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Discovering damp marks low down on a wall can be unsettling. It’s one of those problems that's often noticed gradually: a peeling skirting board, a faint musty smell, or a tide mark that seems to creep higher over time.

Rising damp is less common than condensation or leaks, but when it does occur, it needs proper diagnosis. Acting early usually keeps repairs simpler and prevents unnecessary work.

Is rising damp an emergency?

Rising damp is rarely an emergency in the same way a burst pipe or roof leak is. It usually develops slowly, often over months or even years. However, it does need attention if:

• Damp patches are spreading or getting higher

• Skirting boards or flooring are starting to rot

• There’s a persistent musty smell

• Mould is forming near living areas

• You’re planning to sell or remortgage the property

If damp is affecting structural timber or causing significant mould growth, arrange an inspection sooner rather than later.

What is rising damp?

Rising damp occurs when moisture from the ground travels upward through capillary action (small tubes in your masonry) and spreads through your walls, plaster and paint. It can also affect any woodwork in your home, leading to rot and mould.

In most homes, a damp proof course (DPC) prevents this movement. When that barrier fails, becomes damaged, or is bridged by external ground levels, moisture can enter the wall structure.

Moisture usually rises to a maximum height of around 1 metre to 1.2 metres before gravity limits further movement. That’s why damp marks higher up the wall often point to a different cause, such as condensation or penetrating damp.

What causes rising damp?

The most common causes of rising damp include:

• A damaged or deteriorated damp proof course

• A missing damp proof course in older properties

• External ground levels built too high against the wall

• Debris or soil bridging the damp proof barrier

• Poor drainage causing persistently wet ground

• Changes to flooring or patios that alter moisture movement

• In rare cases, poorly installed cavity wall insulation can contribute to moisture problems

Older homes built before the mid-20th century are more likely to experience rising damp because early damp proof courses were often made from slate or bitumen, which can deteriorate over time.

If damp appears suddenly after building work, landscaping, or installing a new driveway, check whether the external ground level has been raised above the damp proof course level.

How do you tell if it's rising damp or condensation?

Wondering whether your property is suffering from rising damp or condensation is one of the most common questions homeowners ask — the two can easily be confused. Here’s a simple comparison:

Signs of rising damp

• Damp patches low down on walls

• A horizontal 'tide mark'

• White powdery deposits (salts)

• Peeling paint or plaster near the floor

• Rotting skirting boards

Signs of condensation

• Damp or mould on colder surfaces

• Water droplets on windows

• Problems in kitchens, bathrooms, or bedrooms

• Worse in winter or poorly ventilated rooms

• Condensation is far more common than rising damp, and usually easier to fix.

That’s why accurate diagnosis matters before starting any treatment.

Why have I suddenly got rising damp?

In many cases, the damp itself hasn’t suddenly appeared, it’s simply become visible.

Common triggers include:

• Prolonged wet weather saturating soil

• Changes to external ground levels

• Renovation or plaster removal exposing damp areas

• Installing impermeable materials that trap moisture

• Blocked air bricks or drainage issues

It’s also common to notice damp after moving furniture or redecorating, when previously hidden areas become exposed.

Can rising damp go above 1.2 metres?

Rising damp rarely rises higher than about 1 to 1.2 metres because gravity limits how far moisture can travel upward through masonry.

If the damp patches in your home extend significantly higher than this, it’s more likely to be:

• Penetrating damp

• Condensation

• Plumbing leaks

• Poor ventilation

That distinction is important, because the wrong diagnosis can lead to unnecessary work.

Does a damp proof course stop rising damp?

A damp proof course creates a barrier that prevents moisture from travelling upward from the ground into the walls. In other words, it's designed to stop rising damp.

However, it can fail if:

• The material deteriorates with age

• It was installed incorrectly

• External ground levels bridge the barrier (come up over the top of it)

• Structural changes disrupt the wall

In many cases, restoring or repairing the existing system is enough to resolve the issue.

Can rising damp be permanently fixed?

In most cases, rising damp can be permanently fixed as long as the underlying cause is identified correctly.

Permanent solutions may include:

• Repairing or replacing the damp proof course

• Lowering external ground levels

• Improving drainage around the property

• Removing moisture-damaged plaster

• Addressing ventilation or structural issues

The key point: Treatment only works when the cause is confirmed first.

Can you treat rising damp without removing plaster?

You can sometimes treat rising damp without removing plaster, but not always.

Plaster often contains salts left behind by evaporating moisture. These salts can continue to attract water even after the wall has dried.

That’s why treatment may involve:

• Removing contaminated plaster

• Installing a damp proof course

• Replastering with specialist materials

In milder cases, where damage is limited, plaster removal may not be necessary.

Does insurance cover rising damp?

Rising damp isn't usually covered by insurance. Most home insurance policies cover sudden and accidental damage, such as burst pipes or storm damage.

Rising damp typically develops gradually, so it’s often considered a maintenance issue rather than an insurable event.

However, insurance may apply if damp results from:

• Flooding

• Structural damage

• A plumbing failure

If you’re unsure, check your policy wording and take photographs of the affected areas.

Are there health risks associated with damp?

Unfortunately, there are health risks associated with damp, particularly when damp leads to mould growth.

Research shows that millions of people in the UK live in homes affected by damp, mould, or cold conditions, which can contribute to respiratory problems and worsen existing health conditions.

Health risks linked to damp environments include:

• Asthma and respiratory irritation

• Allergies

• Skin irritation

• Reduced indoor air quality

Prevent damp in your home: practical tips you need to know

Damp is a word that homeowners, quite rightly, have come to dread. Damp can cause significant damage to your home and seriously affect the health of all members of your household.

Learn more

How much does rising damp treatment cost?

The cost of treating rising damp depends on the extent of the damage and the treatment needed. As a guide:

• Retrofitting a new damp proof course can cost in the region of £2,500–£7,500

• A damp survey usually costs around £300

Some of the items you might expect to see on a quote for rising damp include:

• Damp proof course installation

• Plaster removal and replacement

• Decorative repairs

• Investigation and survey work

For more detailed pricing information, take a look at our damp proofing cost guide.

What not to do if you suspect rising damp

When it comes to damp, these are some of the most common mistakes made by UK homeowners:

• Repainting over damp patches

• Assuming all damp is rising damp

• Installing chemical treatments without diagnosis

• Ignoring persistent moisture

Short-term fixes can hide symptoms without solving the cause.

Who should you call about rising damp?

If you suspect rising damp, your first port of call should be a damp specialist or surveyor.

Hiring a trained professional takes the guesswork out of the situation. They can:

• Identify the type of damp

• Measure moisture levels

• Inspect the damp proof course

• Recommend appropriate treatment

Rising damp checklist: what to remember

• Check whether damp is limited to the lower part of walls

• Look for tide marks, peeling paint, or salt deposits

• Inspect external ground levels and drainage

• Avoid quick cosmetic fixes

• Arrange a professional inspection if damp persists

• Keep photographs for insurance or survey purposes

Find a damp specialist near you

Persistent damp can affect your home’s structure and decoration — and the sooner the cause is identified, the easier it usually is to resolve.

Before you book, take a quick look at our damp specialist hiring guide. It explains what to check before agreeing to treatment, so you can make confident, informed decisions.

Then, search your postcode to compare checked, reviewed damp specialists near you and request quotes with confidence.

FAQs

What is rising damp?

Rising damp is moisture from the ground moving upward through brickwork and walls through tiny gaps in the materials, allowing water to slowly travel upwards.

What causes rising damp in internal walls?

The most common cause of rising damp in internal walls is a failed or bridged damp proof course, which then allows moisture to enter the wall.

Is it illegal to sell a house with rising damp?

No, it's not illegal to sell a house with rising damp, but sellers must disclose known problems honestly. Failing to do so can lead to legal disputes.

Can rising damp be permanently fixed?

It is possible to permanently fix rising damp, as long as the underlying cause is identified and treated correctly.

Can you treat rising damp without removing plaster?

Sometimes it's possible to treat rising damp without removing plaster, but contaminated plaster often needs replacing to prevent recurring damp.

Can rising damp go above 1.2 m?

Rising damp rarely goes above 1.2 m because gravity limits how far moisture can travel up through masonry. Damp above that level usually indicates another issue.

Does DPC stop rising damp?

Yes, a damp proof course is designed specifically to prevent moisture rising up from the ground and into the structure of your home.

How do you tell if it's rising damp or condensation?

Rising damp affects lower walls, while condensation typically appears on surfaces throughout the room.

Does insurance cover rising damp?

Home insurance won't usually cover rising damp, as it develops gradually rather than being the result of sudden or accidental damage.

Why have I suddenly got rising damp?

Changes in weather, drainage, or building work can make existing damp more noticeable. However, a lot of the time, the damp has been building gradually and it's simply become visible.

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