Bathroom Remodeling in Commerce City, CO

A bathroom remodel in Commerce City looks simple on paper, but the city’s permit list and its published construction details reach into the shower, the vanity wall, the fan, and the outlets. The Building Safety Division reviews and inspects the work, and applications go in online through eTRAKiT. We plan each Commerce City bathroom around the dimensions the city prints in its own guides, so the room passes inspection and still feels generous to use.

What Triggers a Bathroom Permit in Commerce City

The city’s permit guide exempts floor finishes, replacement of interior finishes, and non-structural cosmetic repairs. New tile over sound walls, a new mirror, paint, and a new floor usually fall on that side. Bathroom work crosses into permit scope when it involves interior alterations, new plumbing fixtures, or new electric appliances.

Commerce City does not publish an exemption for swapping a fixture in the same spot. The guide only states that new plumbing fixtures need a permit. Because the city does not say whether a like-for-like toilet or vanity swap counts, we ask the Building Safety Division when a project sits on that edge rather than guessing.

Water heaters come up often during bathroom work. The city lists new and replacement gas appliances as permit work, so a gas water heater replacement tied to a bathroom project needs its own permit coverage. Interior remodels use the Residential Alteration (RALT) permit type, with separate plumbing and gas permit types for trade-only work.

Shower Size, Glass, and Water Temperature

The most detailed bathroom numbers Commerce City publishes sit in its Typical Basement Finish Details guide, Version 2021.0, dated May 2023 and based on the 2021 International Residential Code. The guide is written for basement finishes, but it reflects the same residential code the city enforces throughout the house. We use it as a checklist and confirm with the city for upstairs bathrooms.

A shower needs at least 900 square inches of floor area and a minimum dimension of 30 inches. The guide allows a 25-inch minimum dimension when the shower has 1,300 square inches of area. Hinged shower doors must open outward, and all glass enclosing a shower must be safety glazing.

Shower valves must be scald resistant and meet ASSE 1016, with hot water limited to 120 degrees Fahrenheit. Tub and shower walls get cement or fiber-cement board under a non-absorbent finish. Those details matter in a tile shower, where the backer board is hidden and the inspector sees it only before the tile goes on.

Clearances That Shape the Layout

The city’s guide spells out fixture spacing. It calls for 21 inches of clear space in front of sinks and toilets and 24 inches in front of a shower opening. A toilet needs 15 inches from its centerline to any wall or fixture on each side.

Smaller gaps matter too. The guide lists 4 inches between adjacent sinks, between a sink and a toilet, and between a sink and a wall, plus 2 inches between a sink and a tub. In a narrow hall bathroom, those numbers decide whether a double vanity fits or whether a single sink with more counter works better.

Drain sizes are listed as well: 1¼ inches for a bathroom sink and 1½ inches for a tub, a shower, and other sinks. We check the existing drain lines against those sizes before we promise a new shower location, because rerouting plumbing in the floor is often the biggest variable in a bathroom schedule.

Fans, Lights, and Outlets

Commerce City’s guide says a bathroom must have a fan vented directly to the outside. A fan is not required when the room has a window with an opening of at least 1.5 square feet. Many older bathrooms rely on a small window, so we measure the opening before deciding whether a new fan and duct run belong in the scope.

Bathroom receptacles need a dedicated 20-amp branch circuit, and at least one outlet must sit on a wall next to each basin, within 36 inches of the sink. All bathroom outlets must be GFCI protected, outlets must be tamper resistant, and branch circuits use combination arc-fault breakers.

Light fixtures cannot sit within 3 feet horizontally and 8 feet vertically of a tub rim or shower threshold unless they are marked suitable for wet locations. The city enforces the 2023 National Electrical Code for permits applied for after August 1, 2023, with underground, rough-in, and final electrical inspections.

Shower Walls on Moving Slabs

Commerce City’s basement guide recognizes that expansive soils can make a slab heave. It recommends floating partitions where that can happen and requires a floating connection at the top of partitions that surround a shower. The gap lets the slab move without cracking the shower walls or the tile.

That rule is written for basement bathrooms, and it is one of the clearest local signals about soil movement the city publishes. When a bathroom sits on a slab, we build the shower framing to that detail so the room holds up season after season.

How We Sequence a Commerce City Bathroom Remodel

We begin by measuring the room against the city’s clearance numbers and deciding what changes: fixtures, drains, the fan, circuits, or walls. If the work needs a permit, we prepare a RALT application in eTRAKiT. The city’s published timeframes put initial residential review at 14 days from the completeness review, with 7 days for each follow-up, and we plan the start date around that.

After the permit is issued, demolition exposes the plumbing and wiring, and rough plumbing and electrical go in for the rough-in inspections, which are booked in eTRAKiT by 4 p.m. the business day before. Backer board, waterproofing, tile, glass, and fixtures follow, then the final inspections close the permit.

Common Questions

Do I need a permit to remodel a bathroom in Commerce City?
It depends on the scope. Floor finishes, interior finish replacement, and cosmetic repairs are exempt. Interior alterations, new plumbing fixtures, and new electric appliances need a permit. The city does not state whether a same-location fixture swap is exempt, so confirm that case with the Building Safety Division.

How big does a shower have to be?
The city’s Typical Basement Finish Details guide, based on the 2021 IRC, lists a minimum of 900 square inches and a 30-inch minimum dimension, or 25 inches when the shower has 1,300 square inches of area. The guide is written for basements, so confirm upstairs details with the city.

Does my bathroom need an exhaust fan?
The city’s guide says bathrooms need a fan vented directly outside. A fan is not required when the bathroom has a window with an opening of at least 1.5 square feet.

What electrical rules apply to bathroom outlets?
The guide calls for a dedicated 20-amp circuit for bathroom receptacles, an outlet within 36 inches of each basin, and GFCI protection on all bathroom outlets. Commerce City enforces the 2023 National Electrical Code for permits applied for after August 1, 2023.

Talk to Us About Your Project

Tell us what bothers you about your bathroom today, from a cramped shower to a missing fan or too few outlets. We measure the room against Commerce City’s published clearances, prepare the permit when the scope needs one, and coordinate licensed plumbing and electrical trades through inspection.