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CD - Accessory Dwelling Units (ADUs)

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1. How tall can an ADU be?

A detached ADU is allowed to be up to 25 feet tall (approximately 2 stories); this would allow for an ADU above a garage. If an attached/internal ADU is proposed, then the underlying height maximum applies, typically 35 feet in residential and agricultural zone districts. In addition, bulk plane applies in all R-series zone districts, which further limits the building envelope.

2. How big can an ADU be?

There is a maximum size limit of 50% of the gross floor area of the primary dwelling unit, or 1,000 square feet, whichever is more restrictive. The maximum building coverage for the zone district also applies to the entire property.

As an exception to this limit, an ADU in a basement or second floor may exceed the above allowance if the first floor is the same area. For example, an ADU in a basement may be up to 1,200 square feet if the first floor is 1,200 square feet. 

If an ADU is part of a detached garage, the ADU square footage is counted separately from the footprint of the garage. For example, a detached garage of 800 square feet can potentially have an 800 square foot ADU above, and the ADU is only considered to be 800 square feet, not 1,600 square feet. 

3. Can I sell my ADU?

No, an ADU cannot be sold separately or subdivided from the main house. This is prohibited by code and included in Section 3 of the required deed restriction.

4. Can I rent my ADU and the main house?

No, only one unit may be rented out. The owner of the property must occupy either the main house or the ADU (or both), and must sign a deed restriction stating they will comply with this code requirement prior to approval of the ADU. 

5. Can I add an ADU to an existing garage?

Yes, but the existing structure must meet zoning requirements including setbacks. An ADU can be placed above an existing garage as a second floor. Existing structures that do not meet all zoning requirements may potentially be converted into an ADU after a variance review process; variance approvals are not a guarantee, so please contact the Planner of the Day to discuss your situation. 

6. Can I convert a portion of my house (eg basement or second floor) to an ADU?

Maybe. ADUs internal to a home are allowed by the zoning code, but it is more challenging to create an ADU in this way because of building code requirements related to separate egress, fire separation, ceiling height, and mechanical codes.  

7. Can I use my ADU as a short-term rental (STR)?

Yes, but an ADU may only be used as a "partial home" rental, which means the owner of the property must continuously reside on site. More information on STRs can be found at the City's Licensing website. An STR license is required. 

8. Can I convert my RV to an ADU?

No, dwelling units may not have wheels. All homes -- primary or accessory -- are required to be constructed on permanent foundations.

9. Can I build a tiny home for an ADU?

Yes, the City of Wheat has adopted Appendix Q of the IRC which allows for and creates specific requirements for tiny homes. A tiny home must be placed on a foundation, and can be either an ADU or primary home.

10. I live in a duplex or attached townhome or condo, can I have an ADU?

No, a new ADU is not allowed on a property with duplex or multi-unit structures. A limited exception is if an existing ADU may currently be located on the property and if the ADU is determined by the Community Development Department to be legally nonconforming, then it may remain. When voluntarily removed, however, it cannot be rebuilt.

11. Will an ADU require separate utilities?

Potentially. Wheat Ridge is not a full-service city, so you will need to contact your individual water and sanitation districts for requirements, as they may vary by district. For example, some districts may require separate sanitation taps for detached ADUs. Xcel allows, but does not require, separate meters for ADUs.

12. Will an ADU require a separate address?

Yes. The address will be assigned as part of the staff review process. Per policy, the address of the ADU will be the main address followed by Unit B. For example, if the primary home is 1234 Merry Way, then the ADU would be 1234 Merry Way Unit B. 

City staff will complete an address notification to all utility providers, including emergency services and the post office. The address of the ADU will need to be very clearly posted on the property. 

13. I have an existing dwelling unit that may qualify as an ADU, what if it's too big or too tall or too close to the property line?

If staff determines the existing ADU is legally nonconforming through the existing ADU application process, then zoning requirements do not need to be met, and the ADU can achieve legal status. Current zoning requirements do not apply to existing ADUs.

14. I have an existing dwelling that may qualify as an ADU, why should I come to the City to get legal ADU status?

There are several reasons why.  First, for context, it should be noted that prior to August 15, 2022, ADUs were not permitted by Wheat Ridge City Code.  It is understood, however, that ADUs may exist in the community for one reason or another. For that reason, City Council approved a two-year grace period granting owners the right to apply to the City for approval of an ADU. For applications received PRIOR to August 15, 2024 there is increased flexibility.  After August 15, 2024 there will be reduced flexibility and/or penalties.

There are two likely paths for existing ADUs and specific reasons to seek legal approval now:

• If there is evidence that the ADU is legally nonconforming, no building permit will be required, and a CO will be issued for a legal ADU. If an ADU of this kind does not apply for legal ADU status before August 15, 2024, then building codes will apply after this date. This is a simple process allowing existing legally nonconforming ADUs to gain legal status without any required permits or fees.
• If there is no evidence of an ADU being legally nonconforming, this is often indicative that work may have been completed at some point without a building permit. A courtesy inspection will be required and a building permit will likely be required to ensure that life safety and separation between the units exist if attached.  If an ADU of this kind does not apply for legal ADU status before August 15, 2024, then these will be treated like illegal work; double permit fees will apply and the applicability of building codes may expand beyond life/safety considerations.

Other unique scenarios will have additional flexibility during grace period between now and August 15, 2024: 

• If there are multiple existing ADUs on a property, then it may be possible for them all to remain if legal status is obtained prior to August 15, 2024. 
• Regarding the owner occupancy requirement, the City acknowledges there may be some existing ADUs for which the property owner is not residing in the primary home or in the ADU. If owners submit an application to legalize the ADU prior to August 15, 2024, then it may be possible to approve a temporary waiver of the owner occupancy requirement; such waiver will not be offered after that date.

15. What if an existing living space can't meet building code to be an official ADU?

That's okay! You can still have a second kitchen within a home or extra living space, it just won't get a separate address or be considered an official ADU. This is one of the extra benefits of the new ADU ordinance; there's more flexibility in how you can design your home and living space. Previously, additional living spaces could not have second kitchens. This option may be a good approach for some people and could avoid complications with utility districts.

For example, if it’s not possible to convert a basement to an ADU because of applicable building codes, then it’s still possible to have a bedroom, bathroom, kitchen in the basement for family members or roommates. The space would just be treated as additional square footage for the primary home.

16. There are multiple existing ADUs on my property. Is this okay?

Multiple ADUs on a property determined to be legal may remain pursuant to the code, but when voluntarily removed, only one ADU can remain or be rebuilt.  The property owner will need to apply for legal status prior to August 15, 2024; after which time multiple ADUs will not be approvable.

17. Will I be notified if my neighbor is building an ADU?

No. An ADU is a permitted use in the code, and there is no public notice required. This is similar to how you are not notified if your neighbor is building an addition, new house, or detached garage.