What is the best way to plug the drain after the bathroom is converted into a cloakroom?

Do not seal the drain, press it on the mouth with broken tiles, and then smooth it with sand and plaster, and then build on it. It's good to change it back in case you change it back in the future.

If you have not yet laid the floor tiles, it is best to seal it with a special cover of the water hose before doing the ground work.

First, deal with the waterproof problem of the top surface.

Second, do the best exhaust system for the location of the exhaust outlet, because there are more dark guards now, and there will be a possibility of humidity if it is changed to the cloakroom, so as an exhaust, it is done together with the light line, so that when the light is turned on, you can enter the exhaust treatment, and at the same time do some reverse air blockage, it is best to do it on both the air outlet and the exhaust fan, so that the exhaust may be a little small, but it can also prevent the odor outside.

Thirdly, I recommend that all kinds of water pipes be done well, closed with wire plugs, and the sewer pipes should be closed with rubber and other items, because it is not certain whether the room should always be arranged like this, so it is good to properly retain the originality for future changes. Fourth, and then it is to make cabinets as required.