Basement finishing in Highlands Ranch, from county permit to HRCA review

Two reviewers, two jobs: Douglas County inside, the HRCA outside

Highlands Ranch is an unincorporated community, the most populous one in Colorado, so building permits come from the Douglas County Building Division in Castle Rock. A permit is needed as soon as walls go up or electricity is added, and the plan set is specific: rooms labeled and dimensioned, every window sized, egress wells called out, and the furnace, water heater, stairs and alarms located.

Douglas County moved to the 2024 International Residential Code on July 1, 2026, so drawings submitted now are reviewed against that edition. Simple finishes can go through over-the-counter plan review on weekday mornings. We draw to the county's checklist during the permit phase of our process, so the reviewer sees what the inspector will later check.

Where the HRCA comes in

The Community Association does not review drywall. Its Architectural Review Committee looks at the outside of the house. The HRCA's Residential Improvement Guidelines say ARC approval may be required for replacement windows, with size among the considerations, and for any change affecting the established drainage pattern. A new egress window and well touches both: a larger opening in the foundation and fresh excavation at grade. The guidelines give the ARC 30 days to act once it has every required document, so that submittal goes on the calendar beside the county permit.

Newer houses, same ground: what a Highlands Ranch basement still needs

The first homes in Highlands Ranch were built in 1981, so most basements here are younger than Denver's. Younger is not the same as ready. Douglas County's basement finish guide is blunt about the reason: because soils in the county are expansive, non-bearing walls built on a slab must allow 3 inches of movement at the top or the bottom. The county considers a smaller gap only with a site-specific soils report from a professional engineer.

So the walls float. A treated plate is fastened to the slab, the wall itself hangs from the framing above, and the space between them lets the slab rise without driving the wall into the floor overhead. Skip it and the damage shows up later as cracked drywall.

Radon in a younger house

Douglas County's health department states that new homes carry the same risk of high radon as older ones. We ask for a test result before design. If a mitigation system already runs through the basement, its pipe and fan become fixed points in the layout. The county points residents to a free state test kit, one per household.

Egress even without a bedroom

Douglas County requires an emergency escape opening in every finished basement, whatever year the house was built, and in each basement bedroom; where there are bedrooms, their openings satisfy the rule. Existing wells with a 24-inch projection are accepted if every other egress condition is met. A new opening cut through the foundation needs a stamped structural engineer's plan.

The county's inspection order, and why we build to it

The county guide lays out the usual sequence. Underground plumbing is inspected before any slab patch is poured. Rough electrical comes next, with wire and boxes in place and no devices installed, and all low-voltage cable for data, speakers and security has to be in by then. Rough framing can be requested the same day but never first. Insulation follows, at least R-19 in the stud cavities or R-15 continuous, then drywall before tape, then final electrical and final building.

That low-voltage rule matters for anyone planning a basement media room or theater. Speaker wire that misses the rough electrical inspection means opening walls later, so we place every cable run during design.

Rooms that suit a Highlands Ranch lower level

A lower level usually has to do several jobs. A family lounge planned from the foot of the stair sets the layout for everything else. A guest suite with a legal bedroom depends on where an egress well can go without crowding a side yard or changing drainage, which is the HRCA question again. An office and gym on the same level works when the gym takes the tallest ceiling and the office takes the window.

Ceiling height decides a lot. Douglas County asks for 7 feet in habitable rooms and hallways and 6 feet 8 inches in bathrooms and laundry rooms, and it lets beams and ducts drop no lower than 6 feet 4 inches. We measure to the lowest duct at the site visit and draw soffits from that number.

Start planning a Highlands Ranch basement

Send the address, a few photos of the unfinished space and a short list of what the level needs to do. We will tell you what Douglas County will want to see, whether exterior work belongs in front of the ARC, and what the space can hold. Start your project here. Neighbors work under other building departments, as our pages on Littleton and Castle Rock explain.