Building Social Value through Double Glazing

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Our Accreditations

We take all our responsibilities seriously at Cosyseal and there is often no better demonstration of that than receiving third-party accreditation.

Cosyseal has achieved the following accreditations and memberships:

FENSA Registered, IS0 14001, IS0 9001, CHAS for our Health and Safety and ConstructionLine. To further demonstrate our commitment, we were awarded with the Contractor of the year’s award in 2013.

ISO 9001- Quality Management System

With this accreditation we drive our business forward with the world’s most recognised quality management system standard that demonstrates the ability to provide consistent quality for the future manufacture of PVC-U windows and doors.

ISO 9001 Quality Management helps our business to:

ISO 14001- Environmental Management

This accreditation enables us to lead the way in environmental efficiency savings with our rigorous environmental management system standard.

ISO 14001 Environmental Management helps our business to:


Fenestration Self-Assessment Scheme. It is a competent person’s scheme and industry standard founded by the GGF. When a homeowner commissions new windows, doors or roof lights to replace existing glazing they are required to ensure that replacements comply with current thermal performance standards and Building Regulations. To do this they need to get a certificate stating that the glazing is compliant.

Cosyseal has had its windows/doors pretested to show we adhere to current Building Regulations standards for thermal insulation. We issue a certificate of compliance for the homeowner’s records without them having to contact the Local Building Authority.


The Contractors Health & Safety Assessment Scheme demonstrates compliance with, and sound management of, current Health & Safety Legislation.


Originally established by the UK government in 1998, it was later acquired and operated by Capita business services under a concession from The Department of Trade and Industry. ConstructionLine Accreditation demonstrates how we achieve the National Standard.


Cosyseal Building Products’ Environmental Management System has been accredited to ISO 9001.

The organisations have been recycling both 1st generation PVC-U windows for many years. 1st generation is the name for old PVC-U windows which are being replaced.

Whilst the 1st generation frames are normally still functional, the glazing system may be low security and many of the windows are single glazed, also the locking mechanism is often very basic. Our clients have decided to replace them to improve the security and energy efficiency.

Noise Reduction

Cosyseal‘s windows and doors are designed and manufactured with our customers in mind. We strive to offer quality products that offer value for money and so much more.

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