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What to Check Before a Bathroom Renovation

Click through each step to see the order in which to handle it.

  1. Check waterproofing quality first

    Waterproofing is the single most important part of a bathroom renovation. Confirm whether the contractor is applying a new layer over the existing waterproofing or fully removing and redoing it, and ask whether a flood test β€” filling the floor with water to check for leaks β€” will be performed afterward.

  2. Check the drain slope and pipe positions

    Confirm that the floor slopes correctly toward the drain so water flows freely, and check whether moving the sink or toilet pipe positions from where they were could cause leaks into the unit below.

  3. Check the ventilation fan's performance

    Given how humid a bathroom gets, the exhaust fan's capacity and how well its duct connects to the outside largely determine whether mold becomes a problem. Confirm whether the existing fan will be reused or replaced, and that the duct actually vents outdoors.

  4. Check the tile and grout grade and installation method

    Find out whether the tile is a dense, low-water-absorption porcelain type, and whether the grout is a mold-resistant epoxy or a standard cement-based grout β€” this makes a major difference in how much upkeep the bathroom will need afterward.

  5. Check whether fixtures can be relocated

    Moving a toilet or sink often requires raising the floor or rerouting pipes underneath it, which can significantly affect both cost and scope. Clarify upfront whether relocation is part of the plan and what it will add to the budget.

A bathroom renovation is 80% about waterproofing

A bathroom uses more water than almost any other room, so poor waterproofing can lead to leaks into the unit below and disputes with neighbors. Focus your attention less on visible finishes like tile and faucets, and more on the waterproofing and drainage work you cannot see once it is covered up.

Learn basic upkeep for the finished bathroom

Once your renovation is done, learning simple maintenance skills like resealing silicone caulk around joints will help you keep the space in good condition and catch small water-damage issues before they grow into expensive problems.

Frequently Asked Questions

Should I always insist on a flood test?

A flood test is the most reliable way to confirm waterproofing was done correctly. It involves filling the floor with water for a set period and checking the ceiling and walls of the unit below for leaks β€” it is worth asking your contractor to perform one before you sign off.

Is it better to layer new waterproofing over the old, or remove everything and start fresh?

If the existing waterproof layer is in good condition, layering over it can save cost and time. But if there is a history of leaks or the layer is clearly worn out, a full removal and redo is the safer long-term choice.