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Leveling your walk-in tub: why every leg must touch the floor before anything else

Updated September 2026

▶Glossary7
  1. See Leveling Done During a Real Installation
  2. How to Level the Tub, Step by Step
  3. Why Leveling Legs Matter
  4. If the Door Rubs the Frame or Jamb
  5. Why This Is a Warranty Item
  6. If Your Door Is Already Leaking
  7. Common Questions

Leveling a walk-in tub is the number one thing that prevents door leaks, and it is the first thing to verify on any new install or any tub that has started leaking at the door. Every leveling leg must touch the floor and carry equal weight, with no gap under any leg. On the inward-swing acrylic family (Standard, Standard60, Zen, Zen60, Flow) and the HomeCare, the front legs must also be screwed into the subfloor. An unlevel tub slowly warps the frame and shell, the door falls out of alignment, the seal leaks, and misleveling voids the warranty, so this step deserves real care.

See Leveling Done During a Real Installation

This Big4One installation shows why the sequence matters: panels and aprons come off before the tub enters the home, and once inside, the tub must be properly leveled before anything is connected. Ella tubs have adjustable leveling legs so the tub can be leveled and set correctly on the actual floor. Without proper leveling, the tub door may not function properly and may leak.

How to Level the Tub, Step by Step

  1. Start with the subfloor. It must be level and rated to support the tub, the water, and the bather. Fix subfloor problems before setting the tub. The tub can sit on the subfloor before tile or on the finished floor; see slabs, condos, and upper floors for special cases.
  2. Set the tub in place and check every side with a level. Check length and width on the deck, not just one edge.
  3. Test each leg with a slip of paper. Try to slide a piece of paper under each leveling leg. If the paper slides under, that leg is not carrying weight. Adjust until every foot is securely on the ground.
  4. Tighten all legs firmly. On the Standard, Zen, and Flow platform there must be no gap between the floor and the leveling legs, and the front legs must be screwed into the subfloor.
  5. Verify the door. The door must close smoothly into a watertight seal. If you see uneven gaps between the door and frame, adjust the legs until the gaps close evenly. Proper leveling assures proper door alignment, and proper door alignment is critical to a leak-proof seal.
  6. Re-verify after connections. The tub is leveled at the factory, but the installer must re-verify leveling on site, and again after plumbing and electrical work is complete, then run the pre-installation water test.
Close-up of the watertight door seal and aluminum frame corner on an Ella Ultra walk-in tub
A level frame lets the door meet the seal evenly all the way around. Uneven gaps mean a leg is not carrying weight.

Why Leveling Legs Matter

In this short clip the narrator explains that many Ella tubs have up to eight adjustable leveling legs to disperse the weight evenly, and that those legs are critical to the proper functioning of the tub. Check that each foot is securely on the floor; if one is not, the door will not seal and may leak. Adjust each leg and check level on all sides for proper door alignment and closure. Ella tubs have at least six leveling legs, including center legs on many models, which spread the weight, reduce subfloor movement and frame twist, and protect the silicone seams.

If the Door Rubs the Frame or Jamb

A door that rubs or scrapes the jamb usually means the tub is bowed down in the middle because the center leg is not carrying weight. The video shows the fix: raise the tub from the center by extending the center leveling leg so the door frame opens up and clears the jamb, then re-check every leg and measure all sides again. Our door rubs the frame article walks through it in detail.

Why This Is a Warranty Item

What happens when a tub is unlevelResult
Frame and shell warp over timeDoor misalignment
Door misalignmentDoor leaks
Misleveled installationWarranty void

The warranty activation form your installer signs includes an initialed line confirming the tub is level with all legs touching, plus a watertight door check after a 20 minute fill. Completing those two checks honestly on install day prevents nearly all door leak calls. Misleveling is one of the items listed in what voids your warranty.

If Your Door Is Already Leaking

Re-check leveling first, following the steps above, and adjust the legs until the door closes smoothly into a watertight seal. Most door leaks resolve right there, with no parts needed. Then clean the seal and frame as described in door seal cleaning and care. If a properly leveled tub still leaks at the door, see water at the door: what to check or call (800) 480-6850 and we will help diagnose the seal and alignment.

Common Questions

How many leveling legs does my tub have?
Every Ella tub has at least six adjustable leveling legs, and many models have up to eight, including center legs that spread the weight and reduce frame twist. Every one of them must sit solidly on the floor and carry weight, with no gap under any leg. The slip of paper test is the quickest way to confirm this: if the paper slides under a foot, that leg needs adjusting.
Can the legs be raised another 2 inches?
No. The leveling legs stop at their limit screw, and they should not be extended beyond it. If you need the tub higher or lower than the leg range allows, talk with your installer and the team at (800) 480-6850 before changing the floor, so the right approach can be confirmed for your model. Have the model and the height you are trying to reach ready when you call.
Why does the door sag when someone steps in even though the corners read level?
The corners can read level while the legs nearest the door are not actually touching the floor, so the weight of the water and the bather sags the frame at the door. Run the paper test on every leg, not just the corners, and adjust each one until it carries weight. Once every foot is firmly on the floor, the door should close smoothly into an even, watertight seal.
Why does my door rub or scrape the jamb?
A door that rubs or scrapes the jamb usually means the tub is bowed down in the middle because the center leveling leg is not carrying weight. Extend the center leg to raise the tub from the middle, which opens up the door frame so it clears the jamb, then re-check every leg and measure level on all sides again. Our door rubs the frame article walks through the fix in detail.
Do the front legs really have to be screwed to the subfloor?
On the Standard, Standard60, Zen, Zen60, Flow, and HomeCare, yes. On that platform there must be no gap between the floor and the leveling legs, all legs are tightened firmly, and the front legs are screwed into the subfloor to keep the frame from shifting. Other door families rely on the adjustable legs alone, but every leg still has to sit solidly on the floor.
Does an unlevel installation affect the warranty?
Yes. An unlevel tub slowly warps the frame and shell, the door falls out of alignment and leaks, and misleveling voids the warranty. The warranty activation form your installer signs includes an initialed line confirming the tub is level with all legs touching, plus a watertight door check after a 20 minute fill. Completing those checks honestly on install day prevents nearly all door leak calls.
Should I level again after the plumbing and electrical are connected?
Yes. The tub is leveled at the factory, but plumbing and electrical work can shift it slightly, so the installer must re-verify leveling on site and again after all connections are complete. Re-check every leg and confirm that the door closes smoothly into a watertight seal, then run the pre-installation water test before the walls are finished.
Can the tub sit on tile, or does it have to be on the subfloor?
Either works as long as the floor is level and rated to support the tub, the water, and the bather. Most installers set the tub on the subfloor before tile, but a finished tile floor is fine too. Any subfloor problems should be corrected before the tub is set, and our article on slabs, condos, and upper floors covers the special cases.

Still need help? Open a ticket at ellasbubbles.com/support or call (800) 480-6850 and our team will be glad to walk you or your installer through it.

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