How much does adu construction cost in Denver, CO?

Most Denver homeowners spend between $163,500 – $327,000 on adu construction, with an average around $245,300. Local labor prices 9% above the national average, so Denver quotes tend to land at the higher end of national ranges.

Why is adu construction more or less expensive in Denver than elsewhere?

Denver labor runs about 10% above the national average and books out in summer. Hail is the top driver of roof replacement; freeze-thaw affects concrete.

Do I need a permit for adu construction in Denver, Colorado?

Denver permits required for roofing, structural, electrical and fences. Always confirm current requirements with the local building department before signing a contract, and make sure the permit is pulled by your licensed contractor.

How many quotes should I get in Denver?

Get at least three written quotes from licensed, insured Colorado contractors. Comparing line items — not just the bottom line — is the fastest way to spot an inflated bid in the Denver market.

How much does adu construction cost in 2026?

Most homeowners pay between $150,000 and $300,000, with a national average near $225,000. Small, simple jobs land at the low end; large or premium-material jobs run well above the high end.

What is the cost per square foot?

Installed pricing usually runs $250.00 to $500.00 per square foot, including labor and materials. Expensive metros can run 15–45% higher than that range.

What drives the price up the most?

Scope and access. Larger quantities lower your per-square foot price, but difficult access, demolition of existing work, structural repairs found mid-job, premium materials and rush scheduling each add 8–30%.

Permits are typically required when the work changes structure or ties into electrical, plumbing, gas or mechanical systems. Budget $75–$600 in most cities and confirm whether your contractor pulls it — unpermitted work can block a future home sale.

How long does the job take?

Most residential projects of this type finish in one to five working days once materials are on site. Custom orders, inspections and weather are the usual causes of delay.

How many quotes should I get?

Three. Bids on the same scope commonly vary 20–40%, and the middle bid with the strongest warranty and references is usually the best value — the cheapest bid often excludes prep, disposal or permits.

Home/Cost guides/ADU Construction/Denver, CO

Denver · Colorado

ADU Construction cost in Denver, CO

Denver homeowners typically pay $163,500 – $327,000 for adu construction. Local labor and materials price 9% above the national average.

Get my Denver estimate Use the Denver calculator

Denver average

$245,300

Typical low

$163,500

Typical high

$327,000

Per square foot

$275 – $545

Sample ZIP

80202

What drives Denver pricing

Local labor

Denver labor runs about 10% above the national average and books out in summer.

Permits & code

Denver permits required for roofing, structural, electrical and fences.

Climate & conditions

Hail is the top driver of roof replacement; freeze-thaw affects concrete.

Instant cost calculator

Adjust the inputs to see live pricing

ADU size (sq ft)600 square feet

Quality / material level

Site access

Removal / prep work

Timing

Estimated project cost

$145,350 – $196,650

Most homeowners pay around $171,000

Compare quality / material level

Cost by material in Denver

Installed Denver pricing per square foot.

Option	Installed cost	Pros	Cons
Prefab studio ADU	$255 – $345	—	—
Site-built 1-bedroom	$345 – $460	—	—
Site-built 2-bedroom	$460 – $595	—	—
Custom high-end ADU	$595 – $820	—	—

Where the money goes in Denver

A typical $245,300 Denver project, broken down by line item.

Labor0.45% · $1,104
Materials0.38% · $932
Permits & inspections0.05% · $123
Overhead & profit0.12% · $294

Common add-ons

Extras that show up on Denver quotes but rarely in the headline price.

Utility connections

$8,700 – $32,700

Site work and foundation

$16,400 – $65,400

Design and permits

$8,700 – $32,700

Impact fees

$2,200 – $21,800

Ways to save in Denver

Use pre-approved ADU plans where your city offers them — saves months and design fees.
Detach only if required; attached and conversion ADUs cost far less.
Collect three written bids on an identical scope — spreads of 20–40% are normal.
Book in the off-season and stay flexible on the start date to save 5–15%.
Bundle nearby work into one mobilization so you only pay setup and travel once.
Ask what the contractor would change to cut 10% without hurting durability.

Denver FAQs

Get a Denver price you can budget against

Answer a few questions about your project and we'll model a low, average and premium price for your CO ZIP code — then connect you with vetted local pros.

Get free quotes from certified pros

More Denver research

Best adu construction companies in Denver ADU Construction permits in Colorado ADU Construction near me All Colorado prices

ADU Construction cost near Denver

ADU Construction cost in Aurora, CO

$157,500 – $315,000

ADU Construction cost in Lakewood, CO

$160,500 – $321,000

ADU Construction cost in Boulder, CO

$177,000 – $354,000

ADU Construction cost in Arvada, CO

$159,000 – $318,000

ADU Construction cost in Westminster, CO

$159,000 – $318,000

ADU Construction cost in Centennial, CO

$162,000 – $324,000

More Colorado cities

Colorado Springs Fort Collins Greeley Pueblo Thornton Longmont Loveland

Other project costs in Denver

Fence Installation in Denver

$1,635 – $4,360

Roof Replacement in Denver

$9,265 – $37,060

Kitchen Remodel in Denver

$19,620 – $103,550

HVAC Replacement in Denver

$5,995 – $19,620

Deck Building in Denver

$4,796 – $13,080

Window Replacement in Denver

$491 – $1,635

See every Denver cost guide