Who this guide is for
- Homeowners with a bathroom project involving plumbing
- People relocating a toilet, basin or shower
- Anyone concerned about drainage and waste falls
- Owners comparing plumbers
Match experience to your project
A simple fixture swap is very different from moving a soil pipe or relocating fixtures. Tell the plumber what your project involves and confirm they have done similar work, especially any relocations.
Relocating waste and drainage is more involved than swapping taps.
- Describe what your project involves
- Confirm experience with relocations
- Discuss any waste or drainage changes
- Match the plumber to the complexity
Probe drainage and waste falls
Waste pipes need correct falls to drain reliably, and getting this wrong causes slow drains and smells. Ask how they handle waste runs and falls for your layout.
Drainage falls are a technical detail worth checking.
- Ask how waste falls are handled
- Discuss the drainage layout
- Confirm reliable waste runs
- Raise any awkward pipe routes
Confirm credentials and certification
Plumbing is regulated in many places, so ask to see relevant licensing and insurance for the work. Confirm who certifies any regulated elements of the project.
Do not skip this; it is central to safe, compliant plumbing.
- Ask to see relevant licensing
- Confirm insurance covers the work
- Check who certifies regulated elements
- Keep a record of what you verified
Coordinate with other trades
Bathroom plumbing weaves around tiling, waterproofing and sometimes electrics. Ask how the plumber coordinates with the other trades and the order of work.
Sequencing matters in a small wet room.
Brief and compare on the same scope
Give each plumber the same brief so quotes compare and nothing is assumed. Ask what could change once pipework is exposed.
Keep all regulated work with qualified, insured professionals.
Hiring checklist
- 1Describe what your bathroom project involves
- 2Confirm experience with relocations
- 3Ask how waste falls and drainage are handled
- 4Ask to see relevant licensing and insurance
- 5Confirm who certifies regulated elements
- 6Ask how they coordinate with other trades
- 7Give each plumber the same brief
- 8Ask what could change once pipework is exposed
- 9Keep regulated work with qualified professionals
- 10Keep a record of what you verified
Common mistakes to avoid
- Treating a relocation like a simple fixture swap
- Overlooking waste falls and drainage detail
- Not asking to see licensing for regulated work
- Ignoring coordination with tiling and waterproofing
- Comparing quotes that cover different scopes
- Forgetting to ask what could change once pipes are exposed
When to involve a professional
- Route all plumbing as regulated, safety-critical work to qualified, insured professionals
- Ask to see relevant licensing for the plumbing work
- Confirm who certifies regulated elements
- Coordinate with waterproofing and tiling trades
- Remember plumbing requirements vary by location and project
Frequently asked questions
Questions readers ask about this topic
Is moving a bathroom fixture a big job?
Relocating a toilet, basin or shower is more involved than swapping taps, because it affects supply, waste and drainage falls. Confirm the plumber has done similar relocations, and treat it as regulated, safety-critical work.
Why do drainage falls matter?
Waste pipes need correct falls to drain reliably, and getting this wrong causes slow drains and smells. Ask how the plumber handles waste runs and falls for your layout, especially with any awkward pipe routes.
Should I check licensing?
Yes. Plumbing is regulated in many places, so ask to see relevant licensing and insurance and confirm who certifies regulated elements. Do not skip this, as requirements vary by location and project.
How does plumbing fit with the other trades?
Bathroom plumbing weaves around tiling, waterproofing and sometimes electrics, so sequencing matters in a small wet room. Ask how the plumber coordinates with the other trades and the order of work.
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