Affordable adu — Boulder, CO
Last updated: September 24, 2026
What affects the price
Building an ADU involves variables that shift your total investment. The footprint size and complexity of the architectural design are primary factors. Are you planning a detached unit that requires new utility trenching, or is this a garage conversion that uses existing plumbing? Site accessibility, soil conditions, and your choice of finishes—like luxury flooring versus standard options—also play significant roles. Permitting fees vary widely depending on your local municipality and current zoning requirements. Exact pricing confirmed free on the call.
About this service
Creating an affordable ADU means balancing design preferences with construction realities. By choosing a pre-designed model or focusing on a straightforward layout, you can significantly reduce material waste and labor hours. We work with you to prioritize the features that matter most to keep your project efficient. Exact pricing confirmed free on the call.
Frequently asked in Boulder
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What are accessory dwelling units (ADUs)?
Accessory dwelling units (ADUs) are secondary, independent living spaces on a single-family home lot. They can be attached to the main house or be a separate structure, like a backyard cottage. ADUs typically include their own kitchen, bathroom, and sleeping areas, offering flexible housing solutions for homeowners and renters. Boulder has specific regulations for these units.
Also serving nearby: Longmont · Westminster · Arvada · Thornton · Lakewood
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Boulder — population 105,898; about 3,937 residents per square mile across 26.9 sq mi. ZIP codes covered include 80301, 80302, 80303, 80304, 80305, 80306, 80307, 80308.
Neighborhoods served in Boulder: Pearl Street, Newlands, Mapleton Hill, Whittier, Downtown Boulder — and every surrounding area.
Areas we serve
Browse by state, then city.