EZ Able® Resource Guide
ADA Roll-In vs. Transfer Shower: How to Choose
Quick answer
A roll-in shower is at least 30 x 60 inches INSIDE with a wide, nearly flat entry so a shower wheelchair rolls straight in; a transfer shower is 36 x 36 inches inside with a seat for someone who slides over from a wheelchair. Pick roll-in if the user stays in a chair, transfer if they can safely move to a seat, and choose the unit before the old tub comes out.
If you're planning an accessible bathroom, the first fork in the road is simple: will the person using this shower roll in on a shower wheelchair, or move onto a seat? Get that right and the size, entry and seat choices mostly fall into place.
We've been helping homeowners, contractors and facility managers sort this out since 2008. Here's the plain-language version of what the 2010 ADA Standards say, how prefab units fit, and the one measuring mistake we see most often.
The quick answer
- Roll-in shower: the user stays in a shower wheelchair and rolls in. Needs a big inside footprint (30 x 60 inches minimum) and a nearly flat entry.
- Transfer shower: the user pulls up alongside and slides onto a seat. Smaller inside footprint (36 x 36 inches), and the seat and grab bars do the heavy lifting.
One thing up front: in a private home, the ADA Standards are not required. They apply to public accommodations and commercial facilities. At home they're simply the best-tested set of numbers we have, and plenty of families use them as a target. If you're buying for a business, clinic or other public building, follow them to the letter.
Inside vs. outside: the mistake to avoid
The ADA Standards measure a shower's INSIDE dimensions, at the center points of opposing sides. Most builders, and most product names, use OUTSIDE dimensions. A base sold as "60 x 30" is 60 x 30 on the outside, so the floor you actually stand or sit on is smaller once the walls and flanges are in.
That's why we tell everyone: choose your shower before you remove the tub. Once you know the exact unit, its spec sheet gives you the outside size to frame for and the inside size you'll end up with. If an ADA roll-in is the goal, a typical 60 x 30 tub alcove usually won't give you 30 x 60 inches inside, and you'll want to plan a slightly bigger space before demolition starts.
What the 2010 ADA Standards require
References are to the 2010 ADA Standards for Accessible Design: 608 (shower compartments), 609 (grab bars) and 610 (seats). All shower sizes are inside dimensions.
Transfer-type shower (608.2.1)
- Inside: 36 x 36 inches.
- Entry: 36 inches wide minimum.
- Clear floor space outside: 36 inches wide by 48 inches long minimum.
- A seat is required (608.4), on the wall opposite the controls.
- Controls and hand shower: 38 to 48 inches above the shower floor (608.5.1).
Standard roll-in shower (608.2.2)
- Inside: 30 inches wide by 60 inches deep minimum.
- Entry: the full 60-inch side is open.
- Clear floor space outside: 30 x 60 inches minimum next to the open face.
- Controls: 48 inches max above the shower floor (608.5.2).
Alternate roll-in shower (608.2.3)
- Inside: 36 x 60 inches minimum.
- Entry: 36 inches wide minimum, on the long side at one end.
Rules for every type
- Threshold (608.7): 1/2 inch high maximum, beveled. Exception: a transfer shower in an existing building may go up to 2 inches where a lower threshold would disturb the floor slab's structural reinforcement.
- Hand shower (608.6): hose 59 inches long minimum.
- Grab bars (609): top of the gripping surface 33 to 36 inches above the floor, 1-1/2 inches from the wall, rated for 250 pounds. Our ADA Grab Bar Guide covers placement wall by wall.
- Seats (610): top of seat 17 to 19 inches above the floor, rated for 250 pounds. See wall-mounted shower seats.
Side-by-side comparison
| Type | Inside size (min) | Entry | Threshold max (ADA) | Seat | Best for |
|---|---|---|---|---|---|
| Transfer | 36" x 36" | 36" wide | 1/2" (2" in some existing buildings) | Required | Users who can slide from a wheelchair to a seat; small bathrooms |
| Standard roll-in | 30" x 60" | Full 60" side | 1/2" | Optional folding seat | Users who stay in a shower wheelchair; a helper needs room |
| Alternate roll-in | 36" x 60" | 36" on the long side | 1/2" | Optional folding seat | Roll-in access where the whole front can't be open |
How to decide: four questions we ask every customer
- How does the user get in today?
If they can stand, pivot and sit with a grab bar, a transfer shower is usually enough and fits more bathrooms. If they need to stay in a chair, or a caregiver will help, go roll-in. The extra length gives a helper somewhere to stand.
- What size is the unit, inside and out?
Pick the model first, then frame to its outside size. Measure the finished wall-to-wall space, not the old tub, and remember the clear floor space outside the shower counts too. Measure your narrowest doorway and hallway as well; a curbless unit may also need a taller bathroom door, a door wide enough for a helper or walking aid, and a door that doesn't add its own step.
- How will the entry meet the bathroom floor?
Our prefab showers and bases sit on the unfinished subfloor. No recessing, no cutting joists. The entry ends up close to flush because of the finished floor you put down afterward: most tile floors, with thinset and underlayment, come out around 3/4 inch thick, so a 3/4-inch threshold usually lands close to level with the finished tile. Under the ADA, the 1/2-inch limit is measured against that finished floor. The full method is in How to Install a Curbless Shower Without Recessing the Subfloor.
- Where does the water go?
- Center drain: simplest plumbing, common on transfer units.
- Trench (linear) drain: runs along the entry so water stays in with no curb; a good fit for roll-ins.
- End drain (left or right): handy when you're reusing a tub drain location.
For keeping splash inside an open entry, see Curbless Shower: Will Water Get Out? and the collapsible shower dam.
Prefab vs. tile-in-place
A tiled roll-in can look great, but it depends on an installer hitting precise slopes. A prefab fiberglass or acrylic unit arrives with the slope and wall reinforcement built in, so what's on the spec sheet is what you get. Our Prefab Showers buying guide goes deeper on the trade-offs.
A few examples, with specs from each product page:
- 40 x 40 ADA shower stall with seat and center drain: 36 x 36 inside, folding seat, 3/4-inch beveled threshold, 3-piece.
- 40 x 38 roll-in shower base with trench drain (Best Bath): front trench drain, threshold options from 3/4 inch to 2 inches.
- 62 x 38 multi-piece shower, Quick Ship: 62.625 x 38.25 inches outside, 5-piece, 3/4-inch threshold, center drain.
Current "starts at" prices are on each product page; final price depends on size, drain, finish and accessories. If you need strict ADA compliance for an inspection, confirm the inside dimensions and the threshold-to-finished-floor height with us before ordering.
Shop by type: ADA showers · ADA shower pans · curbless showers · walk-in shower kits · tub-to-shower conversion kits
Single-piece or multi-piece?
A single-piece unit has no seams but has to fit through every doorway between the truck and the bathroom, so it's usually new construction. Multi-piece units (3 to 5 pieces) come apart to fit through a standard door and are the go-to for remodels.
What to expect on delivery
- Lead time: many ADA units ship in about 5 business days; some take around 15. The product page lists it.
- Freight: delivery is by truck to the end of the driveway, and the road needs to handle a semi. If you don't have a dock or a crew to unload, add a liftgate at checkout (available for an added fee).
- Inspect before you sign: note any damage on the bill of lading, and report shipping damage within 2 days with photos.
- Returns: prefab showers and shower pans are Made-Upon-Order and can't be returned, which is why we push hard on choosing and measuring first.
Frequently Asked Questions
Click a question below to expand the answer.
Does a roll-in shower have to be 60 inches long?
Under the 2010 ADA Standards, yes, and that's measured inside. A standard roll-in needs at least 30 x 60 inches inside with the full 60-inch side open; an alternate roll-in needs 36 x 60 inside with a 36-inch entry. Smaller curbless showers work well in many homes, where ADA isn't required, but they aren't ADA roll-ins.
What's the maximum threshold for an ADA shower?
1/2 inch, beveled, for roll-in and transfer showers (608.7), measured against the finished floor. A transfer shower in an existing building may go to 2 inches if a lower threshold would disturb the slab's reinforcement. Since most tile floors finish around 3/4 inch thick, a prefab base with a 3/4-inch threshold set on the subfloor usually ends up close to flush.
Can I put an ADA shower where my bathtub is?
Often, but choose the shower before the tub comes out. ADA sizes are inside dimensions, while tubs and most shower bases are sold by outside size, so a typical 60 x 30 tub alcove usually won't give you 30 x 60 inches inside. Pick the unit, check its spec sheet for both sizes, then plan the framing. In a private home ADA isn't required, so a curbless unit that fits the alcove may be all you need.
Do I have to recess the floor for a low-threshold shower?
No. Our prefab showers and bases sit on the unfinished subfloor. The finished floor installed afterward, usually tile at about 3/4 inch with its setting materials, brings the bathroom floor up close to the shower's entry. Measure the whole finished floor build-up and match it to the threshold height on the spec sheet.
Do I need a seat in an ADA shower?
In a transfer shower, yes: the 2010 Standards require one on the wall opposite the controls, 17 to 19 inches high. In a roll-in, a folding seat is optional but handy. On our installed curbless and roll-in units, a wall-mounted seat can be added directly to the shower wall without additional backing.
Does Medicare pay for an accessible shower?
No. Medicare doesn't cover home modifications like accessible showers, even when a doctor recommends one. Some families use VA benefits, state waiver programs or local grants instead, and it's worth asking your local area agency on aging what's available. Our Home Accessibility Funding & Grants guide lists where to start.
Next Steps: Need Help Choosing?
Not sure which one fits? Send us the room measurements, your narrowest doorway and a photo, or call 877-392-2531. We'll tell you straight which units fit, inside and out.
Facts reviewed by the EZ Able team. Dimensions from the 2010 ADA Standards for Accessible Design and the manufacturer spec sheets on each product page.
Posted by Jody Fisk, President of EZ Able®. Licensed Michigan residential builder since 1991, helping builders and homeowners get accessible showers right.
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