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.

How Much Does a Bathroom Renovation Cost?

Bathroom renovation costs vary dramatically depending on the scope of work, materials chosen, and whether you hire professionals. This section breaks down every cost element so you can set a realistic budget before you start.

Cost Breakdown by Element

These figures are for a standard 6 sqm bathroom (3m x 2m) with half-wall tiling. Larger bathrooms, en-suites, or wet rooms will cost proportionally more. Use the calculator above to get exact material quantities for your specific dimensions.

Labour Cost Breakdown

DIY vs Professional Cost Comparison

DIY saves significantly on a bathroom renovation, but only if you are confident with waterproofing and tiling. Poor waterproofing can cause thousands in water damage. If you are new to tiling, consider doing the painting and finishing yourself while hiring a professional for waterproofing and tiling.

Hidden Costs Checklist

Budget an extra 15-25% for these commonly overlooked expenses:

Ways to Save on a Bathroom Renovation

The cheapest way to refresh a bathroom is to avoid retiling: reglaze the existing bath or shower, paint the walls above the tile line, replace tired silicone and grout, and swap in new fixtures (taps, towel rail, mirror) for EUR 200-500. Keeping plumbing in its existing position avoids EUR 200-600 in relocation costs, and half-wall tiling with painted walls above costs 40-60% less than full-height tiling. Where you do tile, choosing porcelain at EUR 20/sqm over natural stone at EUR 80/sqm is the single biggest material saving across 18+ sqm of surface.

Planning a kitchen renovation alongside your bathroom? The kitchen renovation calculator provides similar detailed cost breakdowns. If you only need to repaint the rooms around the bathroom, try the paint calculator.

How does this compare across Europe?

We combined this calculator's national-average baseline with Eurostat's 2024 hourly construction labour cost data to publish the European Bathroom Renovation Cost Index 2026 — a country-by-country comparison across 18 EU member states. The full dataset (free CSV under CC BY 4.0) shows how labour-cost differences translate into total cost: the same mid-range bathroom that costs €5,390 in Copenhagen costs €2,937 in Bucharest, a 1.84× spread driven almost entirely by labour. Materials prices barely move across the EU single market.