Find the right starting point

Start with your symptom

You do not need to know the cause of the damp to find a useful guide. Choose what you can see, or explore the main subjects below.

Not sure where water is entering? Try the Leak Finder →

Water on ceilings or in the loft

Why is water coming through the ceiling below the bathroom? Why is a ceiling stain far from the roof leak? Why is my loft wet after rain? Why is water coming through a ceiling near a light?

Damp after heavy rain

Why does damp appear after heavy rain? Why does my roof leak only in heavy rain? Why is one side of my house damp after storms? Why does my gutter overflow in heavy rain?

Damp around windows and doors

Why is water getting in around my windows? Why are your windows wet every morning? Why does damp form beneath a window? Why is water coming under my external door?

Damp low down on walls

Damp at the bottom of a wall: what could cause it? Can outside paving bridge your damp-proof course? Why is water pooling against my house? Can salt contamination mimic rising damp?

Bathroom and plumbing moisture

Can a shower leak without water on the floor? Why is my ceiling damp below the bath? Why is water appearing around the base of my toilet? How can you tell if a pipe is leaking inside a wall?

Mould and condensation

Why is black mould growing in your bedroom? Why does mould return after cleaning? Why is mould worst behind wardrobes? Why are your windows wet every morning?

Concerned about a proposed treatment

Is a chemical damp-proof course worth the money? Can a damp meter tell you where the water came from? Should you get a second opinion on damp? How to compare damp proofing quotes?

Browse by type of problem

Roof leaks Plumbing and bathroom leaks Gutters, drainage and rainwater Walls, windows and doors Flat roofs and extensions Condensation and mould Rising damp and DPCs Surveys, treatments and costs