Dealing with damp in your Lewisham home, particularly in the SE13 postcode, can be stressful. Understanding whether you’re facing rising damp or condensation is the crucial first step to effective treatment. This guide helps homeowners in Lewisham distinguish between these common problems, understand the typical costs involved, and navigate the repair process.

Types & Options

Rising Damp

Rising damp occurs when moisture from the ground is drawn upwards through porous walls. It usually manifests as a damp patch at ground level, rising up the walls. This often leads to salt efflorescence (white crusty deposits) and persistent dampness.

Condensation

Condensation is caused by excess moisture in the air, which condenses on cold surfaces like walls and windows. It often appears as patches of mould in corners or around window frames, especially in colder months. Improved ventilation usually helps resolve this.

Penetrating Damp

Penetrating damp results from water entering the building fabric through defects in the roof, walls, or windows. This can be caused by leaking pipes, damaged flashing, or inadequate weatherproofing. The damp patch is often irregular and related to the source of the leak.

Costs & Timeline

• Condensation remedies (increased ventilation): £300-£1500, 1–3 weeks.
• Rising damp treatment (chemical injection): £1000-£5000, 4–8 weeks.
• Penetrating damp repair (roof/wall repair): £500-£10,000+, 4–12 weeks (depending on the extent of the damage).
• Basement tanking: £5,000-£20,000+, 8–12 weeks

Costs for damp proofing in Lewisham, SE13, and across the UK vary considerably. Factors influencing the final price include the property’s structure, the chosen materials and specifications, access difficulties (e.g., scaffolding requirements), and whether party wall agreements are needed. Complex projects involving extensive structural work or basement tanking can significantly increase costs.

Safety & Common Mistakes

• Attempting DIY damp proofing without proper knowledge can worsen the problem and damage your property.
• Ignoring mould growth; it can affect your health.
• Using inappropriate or ineffective damp-proofing products.
• Failing to address the underlying cause of dampness.
• See guidance on electrical safety in bathrooms: https://www.niceic.com/

Local Advice (London / UK)

• Many homes in Lewisham, SE13, are Victorian or Edwardian, with solid walls prone to damp issues.
• London’s damp climate necessitates careful consideration of ventilation and damp proofing.
• If your property is semi-detached or terraced, you’ll likely need party wall notices before undertaking significant works.
• Check for parking suspensions and organise permits before scaffolding is erected.
• Scaffolding over bay windows requires specialist expertise.
• Small bathrooms are particularly vulnerable to condensation build-up; ensure adequate ventilation.

Next Steps

1. Book a professional damp survey to determine the cause of the problem.
2. Obtain quotes from several reputable damp-proofing specialists.
3. Check the credentials and insurance of any contractor.
4. Discuss the proposed work in detail, including materials, timelines, and payment terms.
5. Agree on a clear contract before commencing work.
6. Arrange for a final inspection upon completion.

FAQ

How long does damp treatment usually take?

This varies depending on the extent of the damage and the type of treatment required, ranging from a few weeks to several months.

Can I claim for damp problems on my insurance?

It depends on your policy and the cause of the damp. Contact your insurer directly to discuss your specific situation.