Basement Finishing in Centennial, CO

Most Centennial homes were built from the 1970s through the 2000s, in neighborhoods like Willow Creek, Homestead, Southglenn, and Piney Creek. Many have full basements, often unfinished or finished decades ago. Gribbons Group Corp is a licensed & insured general contractor, and we plan each basement around Centennial’s checklist so the permit goes through cleanly.

Have a Centennial basement question? Call (720) 223-9003 or request a free estimate.

How Centennial Basement Permits Work

The City of Centennial Building Division issues basement permits through its online portal. Its single family basement finish guide lays out what reviewers check:

• Finished ceilings of at least 6′-8″ in existing basements, and 6′-4″ under beams and ducts.
• An egress window or exterior door in every sleeping room, with a proper well when the sill is below grade.
• Fireblocking in furred walls, R-19 cavity or R-15 continuous insulation on perimeter walls, and drywall under accessible stairs.
• Furnace and water heater clearances, including 30 inches of working space in front of each.
• An engineer’s plan or letter for new openings in the foundation or bearing walls.

Homes with fire sprinklers may need South Metro Fire Rescue review, and homes on septic adding a bedroom need county health approval. The city’s Building FAQ also says every contractor and subcontractor on a permit must be licensed in the City of Centennial. We confirm that before we schedule.

Egress in Plain Terms

Centennial requires a code-compliant egress window or exterior door in each sleeping room, with a well when the sill is below grade. See our 12-step basement process for how we size and permit egress windows.

What We Typically Find in Centennial Basements

• 1970s and 1980s homes with lower beams, small windows, and dated finishes that need to come out.
• 1990s and 2000s homes with taller poured walls, builder egress, and plumbing roughed in.
• HOAs in most neighborhoods. A new window well may need architectural approval.

Centennial’s Checklist, Item by Item

• Structure: any new opening in the foundation or a bearing wall needs a plan or letter from a registered engineer, and changes to posts, beams, or joists must be shown on the plans.
• Ceilings: the plans must flag every area under 7 feet. The minimum is 6′-8″ in existing basements and 6′-4″ under beams and ducts.
• Windows: list the size and type of every window being installed.
• Fire sprinklers: homes with an automatic fire suppression system need sprinkler plans submitted to and approved by South Metro Fire Rescue.
• Septic: homes on septic adding a basement bedroom need an approval letter from Arapahoe County Public Health.

All of this comes from the city’s basement finish guide. An incomplete submittal gets sent back, so we build the package to the list. The same guide also requires half-inch drywall inside any enclosed storage under the stairs, and R-19 cavity or R-15 continuous insulation on the perimeter walls.

Mechanical Rooms, Outlets, and Fireblocking

Centennial’s basement finish guide goes beyond the floor plan. A furnace or water heater can’t sit in or be reached through a bedroom or bathroom unless it’s a direct-vent unit. Enclosed appliances need enough combustion air, and each one needs 30 inches of clear working space in front, with room to service or replace it without tearing out walls, piping, or wiring.

Electrical has its own rules. Receptacles have to be spaced so no point along the wall is more than 6 feet from an outlet, and hallways 10 feet or longer need at least one. Fireblocking goes in furred walls at the ceiling and every 10 feet, and wherever walls meet soffits or dropped ceilings.

None of that is unusual, but it decides where the mechanical room door goes, how big the storage room has to be, and where the soffits run. We draw those details into the plan, so the framing inspection holds no surprises.

Moisture, Soils, and Radon

Older Centennial basements sometimes show signs of past water, such as stained walls or a busy sump, and we sort those out before framing. Radon is common throughout Colorado, according to the Colorado Department of Public Health and Environment, so we recommend testing before you finish.

What Centennial Homeowners Build Downstairs

Centennial families often ask for a teen hangout or media room, a guest bedroom with a bath, a home gym, or a sauna.

How We Work

We walk the basement, draw the plan to the city checklist, coordinate South Metro Fire when sprinklers are involved, and manage inspections. Projects typically run 1 to 6 months, with a 30 to 50% deposit to schedule. See our main Denver basement finishing page for more.

Nearby, we also finish basements in Highlands Ranch, Littleton, Aurora, Parker, Lakewood, and Castle Rock.

Centennial Basement FAQs

What ceiling height does Centennial require?

At least 6′-8″ in existing basements and 6′-4″ under obstructions like beams and ducts, per the city’s basement finish guide.

My home has fire sprinklers. Does that matter?

It can. Sprinklered homes may need South Metro Fire Rescue review for the basement layout, and we coordinate it.

Does every basement bedroom need its own egress window?

Yes. Centennial requires a code-compliant egress window or exterior door in each sleeping room.

Request a Centennial Basement Estimate

Send us a few details about your basement and your address. We’ll confirm which office issues your permit and set up a walkthrough.