The new Colorado state laws for Accessory Dwelling Units (ADUs) are primarily defined by HB24-1152, which significantly changes how these units are regulated across the state.
Key highlights of the new regulations include:
- Mandatory Allowance: The law requires most municipalities to allow attached, detached, and internal ADUs "by right" in residential zones. This ensures that local governments cannot outright prohibit the construction of ADUs.
- Implementation Timeline: Historically larger cities must comply by 2025, while all remaining jurisdictions must meet these mandates by 2026.
- Local Authority: While cities cannot ban ADUs, they still maintain control over local development codes. This includes regulations regarding setbacks, height limits, lot coverage, and parking requirements.
- Relaxed Restrictions: The new state mandates generally aim to relax previous barriers, such as reducing minimum lot size requirements and easing owner-occupancy restrictions in many areas.
- Building Requirements: Even with state-level changes, all ADUs must meet safety and habitability standards. For example, legal ADUs typically require a minimum ceiling height of 7.5 feet for habitable rooms and must meet ICC code for egress windows (minimum 5.7 sq. ft. opening) to ensure life safety.
Related FAQs
-
What is the Colorado Model Low Energy and Carbon Code?
Read More »: What is the Colorado Model Low Energy and Carbon Code?The Model Low Energy and Carbon Code (MLECC) is an enhanced energy standard in Colorado designed to push building efficiency beyond baseline requirements. It serves as a framework for low-energy and low-carbon construction in both new homes and major renovation…
-
Does my Home Remodel in Denver Need to Comply with the 2026 Mlecc?
Read More »: Does my Home Remodel in Denver Need to Comply with the 2026 Mlecc?Yes, if you are planning a major renovation or remodel in Denver, your project will need to comply with the Model Low Energy and Carbon Code (MLECC). Denver has adopted the MLECC with a timeline that makes these standards mandatory…
-
What are the Insulation and Air Sealing Standards in the New Colorado Energy Code?
Read More »: What are the Insulation and Air Sealing Standards in the New Colorado Energy Code?The New Colorado Model Low Energy and Carbon Code (MLECC) establishes rigorous performance benchmarks for building envelopes, focusing on high-performance insulation and enhanced air sealing to move homes toward net-zero energy readiness. Insulation Standards Insulation requirements vary by jurisdiction, with…
-
How does the Mlecc Affect Residential Window Requirements after July 1, 2026?
Read More »: How does the Mlecc Affect Residential Window Requirements after July 1, 2026?Starting July 1, 2026, the Model Low Energy and Carbon Code (MLECC) significantly tightens window performance standards for residential projects across most Colorado jurisdictions. These updates focus on specific efficiency metrics to reduce carbon emissions and heat transfer. Key requirements…
-
What is the Average Siding Installation Cost per Square Foot in Denver for 2026?
Read More »: What is the Average Siding Installation Cost per Square Foot in Denver for 2026?The average siding installation cost per square foot in Denver for 2026 typically ranges per square foot. Because every home has unique architectural features and site conditions, this range serves as a rough guideline, and a custom on-site quote is…
