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  • FENSA is a government authorised Competent Persons Scheme for the replacement of windows, doors and rooflights in England and Wales.

    This post will aim to clear up any confusion and enable those purchasing a glass rooflight to understand when a FENSA certificate is required.

    So let’s start with what a FENSA actually is…

    FENSA stands for the ‘Fenestration Self-Assessment scheme’ which has been set up by the Glass and Glazing Federation (GGF) as a means to self-certify compliance under Building Regulations without the need for a separate assessment from Building Control.

    The FENSA register collates a list of accredited double glazing installers across England and Wales so that homeowners can ensure they are choosing a reputable and experienced home improvements company. Registered with the government, the Fensa register assures that the double glazing installer is professional, complies with building regulations and offers an insurance backed warranty, for ultimate peace of mind.

    If your installer is not registered with FENSA any works that include replacing windows, doors and roof lights will require you to get a certificate from Local Authority Building Control instead.

    When does FENSA apply to glass rooflights?

    FENSA certification can only apply if you are replacing an existing skylight window; installation of a new skylight will require certification from Building Control to ensure that any structural changes and thermal performance meet current regulations.

    FENSA does not apply to conservatories, porches, commercial premises, new build properties or extensions. In all of these instances you are required to go through the Local Authority Building Control process.


    If the rooflight is a new addition to your property, or the building itself forms part of an extension or is a complete new build, then FENSA does not apply and you will require approval from Building Control.

    If you are replacing an existing rooflight, you can use a FENSA approved installer or alternatively apply for full Local Authority Building Control approval.

    Please note that the homeowner is ultimately responsible for ensuring that their rooflight installation complies with these standards and regulations.

    For more information give us a call on 01379 771002 or browse our online rooflights shop.