Removal of wet room to create large living room

Presumably you are putting it back to its original form and if so, you will simply need to make sure all electrical and mechanical services ar safely removed and make good

Hi all your are thinking about sounds good. Also consider levelling of floor if its a proper wet room removal of tray former etc.

The electrical services need terminating at source, likely to be in the distribution board but could also be in the existing ring main for the ground floor. The mechanical/plumbing runs need to be removed completely back to original build so as not to leave "dead legs." The floor drain needs to be sealed up in the manhole it runs into, not just blocked off in the floor and filled over. After this, the non loadbearing walls and fixtures and fittings can simply be stripped out, and the base build walls/ceiling/floor made good ready for new coverings and decorations. No change of use building notice would've been sought at the time of conversion, so you need not seek it now to change this back.

Make sure all electrical and plumbing completely removed. Also make sure all drainage and waste Pipes removed Or capped properly to ensure you don’t have any problems with pests