Flush casements, tilt and turn windows and doors, Hanslope

The building is a stone barn conversion, rubble limestone walls a couple of feet thick, stone cills and deep reveals, with a brick cill under one opening where the wall was made good. That kind of wall decides the job before anyone picks a product: the openings are irregular, the reveals are deep, and anything that stands proud of the stone announces itself from the yard. Everything we fitted here is anthracite grey, RAL 7016, so the glazing reads as one decision against the limestone rather than as several orders.

Most of the elevations take flush casement windows on the Liniar 70mm flush sash system, where the sash closes level with the outer frame instead of sitting on top of it. On a stone building that flat face is most of the point, because it is how a timber window sat in the same opening. The system is A+ rated and reaches 1.2 W/m²K with a 28mm double glazed unit, and there are trickle vents in the frame heads, so a room can be aired with the window shut.

One opening takes a tilt and turn instead, and it is worth knowing why. It opens two ways from one handle: tilt the top of the sash inwards for ventilation, or swing the whole sash inwards like a door to clean the outside face from indoors. On a first floor above a border, where an outward opening sash has to clear the planting and the outside of the glass is otherwise a ladder job, that is the difference between a window you can maintain and one you cannot. It is the same Liniar 70mm frame and it is double glazed here, which Liniar publish at 1.3 W/m²K for this window. The hardware is concealed in the frame, so from outside there is nothing on the face of it but the sash line.

Two doors. The courtyard side has a composite double door, two leaves on a woodgrain slab, with ten small diamond panes of decorative glass set in a fan across the pair and a long bar handle on each leaf. We fit Distinction doors, whose slabs are accredited by Secured by Design, and every composite door we fit carries a £5,000 security guarantee, terms applying. The garden side has a uPVC door onto the decking, glazed in a single pane from head to threshold with a trickle vent above it and a lever handle, so the room behind keeps the view out over the fields.

The timber lintel and surround around that garden door are the building's own and were kept. So were the stone cills. We did the windows and the doors.

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