Backgrounds and Preparation · 4 lessons
Tiling over underfloor heating (and who connects it)
Tiles and underfloor heating go well together, but the job is split. The tiler lays, protects and covers the mat. An electrician connects it.
Our wall and floor tiling path is in public beta: some lessons are still being checked.
What the tiler does
Lay the mat or cable to the maker's plan, keep it from being damaged, cover it in the adhesive or levelling compound the maker names, and record the checks the maker asks for before and after tiling.
What the electrician does
Connecting an electric mat to the supply, its thermostat and its protection is electrical work for an electrician. In England and Wales a new circuit is notifiable under Part P, and so is work in the zones around a bath or shower. The main routes are an electrician registered with a competent person scheme, who notifies the work, or telling building control before the work starts. England also has registered third-party certifiers, and Wales lists more notifiable work than England. Scotland and Northern Ireland have their own building rules.
Why the adhesive matters
A heated floor warms and cools every day, so it moves. Makers usually ask for a flexible (S1) adhesive, movement joints at the edges and across big areas, and a wait before the heating first goes on.
Wet systems
Warm-water underfloor heating runs pipes from a manifold. Fitting and connecting those is heating work for a plumber or heating engineer; the tiler covers the finished screed.
Common mistakes
- Treating connecting the heating mat as part of the tiling job.
- Using a rigid adhesive where the heating maker asks for a flexible one.
- Switching the heating on before the adhesive and grout have cured.
The lessons this guide comes from
- Tanking and wet rooms
- Movement joints
- Uncoupling membranes
- Underfloor heating
Keep learning
- Tiling topics
- Wall and floor tiling: learn the basics
- DIY electrics: what you can do
- IP ratings and bathroom zones
- Deformable adhesive (S1 and S2)
- Movement joint
- Uncoupling membrane
- Tiling practice questions
- Can you tile onto plasterboard?
- Which tile adhesive class?
- Setting out a tiled wall
- Why tiles crack or sound hollow
- Wet rooms and tanking explained
Sources
Sources checked 31 October 2026. Guidance and official pages can change.
- GOV.UK: Approved Document P (electrical safety, England)England's guidance on electrical safety in homes, including which jobs building control must hear about.