Bathroom Renovation Calculator

How to Calculate Materials for a Bathroom Renovation

A bathroom renovation involves multiple materials — tiles, adhesive, grout, waterproofing, and fixtures. Getting the quantities right avoids costly delays and emergency trips to the tile shop. Our bathroom calculator handles all the maths so you can focus on design choices.

Bathroom Tiling Reference

Smaller floor tiles create more grout lines, which improves grip on wet surfaces. This is why 20x20cm remains the standard for bathroom floors, especially in walk-in showers where the floor must slope to a drain.

Materials Breakdown per sqm

These rates are for standard bathroom products. Premium tiles, rapid-set adhesive, and anti-mould grout cost 20-50% more but offer better durability in high-moisture environments.

Fixture Installation Costs

Every bathroom needs fixtures. Whether you install them yourself or hire a bathroom fitter, budget for these:

Waterproofing Requirements

Building regulations require tanking in all wet areas. The minimum waterproofed zone covers the shower floor and walls to 1.8m height. For a full wet room, the entire floor and all walls need tanking.

Apply waterproofing membrane in two coats with 24 hours drying between coats. Overlap joints by 50mm and embed reinforcing tape in the first coat at all internal corners. Once waterproofed, the surface is ready for tiling with flexible adhesive.

Budget Comparison

The biggest cost variable is the fixtures. A budget toilet and basin set costs EUR 200, while a premium wall-hung suite starts at EUR 800. Tiles are the next variable — porcelain at EUR 20/sqm vs natural stone at EUR 80/sqm makes a significant difference on 18+ sqm of tiled surface.

If you are renovating the kitchen at the same time, our kitchen renovation calculator helps you estimate backsplash tiles, cabinet paint, and countertop materials. For the rest of the house, check the paint calculator to estimate wall paint and the tile calculator for other tiling projects.