Why is pre-installation planning so important for a walk-in tub?

Pre-installation planning matters on a walk-in tub because the decisions that are hardest to undo, the route into the house, the drain height, the electrical circuits and the wall finish, are all made before the tub is ever filled. Every Ella walk-in tub arrives factory tested and factory leveled, and installation is performed by your own licensed local contractor, so the plan you make together decides whether the tub fits through the doorway, passes its leak test while the walls are still open, and keeps its warranty intact. The items to gather are listed in What you need before installing your Ella walk-in tub: a planning checklist, and this page explains why each one is worth settling before delivery day.

The Tub Has to Fit the Route, Not Just the Alcove

Fit is the first reason to plan, and it has two parts. The alcove is measured against the actual dimensions, which are slightly smaller than the nominal size on the product page. The Petite, for example, is listed as 28 x 52 while its actual width is 27.5 inches. The route is measured against the shipping crate size, because the tub travels through your hallways and doorways in its crate, and a corner the crate cannot turn is discovered on delivery day if nobody measured it earlier. Ella strongly suggests filling the tub outside before it is carried in, so the plan also needs a flat spot and a hose where that test can happen, and all panels come off before the tub is moved.

Outward-swing doors add a third measurement. The Ella HomeCare assisted-bathing tub is the clearest example: its 27 inch aluminum door swings a full 180 degrees so a caregiver can transfer the bather from a wheelchair, and its documentation gives a clearance envelope of 103 3/4 inches for that swing. That floor space has to exist in the finished bathroom, with the vanity and the toilet in place, not just on the drawing. The HomeCare also shows how far planning can reach on a specialty tub: its wall-mount faucet is not included and is purchased and installed separately, and its 80 gallon tank measures 28 1/2 by 44 1/2 inches and 17 inches deep, so both the plumbing and the footprint are settled before anything ships.

The Water Test Only Works While Everything Is Still Reachable

Every Ella walk-in tub gets a required one hour check before the walls are closed up, described in What Is the Pre-Installation Water Test on a Walk-In Tub?. The installer places the tub on a flat, level surface, wipes the door seal, tapes the drains shut and fills the tub to 3 inches above the highest jet, or to the bottom of the grab bar on a soaking tub with no jets. The water stands for 30 minutes while the installer looks around and under the tub for moisture. Then each electrical component runs on its own rated 3-prong cord, plugged into separate outlets, for another 30 minutes while every union is inspected again with the pumps moving water.

The reason this belongs in the plan is timing. Shipping vibration can loosen unions and air lines, and a drip at a union during the test is a normal install-stage adjustment: the union was over-tightened or its O-ring shifted, and the fix is to take it apart, re-seat the O-ring and reassemble it snugly. That is simple work with the apron off and the tub in the open. The same drip found after the tile is grouted means opening a finished wall. Two more details depend on sequencing. An unlevel tub can leak at the door during the test, so leveling with the paper test under each foot comes first, and pumps never start before water covers all jets, because running a pump dry causes permanent damage that is not covered. The test then flows into warranty activation, where your installer confirms a watertight door seal after a 20 minute fill and watertight connections with the pumps running.

Plumbing and Electrical Decisions Set the Height and the Circuits

The installation checklist asks for a licensed electrician, an experienced plumber or contractor, one or more dedicated GFCI protected circuits, a sound and level subfloor rated for the tub plus water plus bather, a working house drain, and service access to the plumbing and electrical after the walls are finished. Each of those is a decision with a lead-in. The electrician needs to know how many components the tub has before pulling circuits, since the water test runs each one from a separate outlet. The plumber needs 3/4 inch supply lines for the fast-fill faucet, connected without over-torquing, and a 2 inch house drain is recommended for the dual drain system.

Height is the decision owners most often wish they had made earlier. Ella tubs leave the factory with the frame and threshold preset so the 2 inch drain piping runs under the tub and above the floor, with approximately 3 inches of clearance for it. That is why a tub can go onto a concrete slab or an upper floor without opening the floor, and it is the installation the warranty and the manuals assume. The tub can be lowered by putting the drain below the subfloor and cutting the bottom of the apron or end panel, which brings the threshold to as low as 3.5 inches, but the warranty does not cover the parts that are cut or altered. Lowering the Tub: Below-Subfloor Drains, 3 Inch Thresholds, and What It Does to the Warranty lays out the trade-off. Deciding this on paper, before the subfloor is opened or an apron is cut, is the whole point of planning.

Wall Finishing Comes Last, and the Flange Is Not in the Crate

Ella tubs have a flat deck edge with no built-in lip, so a tile flange is added at installation to let the wall tile or panels overlap the tub edge and shed water back into the tub. No Ella tub ships with one, by design, and the flange kit travels separately by parcel carrier rather than in the crate, so it is requested with your tub model through where you purchased the tub or the team at (800) 480-6850 and should not be reported missing on delivery day. Ella's Flexible Glue-Up Tile Flange kit is a 124 inch strip of 4 inch wide flexible membrane with a 1 1/4 inch adhesive strip, and longer strips are listed for larger models such as the Big4One, TransferXXL, LayDown72, Escape and Big4Two. Any 1/8 inch or 3/16 inch rust-proof, waterproof strip about 5 inches tall, glued with 100 percent silicone and overlapping the tub edge by about 2 inches, does the same job. What Is a Tile Flange on a Walk-In Tub? covers the kit and the one exception, the ShaK, which is not designed to be tiled in directly.

Wall finishing should only begin after the water test and the leveling check, because fixing a leak behind finished tile is far more disruptive than fixing it in the open. The extension panel video on this page shows the other wall-side item worth planning: the fill kit, an extension panel behind the tub that the installer cuts to whatever the walls are, supported by adjustable stainless steel brackets that are an extension of the frame, so the shelf never depends on silicone alone. Knowing in advance that the panel will be cut to the room means the alcove does not have to be built to the tub's exact length.

What a Good Plan Looks Like

1. Measure every doorway, hallway and turn against the crate size, and the alcove against the actual size on the spec sheet.
2. Line up a licensed electrician and an experienced plumber, and confirm the circuits, the house drain location and where service access will be.
3. Decide the threshold height with your installer, knowing that a recessed installation voids coverage on any part that is cut.
4. Fill the tub outside, then level it, let the door gasket recover, and connect the supply lines and drains.
5. Run the full one hour water test with every component on its own outlet, and fix any union drip before the apron goes back on.
6. Fit the flange, finish the walls, caulk every joint with silicone, and complete warranty activation with your installer.

Ella's technical support team guides installers for free by phone, email and live video, and a plan that is worked out ahead of time is the easiest kind to support.

Watch: Walk-In Tub Extension Panels for Seamless Installation - Voted Best/Safest 2020 | Ella’s Bubbles with chapters and a full transcript.

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