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Built in toilet

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18 Nov 2025
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We have an insanely wobbly toilet seat but no idea how to get under the toilet through the unit to tighten it up. Anyone any ideas where the access point is?
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Yeah got the seat off but can't tighten without getting underneath the toilet
 
Some of these back to wall toilets had seat fixing screws that expanded the fixing below as you screwed from the top. You will need to remove the decorative caps to see the screw heads and should then be ablr to tighten the screws.
Be aware, though, that other fixings were standard type, with nuts below that were held to allow the screws to be tightened before the toilet was installed. You MIGHT be able to tighten these back up by screwing from the top, but the nuts below may just rotate. In that case you may have to remove the fixings entirely and install new expanding ones.
 
If there are no bolts / wing nuts visible behind the pan, its likely to be a top fixing seat. If so:
1. Remove the seat, and the stainless steel covers of the fixings.
2. The fixings should have screws in them. These screw into some form of expanding nut.
3. Pull up on the screw heads while tigtening them. This should give enough grip to enable the screw to expand the nut.
4. Whn not quite fully tight, try the seat on again and move the fixings into a position which enables the seat to be refitted.
5. Give the screws a final tighten and replace seat.
 
These would work:


Andy
 
Gotcha so I can't botch job with the existing ones?

You can try!
Pull the fixing up as you tighten it down to the pan.
It relies on that sliding bar to contact the nut and hold it trapped whilst the bolt screws down through it.

When the fixing is very near to the pan, there should be enough of a grip on it to fully tighten.
 

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