How much does adu construction cost in Centennial, CO?

Most Centennial homeowners spend between $162,000 – $324,000 on adu construction, with an average around $243,000. Local labor prices 8% above the national average, so Centennial quotes tend to land at the higher end of national ranges.

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

South metro suburb with higher-end finish expectations. Hail season concentrates exterior work in summer.

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

City permits plus HOA architectural approval. 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 Centennial?

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/Centennial, CO

Denver · Colorado

ADU Construction cost in Centennial, CO

Centennial homeowners typically pay $162,000 – $324,000 for adu construction. Local labor and materials price 8% above the national average.

Get my Centennial estimate Use the Centennial calculator

Centennial average

$243,000

Typical low

$162,000

Typical high

$324,000

Per square foot

$270 – $540

Sample ZIP

80112

What drives Centennial pricing

Local labor

South metro suburb with higher-end finish expectations.

Permits & code

City permits plus HOA architectural approval.

Climate & conditions

Hail season concentrates exterior work in summer.

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

$142,500 – $196,650

Most homeowners pay around $169,575

Compare quality / material level

Cost by material in Centennial

Installed Centennial pricing per square foot.

Option	Installed cost	Pros	Cons
Prefab studio ADU	$250 – $345	—	—
Site-built 1-bedroom	$345 – $455	—	—
Site-built 2-bedroom	$455 – $585	—	—
Custom high-end ADU	$585 – $810	—	—

Where the money goes in Centennial

A typical $243,000 Centennial project, broken down by line item.

Labor0.45% · $1,094
Materials0.38% · $923
Permits & inspections0.05% · $122
Overhead & profit0.12% · $292

Common add-ons

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

Utility connections

$8,650 – $32,400

Site work and foundation

$16,200 – $64,800

Design and permits

$8,650 – $32,400

Impact fees

$2,150 – $21,600

Ways to save in Centennial

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.

Centennial FAQs

Get a Centennial 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 Centennial research

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

ADU Construction cost near Centennial

ADU Construction cost in Denver, CO

$163,500 – $327,000

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

More Colorado cities

Colorado Springs Fort Collins Greeley Pueblo Thornton Longmont Loveland

Other project costs in Centennial

Fence Installation in Centennial

$1,620 – $4,320

Roof Replacement in Centennial

$9,180 – $36,720

Kitchen Remodel in Centennial

$19,440 – $102,600

HVAC Replacement in Centennial

$5,940 – $19,440

Deck Building in Centennial

$4,752 – $12,960

Window Replacement in Centennial

$486 – $1,620

See every Centennial cost guide