How Long Does It Take to Build a Garage Apartment in DFW? A Real Timeline

The Number Homeowners Most Underestimate

Ask most homeowners how long a garage apartment takes to build and they'll guess a few months. The correct answer — for a typical DFW project — is 5 to 9 months from first consultation to tenant move-in.

That's not because construction takes that long. It's because construction is only part of the timeline. Here's what the real schedule looks like.

Phase 1: Design, Site Assessment, and Permit Preparation (Weeks 1–10)

Before a single permit application goes to the city, there's significant preparation:

• —Property assessment and zoning verification: We confirm what's allowed on your specific address, check setbacks, and flag any issues with existing structures. 1–2 weeks.
• —Design development: Architectural drawings, floor plans, and elevations. For a straightforward conversion, 3–4 weeks. Above-garage builds with structural engineering add 2–4 more weeks.
• —Structural engineering (required for above-garage builds): 2–4 weeks for stamped drawings.
• —Permit application preparation: Assembling the full submittal package. 1 week.

Read our full process overview for a detailed walkthrough of each step.

Phase 2: Permitting (Weeks 8–18)

This is the phase that surprises homeowners most. Permitting in DFW cities takes:

• —Fort Worth: 4–8 weeks for a complete application on a typical ADU.
• —Dallas (ADUO zone): 4–8 weeks for standard permit review.
• —Dallas (Board of Adjustment required): Add 8–12 weeks for the BOA hearing before permit submission.
• —Denton: 4–6 weeks — one of the most predictable in DFW.
• —Arlington: 4–8 weeks.
• —Other Tarrant County cities: 4–8 weeks typical.

What slows permits down: Incomplete submittals, requested revisions, and inspector scheduling delays. An experienced builder avoids most of these through complete, clean first submissions. What can't be controlled: Some cities have high permit volume at certain times of year.

Phase 3: Construction (Weeks 16–32)

Once the permit is issued, construction begins. Typical timelines:

Garage conversion: 8–14 weeks. The sequence: demo and rough framing → plumbing rough-in → electrical rough-in → HVAC rough-in → insulation → drywall → finish work → final inspections.

Above-garage apartment: 14–20 weeks. More complex framing, more inspection phases, more structural coordination.

Detached ADU (new construction): 16–24 weeks. Full foundation, framing, roofing, and all MEP systems.

These timelines assume no material delays. Supply chain issues with specific products (windows, certain appliances) can add 2–4 weeks. See our project gallery for examples of what gets built in each phase.

Phase 4: Final Inspections and Leasing (Weeks 28–36)

After construction completes:

• —Final inspections: Separate finals for structural, electrical, plumbing, and mechanical — scheduling takes 1–3 weeks.
• —Certificate of Occupancy (CO): Issued after all inspections pass. Required before tenant move-in.
• —Punch list and cleaning: 1–2 weeks.
• —Listing and leasing: Marketing, screening, and lease execution typically takes 2–4 weeks for a well-priced unit in a good neighborhood.

The Full Timeline Summary

• —Simple garage conversion (Fort Worth): 5–7 months total
• —Above-garage apartment (Fort Worth or Denton): 7–9 months total
• —Detached ADU (any DFW city): 8–12 months total
• —Dallas project with BOA process: Add 2–3 months to any of the above

How to Use This Timeline

Plan your finances for 6–9 months of carrying costs before rental income begins. Don't assume a tenant by month three.

Starting the design process sooner shortens the overall timeline — the permit clock doesn't start until the application goes in, and the application can't go in until the drawings are done. Start the conversation now so there's no unnecessary delay.