Basement Finishing in Centennial, CO

Turn Centennial’s unfinished basements into legal living space

Centennial’s 1960s-1980s ranch, split-level, and two-story homes often have basements that were left unfinished or only partly finished when built. PrimeStone Construction Group designs and builds finished basements that add real bedrooms, bathrooms, and living space, engineered to handle the Front Range soil and moisture conditions common in this part of Arapahoe County.

How much does basement finishing cost in Centennial? Basement finishing in Centennial typically runs $30,000–$115,000+ (average around $65,000, or $65–$125/sq ft), depending on layout, egress requirements, and finish level.

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Why Centennial Homeowners Choose PrimeStone for Basement Finishing

Structural engineer-owned: PrimeStone is owned by a structural engineer, which matters in basements where foundation conditions, support columns, and expansive clay soils affect what can be built.
Design-build under one roof: Design and construction are handled by the same team, reducing miscommunication between layout decisions and what the existing foundation and ceiling height can actually support.
Experience with older Centennial homes: Many Centennial basements were built decades ago with lower ceiling heights, minimal waterproofing, and no egress windows, and PrimeStone works within those constraints to create code-compliant space.
Licensed and insured: All work is performed by a licensed, insured contractor familiar with permitting through the City of Centennial and with HOA approval processes in Centennial neighborhoods.

Basement Finishing for Centennial Homes

Centennial’s housing stock, built mostly from the 1960s through the 1980s, commonly includes basements that are either fully unfinished or finished with outdated materials and low ceilings. Because the city sits on Front Range expansive clay soils, foundation movement over the decades can affect walls, floors, and moisture control, so waterproofing and drainage work are often part of a basement finishing project here. Adding an egress window is frequently necessary to create a legal bedroom, since many of these older basements were never built with one. PrimeStone also evaluates radon mitigation needs, as it is a common consideration for finished basements throughout the Denver metro area.

Egress windows and legal bedrooms: Older Centennial basements often lack egress windows, so adding one is typically required to convert basement space into a code-compliant bedroom.
Waterproofing and moisture control: Expansive clay soils in the area make moisture management and foundation-related waterproofing an important part of basement finishing in Centennial.
Radon mitigation: Finished basements in the Denver metro region commonly include radon mitigation as part of the overall scope of work.

Basement Finishing Cost in Centennial

Basement finishing in Centennial typically costs $30,000–$115,000+ (average around $65,000, or $65–$125/sq ft). Costs rise with the addition of egress windows, bathrooms, wet bars, and work needed to address ceiling height or moisture issues common in older basements. Simpler projects that reuse existing layouts and skip plumbing additions tend to fall at the lower end of the range.

Planning your budget? Read our basement finishing cost guide for a full breakdown.

Permits for Basement Finishing in Centennial

Basement finishing in Centennial generally requires a building permit through the City of Centennial, particularly when adding egress windows, bedrooms, bathrooms, or electrical and plumbing work. Many Centennial neighborhoods also have HOAs, and while basement work is interior, some HOAs still require notification or approval depending on the scope, such as exterior egress window wells. PrimeStone manages the permitting process as part of its design-build service, coordinating the paperwork and inspections required to bring the space up to code.

PrimeStone confirms current permit and HOA requirements directly with the City of Centennial and the applicable HOA before work begins.

Full Basement Finishing Details

This page focuses on basement finishing specifically in Centennial. For our complete breakdown of process, costs, timelines, materials, and code requirements, see our main Basement Finishing page (linked here).

Frequently Asked Questions

How much does it cost to finish a basement in Centennial?

Basement finishing in Centennial typically runs $30,000–$115,000+ (average around $65,000, or $65–$125/sq ft). The final cost depends on whether egress windows, bathrooms, or wet bars are added and how much waterproofing work is needed.

Do I need a permit to finish my basement in Centennial?

Most basement finishing projects in Centennial require a building permit through the City of Centennial, especially when adding a bedroom, bathroom, or egress window. PrimeStone confirms current requirements with the city before starting work.

How long does basement finishing take in Centennial?

Most basement finishing projects take 6 to 10 weeks, depending on the scope of work and whether egress windows or plumbing additions are included.

Do I need an egress window to add a bedroom in my basement?

Yes, a legal bedroom in a basement generally requires an egress window for emergency exit, which is a common addition in Centennial’s older homes that were not originally built with one.

Is radon mitigation needed when finishing a basement in Centennial?

Radon mitigation is a common consideration for finished basements throughout the Denver metro area, including Centennial, and PrimeStone can evaluate whether it should be included in the project.

Will my HOA need to approve my basement finishing project?

Many Centennial neighborhoods have HOAs, and depending on the scope of work, such as adding an egress window well, HOA approval may be required in addition to the city permit. PrimeStone checks with the relevant HOA as part of the planning process.

Basement Finishing Guides

Ready to Start Your Centennial Basement Finishing Project?

Contact PrimeStone Construction Group to start planning a finished basement designed for Centennial’s older homes and soil conditions.

Get a Free Consultation → 720-468-0686 · info@primestonecg.com