Certifications & Accreditations

As a leading provider of doors, windows and glazed extensions throughout Sussex, Window Wise has achieved the following certifications and accreditations that prove our dedication to providing both fantastic products and top-tier customer service:

Ultra Installer

Ultra Installers are assessed by Ultraframe for quality conservatoriesorangeriesextension and replacement roofs.

Window Wise’s acceptance into the scheme recognises our high standards of work in the area of orangeries and conservatories, our experience of which has seen countless homes in East and West Sussex improved by our installations.

Trading Standards Approved Business

Window Wise is a ‘Buy With Confidence’ Trading Standards Approved business.

Businesses are only included once they’ve completed a series of stringent checks, including a visit by a qualified Trading Standards professional.

FENSA certification

Window Wise is certified by FENSA – a government authorised Competent Persons Scheme for the replacement of windows, doors and roof lights in England and Wales.

To achieve this certification, Window Wise has undergone a strict vetting procedure and are routinely inspected to ensure Building Regulation compliance is maintained.

Glass & Glazing Federation Member

As a GGF member Window Wise complies with the GGF Consumer Code of Practice, which is approved by the Chartered Trading Standards Institute and has strict requirements regarding the conduct of Member companies ensuring they comply with all relevant consumer legislation.

All GGF Member companies are audited on a regular basis to ensure their compliance.


Window Wise is an accredited SafeContractor.

This independently assessed scheme gives you the assurance that we are committed to sustainable and ethical practices, and maintaining only the highest health and safety standards.