What actually changes the price: whether fixtures move, tanking scope, tile choice and fittings — and how to spot what is missing from a quote.
A bathroom is the most expensive room per square metre in any property, and the reason is density rather than luxury.
Demolition, drainage, plumbing, electrical, waterproofing, screeding, tiling, joinery, glass and fittings all happen in a space of a few square metres. Ten trades in a room the size of a parking bay.
That is why a small bathroom costs what it does, and why the single decision that moves the price most is not the tile.
Tanking and the flood test should appear as their own lines. If they do not, you cannot tell whether they are included.
This is the single most useful thing to check on a bathroom quotation. Waterproofing is invisible in the finished room, it adds cost, and it is the easiest line to leave out of a price while still producing a bathroom that looks finished on handover day.
Beyond that, a bathroom quote should name the sanitaryware and brassware by product, state the tile by name and size, identify who supplies what, and list the exclusions.
Sanitaryware supply is worth settling explicitly. Some contractors include a provisional allowance, some expect you to supply. Both are normal. What causes problems is a quote where it is ambiguous.
If the drainage is being altered, usually yes. If it is a fixture swap, usually not.
In an apartment, altering drainage normally needs building management approval, and depending on the tower a modification permit may apply. Buildings take bathroom work seriously because the risk sits with the unit below, and some require a refundable deposit before contractors start.
A like-for-like refurbishment within the existing wet area is a lighter path, though the building still applies its normal rules on access, working hours and waste removal.
In a villa, a bathroom refurbishment within existing walls is usually straightforward. Adding a bathroom moves it into the building permit route.
Per bathroom, from a survey, with each element listed separately. What to ask for:
Curing and testing set the pace, not the number of people on site.
Tanking cures, then the flood test is held, then screed cures, then tiling, then grout cures before use. These are fixed periods and adding labour does not shorten them. It is why a bathroom takes longer than its size suggests.
Material lead times are the other factor. Specific tiles, sanitaryware and made-to-measure glass can take time to arrive, so selections should be locked before strip-out begins rather than during.
Tanking and the flood test should appear as their own lines. If they do not, you cannot tell whether they are included.
Tell us the property and whether the layout is staying. We will check the drainage, floor depth and water pressure on site, and quote with tanking, testing and each fitting listed separately.