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Littleton has some of the strongest ADU fundamentals in the south Denver metro — generous lots, light rail access, and high rental demand. Here’s how to evaluate your property.
| ADUs Allowed? | ✅ Yes — subject jurisdiction under HB 24-1152 |
| Maximum Size | 1,000 sq ft or 50% of primary home area |
| ADU Types Permitted | Detached, attached, basement, garage conversion |
| Owner-Occupancy Required? | Not required under HB 24-1152 |
| Parking Requirement | 1 space per ADU; may be waived near Littleton light rail stations |
| HOA Override? | HOAs cannot prohibit ADUs per HB 24-1152 |
| Short-Term Rental (STR)? | Littleton STR rules apply; city has an active short-term rental ordinance |
| Permit Path | Administrative approval through Littleton Community Development |
| Estimated Permit Timeline | 8–14 weeks |
| Official Source | City of Littleton Community Development |
⟳ Last reviewed: October 2026. ADU rules change. Always verify current code with Littleton before starting a project. View official source →
Littleton’s walkable historic downtown, strong school district, and established neighborhoods make it one of the more desirable ADU markets in the south metro. The city is compact — just 14 square miles — with a mix of older homes near downtown and newer developments further out. Proximity to the Southwest light rail line creates parking waiver eligibility in many neighborhoods. Littleton has an active STR ordinance, so if you plan to rent your ADU short-term, verify compliance carefully.
Not sure if your lot qualifies? The ADU quiz takes 3 minutes and gives you a personalized eligibility summary based on your property type, location, and goals. Take the free ADU quiz →
| Detached Backyard Cottage | $210,000–$385,000 |
| Garage Conversion | $55,000–$140,000 |
| Basement ADU Conversion | $42,000–$115,000 |
| Permit Fees (estimate) | $3,200–$9,500 |
| Utility Tap Fees (detached) | $5,500–$15,000 (Littleton/Englewood Wastewater Treatment; water varies by provider) |
| Estimated Monthly Rent | $1,750–$2,850/month |
| Estimated Break-Even | 7–11 years for detached; 3–5 years for conversion |
Local note: Properties within ½ mile of Littleton light rail stations may qualify for parking waivers, saving $5,000–$15,000 in site work. Littleton’s walkability and school district quality keep rental vacancy rates low.
Cost ranges reflect 2026 Denver metro construction pricing. Individual project costs depend on site conditions, finishes, utility distances, and contractor selection. Get multiple bids before committing to a budget.
Official Sources
Rules and fees change. Always verify current requirements directly with your local jurisdiction and utility provider before starting a project.
Answer 7 questions to see your estimated cost range, likely ADU type, and local eligibility — free, no sign-up required.