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Diagnose damp above DPC.
Penetrating, condensation or hidden plumbing leak — sorted by cause, with a written report.
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Costs, timelines, pitfalls and the right questions to ask before any damp proofer starts on damp Above DPC.
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Misdiagnosed as rising damp
Damp at 800mm or 1.5m height is NOT rising damp — rising damp shows below 1m only. Don't accept rising damp diagnosis above this level.
Damp tracking from elsewhere
Water enters at one point and tracks across rafters or down walls. Find the entry point, not just visible internal damp.
Cavity leaks
Burst pipes in cavity hard to find. Inspector should use moisture mapping or thermal imaging.
Window seal failure
Old wooden windows or perished uPVC seals let water track in. Often confused with rising damp because it appears at window-sill level.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Damp survey + cause identificationPCA-qualified
£120–£400
Pipe leak repairLocate + fix + drying
£180–£800
Roof or flashing repairPlus access
£200–£1.5k
Window seal replacementPer window
£120–£400
Pointing repair externalAffected area
£80–£500
Internal plaster + redecorationPer area
£200–£800
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Damp Proofer explained
Damp showing above the DPC level is rarely rising damp — usually condensation, leak, or penetrating damp from above. Expect to pay £80–£2,500 for diagnosis and treatment depending on the true cause.
What Does the Work Invovle?
Diagnosis is the key step. Look UP from the damp patch to identify the source: water stain often originates at upper edge, then tracks down. Possible causes: leaking pipe in cavity, leaking roof/flashing, blocked gutter, perished window seal, perished pointing, defective flashing at extension roof junction, internal condensation, kitchen/bathroom moisture migration.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Damp survey + cause identification | 120 | 400 | PCA-qualified |
| Pipe leak repair | 180 | 800 | Locate + fix + drying |
| Roof or flashing repair | 200 | 1,500 | Plus access |
| Window seal replacement | 120 | 400 | Per window |
| Pointing repair external | 80 | 500 | Affected area |
| Internal plaster + redecoration | 200 | 800 | Per area |
| Whole-house diagnosis treatment | 500 | 2,500 | Multiple causes |
How Long Does It Take?
Diagnosis: 1–2 hours. Single-source repair: 1–2 days. Drying after repair: 4–8 weeks. Re-plaster and decorate after.
DIY or Professional?
Diagnosis: PCA-qualified surveyor. Specific repairs by relevant trade — plumber, roofer, glazier.
Choosing the Right Tradesperson
Independent PCA-qualified surveyor first. Then specialist trades for each fix. Co-ordinated approach saves time and cost.
UK Regulations
No specific Building Regs for diagnosis. Repairs to roof, pointing, gutters may trigger Building Regs depending on scope.
Common Problems
- Misdiagnosed as rising damp: Damp at 800mm or 1.5m height is NOT rising damp — rising damp shows below 1m only. Don't accept rising damp diagnosis above this level.
- Damp tracking from elsewhere: Water enters at one point and tracks across rafters or down walls. Find the entry point, not just visible internal damp.
- Cavity leaks: Burst pipes in cavity hard to find. Inspector should use moisture mapping or thermal imaging.
- Window seal failure: Old wooden windows or perished uPVC seals let water track in. Often confused with rising damp because it appears at window-sill level.
Frequently Asked Questions
Is damp above DPC ever rising damp?
Rising damp can reach 1m maximum theoretically. Above that, it's something else — usually penetrating damp, leak, or condensation.
How do I find the source of damp above DPC?
Track UP from the visible damp patch. External inspection: pointing, render, gutters, roof tiles, flashings. Internal: pipes, kitchen/bathroom adjacent walls.
Will chemical DPC fix damp above DPC?
No — chemical DPC is for rising damp only (below 1m). For damp higher up, useless. If a contractor recommends it for damp at 1.5m, get a second opinion.
Damp around window — what's wrong?
Usually perished window frame seal, defective pointing around the frame, or cracked sill. Fix at the source, not just internal plaster.
Should I get thermal imaging survey?
For elusive damp sources: yes — thermal imaging shows temperature differences indicating water. Costs £200–£700 for a survey.
How long for repairs and drying?
Source fix: typically 1–2 days. Drying: 4–8 weeks. Re-plaster: 1–2 days after drying. Total: 6–10 weeks before redecoration.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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