The tub-to-shower conversion is one of the most-requested bathroom projects we do in Colorado Springs — and one of the most frequently done wrong. Not because it’s technically complicated, but because there’s a critical step that looks unglamorous, costs real money, and is easy to skip. That step is waterproofing. In Colorado’s climate, skipping it or doing it halfway turns a $6,000 shower into a $6,000 problem within three to five years.
Here’s the honest breakdown of what this project involves, what it costs, and why our specific climate makes waterproofing more consequential than most contractors will tell you.
What a Tub to Shower Conversion Actually Involves
The typical Colorado Springs bathroom has a 5-foot tub alcove — three walls, a tub, a shower valve above it. Converting that to a walk-in shower involves:
- Demo — removing the tub, tub surround, and any existing tile or drywall in the wet zone
- Drain assessment — determining whether the existing tub drain location works for a shower or needs relocation
- Substrate preparation — installing cement board or waterproof backer on all walls in the wet zone
- Waterproofing — applying a sheet-applied or liquid membrane system to every surface before tile
- Tile installation — floor, walls, any niche or bench
- Grouting and sealing
- Glass door or enclosure installation
- Fixture installation — new shower valve, showerhead, controls
On a concrete slab home (which most Colorado Springs homes are), drain relocation means jackhammering the slab, re-routing the drain line, and patching back. On a crawl space or basement home, it’s more accessible. This distinction matters for both cost and timeline.
The Two Paths: Prefab vs. Custom Tile
Prefab acrylic or fiberglass unit ($1,500–$3,500 installed): A one-piece or multi-panel shower unit that drops into the existing footprint. It goes in fast — typically one to two days. The waterproofing is built into the unit itself, which eliminates the membrane installation step. The tradeoffs: limited size and style options, seams between panels that need caulking and occasional maintenance, and a finish that reads as manufactured rather than custom. For a secondary bathroom, a rental property, or a budget-constrained primary bath, prefab is a completely reasonable choice.
Custom tile shower ($4,000–$12,000): A site-built shower with a waterproofing membrane system, tile floor and walls, and frameless or semi-frameless glass. The upper end of that range reflects premium large-format tile, linear drain, frameless glass, and a bench — the lower end is standard porcelain tile and a framed glass door. This is the scope most Colorado Springs homeowners are considering when they research tub-to-shower conversion, and it’s what the rest of this article addresses.
Why Waterproofing Is the Most Important Line Item
Water damage behind shower tile is one of the most expensive problems in a home. The visible failure — grout cracking, tile popping off, soft spots in the wall — happens after months or years of invisible moisture infiltration. By the time it’s visible, the damage behind the wall is typically substantial.
In Colorado Springs, this plays out faster and more severely than in most climates. The reason: 100+ freeze-thaw cycles per year. Any moisture that infiltrates behind the tile — through a failed grout line, a cracked backer board, or a membrane that wasn’t fully applied — doesn’t just sit there and cause mold. It freezes. Water expands approximately 9% when it freezes. That expansion physically stresses the tile adhesive, the grout, and eventually the backer and framing behind it. Each freeze-thaw cycle widens the damage. A shower that might last 10 years with a compromised membrane in a mild climate fails in three to five years in Colorado Springs.
The correct waterproofing system for a tile shower is a sheet-applied membrane applied to every surface in the wet zone before tile goes on. The industry standard we use is Schluter Kerdi — an 8-mil polyethylene membrane that bonds to the substrate in thinset and creates a fully waterproof, vapor-tight assembly. Every seam is overlapped and treated with Kerdi-Band. Every penetration — the drain, the showerhead, the valve — is sealed with Kerdi-Fix. The membrane runs from the shower floor up the walls to at least shower head height, including the floor-to-wall and wall-to-wall transitions.
This is not a step that can be partially done or approximated. If the membrane has a gap — even a small one at a corner or around a drain — water finds it.
After the membrane is installed, it gets a 24-hour cure before tile sets. This is not optional. Setting tile on a membrane that hasn’t fully cured compromises the bond.
The Drain Question
Tub drains are typically located at one end of the tub, near the foot. Shower drains are typically centered — which is where the floor slope needs to direct water. In most tub-to-shower conversions, the drain needs to move.
On a concrete slab (the majority of Colorado Springs homes built after 1980), moving the drain means cutting the slab, re-routing the drain line, and patching the concrete back. This adds $500–$1,500 to the project depending on distance of relocation and access. It’s not optional — a centered drain is what allows the tile floor to slope properly to drainage without creating standing water.
Some conversions work around the drain location using a linear drain positioned at the entry edge of the shower rather than centered. This eliminates the need to move the drain in some configurations and can create a clean, contemporary look with large-format tile.
Tile Selection for Colorado
The material considerations for shower tile in Colorado overlap with our general hard water reality — at 11.7 grains per gallon, mineral deposits are visible on anything with texture or porosity.
Porcelain tile is the right call for shower floors and walls in Colorado Springs. It’s non-porous, handles hard water without staining, and the quality available in the $3–$12/sq ft range has improved dramatically. Matte-finish porcelain on floors provides grip without the grout-line maintenance that mosaic floors require.
Natural stone is beautiful and high-maintenance in our water. Travertine and marble require sealing every 6–12 months and will still show mineral etching and deposits at our calcium levels. If you want stone aesthetics without stone maintenance, large-format porcelain in stone-look finishes is the practical Colorado choice.
Grout: Epoxy grout costs more upfront and is slightly more demanding to apply, but it doesn’t stain, doesn’t crack, and is essentially impervious to hard water mineral penetration. For shower floors where grout is under constant moisture stress, it’s worth the premium.
What Drives Cost Up or Down
Up: Relocating the drain (especially on slab), frameless glass vs. framed, large-format tile (more labor to set correctly), niche or bench construction, heated floor installation under the shower tile.
Down: Keeping the drain in place, framed or semi-frameless glass, standard 12×24 porcelain, no niche or bench, using the existing valve location.
The difference between a $4,500 conversion and a $10,000 conversion is usually the glass and the tile — not the waterproofing. Don’t cut the membrane budget to upgrade the tile. The membrane is what keeps the tile in place five years from now.
PPRBD Permit Requirements
If the drain stays in place and no plumbing moves, a tub-to-shower conversion is permit-exempt in Colorado Springs. If the drain relocates, a PPRBD plumbing permit is required. We handle the permit process and schedule the required inspection on every project that needs it.
Every conversion gets a written flat-rate estimate — demo, waterproofing, tile, glass, fixtures, and any plumbing work — before we start. The number on the estimate is what you pay.
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