Flush Sash Windows

A heritage profile built for modern performance

Designed to replicate the slim sightlines and flush-fitting sash of a traditional timber window, our flush sash range is mechanically jointed rather than welded at the corners for an authentic look, then glazed and weathersealed to full modern performance standards. It's a popular choice for period properties, conservation areas and anyone who wants a timber look without the repainting.

Check conservation area rules
Flush sash window open on traditional side hinges
Airflow

Traditional side-hung opening

Flush sash windows are hinged from the side in the traditional style, opening outward for full ventilation, with a choice of brass, chrome or black ironmongery to finish the look.

Security

Modern locking behind a period face

Behind the heritage styling sits the same multi-point shootbolt locking as the rest of our window range, tested to PAS 24, so you don't have to trade security for character.

Brass ironmongery on a flush sash window

Unlike a standard casement, the sash of a flush sash window sits within the same plane as the outer frame rather than overlapping it — replicating the look of a genuine timber window. Mechanically jointed corners, rather than welded, add to the authentic profile, making this our most popular choice for period and conservation-area homes.

Close-up of a flush sash window corner joint
Flush Sash Windows FAQs

Common questions about flush sash windows

The sash — the opening part of the window — sits flush within the outer frame rather than overlapping it, and the corners are mechanically jointed rather than welded. The result is a slimmer, more traditional profile that closely replicates a timber window.

In many cases, yes — their heritage profile and choice of woodgrain foils and traditional ironmongery make them a popular choice where planning guidance favours a timber appearance. We'd always recommend checking with your local conservation officer before ordering.

Handles, hinges and stays are available in brass, chrome, satin chrome and black, so you can match the ironmongery to your home's period.

Yes — rather than welding the frame corners, as with a standard casement, flush sash frames are mechanically jointed. This is a more time-intensive process but gives a crisper, more authentic corner detail.