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Market Stats
Information

Castle Rock, CO ADU Homes for Sale

Home
Castle Rock, CO Adu Homes For Sale

Looking for ADU homes in Castle Rock? The grid below lists every match live from the MLS, and the market stats under it show today's median price and price per square foot. The listings run from Castlewood Ranch and Crystal Valley Ranch out to Macanta. Call or text 303-955-4220. A live person answers.

6 Properties Found
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Castle Rock, CO ADU Market Statistics

6
Homes Listed
73
Avg. Days on Site
$528
Avg. $ / Sq.Ft.
$1,461,650
Med. List Price

About ADU homes in Castle Rock

An ADU in Castle Rock 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 Castle Rock 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. This page shows homes with an ADU for sale in Castle Rock, and the count updates the moment a home lists or closes.

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.

Resale. A permitted ADU is one of the few improvements in Castle Rock that adds more value than it costs, because two households can pay for one property.

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.

Utilities and address. A separate meter and a unit number make renting simple; a shared meter means a lease that splits the bill.

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.

Questions people ask about ADU homes in Castle Rock

How many ADU homes are for sale in Castle Rock right now?

The grid at the top of this page is the live MLS list: it updates the moment a home lists or closes, and the market stats under it show today's median price.

Do ADU homes in Castle Rock have HOA fees?

Some do. Each listing card shows the HOA fee, and the grid filters can narrow the list to homes with no HOA. More: HOA fees in Colorado, explained.

What is the median price of ADU homes in Castle Rock?

The market stats under the grid show today's median list price and price per square foot, and they update with every new listing. More: Can I afford a home now?.

What does the median ADU homes in Castle Rock cost per month?

It depends on the price, your down payment and today's rate. Put the price of the home you like into the Colorado mortgage calculator at kennarealestate.com/colorado-mortgage-calculator for the full monthly cost. More: Can I afford a home now?.

What should I check before making an offer on ADU homes in Castle Rock?

The price per square foot against the other listings on this page (the market stats under the grid show today's median), the days on market, the HOA or metro district if there is one, the sewer line and roof age on older homes, and whether the seller pays a closing-cost credit or a rate buydown. More: Seller concessions for Colorado buyers.

Can I buy ADU home in Castle Rock with a low down payment?

Yes. Colorado down-payment assistance works at a 620 credit score, FHA takes 3.5 percent down, VA zero where the buyer qualifies, and a seller credit covers closing costs. On the median $825K ADU homes that is $28,875 down at 3.5 percent. More: Can I afford a home now?.

What counts as an ADU in Castle Rock?

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 Castle Rock ordinance and the HOA. A Kenna agent checks both for the exact address before you offer. More: Rent Out Your Home Instead of Selling in Today's Market – Kenna Real Estate Group Can Help -.

Can I rent out the ADU on a home in Castle Rock?

Yes. Long-term rental of the ADU is the common plan. Denver dropped its owner-occupancy rule in the 2024 zoning update, and other Front Range cities have followed. Nightly rental is a separate matter: cities that allow it tie it to your primary residence and require a license. Before you write an offer, ask the seller for the ADU permit and the city's current rental rules for that address. More: Rent Out Your Home Instead of Selling in Today's Market – Kenna Real Estate Group Can Help -.

Is the ADU legal and permitted?

Check this first. A permitted ADU has a building permit and a final inspection on file with the city. An unpermitted basement apartment or garage conversion can be ordered removed, cannot be counted by an appraiser and can void insurance coverage. Ask the listing agent for the permit number. We pull the city record for you before you tour.

How big can an ADU be?

Denver caps a detached ADU at 1,000 square feet and 24 feet tall, placed in the rear 35 percent of the lot. Other cities set their own numbers, so confirm the limits for the specific lot before you plan an expansion. Our guide to Colorado ADU regulations lists the rules by city.

Will the ADU raise my property tax?

Yes. A permitted ADU adds assessed value. Colorado reassesses every two years in odd years, so the added value shows up at the next reassessment and not the day you close. More: Colorado Property Tax Deductions: What to Know Before Filing.

New listings the day they hit

Text CASTLE ROCK and what you are looking for to 303-955-4220. A live person answers, sets up the saved search and sends the disclosures on any ADU homes you want to see.

Call or text 303-955-4220 All Castle Rock homes for sale

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

An ADU in Castle Rock 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 Castle Rock 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. This page shows homes with an ADU for sale in Castle Rock, and the count updates the moment a home lists or closes.

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 Castle Rock 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 Castle Rock that adds more value than it costs, because two households can pay for one property.

Colorado's ADU Rules in Castle Rock

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. Castle Rock sits in Douglas County, which has its own ADU regulations; read the Douglas County ADU rules for 2026 before you buy a lot to build on. 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 Castle Rock

  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 Castle Rock 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 Castle Rock homes that actually sold, with three prices and the time frame for each. Call or text 303-955-4220.

ADU Homes Near Castle Rock

Castle Rock ADU Questions

What counts as an ADU in Castle Rock?

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 Castle Rock ordinance and the HOA. A Kenna agent checks both for the exact address before you offer.

Can I add an ADU to a Castle Rock 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 Castle Rock 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 Castle Rock 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

More searches in Castle Rock

Guides for this market

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.

Questions Buyers Ask About ADU Homes in Castle Rock, Answered

Can I rent out the ADU on a home in Castle Rock?

Yes. Long-term rental of the ADU is the common plan. Denver dropped its owner-occupancy rule in the 2024 zoning update, and other Front Range cities have followed. Nightly rental is a separate matter: cities that allow it tie it to your primary residence and require a license. Before you write an offer, ask the seller for the ADU permit and the city's current rental rules for that address.

Is the ADU legal and permitted?

Check this first. A permitted ADU has a building permit and a final inspection on file with the city. An unpermitted basement apartment or garage conversion can be ordered removed, cannot be counted by an appraiser and can void insurance coverage. Ask the listing agent for the permit number. We pull the city record for you before you tour.

How big can an ADU be?

Denver caps a detached ADU at 1,000 square feet and 24 feet tall, placed in the rear 35 percent of the lot. Other cities set their own numbers, so confirm the limits for the specific lot before you plan an expansion. Our guide to Colorado ADU regulations lists the rules by city.

Will the ADU raise my property tax?

Yes. A permitted ADU adds assessed value. Colorado reassesses every two years in odd years, so the added value shows up at the next reassessment and not the day you close.

Can I finance a home with an ADU?

Yes. A conventional or FHA loan covers a home with an attached or detached ADU. Some lenders count projected rent from the ADU as qualifying income. Ask your lender for their ADU rental-income rule before you shop.

What do I inspect on an ADU?

Separate meters, a working heat source, egress windows, smoke and carbon monoxide alarms, a private entrance and water heater capacity. Ask for utility bills for the last 12 months so you see the real cost.

Want a tour of ADU homes in Castle Rock? Call or text 303-955-4220. A live person answers. The Kenna Real Estate Group sets up a search for you the same day and sends new matches the hour they list.

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