Welcome to karnheath

Save up to
£180 on your
annual fuel bill

Keeping your home warm, energy efficient and best of all saving you money.


Karnheath Ltd are a family run provider of insulation services operating throughout the North East dedicated to keeping your properties warm, energy efficient and best of all saving you money.


We supply and install loft and cavity wall insulation to domestic properties, commercial
premises as well as new build sites. We also offer cavity insulation extraction
should you wish to remove any defective material.


Based in Newcastle upon Tyne, we cover the North East, Cumbria, Yorkshire and the Scottish Borders.

Why Us

Over 40 years’ experience supplying and fitting loft and cavity wall insulation. 100% secured grant funding for occupants in receipt of benefits and on low incomes. To see if you qualify for a grant, click here.

Free of charge, no obligation surveys.

Accredited members of the government endorsed quality scheme Trustmark demonstrating our commitment to high level customer service and technical know-how. CHAS health and safety verified.

Trusted members of:

Cavity Wall Insulation

The highest proportion of heat loss from your home is through the cavities in your walls. Up to 35% can be lost indicating how much energy we consume in excess of what we actually require.   Karnheath Ltd installs BBA approved product CWI 18 mineral glass fibre to ensure minimum loss of heat as well as reducing utility costs and improving the energy efficiency of your home.

Loft Insulation

As much as 25% of heat can be lost through the roof of a house that doesn’t contain any loft insulation. By insulating the loft space, the temperature throughout the building will stabilise as well as reducing fuel bills and reducing the carbon footprint of the property.

Karnheath Ltd installs two approved products: Knauf and Isover to the minimum building regulation standard of 270mm. The quilt is packaged in widths to accommodate most loft and joist spaces.

Loft hatches that require draughtproofing will be done as part of the install as well as any pipe lagging that may be required.

Our Recent Projects

County Life

A premium house builder specialising in small developments, Karnheath has had the pleasure with working with county Life on several new build projects including Brunton

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A well-established house builder throughout the country, we have supplied and fitted loft and cavity wall insulation on sites in Sunderland and Ashington

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Ascent Homes

An award-winning housebuilder in the North East, Karnheath is appointed as the principal insulation contractor on the Ellington site in Northumberland.

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A large, nationwide energy and regeneration company has contracted Karnheath to insulate loft and cavity wall insulation to various new build housing developments in Tyne

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Galliford Try

A large nationwide construction business that contracted Karnheath for loft insulation on various projects including the new build Army Barracks at Catterick Garrison.

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STP Construction

As a building and civil engineering contractor here in the North East, Karnheath has supplied cavity wall insulation to various projects including the Tyne Tunnel

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