Most tub-to-shower conversions on Chicago’s North Shore land between roughly $6,000 and $30,000 installed. That’s a wide band, and it frustrates homeowners who just want a number. The spread comes down to one question that almost no quote spells out: does the floor get opened?
An acrylic pan set over the old tub footprint sits at the bottom of that range. A tiled walk-in shower on a new pan, with the drain reworked and enlarged, sits at the top. Glass, niches, and fixtures move you around inside the band. The floor decides which half of it you’re shopping in.
What a Tub-to-Shower Conversion Costs by Scope
Scope is the honest way to price this work. Four routes cover almost every North Shore bathroom, and each one carries a different amount of demolition behind it.
| Route | Installed planning range | Does the floor open? | Best fit |
|---|---|---|---|
| Acrylic or composite pan over the same footprint. | About $6,000 to $12,000. | Rarely. | Sound subfloor and no layout change. |
| Prefab base with panel or tile walls. | About $9,000 to $18,000. | Sometimes. | Same footprint, better finish. |
| Custom tile shower on a new pan. | About $15,000 to $30,000. | Yes. | Full tile, a bench, frameless glass. |
| Conversion plus a layout change. | Roughly $25,000 and up. | Yes, and widely. | Moving a toilet, a vanity, or a wall. |
Read those rows as tiers of disruption rather than tiers of taste. A route that never opens the floor is a short job with a small crew. A route that does is a longer one, with a plumber, a tile setter, and an inspection between them.
Why the Drain Decides the Price
A bathtub drains through a 1½-inch waste line in most homes. A shower can’t use one. The Illinois Plumbing Code is blunt about it: shower receptacle waste outlets shall be at least 2 inches in diameter. Getting from 1½ inches to 2 means cutting the floor, reworking the trap, and tying back into the branch line.
That one change drags a list of other work behind it. The subfloor gets patched. The waterproofing starts over. Sometimes a joist sits where the new trap needs to go, and the drain shifts a few inches, which changes where the pan has to slope.
It’s the same principle that separates a cosmetic bathroom update from a structural one. Sorting your list by which upgrades move plumbing and which don’t will tell you more about your budget than any tile sample can.
Older North Shore housing makes this harder to predict. Kitchen Design Partners designs across Evanston and Deerfield homes that were never framed square, and across high-rise condos with fixed plumbing stacks, so the drain answer is rarely the same twice. Cast iron lines, tight joist bays, and floors that were leveled decades ago all show up the day the tile comes off.
What a One-Day Conversion Actually Buys You
Bath to shower conversion companies build their pricing around never opening the floor. A molded acrylic or composite pan drops into the existing alcove, wall panels go up over the old surround, and the crew is out fast. It’s a legitimate product for a specific situation, and for plenty of bathrooms it’s the right buy.
It works best when the subfloor is sound, the drain already sits where you want it, and the goal is a safe, low-threshold shower rather than a design statement. A second bathroom nobody photographs. A rental between tenants. A parent who needs an easier entry now, not in six weeks.
It works badly when the alcove isn’t square, which is ordinary in prewar homes around here, or when there’s any sign of old water damage under the tub. Panels bridge over a bad substrate instead of correcting it. You’ve bought a surface rather than a repair.
The trap is treating the two quotes as prices for the same thing. One is a system installed over what’s already there. The other is construction that replaces it. Line them up on what happens behind the wall and the gap stops reading like a discount.
So ask one question before signing either kind of contract. What happens if the crew opens the wall and finds rot? A system installer may not be set up for that work, and knowing who handles it, at what price, is worth more than any promotional discount.
Waterproofing Is the Line You Never See
A tub is its own waterproof vessel. Pull it out and that protection leaves with it. What replaces it is a pan assembly, and it’s the part of a shower most likely to fail years later.
What the hidden layer actually costs you
Under the tile sits a pan liner, a sloped mortar bed, and a bonded waterproof membrane. None of it shows once the job is done. All of it is why two quotes for the same-looking shower can sit thousands of dollars apart.
Budget conversions save money here, and that’s the trade being made. A rushed pan doesn’t leak on day one. It weeps slowly into the joist bay, and you find it when the ceiling below starts to stain.
Ranges only get a homeowner so far. If you want a real figure for your own bathroom, book a free design consultation and bring photos of the tub wall and the ceiling underneath it.
Glass, Tile, and Fixtures Move the Number Next
Once the wet work is settled, the visible choices take over. Tile is the biggest of them. A large-format porcelain wall with few grout lines sets faster than a mosaic floor with a linear drain, and the labor gap between those two is wider than the material gap.
Glass is the second lever. A framed sliding door is the budget answer, while frameless glass panels bring thicker glass, custom measuring after the tile is set, and a longer wait for delivery.
Fixtures look like the small decision, and often aren’t. A rain head plus a hand shower usually means a larger valve and more hot water pulled at once. The EPA’s WaterSense program notes that standard showerheads use 2.5 gallons of water per minute, so running two heads together can outrun an older water heater. That’s a quiet line item people discover after the drywall is closed.
What’s Included, and What Shows Up as an Extra?
Most conversion quotes include demolition, the pan, wall surfaces, a valve, and the drain work. Extras usually show up as glass, tile upgrades, niches, a bench, exhaust fan work, and any drywall or paint outside the shower itself. Ask which of those are excluded before you compare two numbers, because the exclusions are where quotes really diverge.
Two more items are worth pinning down in writing. Who patches the ceiling below if the drain work opens it, and who is responsible for permitting and inspection. Both belong on the short list of questions worth asking a remodeling contractor before anything gets signed.
A bid that looks low is often just a bid that’s narrow. Line the two up item by item and the gap usually explains itself.
When a Conversion Becomes a Full Bathroom Remodel
There’s a point where converting the tub stops being the whole project. If the vanity is dated, if the floor tile is going anyway, if the toilet sits somewhere awkward, doing those jobs separately costs more than doing them together. The floor is already open. The trades are already scheduled.
That math is what pushes some homeowners toward a full bathroom remodel instead of a one-fixture swap. It isn’t always the right call. In a guest bathroom used twice a year, the simple insert wins on every measure that matters.
Where it helps to see the pieces together, the Northbrook showroom on Dundee Road lets you put tile, glass, and surface samples side by side before you commit to a layout. And because the same team designs the bathroom and coordinates the trades that build it, the drain question gets answered on paper rather than on demolition day.
Frequently Asked Questions About Tub-to-Shower Conversion Costs
How much should a tub-to-shower conversion cost?
Plan on roughly $6,000 to $12,000 for an acrylic pan set into the existing footprint, and roughly $15,000 to $30,000 for a tiled shower on a new pan. The middle of that band is where most North Shore projects land once glass and tile choices are settled.
How much does it cost to install a walk-in shower?
A walk-in shower built in an old tub alcove costs about the same as a conversion, because it is one. The price climbs when the opening widens, when a curb is removed for a flush entry, or when the drain has to move to make the entry work.
Can I keep the existing drain location to save money?
Often yes, and it does save money. Keeping the trap where it is avoids the worst of the floor work. You’ll still need the waste outlet sized correctly for a shower, so budget for drain work even when the location doesn’t change.
What makes a conversion quote jump the most?
Opening the floor, then frameless glass, then tile labor. In that order. Anything that pushes the project past the original footprint, like widening the opening or moving a wall, resets the number rather than nudging it.
Want a Number for Your Own Bathroom?
A published range is a starting point, not an estimate. The figure that matters comes from looking at your tub wall, your drain, and what sits under the floor. That’s a half-hour conversation, not a guess, and it’s the fastest way to learn which of the four routes above your bathroom belongs in.
You can book a free design consultation with the Northbrook team, bring your photos and measurements, and leave knowing what your conversion should actually cost.