartment projects through home equity loans, HELOCs, or construction-to-permanent loans. Some use cash. We can refer you to lenders who specialize in ADU financing in DFW.

Is a Garage Apartment a Good Investment?

Rental income potential. A well-finished garage apartment in a desirable DFW neighborhood rents for $1,200–$2,400 per month depending on size and location. A $80,000 garage conversion generating $1,400/month pays for itself in under 5 years — before accounting for property value increase.

Property value increase. Adding livable square footage increases both assessed and market value. A $60,000 garage conversion typically adds $50,000–$90,000 in property value, depending on the market. Above-garage apartments and detached ADUs add proportionally more.

Payback period. Depends on the cost of the build and the rental income generated. Garage conversions typically pay back in 5–8 years via rental income. Detached ADUs take longer — 8–12 years — but generate the most income and add the most value.

Comparison to other home improvements. Kitchen and bathroom remodels typically return 60–80 cents on the dollar. A well-done ADU can return $1.00–$1.50+ on the dollar when you factor in rental income potential.