Mine is 5I flat too. Both toilets are of the same size 230 cm x 140 cm x 270 cm (height). $4,000 is only for laying of wall tiles with selection of homo tiles up to $3 for both toilets. For toilet floor, he charged me $800. So, it is $4,800 for laying tiles for both wall and floor for both toilets excluding hacking etc. Hacking, removal of items etc are charged separately, about $5000 for the whole house. Water proofing is also charge separately, $700 for 2 toilets and kitchen.