Let's find what you're looking for

    Lowest U-Values
    in the skylight industry

    arrow Back to news 28th April 2021

    U-values are touted by companies as a selling point for their products. Until now, all skylight U-values are calculated in exactly the same was as a vertical window, which gives a false reading and misleads the client.

    Many companies state u-values of 0.6 W/m2K, but they are readings from the centre pane of the glass and do not even include the frame. What is shocking and unregulated is that a company can state 0.6 W/m2K as a u-value yet when calculated properly in the horizontal and including the frame, the values can shoot up to 1.6 W/m2k or, in the case of one Leicester company, over 2 W/m2K, both of which would not pass planning permission.


    Sunsquare have always offered genuine U-value calculations and offer certificates with every skylight if required. Sunsquare are allowed by the BSI to calculate and publish U-values on their own products as well as other companies, which is where we know the reality of the dishonesty of most in the industry.


    We are now able to offer the lowest U-value products on the market without using triple or quadruple glazing at a relatively standard price. We have been working with glass technology companies to develop a whole product U-value that can be relied on and not only conforms to building regulations, but would sit comfortably in a passivhaus project. We are able to offer a whole product (including upstand) U-value on our fixed products of 0.662 W/m2K which we believe is the best U-value in the world for flat roof skylights and 1.01 W/m2K for our opening products, again including frame, glass, upstand and calculated in the horizontal.


    What is shocking is that many people are buying products based on U-value and actually not getting much more than one would get from a single pane of glass due to poor frame design and cold bridging. We are not the cheapest company in our industry, but we offer Kitemark honesty and re-assurance, which is unique to Sunsquare. Please, when comparing products, ask for a whole product U-value and not simply the centre-pane U-value. If we at Sunsquare simply gave our centre-pane U-value, we would be offering skylights with a U-value of 0.38 W/m2k, as an example.


    Should you require any further assistance with regards thermal efficiency for upcoming skylight projects, do not hesitate to contact our team on sales@sunsquare.co.uk or 01284844641

    Share this guide

    Want to know more

    If you want to know more about this or anything else then get in contact.

    Call us on 01922 714087

    Email sales@sunsquare.co.uk

    refine search

    The benefits of using BSI

    26 May 2020

    Desire for quality never stops

    In what has been one of the more traumatic times for British industry, Sunsquare, whilst not fully operational until beginning of May, have been busy during downtime. Our desire to continue to be the market leading in our field didn’t get locked down. Quite the opposite. Not only have we been testing product and designing, […]

    Read morearrow
    Self Cleaning Glass

    05 October 2019

    Thoughts on Brexit

    Obviously Sunsquare are not immune to industry trends, but it is comforting to see that the clients that have used our services over the recent turbulent months are citing quality and qualification as the reason for using the skylight budget with us.

    Read morearrow
    The importance of environmental management

    27 August 2019

    The Demise of a British Great | R.Durtnell and Sons Ltd

    We were very sad indeed to receive a letter a few days ago for the official receivers for R. Durtnell and Sons Ltd.

    Read morearrow
    Aero Pyramid Skylight

    10 August 2019

    Sing when you’re winning

    It’s been quite a few months for Sunsquare. New skylights launched, shows to shout about and a spanking new website to admire.

    Read morearrow
    Skylights and rooflights

    13 June 2019

    Another industry first for skylight pioneers Sunsquare

    Sunsquare has not only achieved the Kitemark accreditation for another 3 years, but the ISO9001 and ISO14001 accreditations with no non-conformities.

    Read morearrow

    Sunsquare Accessories

    Find out morearrow

    Sunsquare Skylights

    Find out morearrow

    Since 2004, Sunsquare Limited has been pioneering skylight design

    Call us on 01922 714087