Subframes UK are the largest supplier of welded and mechanically joined cavity closers in the UK

Subframes UK manufacture cavity closers to suit all makes and types of doors and windows suitable for brick and block, timber frame, Metsec or any other build type.

We offer a bespoke service designed to meet unique specifications from architect design to site approval with samples supplied.

Our cavity closers can be manufactured as 2, 3 or 4 sided frames supplied with or without vented heads, as circles, arches, ovals, mosque or as a combination T or P shaped flags.

Subframes offer standard, fire rated and structural frames from 50mm to 300mm all of which are manufactured to the highest standard in our 30,000sqft factory.

Cavity closer lengths

Profiles can be supplied in 6m or cut lengths. All profiles are BBA certified and meet part L of building regs. We offer a wide range of profiles from some of the countries leading extrusion houses.


Do you make bespoke Cavity Closers?

Subframes are the largest supplier of mechanically jointed and welded cavity closers here in the UK. Our range of bespoke cavity closers (also known as window formers) are engineered to meet the exact specifications of your project, including your unique architectural blueprints and designs.

At Subframes, our cavity closers are manufactured as 2, 3 or 4-sided framed and can be supplied with or without vented heads as arches, ovals, circles or a combination of T or P-shaped flags. We also offer your choice of standard, fire-rated and structural frames fitting 50mm to 300mm cavities – all of which are constructed to the highest possible standard in our 30,000ft² factory.

For more information about our range of custom closers, please get in touch with the team at Subframes today.

How long does it take for you to design Cavity Closers?

The timeframe for your custom closers will come down to the unique specifications of your projects and what you require. For more information about our range of bespoke cavity closers, get in touch with the team at Subframes. We can assess your needs and design cavity closers based on what you require, as well as the task at hand.

What manufacturers do you work with?

Subframes are the largest supplier of welded and mechanically jointed cavity closers here in the UK. As a result, we work with a number of manufacturers, including Cavalok, Dacatie, Duraflex, Kingspan and Titon Vents.

Can I have a call with your Cavity Closer experts?

The expert team at Subframes UK would be delighted to speak with you about your next project. For product information, technical support or a quote, please get in touch through the contact form on our website. You can also give us a call on 01773 590100 or email us at [email protected].

How will my Cavity Closers be delivered?

Subframes UK offers nationwide delivery for our cavity closers, which are often delivered on behalf of a third party. As a result, we utilise a fleet of unmarked vehicles. Proof of delivery will be supplied to the customer following arrival.

What is a Cavity Closer used for?

Cavity Closers or Windows Formers act as a seal to insulate your property properly. They are used for the purpose of overcoming thermal loss that can occur around unprotected cavities. Thermal loss can result in lower energy efficiency ratings, as well as cause problems relating to condensation, water staining and mould growth in your home. As a result, cavity closers are a hugely important factor in insulating your home from the effects of adverse weather.

Further benefits arise in relation to the construction process, as the cavity closer can be used in place of dummy timber frames, meaning less waste and more convenience to the builder. It also creates a solid, square template from which to create the brickwork around your structural openings. This allows for faster and more accurate brickwork.

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