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Re-plaster with salt-resistant plaster.
After damp treatment — gypsum strip out, salt-resistant render coat and skim. Stops salts re-blooming.
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Costs, timelines, pitfalls and the right questions to ask before any damp proofer starts on salt-Resistant Re-Plastering.
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Itemised quotes from up to 3 local damp proofers on salt-Resistant Re-Plastering — so you can compare like-for-like, not lump sums.
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Four moves that separate a smooth job from a nightmare.
Standard plaster reused
Cheap quotes skip salt-resistant render. Damp returns within months as salts re-emerge.
Inadequate removal
Plaster not removed high enough above DPC. Salts in upper plaster track down to new lower plaster.
Premature decoration
Painting before plaster fully dry causes peeling. Allow 2–3 weeks minimum.
Mortar joints contaminated
Salts also in old mortar. Quality work re-points where heavily contaminated.
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
Salt-resistant render per m²Limelite, Sika
£50–£120/m²
Standard finish coat per m²Multi-finish over base
£15–£35/m²
Existing plaster removal per m²Hack off to brick
£15–£30/m²
Single wall (10 m²) full systemStandard work
£500–£1.5k
Skirting board replacement per metreMDF or hardwood
£15–£40
Salt-neutralising primer per m²Sika or similar
£5–£15/m²
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Damp Proofer explained
Damp affected plaster has absorbed salts (sodium chloride, calcium nitrate) that hold moisture and re-emerge through any new plaster. Salt-resistant render is essential after damp treatment. Expect to pay £50–£120 per m² for UK salt-resistant re-plastering.
What Does the Work Involve?
Existing salt-contaminated plaster removed to bare brick — typically up to 1m above the affected DPC line. Brick swept clean. Salt-neutralising primer applied (Sika Sit Neutraliser or similar). Salt-resistant render base coat (Limelite Easy Coat, Sika MonoTop) applied 8–15mm thick. Then standard finish coat. Plaster takes 2–3 weeks to dry. Skirting boards replaced.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Salt-resistant render per m² | 50 | 120 | Limelite, Sika |
| Standard finish coat per m² | 15 | 35 | Multi-finish over base |
| Existing plaster removal per m² | 15 | 30 | Hack off to brick |
| Single wall (10 m²) full system | 500 | 1,500 | Standard work |
| Skirting board replacement per metre | 15 | 40 | MDF or hardwood |
| Salt-neutralising primer per m² | 5 | 15 | Sika or similar |
| Whole-house replaster after damp | 2,500 | 8,500 | 1m height all affected walls |
How Long Does It Take?
Single wall salt-resistant replaster: 1–2 days. Drying: 2–3 weeks before painting. Whole-house phase: 1–2 weeks plus drying.
DIY or Professional?
Professional plasterer with experience of salt-resistant products. Render takes specific skill — wrong mix consistency causes cracking.
Choosing the Right Tradesperson
PCA-affiliated plasterer or specialist contractor. Confirm product brand — Limelite Easy Coat, Sika MonoTop are the UK leaders. Insist on full system (neutraliser + render + finish), not just finish coat.
UK Regulations
PCA Code of Practice for damp remediation. Listed buildings need consent.
Common Problems
- Standard plaster reused: Cheap quotes skip salt-resistant render. Damp returns within months as salts re-emerge.
- Inadequate removal: Plaster not removed high enough above DPC. Salts in upper plaster track down to new lower plaster.
- Premature decoration: Painting before plaster fully dry causes peeling. Allow 2–3 weeks minimum.
- Mortar joints contaminated: Salts also in old mortar. Quality work re-points where heavily contaminated.
Frequently Asked Questions
Why do I need salt-resistant plaster?
Damp pulls salts from brick into surrounding plaster. Those salts absorb moisture from the air, holding it in. Without salt-resistant replaster, the new plaster blooms with white deposits and stays damp.
What's Limelite?
Limelite Easy Coat is a UK-popular renovation render specifically designed for salt-laden walls. Two-coat system over salt-contaminated brick after damp treatment.
How long does salt-resistant plaster last?
Indefinitely if applied correctly over treated substrate. Decades of use proven.
Can I use lime plaster instead?
Yes — traditional lime plaster on heritage buildings. Naturally breathable, suits solid walls. Slower to apply, requires experienced lime plasterer.
How high should the replaster be?
At least 1m above the DPC line, or 30cm above the highest visible damp tide mark — whichever is higher.
Why does new plaster bloom with white?
Efflorescence — salts emerging through plaster. Indicates salt-resistant system was skipped or salt-contaminated substrate not addressed. Re-do.
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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