St Albans, Hertfordshire · 4 weeks

A rear extension opened up with 6m of aluminium bifolds

Name: South East Windows & Doors
Address: 421 Westcott Venture Park, Aylesbury, Buckinghamshire, HP18 0XB, GB
Telephone: 020 3633 0405

A single-storey rear extension on a 1930s semi. The clients wanted the kitchen-diner to feel continuous with the garden — but the wall run also needed to hit modern thermal performance and take a family of four's daily wear.

A rear extension opened up with 6m of aluminium bifolds — St Albans, Hertfordshire

The challenge

6.2 metres of clear opening with a structural steel beam above. Bifolds needed to stack cleanly to one side without eating into the internal worktop run, and the whole assembly had to be installed in a single day to keep the kitchen fit-out on schedule.

Our solution

We specified a 6-panel aluminium bifold in graphite grey with a low threshold, thermally-broken frames, and 28mm A-rated glazing. Two matching fixed picture windows flanked the doors, and three flush-glazed rooflights delivered mid-room daylight. Installation was completed in a single day with a factory-prepped subframe.

The outcome

The kitchen-diner reads as one continuous space with the garden. Whole-window U-value of 0.9 – 1.4 W/m²K across all new apertures, tested air leakage under 3 m³/h·m² at 50 Pa. The main contractor kept the kitchen install on programme.

Project gallery

Inside the build

Black aluminium bifold doors folded and stacked fully open on a brick kitchen extension, opening onto a lit terrace at dusk — 5-panel aluminium bifolds · St Albans

Corner-configuration black aluminium bifold doors on a modern British brick extension, opening onto a stone terrace at dusk — Corner bifold · Berkhamsted

Interior view looking out through open black aluminium bifold doors onto a lit garden at dusk from a luxury open-plan kitchen — Interior · open-plan kitchen threshold

Slim-frame anthracite grey aluminium picture windows on the rear elevation of a British home at dusk with warm interior kitchen light — Slim-frame aluminium · rear extension, Surrey

Anthracite grey aluminium windows on a rear brick extension at dusk with warm dining-room light visible through the glass — Anthracite aluminium windows · rear extension

Large fixed black aluminium windows on the rear extension of a Victorian London townhouse at twilight with a warm designer kitchen interior visible — Aluminium picture windows · Islington extension

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