Further reading
Most bathrooms in this metro were built between 1950 and 1999, and almost all of them share the same three problems: a tub nobody uses, a fan that does not move enough air, and waterproofing that was adequate for its decade and is not adequate now. A bathroom remodel is a waterproofing and ventilation project with tile on top. That is the order we treat it in.
What a Bathroom Remodel Actually Involves
Scope, from smallest to largest
- Cosmetic refresh — vanity, fixtures, mirror, paint, lighting. Same layout, same plumbing locations. No permit needed if nothing behind the wall moves.
- Full replacement in place — everything comes out to the studs and subfloor, new waterproofing, new tile, new fixtures, but drains and supply stay where they are. This is the most common project we run and the best value per dollar.
- Layout change — moving a toilet, converting a tub to a curbless shower, relocating the vanity. Drain relocation means opening the floor, and on a slab that is a different job from a joisted floor.
- Adding a bathroom — new supply, new drain, new venting, and on a septic property, a capacity question before a design question.
Typical planning range
| Project | Planning range |
|---|---|
| Cosmetic refresh | $5,000–$12,000 |
| Full bathroom remodel | $12,000–$35,000 |
| Primary bath, layout change | $25,000–$60,000+ |
Ranges are for planning. We price a project after we have seen it, not before. Detailed cost breakdowns are in our Colorado bathroom remodeling cost guide.
Waterproofing Is Where Bathrooms Fail
Every failed shower we tear out failed in one of a handful of places, and none of them are the tile. Tile and grout are not waterproof; they are a wear surface over an assembly that is. What matters is what is underneath.
A shower built to last uses a continuous waterproof membrane — sheet or liquid-applied — over the substrate, with the corners, the curb and the drain flange treated as the critical details, because that is where water finds its way out. Cement backer board is a substrate, not a waterproofing layer, and installing tile directly on it without a membrane is the single most common shortcut in this market. Niches need the same membrane treatment and a sloped sill. The drain has to match the assembly: a bonded-flange drain for a membrane system, not a mismatched pairing that leaves a gap at the one point where all the water goes.
The reason this matters more than finish selection is the failure mode. Bad tile looks bad. Bad waterproofing rots the subfloor, the joists and the ceiling below, and it does it silently for years before it shows.
Ventilation, at This Altitude
Denver’s dry climate is not a reason to skip ventilation — a shower produces the same moisture at 5,280 feet as anywhere else, and the air’s low relative humidity means large swings that are hard on grout and paint. Code requires exhaust ventilation in a bathroom without an operable window; in practice every bathroom wants a fan sized to the room, ducted to the exterior and not into the attic, with insulated duct so warm moist air does not condense on its way out. A fan on a timer or a humidity sensor is worth the small extra cost, because a fan that runs for three minutes after a shower is a fan that does nothing.
What We Find Behind Front Range Bathroom Walls
The house’s decade predicts the surprises, and in this metro the decades are well defined.
- Pre-1950 — galvanized supply piping at or past its 40 to 50 year life, corroding inward. This is why the pressure is poor, and new fixtures alone will not fix it. Often knob-and-tube wiring nearby.
- 1950s–60s — cast iron drain lines with a 75 to 100 year service life, mud-set tile over wire lath, and asbestos in floor tile, mastic and ceiling texture.
- 1960s–70s — aluminum branch wiring in some north metro stock, and single-pane windows in wet rooms.
- 1980s–90s — the corner jetted tub, the framed glass enclosure over an unwaterproofed pan, and a fan vented into the attic. Douglas County and south Arapahoe are full of these, and they are now all at end of life at once.
Asbestos and lead are not optional line items
Colorado’s Regulation 8 applies to a house of any age. Inspection by a Colorado-certified asbestos building inspector is required once the work will disturb 32 square feet of material, 50 linear feet on pipe, or the equivalent of a 55-gallon drum. Friable material must be removed by a certified General Abatement Contractor before demolition, and only an accredited laboratory can clear a sample. On pre-1978 homes the federal Renovation, Repair and Painting rule requires certified lead-safe work practices once painted surfaces are disturbed. A bid that omits this is not cheaper — it is incomplete.
Permits, by Jurisdiction
A bathroom remodel needs a permit almost everywhere in this metro once plumbing, electrical or walls change; cosmetic-only work generally does not. Where it differs is who issues it and how long it takes.
- Denver — Community Planning and Development. Projects under $500,000 with no other agency approval can qualify for a same-day walk-through permit.
- Unincorporated Jefferson County — a permit is required when walls or utilities move; interior work needing no Planning and Zoning review can be permitted same-day by appointment, Monday through Thursday.
- Unincorporated Arapahoe County — permit required, and plan review averages 6 to 8 weeks under $100,000. That is a schedule fact, not a formality.
- Unincorporated Adams County — permit required when electrical or plumbing changes; staff review 10 to 20 business days.
- Unincorporated Douglas County — permit required for structural, plumbing, electrical, HVAC or major upgrades, under the 2021 IRC. In Highlands Ranch, metro district approval comes before the county permit.
Cities inside those counties — Aurora, Centennial, Englewood, Littleton, Thornton, Commerce City, Lakewood, Golden, Wheat Ridge, Arvada, Edgewater, Morrison, Castle Rock, Parker, Lone Tree — run their own departments with their own portals. The jurisdiction follows the address, not the mailing city.
Aging in Place, Done Properly
A large share of the bathrooms we remodel are for owners who intend to stay in the house. The changes that matter are structural and cheap to do during a remodel, expensive to retrofit later: blocking in the walls for grab bars even if the bars go in years from now, a curbless shower entry with the slope built into the pan rather than a ramp added on top, a 36-inch clear door opening, a comfort-height toilet, and lever handles. None of these have to look clinical. Done during the framing stage they cost very little; done afterwards they mean opening the wall again.
How the Project Runs
We walk the bathroom before quoting, because the number depends on what is behind the wall — the supply piping, the drain material, whether the floor is slab or joisted, whether painted surfaces are pre-1978. The written scope names the permit authority, the waterproofing assembly by manufacturer and system, the inspections, and who pulls them. Demolition and any required abatement come first, then rough plumbing and electrical with inspection, then waterproofing with a flood test on the pan before a single tile goes down, then tile, then finish. If something is discovered inside a wall you hear about it the same day with the cost impact attached.
Where We Work
Across the Denver metro and the Front Range: Denver, Jefferson County, Arapahoe County, Douglas County and Adams County. Each has its own permit authority and its own review timeline, and we confirm which one applies to your address before any design work starts.
Bathroom Remodeling by City
Permit rules, inspections and lead times for bathroom remodeling change from one jurisdiction to the next. Pick your city:
Counties We Cover
Full service-area coverage by county:
Common Questions
How long does a bathroom remodel take?
The construction itself typically runs three to five weeks for a full remodel. The variable is permitting, which ranges from same-day in Denver and unincorporated Jefferson County to 6 to 8 weeks of plan review in unincorporated Arapahoe. We give you both numbers separately so the schedule is honest.
Can I use the bathroom during the work?
Not that one. If it is the only bathroom in the house, we sequence the work to minimise the days without a toilet and tell you exactly which days those are before you commit.
Is a curbless shower possible in my house?
Usually, and it depends on the floor. On a joisted floor the drain assembly can often be recessed between joists. On a slab the options are a recessed pan, which means cutting concrete, or a very low profile entry. We determine which before designing it, not after.
Do you move plumbing?
Yes, and we are honest about what it costs. Relocating a toilet drain is the most expensive single move in a bathroom because of the slope requirement on the waste line. Sometimes the better answer is a layout that keeps the drain and gains the same result.
Choosing Materials That Survive a Dry Climate
Denver’s low humidity is hard on some materials and irrelevant to others, and the difference is worth knowing before selection.
Tile. Porcelain has a water absorption rate at or below 0.5% and is the default for floors and wet walls. Ceramic is fine for dry walls and costs less. Natural stone — marble, travertine, slate — is porous, needs sealing on a schedule, and etches under acidic cleaners; it is a legitimate choice made with open eyes, not a low-maintenance one. Large-format tile means fewer grout lines but demands a flatter substrate, and the substrate prep is where the labour goes.
Grout. Cement grout is porous and needs sealing. Epoxy grout does not absorb water, resists staining and costs more to install because it is unforgiving to work with. In a shower floor with small mosaic tile and a lot of grout line, epoxy earns its price.
Countertops. Quartz is engineered, non-porous and needs no sealing. Granite is natural, needs periodic sealing, and each slab differs. In a bathroom the spans are small, so the price gap between materials is much narrower than in a kitchen — this is the room to use the material you actually want.
Cabinetry. Solid wood moves with humidity swings; plywood boxes with a quality veneer are more stable in this climate than particle board, and a bathroom vanity lives in the wettest room in the house.
Fixtures, Water Pressure and the Panel
Two practical constraints decide what fixtures make sense in an older Front Range house. The first is supply capacity: a large rain head and a set of body sprays draw more volume than a corroded galvanized line or an undersized supply can deliver, and no fixture solves that. If the piping is original, replacing it during the remodel is the moment it costs least. The second is electrical: heated floors, a heated towel bar, a powerful fan and modern lighting add circuits, and an older panel may not have the capacity. We check both at the walk-through, because they change the design, not just the price.
Recent Work
Real photos from a completed bathroom remodeling project in Denver, CO.
Related Services
Kitchen remodeling · Tile work · Home additions · Painting · Colorado remodeling price guide
For how a bathroom project gets paid for, see our payment options page.