Last updated: 17 July 2026
If water has started escaping beneath your shower door, the bottom seal may no longer be sealing properly. Over time it can become worn, split, loose or simply stop directing water back into the shower.
Replacing a clip-on shower door bottom seal is usually a straightforward DIY job, as long as you've got the right replacement. This guide walks you through removing the old seal, checking the replacement before fitting it, trimming it to length and installing it correctly.
Before you begin, make sure the replacement matches your glass thickness, the gap below the door and the style of bottom seal already fitted to your shower.
These same checks are useful throughout the process of measuring, fitting and caring for shower seals.
If you haven't chosen a replacement yet, browse our range of shower door bottom seals to find a suitable profile for your shower.
Before You Start
You do not normally need a plumber to replace a clip-on shower door bottom seal. The same basic method also applies to clip-on seals fitted to over-bath shower screens, provided the replacement matches the glass thickness and the gap below the panel.
The fit does matter, however. A loose seal may slip off the glass. A fin that is too long may drag heavily against the tray and make the door difficult to close. If the fin is too short, it may leave a gap underneath the door.
How to Remove the Old Shower Door Bottom Seal
Open the shower door fully so you can get to the bottom edge of the glass.
Start at one end, grip the lower part of the old seal and pull it straight down. Most clip-on bottom seals will come off by hand, so you should not need to remove the door.
If it feels tight, work your way along the seal a little at a time rather than twisting or forcing it. Avoid using a screwdriver, knife or any other sharp tool against the glass.
Once the seal is off, clean away any soap residue, limescale or dirt from the bottom edge of the glass, then leave it clean and dry before trying the replacement.
Check the Replacement Before Fitting
Before fitting the whole seal, press one end onto the glass and check that the U-channel grips securely.
Close the door briefly to see whether the drip fin reaches the tray without dragging heavily. This is also a good time to confirm that the fin is facing into the shower area.
If anything feels too loose or too tight, check the glass thickness and bottom gap again before fitting the full length.
Once everything looks correct, mark the final length and trim the seal before installing it fully.
How to Install a Shower Door Bottom Seal
Once the replacement has been checked and cut to length, make sure the drip fin is facing into the shower area.
Do not try to slide the full seal onto the glass from one end. A correctly sized U-channel is designed to fit tightly, so forcing it sideways can make installation difficult and may put unnecessary strain on the seal.
Start at one end of the glass and position one corner of the U-channel against the bottom edge. Press the seal upwards steadily using the palm of your hand.
As the seal is pressed into place, the edge of the glass will gently ease the U-channel open just enough for it to clip over the glass. This small amount of flex is normal. The rigid PVC is designed to recover its shape and grip the glass securely once fitted.
Continue along the door a little at a time until the full length is installed. Check that the seal sits evenly across the bottom edge of the glass.
Most clip-on shower door bottom seals do not require glue, screws or silicone. The U-channel should hold the seal firmly in place through its natural grip.
Where the bottom seal meets a vertical seal or wall profile, check that the ends meet neatly without leaving an open corner.
Watch our short installation video below to see the fitting method in practice.
Test the New Bottom Seal
Once the seal is fitted, open and close the door several times. It should remain firmly in place without lifting from the glass or dragging heavily against the shower tray.
Run the shower for a few minutes, then check the floor outside the enclosure. Watch where the first signs of water appear rather than directing the shower head straight at the seal, as this does not reflect normal use.
If the New Bottom Seal Still Leaks
If water is still escaping, check the fit of the new seal first.
Is the Seal Fully Seated?
Look along the bottom edge of the glass. The U-channel should sit evenly, with no section higher than the rest.
Does the Fin Reach the Tray?
Close the door and check the contact along its full width. The fin should reach the tray or floor without folding heavily underneath the glass.
A visible gap usually means the fin is too short. Heavy dragging usually means it is too long.
Has the Seal Been Cut Too Short?
Check both ends, particularly where the bottom seal meets a wall profile or vertical seal. Even a small open corner can allow water through.
Is the Water Coming from Somewhere Else?
Dry the area first, then watch where the water appears during normal use. If it starts beside the door or at the corner, the leak may be coming from a vertical seal rather than the new bottom seal.
For a wider check of the enclosure, see our guide to why your shower door is still leaking.
Frequently Asked Questions
Why is my new shower door bottom seal making the door hard to close?
The lower fin may be pressing too firmly against the tray. If the door has to be forced shut, the fin is probably longer than your available bottom gap.
I’ve fitted the seal, but it’s still leaking. What now?
Check the floor level, fin height, and the corners of the door. If the gap below the glass is uneven, the seal may not reach the tray in every position.
A threshold bar may help in some situations, especially where the seal needs a more defined surface to close against.
Do I need to use silicone or glue?
No. For clip-on shower door bottom seals, silicone or glue is usually not required. The seal should grip the glass through the U-shaped channel.
Using adhesive may make future removal more difficult and is not normally needed if the seal is the correct size.
Replacing the Bottom Seal
A correctly fitted bottom seal should stay firmly on the glass, allow the door to move freely and direct water back into the shower without leaving gaps at either end.
If the seal still does not perform as expected, the issue is usually the profile, glass thickness or bottom gap rather than the fitting method itself.
If you are still looking for a replacement, browse our range of shower door bottom seals to compare profiles for different glass thicknesses and bottom gaps.
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