Who this guide is for
- Homeowners planning a full bathroom remodel
- People who want one contractor to manage all the trades
- Anyone concerned about leaks, damp or ventilation
- Owners comparing contractors on bathroom-specific experience
Check bathroom-specific experience
A contractor who builds great kitchens is not automatically a great bathroom contractor. Ask specifically about bathrooms they have remodelled and how those have held up, focusing on the wet-room detailing.
Look for evidence they understand the unique demands of a wet, small space.
- Ask specifically about past bathroom remodels
- Focus on wet-room detailing
- Confirm how those bathrooms have held up
- Match experience to your scope
Probe waterproofing and ventilation
These are the two areas that cause the most hidden, expensive problems. Ask how they approach waterproofing wet areas and how they ensure the room ventilates to manage moisture.
Vague answers here are a strong reason to keep looking.
- Ask how they waterproof wet areas
- Ask how they handle ventilation and moisture
- Treat vague answers as a warning
- Confirm who certifies regulated parts
Coordinate plumbing, electrics and tiling
A bathroom remodel needs careful sequencing — first fix, waterproofing, tiling, second fix. Ask how the contractor coordinates these trades and who is on the team.
Confirm who is responsible if one trade's work affects another.
Compare on the same detailed scope
Bathroom quotes vary widely because scopes differ. Give each contractor the same brief — layout, fixtures, finishes, ventilation — so you compare like with like and understand what is included.
Ask what could change once the existing room is opened up.
Confirm credentials and responsibility
Ask to see relevant qualifications and insurance for the plumbing and electrical work, and confirm who certifies regulated elements. Establish clearly who stands behind the finished room.
Keep a record of what you verified.
- Ask to see relevant qualifications and insurance
- Confirm who certifies regulated work
- Establish who stands behind the room
- Keep a record of what you verified
Hiring checklist
- 1Decide the layout, fixtures and finishes first
- 2Give each contractor the same detailed brief
- 3Ask specifically about past bathroom remodels
- 4Probe waterproofing and ventilation approaches
- 5Ask how plumbing, electrics and tiling are coordinated
- 6Confirm who is on the team
- 7Ask what could change once work starts
- 8Ask to see relevant qualifications and insurance
- 9Confirm who certifies regulated work
- 10Keep a record of what you verified
Common mistakes to avoid
- Assuming general remodelling skill covers wet-room demands
- Skipping questions about waterproofing and ventilation
- Comparing quotes that cover different scopes
- Not asking how trades are sequenced and coordinated
- Ignoring credentials for plumbing and electrical work
- Forgetting to ask what hidden problems could change the job
When to involve a professional
- Route waterproofing, plumbing, electrical and ventilation work to qualified, insured professionals
- Ask to see relevant qualifications for regulated trades
- Confirm who certifies regulated work and stands behind the room
- Ask how ventilation is handled to avoid moisture problems
- Remember bathroom remodel requirements vary by location and project
Frequently asked questions
Questions readers ask about this topic
Is a bathroom remodel different from other remodels?
Yes — a bathroom packs waterproofing, ventilation, plumbing, electrics and tiling into a small wet space, so it needs specific experience. Ask about past bathrooms and how they have held up, not just general remodelling work.
What should I ask about waterproofing?
Ask how the contractor waterproofs wet areas and ensures the room ventilates to manage moisture, since these cause the most hidden, expensive problems. Vague answers are a strong reason to keep looking.
Why do bathroom quotes vary so much?
Because scopes differ — fixtures, finishes, ventilation and what is included. Give each contractor the same detailed brief so you compare like with like, and ask what could change once the existing room is opened up.
Should I check qualifications?
Yes. Ask to see relevant qualifications and insurance for the plumbing and electrical work, and confirm who certifies regulated elements. Requirements for regulated work vary by location and project.
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