Damp Proofing in Hillingdon
Damp doesn't get easier to live with the longer it's left, so if there's a tide mark, blown plaster or spreading mould at a property in Hillingdon, we'll survey it, tell you honestly what's causing it and fix it — one of many jobs we handle regularly across Greater London.
Quick answer
Damp proofing in Hillingdon starts with a free survey to diagnose whether it's rising, penetrating or condensation damp, followed by a fixed written quote. Most single-wall treatments start from around £350, with the work carried out at the source and backed by a written guarantee.
How does damp proofing work in Hillingdon?
Across London we deal with a lot of older terraced and Victorian housing where original damp-proof courses have failed or been bridged by raised ground and pavement levels, alongside condensation problems in converted flats with limited ventilation.
Where damp in Hillingdon has reached skirtings, joists or floor timbers, we treat the timber decay or woodworm at the same time as the moisture source, so the whole problem is dealt with in one plan rather than piecemeal.
Every job in Hillingdon starts with a survey and a fixed written price before any work begins — get in touch through the contact form with your postcode and a short description. You can see indicative costs on our price guide or read the full how it works steps.
Damp services available in Hillingdon
Whether it's rising damp treatment on a ground-floor wall, penetrating damp treatment where water is getting in from outside, or condensation and mould control in a poorly ventilated room, every job in Hillingdon starts with a proper damp survey to confirm the cause. From there we install a new damp-proof course where needed, follow up with damp-proof re-plastering, and deal with any woodworm and timber treatment or basement waterproofing the property needs.
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.
Common damp problems we treat in Hillingdon
Rising damp
Tide marks and salt staining up to about a metre on ground-floor walls.
Penetrating damp
Damp patches at any height that appear or worsen after heavy rain.
Condensation & mould
Black mould in corners and around windows, and streaming glass in winter.
Damp-affected timber
Wet rot, dry rot or woodworm where moisture has reached joists and skirtings.
Also serving nearby in Greater London
Hillingdon is one of many towns we cover across Greater London — we're regularly working in these nearby areas too:
Related damp services in Hillingdon
See all damp proofing services →Damp proofing in Hillingdon — frequently asked questions
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 Hillingdon?
Most single-wall damp-proof course treatments in Hillingdon 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.
Is the damp survey really free?
For most straightforward domestic jobs, yes — a survey and fixed quote are free with no obligation. A detailed independent report (for a house purchase, mortgage or dispute) is a paid, separate service, which we confirm up front.
What is a damp-proof course (DPC)?
A DPC is a barrier that stops ground moisture rising up through a wall. Older properties may have a failed or missing one; we install a new chemical DPC by injecting a water-repellent cream into the mortar course, which cures to form a continuous barrier.
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 Hillingdon
Tell us about the damp and your postcode — we'll arrange a survey and a fixed written quote.