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Belfast · County Antrim

Damp investigation after cavity insulation in Belfast

Damp investigation after cavity insulation in Belfast is priced before you book, and what we find is written up with photos. A damp investigation finds out why an insulated wall is showing damp or mould: rain getting in through defects, bridged or wet fill, debris in the cavity, a breached damp-proof course, or condensation.

Book a damp investigation in Belfast

Covering Belfast and the BT1 district. Tell us about the property. We confirm the price before you book.

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Damp investigation after cavity insulation for Belfast properties

Our County Antrim coverage takes in Belfast (BT1) and nearby Newtownabbey, Lisburn and Carrickfergus. Belfast is one of the main towns we cover in County Antrim.

Damp in an insulated Belfast home is not always the insulation's fault, so the diagnosis comes before any extraction. If your Belfast installation has a guarantee, we check it first; the guarantee route may cover the work.

Local weather affects which walls can be filled. Parts of County Antrim 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.

In terms of approvals, if cavity wall insulation follows in Belfast, 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.

What you get

Moisture readings, borescope photos at the affected areas, an explanation of the likely cause and the options, from simple repairs to partial or full extraction, each priced.

What is included in Belfast

  • Moisture mapping inside
  • Borescope at affected areas
  • External defects check
  • Cause and options in writing

Guide prices for Belfast

Damp investigation after cavity insulation guide prices
Damp investigation after cavity insulation guide pricesGuide 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.

The steps for a damp investigation in Belfast:

  1. Get in touch

    Online, by phone or WhatsApp.

  2. Your price

    Confirmed in writing before you book.

  3. The visit

    Carried out at an agreed time, with photos of what we find.

  4. Your report

    Plain English, with any follow-on work quoted separately.

Last reviewed 19 October 2026.

Damp investigation after cavity insulation in Belfast: questions

Do you cover Belfast?

Yes. Belfast and the BT1 postcode district are within our County Antrim coverage, along with nearby Newtownabbey and Lisburn.

How much does a damp investigation cost in Belfast?

Guide prices are shown on this page, and the price for your Belfast property is confirmed before you book.

Do you work on rented homes in Belfast?

Yes. Landlords and agents in Belfast can book batch visits, and work is arranged around tenants.

Is there VAT on a damp investigation in Belfast?

Damp investigation after cavity insulation is not insulation, so it is normally charged at the standard rate of VAT. The VAT treatment is confirmed on your quote.

Nearby towns

Book a damp investigation in Belfast

Priced before you book. Findings in writing. No cold calls.