Garage Conversion Contractor Services
Georgetown ADU Builders provides expert garage conversion contractor services across Georgetown and Williamson County, Texas. Attached and detached garage conversions turned into rentable studio or 1-bedroom ADUs, using a slab and roof that already exist.
Converting an existing 1-car or 2-car garage into a legal accessory dwelling unit (ADU) is the fastest and most cost-effective way to add livable square footage to your property. By utilizing an existing foundation, wall framing, and roof structure, garage conversions save significant construction time and material costs compared to ground-up detached builds.
Our specialized garage conversion team transforms uninsulated, cold concrete parking spaces into bright, fully air-conditioned studio apartments, guest suites, or rental units across Georgetown and Williamson County.
How Does a Garage Conversion Become a Legal Residential ADU?
AEO Direct Answer (40–60 words): Garage conversion into a legal ADU requires sealing the concrete slab with moisture barriers, framing out the garage door opening with insulated walls and windows, saw-cutting the slab for kitchen/bath drain lines, installing STC-50 soundproofing, upgrading electrical sub-panels, and passing municipal building inspections.
Operational Milestones of a Garage ADU Conversion
1. Concrete Slab Moisture Seal & Leveling
Garage slabs are uninsulated and absorb ground moisture. We apply self-leveling underlayment and high-grade moisture barriers to ensure your new interior flooring stays dry and level.
2. Garage Door Infill Framing
We remove the garage overhead door and build insulated wall framing featuring energy-efficient Low-E windows and a private residential entry door that matches your home’s exterior siding or stone. Doing this without permits is where most conversions come undone, and the permit risks of a DIY garage conversion in Texas sets out what an unpermitted infill costs you at resale.
3. Sub-Slab Plumbing & Sewer Tie-In
Our licensed plumbers saw-cut the concrete floor to lay drain lines for a full bathroom (shower, vanity, toilet) and kitchen sink, tying into the primary residential sewer main.
4. Insulation, Electrical & Mini-Split HVAC
We upgrade your electrical service to a 200-amp sub-panel, run dedicated circuits, pack wall cavities with high-density insulation, and install a ductless mini-split heat pump system.
5. Drywall, Luxury Flooring & Final City Inspection
We hang fire-rated 5/8-inch Type X drywall on shared walls, install waterproof luxury vinyl plank flooring, fit kitchen cabinetry, and secure city certificate of occupancy approval.
If you are still choosing between converting and building new, our garage conversion against detached ADU cost comparison puts the two side by side.
Conversion Warranties & Peace of Mind
- 5-Year Moisture Barrier & Slab Waterproofing Guarantee: Complete protection against concrete vapor transmission and flooring damage.
- 1-Year Workmanship Warranty: Guaranteed trade performance on all electrical, plumbing, HVAC, and carpentry installations.
Call our Georgetown garage conversion specialists today at (737) 240-4005 to schedule your free feasibility assessment.
Technical Specifications & Performance Standards
Materials & Tech
- • Self-levelling underlayment over a moisture barrier
- • Wall and ceiling insulation to the adopted energy code
- • Type X drywall on any wall shared with the main house
- • Ductless mini-split heating and cooling
- • Sewer tie-in routed around shallow rock where present
Performance Metrics
- • Full thermal envelope, so it stops behaving like a garage
- • Sound separation on walls shared with the primary dwelling
Code Standards
- • IRC 2021 habitable-space conversion requirements
- • Georgetown UDC parking provisions for converted garages
Service FAQs
What is the average cost to convert a 2-car garage into an ADU?
An average is not much use here, because the gap between a straightforward conversion and an awkward one is wider than any single figure suggests. Three things move it most: whether the existing slab and framing need structural upgrading, how far utilities have to be trenched to reach the main house connections, and the finish level you choose. All three are visible on site and none of them are visible on a price list, which is why we quote after a site assessment rather than before.
Do I have to replace the parking spaces lost in a garage conversion?
Under current local zoning guidelines, replacement off-street parking is generally not required when converting an existing garage into a compliant ADU.
Where We Build Garage Conversion ADU Remodeling
Each city sits on different ground, and that changes the foundation spec and the review path. Pick your city for local setbacks, soil and permitting detail.
- Cedar Park, TX Limestone Bedrock & Shallow Clay Soil
- Georgetown, TX Central Texas Expansive Black Clay (Vertisols)
- Leander, TX Hill Country Limestone & Gravelly Clay Loam
- Round Rock, TX Expansive Black Clay & Limestone Outcroppings
- Sun City, TX Expansive Black Clay Soil & Shallow Bedrock
Not listed? See every area we serve across Williamson County .
Speak to an ADU Engineer
Have technical questions about lot setbacks, clay soil post-tension foundations, or Georgetown UDC code compliance?
Call (737) 240-4005Mon - Sat: 7:00 AM - 7:00 PM