Bathroom Remodeling in Lone Tree, CO

Bathrooms in Lone Tree range from builder-grade hall baths to primary suites that have not been touched since the house was new. Whatever the starting point, the rules come from the City of Lone Tree, which adopts the 2021 plumbing and residential codes with its own amendments and reviews every application online. The line between a fixture swap and a permitted remodel is spelled out on the city’s own list, and it is the first thing we look at.

Fixture Swap or Permitted Remodel?

Lone Tree publishes a short list of plumbing and electrical work that does not need a permit. Clearing stoppages, repairing leaks, and replacing fixtures, sinks, toilets and shutoff valves are exempt. So is replacing receptacles, switches and lights, and painting. A bath refresh that stays within that list can move without a permit.

Once a remodel goes past it, the general rule takes over. The city requires a permit to alter a building and to install, alter, relocate or replace plumbing, electrical, gas or mechanical systems. Moving a toilet or drain, turning a tub into a walk-in shower with new supply and drain lines, adding a circuit or opening a wall to reframe it all fall on the permitted side.

New water heaters also need a permit. The city lists them among its examples, and the 2026 Resident Guide names water heater installation as one of the common permits it sees.

Lone Tree’s Own Plumbing Amendments

The city adopts the 2021 International Plumbing Code under Ordinance 22-07, with several local changes. One that matters when a new bathroom vent goes through the roof: open vent pipes have to terminate at least 12 inches above the roof, or 7 feet above it where the roof is used for anything other than weather protection.

The amendments also delete the IPC’s sewer depth section. That is a small line in the ordinance, but it is a good example of why we read the local code rather than working from the base book alone. The adopted edition and the amendments are what the inspector will hold the work to.

Gas Lines and Heaters Near the Bath

Some bathroom projects involve gas, whether that is a relocated water heater or a new appliance close to the room. Lone Tree amends the fuel gas provisions of the residential code in ways worth knowing. It deletes two subsections from the prohibited-locations section for gas appliances, and it deletes the section that allows unvented room heaters entirely.

New or extended gas piping is pressure tested at 20 psi under the local amendment, or 60 psi for systems at or above 14 inches of water column. We plan the test and the inspection into the schedule so the walls stay open until the piping is signed off. Because these amendments change the base code, we confirm how they apply to a specific appliance with the Building Division before ordering it.

Airport Noise Rules for Bathrooms Near Centennial

Parts of Lone Tree sit in the Centennial Airport Overlay Area. The city’s building code says new homes, and alterations or repairs of existing homes, in that overlay that require noise mitigation must meet a table of minimum sound transmission ratings. As an alternative, a Colorado-registered acoustical engineer can certify that the construction will reach an interior level of DNL 45 dBA.

The same section speaks directly to bathroom work. It requires penetrations for piping, electrical devices, recessed cabinets, bathtubs, soffits and exhaust ducts to be sealed, lined or insulated so the wall keeps its rating. If your home is in the overlay and a remodel opens exterior walls, we raise it at plan review so the details are drawn before construction, not discovered at inspection.

Exterior Walls, Moisture and Your HOA

When a bathroom remodel reaches an outside wall, for a new window or exhaust termination, the exterior finish matters. The Building Division notes that residential window and door replacement does not need a permit unless the opening size changes. Stucco, stone or brick replacement does need one, so the city can confirm the moisture barrier is installed correctly.

Exterior changes also bring the HOA into the picture. The city strongly recommends HOA or architectural committee approval before starting permitted work, and it states that it does not govern HOAs itself. We get that approval lined up alongside the permit so neither one holds up the other.

How We Sequence a Lone Tree Bathroom Remodel

First we confirm whether the scope stays on the city’s exempt list or needs a permit. If it needs one, we prepare the drawings and valuation, submit through the city’s online portal, and pay the plan review fee at application, which is 65% of the permit fee with a $100 minimum.

After issue, we demolish to the studs, then rough in plumbing, venting, gas where it applies, the exhaust fan duct and the electrical. Rough inspections are requested online, and the city posts the daily inspection schedule between 8:00 and 9:00 a.m. on weekdays. Waterproofing goes in only after the rough work passes.

Tile, glass, vanity, fixtures and lighting follow, then the final inspection. Interior work stays within the city’s 7:00 a.m. to 9:00 p.m. window, and the site keeps the sanitation and trash containment the code requires during remodeling. We walk the finished room with you and close out the permit.

Common Questions

Can I replace a toilet or vanity in Lone Tree without a permit?
Yes, in most cases. The city lists replacing fixtures, sinks, toilets and shutoff valves, and repairing leaks, as work that does not need a permit. Moving a drain, adding supply lines or opening walls to rebuild the room does need one.

Does a new water heater need a permit in Lone Tree?
Yes. The city lists new water heaters among the projects that require a permit, and the 2026 Resident Guide names water heater installation as a common permit.

What does the airport overlay mean for my bathroom remodel?
If your home is in the Centennial Airport Overlay Area and the work requires noise mitigation, the city code sets minimum sound ratings and requires penetrations for pipes, tubs, recessed cabinets and exhaust ducts to be sealed so the wall keeps its rating. Confirm with the Building Division whether your address is affected.

Which plumbing code applies in Lone Tree?
The city adopts the 2021 International Plumbing Code with local amendments, such as the rule that roof vents end at least 12 inches above the roof. Confirm the current edition with the Building Division before design, since codes are updated over time.

Talk to Us About Your Project

Tell us what is not working in your bathroom, whether it is the layout, the shower or the storage. We will check the scope against the city’s exempt list, handle the Lone Tree permit and inspections when one is needed, and coordinate the plumbing, electrical and finish trades so the room goes together in the right order.