The cost of a bathroom refurbishment depends mainly on the floor area, the quality of the materials and the scope of the plumbing and electrical work. A small bathroom undergoing a partial refurbishment costs considerably less than a complete renovation involving the re-routing of pipes.
The most common mistake is to plan the budget based solely on materials, without taking labour and unforeseen costs into account. It is good practice to set aside a contingency of 10–15% and to obtain a quote following an on-site inspection, rather than over the phone.