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Hertfordshire · England

Damp investigation after cavity insulation in Hertfordshire

Damp investigation after cavity insulation across Hertfordshire, priced before you book, with the findings written up and photographed. 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.

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Moisture meter held against a damp, mould-spotted corner of an external wall indoors

Book a damp investigation in Hertfordshire

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We use your details only to answer this enquiry and arrange your visit, sharing them only with the registered installer we appoint for your job and the providers named in our privacy notice. No marketing lists, no cold calls.

Damp investigation after cavity insulation across Hertfordshire

We cover 17 towns in Hertfordshire, including Watford, Hemel Hempstead, Stevenage, St Albans, Welwyn Garden City and more.

Exposure matters for every cavity wall. Much of Hertfordshire sits in the more sheltered driving-rain zones of the UK, which widens the choice of fill. Exposed elevations, coastal sites and high ground still get checked wall by wall.

If your Hertfordshire installation has a guarantee, we check it first; the guarantee route may cover the work. We never cold-call in Hertfordshire or anywhere else, and we do not work with doorstep claims companies.

Building Regulations in England

Filling an existing cavity wall is notifiable building work in England. Either a building notice goes to building control before the work, or the installer self-certifies it through a government-approved competent person scheme such as CIGA's CWISC scheme. The insulation used must also be suitable for the wall it goes into, which is why the survey checks construction, condition and exposure first.

Sources: Planning Portal: cavity wall insulation and building regulations; CIGA: CWISC competent person scheme.

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

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

Damp investigation after cavity insulation prices in Hertfordshire

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.

How it works in Hertfordshire:

  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 Hertfordshire: questions

Do you cover all of Hertfordshire?

Yes. We cover 17 towns across Hertfordshire, including Watford, Hemel Hempstead, Stevenage and St Albans, and the villages around them. Island and remote addresses are surveyed by arrangement.

Do you cold-call in Hertfordshire?

No. We only come out when you have asked us to. If someone cold-calls offering free insulation, check before you agree to anything.

What will I get from a damp investigation in Hertfordshire?

A visit at an agreed price, photos of what we find, and a written summary in plain English. Any follow-on work is priced separately so you can choose who does it.

Do you work on rented homes in Hertfordshire?

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

Damp investigation after cavity insulation in nearby areas

Book a damp investigation in Hertfordshire

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

Request a price