What makes a bathroom cost more than expected?

Hidden conditions. Once tile and the tub come out, subfloor rot, failed waterproofing, and undersized venting are common. That is why a 15 percent contingency is the usual starting point.

Is moving the toilet expensive?

It can be. Relocating a toilet drain often means opening the floor and rerouting the drain and vent, which adds plumbing, structural, and finishing work.

Planning estimate · Q3 2026 pricing

Bathroom renovation

Bathrooms are small but trade-heavy. Waterproofing, ventilation, and plumbing changes drive most of the cost difference between quotes.

Property and size

Location and home age change both cost and how much contingency we recommend.

Where you live

Home type

Approximate home age

Bathroom floor areasq ft

Not sure of the area? Enter length × width

Length (ft)Width (ft)

For irregular rooms, add the rectangles together and enter the total above.

Planning budget

$34,350$28,550–$46,000

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Hidden costs on bathroom projects

These are included as allowances in the estimate above. Check that any contractor quote covers them too.

Waterproofing membranes and niche detailing
Exhaust ventilation ducted to the exterior
Subfloor repair once tile is removed
Plumbing valve and drain replacement
Electrical upgrades for GFCI, heated floors, or fans
Disposal bins and haul-away

Questions homeowners ask

What makes a bathroom cost more than expected?: Hidden conditions. Once tile and the tub come out, subfloor rot, failed waterproofing, and undersized venting are common. That is why a 15 percent contingency is the usual starting point.
Is moving the toilet expensive?: It can be. Relocating a toilet drain often means opening the floor and rerouting the drain and vent, which adds plumbing, structural, and finishing work.

Typical schedule: 2 to 4 weeks on site. See the full renovation timeline.

Property and size

Hidden costs on bathroom projects

Questions homeowners ask

Other calculators

Property and size