How Littleton Handles Accessory Structures: A Practical Guide

Littleton maintains 39 local ordinances across all categories, and 3 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where Littleton falls on the strict-to-permissive spectrum compared to other cities.

Garage Conversions

Garage conversions in Littleton require building permits under Title 4 and must comply with ULUC parking requirements. Converting a garage to living space may create a parking deficiency if the property's required off-street parking is reduced below the minimum.

Key details: Permit: Required. Parking: Must maintain minimums. ADU Conversion: No extra parking needed. Code: Title 4; Title 10 ULUC.

Unpermitted garage conversion: stop-work order and code violation. Occupancy without certificate: enforcement action. Parking deficiency: zoning violation.

ADU Rules

Littleton passed Ordinance No. 09, Series 2025, allowing ADUs in all residential zones to comply with Colorado HB 24-1152. The ordinance increases maximum ADU size to 1,000 sq ft, eliminates extra parking requirements, and removes design restrictions that don't apply to primary homes. Effective June 2025.

Key details: Max Size: 1,000 sq ft. Parking: No additional required. Owner Occupancy: Not required. Ordinance: No. 09, Series 2025.

ADU without permit: stop-work order and mandatory permitting. Non-compliant ADU: correction to meet ULUC standards.

Shed Rules

Littleton's building code (Title 4) and ULUC (Title 10) regulate accessory structures. Structures under 200 sq ft may be exempt from building permits in some cases, but must still comply with ULUC zoning setbacks and lot coverage. Larger structures require permits.

Key details: Permit Exempt: Under 200 sq ft (conditions). Over 200 sq ft: Permit required. Snow Load: 30 psf minimum. Code: Title 4; Title 10 ULUC.

Unpermitted accessory structure: stop-work order and mandatory permit. Setback violations: relocation or removal may be required.

The Bottom Line

Littleton's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Littleton is broadly strict or permissive.

These rules come from Littleton's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.