The Future Homes Standard is changing the conversation around window performance. For fabricators, the challenge is no longer simply about meeting the requirements of today, but understanding where regulation is heading and making sure the products they manufacture are ready for what comes next. Gerald Allen, head of marketing at Epwin Window Systems, explains how the new Profile 22 flush casement window has been developed with that future firmly in mind.

There has always been a danger with regulation that we focus too heavily on the date it comes into force. But for systems companies, the real work has to begin much earlier.

The Future Homes Standard is a good example. Its intention is clear: new-build homes need to combine low-carbon heating with much higher levels of energy efficiency as the UK moves towards net zero. And while the direction of travel has been understood for some time, the implications for fenestration are becoming increasingly important.

Changes to Approved Document L, which come into force for non-HRB work on 24 March 2027, will place greater emphasis on the actual thermal performance of the window being installed. Rather than relying on a standard configuration, the U-value will need to reflect the window as specified, including elements such as cills, frame extenders, dummy sashes, mullions, transoms and decorative glazing bars.

That means there is increasing value in having greater thermal headroom within the window system itself. For us at Profile 22, that thinking has been central to the development of our new flush casement window.

Rather than designing around the minimum requirements of today, we wanted to create a new-generation system with the flexibility to respond to changing regulation, specifications and homeowner expectations.

One of the biggest developments is glazing capacity. The new Profile 22 flush casement window can accommodate 24mm, 28mm, 36mm, 40mm and 44mm glazing units, opening the system up to high-performance triple-glazed configurations.

Combined with its redesigned multi-chamber thermal inserts, this means the new window can achieve U-values as low as 0.8 W/m²K, compared with 1.2 W/m²K previously. That’s a 33% reduction in U-value and, importantly, gives fabricators valuable performance headroom as building standards become more demanding.

For us, that’s an important part of being future-ready. It shouldn’t mean having to change products every time regulation moves forward. It should mean having a window system with enough flexibility and performance designed into it to respond as requirements evolve.

Of course, Future Homes isn’t just a thermal performance story. That’s why we looked at the flush casement window as a complete performance package.

Depending on configuration, the system can achieve a Window Energy Rating of A++, acoustic performance of 36dB to 44dB, water tightness to E1200 at 1200Pa and wind loading up to Class A5 at 2000Pa. Structural capability has also been enhanced, increasing suitability for exposed locations and allowing larger sash sizes.

Security has been strengthened too. The new flush casement window is PAS 24:2022 compliant across glazing options and sash sizes as standard and can meet Secured by Design criteria where required, while wider hardware compatibility gives fabricators greater flexibility in manufacture and specification.

When it comes to flush casements, distinctive aesthetics are a major part of their appeal. Externally, the new Profile 22 flush casement window retains the authentic proportions associated with traditional timber casements, including slim-depth sashes, putty-line detailing and mechanically jointed options.

Internally, however, we’ve introduced a completely flush sash-to-frame appearance, creating a cleaner, more contemporary finish that broadens its appeal across both traditional and modern properties.

Importantly, these advances haven’t come at the expense of fabrication practicality. The new window retains familiar fabrication principles and hardware locations wherever possible, supported by optimised wall thicknesses, effective drainage and accurately positioned seals.

The Future Homes Standard represents another significant step in how we think about the performance of our homes. For fabricators, being prepared means looking beyond current requirements and having the right products in place well before change takes effect. The new Profile 22 flush casement Window has been developed with exactly that in mind.