Specialist External Wall Insulation Repair and Maintenance providers

Cornerstone specialises in the installation, maintenance and repair of external wall insulation (EWI), having over a decade’s experience in the industry.

EWI is an excellent solution to improve the thermal efficiency and appearance of solid wall properties, and is largely a low maintenance measure.

However, EWI will still require some form of maintenance from time to time – including cleaning, repainting or minor repairs.  In some cases, where EWI has been installed incorrectly, more wide-ranging repairs may be required.  Similarly, specialist repairs may be required to address accidental damage.

Cornerstone is able to offer a flexible and competitive range of services to both individual householders as well as social landlords, protecting your investment and the validity of your warranty.  We work with all the major manufacturers and are able to maintain EWI that has been installed by ourselves or other contractors.



The benefits of our EWI health check, cleaning and maintenance service includes:

Rectifies defects before they escalate into serious problems

Maintains compliance with warranties

Maintains the aesthetic and value of the property

Ensures the EWI lasts its full life cycle


Enquire about EWI Repair & Maintenance today...


Cornerstone offers the following EWI repair and maintenance packages:

This is a comprehensive health check of the external elevations of the property.  It will be undertaken by an experienced EWI surveyor, who will look for issues including water ingress, blocked vents, leaking water goods, impact damage, performance/appearance issues, broken seals around pipes and penetrations and broken or cracked over cills and reveals.  A report will be provided detailing any issues identified, supported by photographic evidence and recommendations for remedial works that comply with the measure warranty.  For example, silicone sealant does deteriorate, so is likely to require replacement over the life of the EWI.  Any remedial work that may be required would be quoted separately. 

Prices for each package are available on enquiry, with a discount provided for volume for social landlords. 

In addition, we offer one-off repairs for puncture holes, surface damage, full-depth damage and brick slip damage, plus in-fill works where items such as gas meter boxes have been moved.


Cornerstone is based in East Anglia and can generally provide services from individual installation level upwards in the following locations:

Norfolk,  Suffolk, Essex, Cambridgeshire, Peterborough, Bedfordshire, Lincolnshire, London, Kent, Sussex, Buckinghamshire, Berkshire, Nottinghamshire

However, we can deliver larger projects across the length and breadth of mainland England, from the South West to the North East.

01379 853 613

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Registered Office: Cornerstone (East Anglia) Limited, Unit 2-4, Fuller Road, Harleston, Norfolk, IP20 9EA.
Registered No.05117129. Registered in England and Wales.