Damp Proofing Specialists in Lewisham (SE13, SE6)
Professional damp proofing specialists in Lewisham, South East London.
Why Choose All Well for Damp Proofing in Lewisham?
Lewisham's Victorian terraces are prone to damp — particularly the ground-floor properties in lower-lying areas near the Quaggy and Ravensbourne rivers. Rising damp from failed damp-proof courses is the most common issue, but we also see penetrating damp from cracked pointing and condensation in poorly ventilated kitchens and bathrooms. We diagnose the cause before treating the symptoms, because a DPC injection won't fix penetrating damp and a ventilation fan won't fix rising damp. Get the diagnosis right and the treatment works.
Every project comes with a fixed-price contract, single project manager, and full certification including Building Control sign-off.
Damp Proofing for Lewisham Properties
Lewisham is known for its victorian terraces, edwardian semis, ex-council estates. Our damp proofing services are tailored to these property types, ensuring results that complement the character of your home.
Postcodes we cover: SE13, SE6
Damp Proofing Tip for Lewisham Homeowners
Properties near the river corridors in Lewisham can have higher groundwater levels that make rising damp more persistent. In these cases, a standard chemical DPC may need supplementing with improved land drainage around the base of the external walls to lower the water table locally. We assess the external ground conditions as well as the internal walls — sometimes the fix is outside the house, not inside it. Lewisham Building Control doesn't require notification for damp proofing work, but we provide documentation for your records and future property sales.
Three damp problems we treat in Lewisham
Three damp issues account for most of what we treat in SE13 and SE6. Rising damp on Victorian terraces in lower-lying SE13 streets is the most common. Properties near the Quaggy or Ravensbourne river corridors have higher persistent groundwater than properties on the higher ground around Brockley and Telegraph Hill, which makes rising damp more aggressive when the original slate damp-proof course (typical of pre-1920 Victorian terraces) fails. Treatment is chemical DPC injection (silicone-based cream into the mortar course) followed by replastering with salt-resistant render after a 4-6 week drying period. Cost £2,500-£5,500 including replastering. 20-year transferable guarantee. Penetrating damp from cracked pointing or failing render is the second pattern. Common on the older Victorian terraces around Lewisham High Street and the streets towards Ladywell. Treatment depends on the cause: re-pointing with a sand-cement mix matched to the original, cutting out and replacing failing render, or replacing blocked or broken cast-iron downpipes. Cost £400-£2,500 depending on cause and area affected. Condensation in poorly ventilated bathrooms and kitchens is the third common issue. Common in Lewisham conversion flats where original ventilation has been blocked up during previous renovations. Treatment is positive-input ventilation (PIV) systems or improved extractor fans. PIV cost £750-£1,400 fitted. Condensation problems clear within weeks of installation.
River corridors and supplementary drainage
Lewisham's river corridors create a Lewisham-specific damp pattern that needs different treatment than standard rising damp. Properties within 100-200 metres of the Quaggy, Ravensbourne, or Pool River have higher persistent groundwater levels than properties on higher ground. This affects damp treatment in two ways. First, standard chemical DPC injection may not be enough on its own. The persistent moisture pressure from below ground keeps trying to push moisture up through the wall, even after a new chemical DPC is in place. In these cases, we supplement the chemical DPC with improved external drainage — typically a French drain installed along the base of the external wall to redirect surface water away from the foundations and lower the water table locally. Cost is typically £1,500-£3,500 for the external drainage work. Second, the assessment needs to be wider than just the affected internal walls. We inspect external ground conditions, gutter and downpipe condition, and any retaining walls or boundary features that might be channelling water towards the property. Sometimes the fix is entirely outside the house — clearing a blocked downpipe, repointing a section of cracked render, or rebuilding a failing retaining wall. We don't inject DPC if the actual problem is something else. For properties in Flood Zone 2 or 3 (mostly within 200-300 metres of the river corridors), the Environment Agency's flood risk maps confirm the zone designation. Flood-affected properties may benefit from flood resilience measures during the damp work — raised electrical sockets, flood barriers at door and air-brick openings, water-resistant floor materials. We advise on these as part of the survey.
Diagnosis-first approach and project documentation
Diagnosis comes first. The survey includes calibrated moisture meter readings (Protimeter or Tramex) on every affected wall, external inspection of gutters, downpipes, render, pointing, and ground levels, and assessment of internal ventilation. Each type of damp has a different signature, and treating the wrong cause wastes money. For rising damp, the classic tide mark is horizontal at about a metre above floor level, with salt deposits, peeling paper, and crumbling plaster. For penetrating damp, the wet patches are localised and can appear at any height. For condensation, black mould forms on cold walls, especially in bathrooms and kitchens. Chemical DPC injection follows the established Code of Practice for diagnosis of rising damp and installation of chemical damp-proof courses. We use silicone-based DPC creams from BSI-approved suppliers. Injection holes are 12mm diameter at 100-120mm centres, drilled into the mortar course at the appropriate height (typically 150mm above ground level externally, or 75mm above floor level internally). Replastering uses salt-resistant render applied to the affected wall after the 4-6 week drying period. We schedule a return visit to check moisture levels with the calibrated meter before applying the final plaster coat. Rushing the replaster causes the same problem to return within 6-12 months. Lewisham Building Control doesn't require notification for damp proofing work, but we provide documentation for your records — the project sign-off paperwork is useful for future property sales when solicitors enquire about damp treatments. All DPC work is guaranteed for 20 years and the guarantee is transferable to subsequent owners. We carry CHAS certification, Public Liability insurance to £5 million.
Damp Proofing in Lewisham: What's Included
Damp Proofing Pricing in Lewisham
£1,500 – £8,000
1–2 weeks | Fixed-price contracts | No hidden costs
What Our Customers Say
“All Well managed our project from start to finish. The fixed-price contract meant no surprises, and the result is stunning.”
Verified Customer
Lewisham
“Professional team, clear communication throughout. They handled everything including Building Control sign-off.”
Verified Customer
Lewisham
Frequently Asked Questions
- Why is damp common in lower-lying Lewisham properties?
- Two reasons. First, geography — properties near the Quaggy, Ravensbourne, or Pool River corridors have higher persistent groundwater levels than properties on higher ground around Brockley or Telegraph Hill. This makes rising damp more aggressive when the original slate damp-proof course fails. Second, age — most Victorian terraces in SE13 and SE6 are over 100 years old and the original DPC has typically failed at scale. Standard chemical DPC injection plus replastering is the typical fix, sometimes supplemented with improved external drainage on river-corridor properties.
- How long does damp-proofing take in Lewisham?
- The DPC injection itself is one to two days for most ground-floor jobs. After injection, the wall needs 4-6 weeks to dry out before replastering. The replastering takes one to two days, and the new plaster needs 4-6 more weeks to fully cure before decoration. Total elapsed time from start to redecorated wall is usually 10-14 weeks. We can compress this if the deadline is tight, but rushing the drying creates problems that show up six months later.
- Do I need a Flood Risk Assessment for damp work?
- Damp-proofing work itself doesn't trigger a Flood Risk Assessment — those are required for new extensions and substantial alterations rather than internal damp treatment. However, properties in Flood Zone 2 or 3 (within 200-300 metres of the Quaggy, Ravensbourne, or Pool River corridors) may benefit from flood resilience measures during the damp work. We advise on these at the survey. The Environment Agency's flood risk maps confirm the zone designation for any property.
- Why hire All Well for Lewisham damp-proofing?
- Three reasons. First, the Lewisham specifics: we know the river-corridor effects on rising damp, the typical Victorian terrace substrates, and when supplementary external drainage is needed. Second, diagnosis-first approach: we don't quote a treatment without confirming the cause with calibrated moisture meters and external inspection. Third, fixed-price contracts and a 20-year transferable DPC guarantee. We carry CHAS certification, Public Liability insurance to £5 million, and 57 verified Google reviews averaging 4.5/5.
Damp Proofing Near Lewisham
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