Cost of accessory dwelling unit — Richardson, TX
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
Building an ADU involves several variables that shift the total investment. Your site conditions, the type of foundation, and the quality of finishes you choose will dictate whether you land on the lower or higher end of the spectrum. Because every lot is unique, we provide a breakdown of your specific project requirements to ensure full transparency. Exact pricing confirmed free on the call.
Frequently asked in Richardson
What are the benefits of an accessory dwelling unit in Richardson?
Can I build a detached accessory dwelling unit in Richardson?
Where can I find accessory dwelling unit builders near me in Richardson?
What is the accessory dwelling unit construction process in Richardson?
What are accessory dwelling unit financing options in Richardson?
What are accessory dwelling unit companies in Richardson?
What is the accessory dwelling unit permit process in Richardson?
Also serving nearby: Plano · Garland · Allen · Carrollton · Dallas
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Richardson — population 117,435; about 4,111 residents per square mile across 28.6 sq mi. ZIP codes covered include 75080, 75081, 75082, 75083, 75085.
Neighborhoods served in Richardson: Telecom Corridor, Old Town Richardson, Heights of Richardson, Northrich, Breckenridge — and every surrounding area.
Areas we serve
Browse by state, then city.