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Market Stats
Information

Boulder, CO ADU Homes for Sale

Home
Boulder, CO Adu Homes For Sale

ADU homes for sale in Boulder, Colorado, updated daily from the MLS. Every listing below matches this search in Boulder; scroll past the homes for what they cost, what to check before you write an offer, and the same search in every other Colorado city.

Call or text 303-955-4220. A live person answers.

23 Properties Found
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Boulder, CO ADU Market Statistics

23
Homes Listed
76
Avg. Days on Site
$735
Avg. $ / Sq.Ft.
$2,560,178
Med. List Price

Homes With an ADU for Sale in Boulder, CO: What You Are Looking At

An ADU in Boulder is an accessory dwelling unit: a second, smaller home on the same lot, with its own kitchen, bathroom and entrance. It is a detached casita in the backyard, an apartment over the garage, or a basement apartment with a separate door. Buyers searching ADU homes for sale in Boulder also search casitas, carriage houses, garage apartments, mother-in-law suites and homes with rental income, and this page pulls all of them from the MLS. As of September 28, 2026 this page shows 23 homes with an ADU for sale in Boulder with a median list price of $2,561,265 and an average of $735 per square foot.

The Kenna Real Estate Group has sold Colorado homes since 2002 and shows ADU homes 7 days a week, and same day when the seller allows it. Call or text 303-955-4220. A live person answers.

What an ADU Does for a Boulder Buyer

  • Parents or adult sons and daughters next door, not down the hall. Full privacy on one property.
  • Rental income. A legal long-term rental in the ADU helps pay the mortgage on the main house. Short-term rental rules are set by the city and the HOA, so check them before you count on nightly income.
  • A home office, studio or guest house that does not eat a bedroom in the main home.
  • Resale. A permitted ADU is one of the few improvements in Boulder that adds more value than it costs, because two households can pay for one property.

Colorado's ADU Rules in Boulder

Colorado's 2024 ADU law (House Bill 24-1152) requires the larger Front Range cities and counties to allow one accessory dwelling unit on most single-family lots starting in mid-2025, and each city sets its own size, height, parking and owner-occupancy rules on top of that. Read the Colorado ADU rules for 2026 before you buy a lot to build on, and confirm the Boulder zoning for the exact address with a Kenna agent. An existing ADU still needs a permit and a certificate of occupancy to count as legal; ask for both.

What to Check Before You Buy an ADU Home in Boulder

  1. Permits and the certificate of occupancy. An unpermitted unit is a negotiating point for you and a disclosure problem later. A Kenna agent pulls the permit history during your review period.
  2. Separate entrance, kitchen and bath. That is what makes it a dwelling unit and not a finished basement.
  3. Utilities and address. A separate meter and a unit number make renting simple; a shared meter means a lease that splits the bill.
  4. HOA covenants. Covenants still control design, parking and rental terms. Read them before you offer.
  5. Financing. Conventional, FHA and VA loans all buy a home with an ADU, and some lenders count part of the ADU's rent toward your qualifying income. Ask before you shop.

Selling a Boulder Home With an ADU?

Buyers pay for a permitted, rentable unit and pay nothing extra for an illegal one. A free Smart Pricing Report prices the main house and the ADU from Boulder homes that actually sold, with three prices and the time frame for each. Call or text 303-955-4220.

ADU Homes Near Boulder

Boulder ADU Questions

What counts as an ADU in Boulder?

A separate living unit on the same lot with its own kitchen, bathroom, sleeping area and entrance, permitted by the city. A casita, a garage apartment and a walkout basement apartment all qualify when they are permitted.

Can I rent out the ADU?

Long-term rentals are allowed in most of the cities covered by the state law. Short-term rentals depend on the Boulder ordinance and the HOA. A Kenna agent checks both for the exact address before you offer.

Can I add an ADU to a Boulder home I buy?

On most single-family lots in the covered cities, yes, within the local size and setback rules. Buying the right lot is the whole game: alley access, a flat backyard and an existing detached garage cut the cost.

Can I see a Boulder ADU home today?

Yes. Showings run 7 days a week and same-day when the seller allows. Call or text 303-955-4220. A live person answers.

More for Boulder ADU Buyers

Kenna Real Estate Group at Keller Williams DTC · 6300 S Syracuse Way, Suite 150, Centennial · Call or text 303-955-4220. A live person answers, 7 days a week.

ADU for sale across Colorado

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Want a tour or a price opinion on any home above? Call or text 303-955-4220. A live person answers. Not a robot, not a phone tree.
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