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Dumbarton · Dunbartonshire

Cavity insulation for new builds and extensions in Dumbarton

From the first survey to the paperwork, cavity insulation for new builds and extensions in Dumbarton is handled by one team and one contract. For new walls the cavity is insulated as it is built, using full-fill mineral wool batts or partial-fill boards fixed to the inner leaf.

Free survey in Dumbarton

Covering Dumbarton and the G82 district. Tell us about the property and we will arrange a free survey and a fixed price.

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Cavity insulation for new builds and extensions for Dumbarton properties

Dumbarton sits in Dunbartonshire, around 7 miles north-west of Clydebank. We work across the G82 district, including nearby Clydebank, Bearsden and Bishopbriggs.

Dumbarton properties with rendered or painted walls get a closer look at the outer finish, because cracked render can let rain behind it. Where a Dumbarton property has an extension or a conservatory, we check how the old and new walls meet, because that junction is often missed.

Every elevation is judged on its own exposure. Parts of Dunbartonshire 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.

As for paperwork, in Dumbarton no building warrant is needed for insulation within a wall, but the work must meet the building standards.

Funding in Scotland

In Scotland, Home Energy Scotland is the route to the Home Energy Scotland Grant and Loan and Warmer Homes Scotland.

Sources: Home Energy Scotland; mygov.scot: grants and loans for energy saving improvements.

Extensions that join an older house

Where an extension meets an existing cavity wall, the junction is a weak point. We can borescope and fill the existing wall at the same time so the old and new walls perform together.

What is included in Dumbarton

  • Trays, closers and stop ends as drawn
  • Photo record for building control
  • Batts or boards to the specified U-value
  • Clean-cavity working

Guide prices for Dumbarton

Cavity insulation for new builds and extensions guide prices
Cavity insulation for new builds and extensions guide pricesGuide price
Full-fill batts supplied and fitted, per m²£9–£16
Partial-fill boards supplied and fitted, per m²£14–£26

Prices are shown before any VAT; the VAT treatment for new-build work is confirmed on your quote. 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 Dumbarton:

  1. Tell us about the property

    Postcode, property type and what you need.

  2. Free survey

    Walls, cavity, condition and exposure checked and photographed.

  3. Written result and price

    Suitable, suitable after repairs, or not suitable, with a fixed price.

  4. Work and paperwork

    Installation, making good, and the regulations and guarantee paperwork.

Last reviewed 19 October 2026.

Cavity insulation for new builds and extensions in Dumbarton: questions

How much does cavity insulation for new builds and extensions cost in Dumbarton?

Our guide ranges for cavity insulation for new builds and extensions are shown on this page. The fixed price for your Dumbarton property is confirmed in writing after the survey, before any work starts.

How soon can you visit in Dumbarton?

We arrange dates when you get in touch. Availability varies through the year, so we give you real dates rather than a promise on the website.

Do you cover Dumbarton?

Yes. Dumbarton and the G82 postcode district are within our Dunbartonshire coverage, along with nearby Clydebank and Bearsden.

Is the survey free in Dumbarton?

Yes when it is for an install quote. Standalone reports for Dumbarton buyers, sellers or landlords who do not need an install quote are priced before you book.

Nearby towns

Book a free survey in Dumbarton

Free survey with an install quote. Written result. Fixed price before any work.