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Denver zoning codes in 2026: the short answer
A Denver zone district name tells you what you can build. The first letter is the neighborhood context (S suburban, E urban edge, U urban, G general urban, C urban center), the middle letters are the building types allowed (SU single unit, TU two unit, RH row house, MU multi unit, MX mixed use), and the last letter or number sets the minimum lot or the height (U-SU-C = 5,500 sq ft lot, U-MX-3 = 3 stories). The biggest change for investors: since December 16, 2024, Denver allows an accessory dwelling unit (ADU) in all residential areas, about 70% of the city's land, up from 36%. Updated Oct 25, 2026.
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| Zone code | Minimum lot | What you can build |
|---|---|---|
| U-SU-A / E-SU-A | 3,000 sq ft | One house, plus an ADU |
| U-SU-B / E-SU-B | 4,500 sq ft | One house, plus an ADU |
| U-SU-C / E-SU-C | 5,500 sq ft | One house, plus an ADU |
| E-SU-D | 6,000 sq ft | One house, plus an ADU |
| U-TU-B | 4,500 sq ft | A duplex or two homes on one lot |
| U-TU-C | 5,500 sq ft | A duplex or two homes on one lot |
| U-RH-2.5 | Varies | Row houses, up to 2.5 stories |
| U-MX-3 | Varies | Shops, offices and homes, including townhomes and apartments, up to 3 stories |
What changed for ADUs: before December 16, 2024, the "1" at the end of a single-unit code (U-SU-A1, E-SU-D1) marked the lots where an ADU was allowed. Now ADUs are allowed in all residential areas, an HOA rule that bans ADUs no longer applies (Colorado HB24-1152), and the ADU can stay in use if the owner later moves off the property (City of Denver, Citywide ADUs). Look up any address on the Denver zoning map; some parcels still carry Former Chapter 59 zoning (for example a PUD), which follows its own rules.
For sale today (Oct 25, 2026): 111 Denver listings mention an ADU in the MLS text (Denver homes with an ADU) and 202 are duplexes (Denver duplexes for sale). More: Denver ADU costs and permits and Denver income properties.
We are real estate agents, not land-use attorneys or engineers. Confirm the zoning and any building plan with Denver Community Planning and Development before you buy.
Call or text 303-955-4220. A live person answers.
Before diving into the Denver zoning codes essential for home investors, it's crucial to emphasize the importance of conducting thorough due diligence when purchasing a property. This guide will provide an overview of popular Denver zoning codes to help you make informed decisions. Remember that zoning regulations can change, so always verify the latest information from official sources. Contact Kenna Real Estate Group with any questions, 303-955-4220
Explore some of the zoning codes investors in homes should be aware of:
E-SU-DX (Single Unit - Detached Residential with Extra Flexibility)
- Property Type: Single unit (can be used for living or rented to one party).
- Minimum Lot Size: 6,000 square feet.
- Description: E-SU-DX zoning permits suburban-style houses, which often feature increased height at the rear of the property. This zoning may also accommodate group living arrangements and non-residential developments.
Ready to find your dream home in Colorado?
Let us help you. Call or Text Kenna Real Estate Group at 303-955-4220 to get personalized assistance from our expert real estate agents. Find out what your home is worth in today's market.
E-SU-D1 (Single Unit - Detached Residential with Accessory Dwelling Units)
- Property Type: Single unit (can be used for living or rented to one party).
- Minimum Lot Size: 6,000 square feet.
- Description: E-SU-D1 zoning allows accessory dwelling units, often called cottages, in the backyard, providing additional rental opportunities or guest housing.
U-SU-A (Single Unit - Detached Residential)
- Property Type: Single unit (can be used for living or rented to one party).
- Minimum Lot Size: 3,000 square feet.
- Description: U-SU-A zoning applies to single-unit detached residential properties with a minimum lot size requirement.
U-SU-A1 (Single Unit - Detached Residential with Accessory Dwelling Units)
- Property Type: Single unit (can be used for living or rented to one party).
- Minimum Lot Size: 3,000 square feet.
- Description: U-SU-A1 zoning permits accessory dwelling units, offering the opportunity to add cottages or secondary units.
U-SU-B1 (Single Unit - Detached Residential with Accessory Dwelling Units)
- Property Type: Single unit (can be used for living or rented to one party).
- Minimum Lot Size: 4,500 square feet.
- Description: U-SU-B1 zoning, like U-SU-A1, allows accessory dwelling units, providing additional rental income or space for guests.
Ready to find your dream home in Colorado?
Let us help you. Call or Text Kenna Real Estate Group at 303-955-4220 to get personalized assistance from our expert real estate agents. Find out what your home is worth in today's market.
U-SU-B (Single Unit - Detached Residential)
- Property Type: Single unit (can be used for living or rented to one party).
- Minimum Lot Size: 4,500 square feet.
- Description: U-SU-B zoning applies to single-unit detached residential properties with a minimum lot size requirement.
U-SU-C (Single Unit - Detached Residential)
- Property Type: Single unit (can be used for living or rented to one party).
- Minimum Lot Size: 5,500 square feet.
- Description: U-SU-C zoning is designated for single-unit detached residential properties with a larger minimum lot size.
U-TU-B (Two Unit - Detached Residential)
- Property Type: Two units (can be used for living or rented to two different parties).
- Minimum Lot Size: 4,500 square feet.
- Description: U-TU-B zoning allows for two residential units on the property, catering to multiple tenants or owners.
Ready to find your dream home in Colorado?
Let us help you. Call or Text Kenna Real Estate Group at 303-955-4220 to get personalized assistance from our expert real estate agents. Find out what your home is worth in today's market.
U-TU-B2 (Two Unit - Detached Residential with Row House Option)
- Property Type: Two units (can be used for living or rented to two different parties).
- Minimum Lot Size: 4,500 square feet.
- Description: U-TU-B2 zoning permits two residential units and may allow for row houses, especially on corner lots.
U-TU-C (Two Unit - Detached Residential)
- Property Type: Two units (can be used for living or rented to two different parties).
- Minimum Lot Size: 5,500 square feet.
- Description: U-TU-C zoning applies to properties with two residential units and a larger minimum lot size.
U-MX-3 (Urban Mixed-Use with Max Height of 3 Stories)
- Property Type: Urban mixed-use (shops, offices and homes; townhomes allowed).
- Description: U-MX-3 zoning is ideal for urban developments with a maximum height limit of three stories. This zoning allows for commercial use and the construction of townhomes.
RES (Residential Zoning)
- Description: The term "RES" indicates outdated zoning code, and it's crucial to consult current regulations for accurate information.
Ready to find your dream home in Colorado?
Let us help you. Call or Text Kenna Real Estate Group at 303-955-4220 to get personalized assistance from our expert real estate agents. Find out what your home is worth in today's market.
SFR (Single Family Residential)
- Description: "SFR" denotes outdated zoning code, and verifying the latest zoning regulations is essential to ensure compliance.
Remember that zoning codes can change, so consult with local authorities or a real estate professional to stay up-to-date with the latest regulations. If you're seeking guidance or assistance in navigating Denver's real estate market, whether as a buyer, seller, or investor, don't hesitate to contact a knowledgeable real estate agent who can provide valuable support. We're here to help you make informed decisions and find the perfect investment opportunity.
