Damp Proofing in Northamptonshire
Across the Midlands we see a real mix of solid-wall Victorian terraces prone to rising and penetrating damp, and newer estate housing where condensation and cold-spot mould are the more common issue.
Damp flagged on a mortgage valuation or buyer's survey in Northamptonshire is one of the most common reasons people call us — we can provide an independent written report and a fixed quote, which is often what's needed to keep a sale moving.
Across Northamptonshire we handle everything from rising damp treatment and penetrating damp treatment to condensation and mould control, installing a fresh damp-proof course and salt-resistant damp-proof re-plastering afterwards. Where damp has reached skirtings or joists we add woodworm and timber treatment, and for wet cellars we offer basement waterproofing — every job starting with a proper damp survey so the cause is diagnosed before any work begins.
Towns & areas we cover in Northamptonshire
Damp Proofing Price Guide
Indicative pricing — every job gets a fixed, written quote after a survey. No hidden extras.
Damp survey & report
diagnosis
Free
Free for straightforward jobs; a detailed independent survey report is available for mortgage or purchase cases.
DPC injection (per wall)
rising damp
from £350
Chemical damp-proof course injection to a single affected wall — priced by length and access.
Damp-proof re-plaster
per room
from £600
Salt-resistant re-plastering after treatment, so the wall can be redecorated cleanly.
Basement / cellar tanking
waterproofing
from £1500
Structural waterproofing (tanking or cavity membrane) — quoted per project after survey.
Damp services we offer across Northamptonshire
Rising Damp Treatment
Tide marks, salt staining and blown plaster on ground-floor walls treated at the source
Damp-Proof Course (DPC) Injection
Installing a new chemical damp-proof course where the original has failed
Penetrating Damp Treatment
Damp patches at any height caused by water getting in from outside
Condensation & Mould Control
Black mould in corners and around windows fixed with the right ventilation
Basement & Cellar Tanking
Structural waterproofing to turn a damp cellar into dry, usable space
Damp-Proof Re-Plastering
Salt-resistant re-plastering after treatment, so walls redecorate cleanly
Damp proofing in Northamptonshire — frequently asked questions
How and when do I pay?
Larger jobs are typically arranged with a deposit to book the work and the balance on completion. Full payment terms are set out in your written quote before anything starts — nothing to pay just for a survey and quote.
Do I have to move out during the work?
Rarely. Most damp proofing is done room by room while you stay in the property. For larger basement waterproofing projects we’ll talk through access and timing at survey stage.
How do I book a survey?
Send your postcode and a short description (photos of the affected area help) by phone, email or the contact form, and we’ll arrange a survey and come back with a fixed written quote.
How much does damp proofing cost in Northamptonshire?
Most single-wall damp-proof course treatments in Northamptonshire start from around £350, with a full room including salt-resistant re-plastering nearer £600–£1,200 depending on size and access. We always confirm a fixed price in writing after a survey — no hidden extras.
How do I know if I have rising damp or condensation?
They're often confused. Rising damp shows as a tide mark up to about a metre on ground-floor walls, sometimes with salt staining; condensation shows as black mould in corners, around windows and in poorly ventilated rooms. A survey confirms which it is — the treatment is completely different, so getting the diagnosis right first matters.
Damp is treated by cause, not by symptom: rising, penetrating and condensation damp look similar but need completely different treatments, which is why every job starts with a proper survey and diagnosis before any work is quoted.
Book a free damp survey in Northamptonshire
Tell us about the damp and your postcode — we'll arrange a survey and a fixed written quote.