BUILDING ADUs IN LITTLETON
Littleton took proactive steps to embrace ADU construction, passing Ordinance No. 09 in 2025. The ordinance allows one ADU per lot in all single-family zones, with a maximum size of 1,000 square feet or the primary home's gross floor area — whichever is less. Most ADU projects in Littleton require only administrative approval, meaning no public hearing.
Littleton's established neighborhoods, mature trees, and walkable downtown make it one of the most desirable communities in the south metro. ADUs here serve homeowners looking for rental income, multigenerational living, and long-term property investment.
303 Construction understands Littleton's specific ADU regulations and has extensive experience building in the south metro area. We handle design, permitting, and construction under one contract.
TYPES OF ADUs IN LITTLETON
Littleton's older neighborhoods near downtown feature larger lots ideal for detached backyard ADUs. Many homes have full basements suitable for conversion. Garage conversions work well on properties with alley access. Maximum ADU size is 1,000 sq ft or primary home size, whichever is less.
VIEW ALL ADU TYPES IN DETAIL →THE ADU PERMIT PROCESS IN LITTLETON
Under Ordinance No. 09 (2025), Littleton allows ADUs in all single-family zones with administrative approval only — no public hearing required for most projects. 303 Construction handles the full permit process for Littleton ADU projects.
FULL PERMIT GUIDE →WHY 303 CONSTRUCTION FOR YOUR LITTLETON ADU
20+ years building across the Denver metro
We handle permits, design coordination, and construction under one contract
Free consultation — we assess your specific property first
Local crews, local knowledge, accountable to the community
Ready to Build an ADU in Littleton?
Start with a free consultation. We'll look at your property, confirm your eligibility under current zoning, and give you honest options. No pressure.