Bathroom Renovation Cost Calculator
Estimate a bathroom remodel from its area, finish quality and the number of fixtures.
Recent
Formula
How the calculation works
The base cost is the bathroom area times a rate per square foot, scaled by the quality multiplier.
Fixtures are charged per unit on top, because taps, showers and sanitaryware do not scale with floor area.
Adding the two gives the total, and the quality multiplier is the lever that moves it most.
Common mistakes
- Forgetting waterproofing and plumbing work, which a bathroom needs more than any other room.
- Buying premium fixtures while keeping basic tiling, which can look mismatched for little saving.
When to use it
- Use it to compare a quick refresh against a full renovation before deciding.
- It is not a quote; plumbing condition often adds cost this estimate cannot see.
Worked example
A 40 sq ft bathroom on standard quality with 4 fixtures costs 224,000 plus 60,000, a total of 284,000.
Common questions
Why is a small bathroom still costly?
Plumbing and waterproofing are fixed costs, so a small room does not shrink them much.
What counts as a fixture?
A fixture is a toilet, basin, shower or bathtub, each counted at 15,000.
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