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Evidence-based UK property advice

Damp, Mould & Condensation: Clear Advice for UK Homes

Understand what's causing moisture problems in your property, explore possible solutions and make informed decisions about treatment and costs.

Identify Your Damp Problem Explore Our Guides

Free interactive tools · British English · Sources cited · No diagnosis from a photo

Illustration of a British terraced street with brick houses under a soft sky

Start here

What problem are you dealing with?

Pick the symptom that best matches what you are seeing. Each links to a focused topic hub.

Damp tide mark with salt staining and bubbling paint at the base of an interior wall above the skirting board

Rising Damp

What rising damp actually is, how it is diagnosed, how it is treated and why it is frequently misdiagnosed.

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Dark damp patch spreading across exterior brickwork beneath a leaking gutter and downpipe

Penetrating Damp

Moisture entering through walls, roofs and openings — causes, signs, repairs and typical costs.

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Black spot mould growing in the cold corner of a room where the ceiling meets two walls

Black Mould

Why mould grows indoors, how to remove it safely and the evidence on health effects.

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Heavy condensation and water droplets running down the inside of a double-glazed window on a cold morning

Condensation

The most common cause of damp and mould in UK homes — why it happens and how to control it.

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Large irregular damp patch with discoloured plaster and peeling paint on an interior wall

Damp Walls

Understand the different kinds of damp found in UK homes, how to recognise them and what to do next.

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Brown water-stain ring spreading across a white interior ceiling from a leak above

Damp Ceilings

Understand the different kinds of damp found in UK homes, how to recognise them and what to do next.

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Interactive tool

Not sure what you're dealing with?

Our Damp Diagnosis Assistant asks a short series of questions and uses a transparent, rule-based engine to suggest the most likely causes — and, importantly, the alternatives worth ruling out.

It is a structured starting point, not a professional diagnosis. For extensive or recurring problems, get an independent survey.

Start the diagnosis
  • ?Where is the problem, and is it near ground level?
  • ?Does it get worse after rain, or on cold mornings?
  • ?Is there mould on cold surfaces or behind furniture?
  • ?How old is the property, and is the wall external?

Editorial picks

Featured guides

Damp

What Is Damp? A Complete Guide for UK Homes

Damp is a catch-all term for unwanted moisture in a building. The three main types in UK homes behave differently — and the right fix depends entirely on which one you have.

Damp

The Different Types of Damp Explained

A side-by-side comparison of the three main types of damp, the signs of each, and a practical process for identifying which one you have.

Updated 18 October 2026 · 2 min read

Rising Damp

What Is Rising Damp? A Balanced Guide

Rising damp is groundwater moving up through the base of a wall. It is a genuine phenomenon, but far rarer than the number of diagnoses suggests.

Updated 18 October 2026 · 3 min read

Damp treatment estimate
Indicative low
from a few hundred £
Indicative high
several £1,000s

Live figures are produced by the calculator from editable, dated assumptions. These are estimates, not quotations.

Budget with confidence

Damp Treatment Cost Calculator

Build an indicative low–high budget based on the work involved, affected area and region, using transparent UK pricing assumptions you can see and adjust.

Open the calculator

The essentials

Understanding the three types of damp

Most UK damp problems are one of these three — and each needs a completely different fix.

Condensation diagram

Condensation

Warm, moist air meeting cold surfaces. The most common cause of household damp and mould.

Learn more →
Penetrating damp diagram

Penetrating damp

Water getting in from outside through a defect such as a leaking gutter or cracked render.

Learn more →
Rising damp diagram

Rising damp

Groundwater rising through the base of a wall. Genuine, but frequently over-diagnosed.

Learn more →

Fresh from the team

Latest advice

Mould

How to Remove Mould Safely (and Stop It Returning)

Removing mould is straightforward if you work safely. But cleaning is only half the job — the mould will return unless you also fix the moisture feeding it.

Updated 27 October 2026 · 3 min read

Mould

How to Prevent Mould in Your Home

Mould needs a damp surface to grow. Control moisture, ventilate well and keep surfaces warm enough, and you remove the conditions it depends on.

Updated 27 October 2026 · 3 min read

For homeowners

Diagnose the cause, understand your treatment options and get a realistic sense of costs before you call anyone out.

For tenants

Know your rights, document the problem properly and report damp and mould to your landlord with confidence.

How we research our guides

We aim to be genuinely useful and honest about the limits of online advice.

Read our editorial policy

  • Sourced from trusted bodies

    We cite GOV.UK, the NHS, Citizens Advice and recognised building-science guidance, with dates and jurisdictions.

  • Honest about uncertainty

    We flag where a professional survey is needed and never diagnose a problem from a photograph.

  • No fabricated expertise

    We only label content “expert reviewed” when a named, qualified reviewer has checked it.

  • Clear on money

    Costs are indicative estimates with stated assumptions — never presented as independently surveyed quotations.