Last updated: September 24, 2026
What affects the price
Building an ADU involves several moving parts that shape your total investment. The final figure depends heavily on whether you choose a prefab unit or a custom build from the ground up. Site conditions are another major factor; if your property requires extensive grading, utility trenching, or foundation work, costs will climb. You also have to consider your choice of finishes, like high-end appliances or custom cabinetry. Navigating local permit fees and impact assessments also adds to the total.
About this service
A contractor oversees the physical build, managing the subcontractors, materials, and daily construction progress. They are responsible for making sure the structure is built according to the approved plans and local safety standards. You need a contractor when you have your designs finalized and are ready for the actual building phase to begin. They act as the primary point of contact for all site activity.
Frequently asked in Lewisville
What makes an ADU project an 'emergency' in Lewisville?
Can I get a detached accessory dwelling unit built in Lewisville?
How much does it cost to build an accessory dwelling unit in Lewisville?
What are the options for ADU housing in Lewisville?
Are there any ADU permit cost considerations in Lewisville?
What is involved in ADU construction in Lewisville?
How do I find the best ADU for my property in Lewisville?
Also serving nearby: Carrollton · Frisco · Plano · Irving · Denton
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Lewisville — population 133,553; about 3,284 residents per square mile across 40.7 sq mi. ZIP codes covered include 75029, 75057, 75067, 75077.
Neighborhoods served in Lewisville: Old Town Lewisville, Lakewood Village, Vista Ridge, Castle Hills, Rose Meadow — and every surrounding area.
Areas we serve
Browse by state, then city.
