Home improvement
Bathroom Remodel Cost Calculator
Works bathroom remodel cost, where moving the plumbing is the decision that matters.
Result
Bathrooms are the most expensive rooms per square foot because of plumbing, waterproofing and tiling. Moving plumbing locations adds significantly. Keeping the layout is the single biggest saving available.
Get a Free Business AuditHow the calculation works
Fixtures and finishes, plus plumbing and electrical work, plus tiling and waterproofing, plus labour and permits. The single largest variable is whether fixtures stay in their existing positions, since relocating a drain in particular involves opening the floor and altering the waste pipework.
What moves the number
- Whether fixtures are relocated or stay in place.
- Drain relocation, which is the most involved change.
- Waterproofing and substrate preparation.
- What is found once the existing finishes come off.
Where this one goes wrong
Moving a toilet or a shower drain is a different project from replacing fixtures in place, because waste pipework needs fall and the floor has to be opened to achieve it, and that single decision can change the cost of a bathroom substantially. Decide early. Water damage behind existing tiling is the other common discovery, and a bathroom opened up frequently reveals rot or failed waterproofing that has to be remedied before anything new goes in.
Before you quote
- Decide early whether fixtures move or stay in place.
- Allow a contingency for damage found behind existing finishes.
- Confirm waterproofing is specified, not assumed.
Where the rules come from
Questions
About this calculator
What drives bathroom remodel cost most?
Whether fixtures stay in place. Moving a toilet or shower drain means opening the floor and altering waste pipework to achieve fall, which is a different project from replacing fixtures where they are and costs accordingly.
What gets discovered in a bathroom?
Water damage behind tiling and around fixtures, frequently. A bathroom opened up reveals rot or failed waterproofing that has to be remedied before anything new goes in, which is why a contingency matters more here than in most rooms.
Is waterproofing part of tiling?
A separate layer and a separate specification, and tile alone is not a waterproof assembly. A wet area without proper waterproofing behind the tile fails eventually, and it is the item most worth confirming is specified.
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How to use this calculator
- Bathroom area (sq ft) (sq ft). Enter your own figure; the page starts at 60 sq ft.
- Low-end cost per sq ft ($). Enter your own figure; the page starts at $180.
- High-end cost per sq ft ($). Enter your own figure; the page starts at $420.
- Fixtures, vanity and fittings ($). Enter your own figure; the page starts at $4,500.
- Contingency (%). Enter your own figure; the page starts at 12%.
The result updates as you type, so you can try a figure, see what it does to likely cost, and change it back. Nothing you enter is sent anywhere or saved.
A worked example
These are the figures the calculator opens with. Every number in the results column below is produced by the same calculation the page runs, so you can follow it through before putting your own figures in.
What goes in
| Input | Value |
|---|---|
| Bathroom area (sq ft) | 60 sq ft |
| Low-end cost per sq ft | $180 |
| High-end cost per sq ft | $420 |
| Fixtures, vanity and fittings | $4,500 |
| Contingency | 12% |
What comes out
| Result | Value |
|---|---|
| Likely cost main result | $25,200 |
| Low estimate | $17,136 |
| High estimate | $33,264 |
| All-in cost per sq ft | $420.00 |
Expect roughly $25,200: a range of $17,136 to $33,264 including contingency, or about $420.00 per square foot.
How sensitive the answer is
Holding everything else steady and changing only low-end cost per sq ft, this is what happens to likely cost. It is worth knowing which of your inputs the answer actually hinges on, and which barely move it.
| Low-end cost per sq ft ($) | Likely cost |
|---|---|
| $90 | $22,176 |
| $135 | $23,688 |
| $180 example above | $25,200 |
| $270 | $28,224 |
| $360 | $31,248 |
Every other input is held at the example value while this one changes, which is not how a real job behaves. Treat it as a guide to which number matters most, not as five separate quotes.
What each figure means
- Bathroom area (sq ft) (sq ft)
- Measured in sq ft, starting at 60 sq ft.
- Low-end cost per sq ft ($)
- A money amount, starting at $180.
- High-end cost per sq ft ($)
- A money amount, starting at $420.
- Fixtures, vanity and fittings ($)
- A money amount, starting at $4,500.
- Contingency (%)
- A percentage, between 0 and 50, starting at 12%.
What the results tell you
| Result | What it is |
|---|---|
| Likely cost | The headline result. A money figure. |
| Low estimate | A money figure. |
| High estimate | A money figure. |
| All-in cost per sq ft | A money figure. |
Keep going
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