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Originally Posted by bunt_q
They are outlawed in the vast majority of Denver’s single family zone districts, which are the majority of urban land here, even in central Denver, and also happen to be where ADUs are most likely to be built. Let’s not pretend Denver is even remotely leading on this front. YIMBY Denver has considered tackling ADUs as a flagship issue. But so far the City seems to have good momentum through Blueprint Denver, so we are in a holding pattern until plan adoption in June. If the City stalls in implementing the expected pro-ADU plan recommendations with actual ADU-friendly zoning, we will of course reconsider the need for more of a push.
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I was specifically thinking of the area bounded by Federal, Colorado, Alameda and I70. After Scrolling around the map, I agree there is a lot of SU-A, SU-B, SU-C, SU-D and SU-G covering much of Alamo Placita, Country Club, and Congress park that should be changed to SU-A1 ou SU-A2, SU-B1 or B2, etc.
North of that, Cole, Clayton, Whittier, Skyline, and City Park West are all SU-A1, SU-B1 or SU-D1X with the acception of right by the golf course. I think all U-SU and E-SU designations that include a number in their district designation allow ADUs to some extent. Almost everything else in the area I described is already zoned for multiple units including all of lincoln park even thought most is built out with SFUs. Whether you can fit an ADU into the build envelope is another issue that needs to be addressed. Currently on my 25' wide U-RH-2.5 lot the upstairs would be limited to 9' wide due to the shortened envelope in the back of the lot.
Here are the U-SU districts that specifically allow ADUs and I think the E-SU districts are similar.
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5.2.2.2 Specific Intent
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B. Single Unit A1 (U-SU-A1)
U-SU-A1 is a single unit district allowing urban houses and detached accessory dwelling units with a minimum zone lot area of 3,000 square feet. Blocks typically have a pattern of 25 foot wide lots. This district requires the shallowest setbacks and allows the highest lot coverage in the Urban Neighborhood Context. Setbacks and lot coverage standards accommodate front and side yards similar to U-SU-A but allowing a detached accessory dwelling unit building form in the rear yard.
C. Single Unit A2 (U-SU-A2)
U-SU-A2 is a single unit district allowing urban houses with a minimum zone lot area of 3,000 square feet. Detached accessory dwelling units, duplexes and tandem houses are also allowed on certain corner lots only. Blocks typically have a pattern of 25 foot wide lots. Setbacks and lot coverage standards accommodate front and side yards similar to U-SU-A.
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E. Single Unit B1 (U-SU-B1)
U-SU-B1 is a single unit district allowing urban houses and detached accessory dwelling units with a minimum zone lot area of 4,500 square feet. Blocks typically have a pattern of 37.5 foot wide lots. Setbacks and lot coverage standards accommodate front and side yards similar to U-SU-B but allowing a detached accessory dwelling unit building form in the rear yard.
F. Single Unit B2 (U-SU-B2)
U-SU-B2 is a single unit district allowing urban houses with a minimum zone lot area of 4,500 square feet. Detached accessory dwelling units, duplexes and tandem houses are also allowed on certain corner lots. Blocks typically have a pattern of 37.5 foot wide lots. Setbacks and lot coverage standards accommodate front and side yards similar to U-SU-B.
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H. Single Unit C1 (U-SU-C1)
U-SU-C1 is a single unit district allowing urban houses and detached accessory dwelling units with a minimum zone lot area of 5,500 square feet. Blocks typically have a consistent pattern of 50 foot wide lots. Setbacks and lot coverage standards accommodate front and side yards similar to U-SU-C but allowing a detached accessory dwelling unit building form in the rear yard.
I. Single Unit C2 (U-SU-C2)
U-SU-C2 is a single unit district allowing urban houses with a minimum zone lot area of 5,500 square feet. Detached accessory dwelling units, duplexes and tandem houses are also allowed on certain corner lots. Blocks typically have a consistent pattern of 50 foot wide lots. Setbacks and lot coverage standards accommodate front and side yards similar to U-SU-C.
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K. Single Unit E1 (U-SU-E1)
U-SU-E1 is a single unit district allowing urban houses and detached accessory dwelling units with a minimum zone lot area of 7,000 square feet. Setbacks and lot coverage standards accommodate front and side yards similar to U-SU-E but allowing a detached accessory dwelling unit building form in the rear yard.
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M. Single Unit H1 (U-SU-H1)
U-SU-H1 is a single unit district allowing urban houses and detached accessory dwelling units with a minimum zone lot area of 10,000 square feet. Setbacks and building coverage standards accommodate front and side yards similar to U-SU-H but allowing a detached accessory dwelling unit building form in the rear yard.
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We just need to slip some numbers into the zoning designations of the first neighborhoods I mentioned

plus Park Hill, Belcaro, Wash Park, Wash Park West, Athmar park, Valverde, Sloans Lake, and West Highland. Large parts of Berkeley and Sunny Side are also already ADU Friendly.
I agree Denver can do much more to increase ADU construction but they are far from outlawed.
I will have to dig back in the wayback machine and look for the articles I read about the push to expand the districts that support ADUs and loosen some of the requirements for setbacks and other restrictions. I'm sure you have a much better handled on the city's commitment to this then I.