2022 has seen a real rise in the popularity of Curved-In-Plan Units. These are a specialist window design that requires careful design and planning. Because of the degree of specialism involved, Storm Windows is one of the few companies in the UK that provide this particular product.

Not only do we create slimline units with curved-in-plan, but we also create horizontal sliding units with curved-in-plan. We do this by creating a template using paper when surveying the windows, this template creates an exact copy of the curved window.

A MDF template is then made from the paper template in our workshop, then sent to the glass company to create the curved glass. The glass is created oversized and is then cut to size by hand in the workshop. Safety film is then applied to the glass after it has been cut.

Our specialist skills in the creation of curved-in-plan units were called upon to help with the prestigious K1 Knightsbridge development. This is a stunning mixed-use development made up of commercial residential and retail space on the corner of Brompton Road and Sloane Street in the Royal Borough of Kensington and Chelsea.

The 340,000 sq. ft. project comprises contemporary high-end retail and office space, 35 residential units and a rooftop restaurant offering panoramic views of the area.

The developer, Skanska, went through a few stages of window development before they were satisfied. We developed an option where the secondary glazing was fit to the structure of the original window. This means that when you open a window, the whole window, including the secondary glazing, would open rather than opening a secondary glazing unit to access the original window. The windows original ironmongery was then fitted over the secondary glazing fittings, giving the client the thermal and noise reductions they were looking for on the 33 of the 60 windows that were being installed.

As well as this exciting project, our curved-in-plan units were commissioned for the Bury Street project for the Crown Estate in London and The Pick Building in Leicester.

Bury Street, London

Pick Building, Leicester

Residential properties

Most recently, an owner of a property in Scotland was looking to add extra warmth and insulation to an alcove. Despite its beautiful view, the space was too cold and draughty to linger, particularly in the winter. We added 3 curved-in-plan units to the windows in the alcove, two slimline units and a horizontal sliding unit for the centre window. Now the alcove can be enjoyed all year round as the windows are far less draughty and the space is much warmer.

The owner of this beautiful period window below didn’t think it could be secondary glazing could be fitted, and if you look at its complexity, you can see why. For such a complex window we used traditional bespoke curved glass and fitted units to each frame. This previously draughty space is now a warm and cosy place to sit day and night and we’re thrilled we could make that happen.

To find out more about the benefits of our secondary glazing units, please click here.