Damp investigation after cavity insulation for Derry properties
Derry sits in County Londonderry. We work across the BT48 district, including nearby Limavady, Coleraine and Magherafelt.
Where a Derry wall does need work, bricks are lifted and rebuilt in matching mortar, and the cavity is checked with a camera before it is closed up. Damp in an insulated Derry home is not always the insulation's fault, so the diagnosis comes before any extraction.
Local weather affects which walls can be filled. Parts of County Londonderry face some of the heaviest wind-driven rain in the UK, especially exposed coastal and upland sites. Here the survey is stricter: some walls suit only certain certified systems, and some should not be filled at all.
For regulations, if cavity wall insulation follows in Derry, inserting cavity wall insulation needs a building control application to the council before work starts.
Rules in Northern Ireland
Inserting cavity wall insulation needs a building control application to the council before work starts if insulation work follows.
Sources: Building Control NI: frequently asked questions; Belfast City Council: what are the building regulations.
Common causes we check
Defective pointing, cracked render and porous bricks letting rain in; leaking gutters and downpipes; fill bridging the cavity where mortar droppings or debris have collected; ground levels above the damp-proof course; and condensation from cooking, drying clothes and too little ventilation.
What is included in Derry
- Borescope at affected areas
- External defects check
- Cause and options in writing
- Moisture mapping inside
Guide prices for Derry
| Damp investigation after cavity insulation guide prices | Guide price |
|---|---|
| Damp investigation with borescope | £295–£495 |
This work is not insulation, so it is normally standard-rated for VAT. Guide prices include VAT where it applies. Guide ranges only: the fixed price is confirmed in writing before any work starts, and anything that could not be seen at survey is agreed with you first.
From enquiry to finish in Derry:
Get in touch
Online, by phone or WhatsApp.
Your price
Confirmed in writing before you book.
The visit
Carried out at an agreed time, with photos of what we find.
Your report
Plain English, with any follow-on work quoted separately.