Rear Extension

Sydenham Rear Extension

Sydenham, South London

Location

Sydenham, South London

Property

Victorian semi-detached house

Project type

Single-storey rear extension

Extension depth

6m

Services

[SERVICES PROVIDED]

Completed

[YEAR]

The House and the Brief

This large Victorian semi-detached house in Sydenham is built in London stock brick, with red brick arches and banding, sash windows and an existing loft dormer. The owners wanted a bigger ground floor, and they were clear about what they would not give up for it.

The garden behind the house is mature and densely planted. Keeping as much of it as possible mattered more to them than maximising floor area, so the brief was a 6m single-storey rear extension and no wraparound.

Design visualisation of the Sydenham rear extension, showing a slate roof with a rooflight and bifold doors on the flank and rear elevations
Design visualisation

Design

The Vision

The idea was easy to state and harder to draw: keep the garden, and open the house to it on two sides. A wraparound would have built over more of the plot. A single rear extension of the right depth leaves that ground alone.

By glazing both the flank and the rear, we gave the kitchen, the dining table and the lounge each their own view of the planting. The garden becomes part of the room, rather than something seen through one opening at the far end.

Design Approach

Depth, Not Width

The clients were unambiguous: no wraparound. A wraparound adds area by building out to the side as well as the rear, and here that would have meant building over planting they wanted to keep. We held the extension to a single 6m projection from the back of the house.

Six metres is enough depth to plan three zones within one open space. The kitchen sits against the house, dining in the middle, and a lounge at the garden end. Each has its own furniture layout and its own relationship to the glazing, so the room suits a family meal and a quiet evening without being rearranged.

Interior of the rear extension with black aluminium glazing along the flank, a linear drain at the level threshold, a dining table and the kitchen beyond
Flank glazing with level threshold, dining table and kitchen beyond.

Glazing on Two Elevations

Most rear extensions meet the garden through one wall. Here the flank faces the lawn as directly as the rear does, so both elevations have slim black aluminium bifolds. Opened fully, the flank doors put the dining table at the edge of the lawn. The rear set opens the lounge to the end of the garden.

The details exist to make that threshold easy to use. Large-format pale porcelain paving runs out from the doors, and a linear drainage channel along the sill allows a level threshold, with no step from inside to out. Above the openings, a red brick soldier course picks up the Victorian banding. The reclaimed-style London stock brick was matched to the house.

Lounge at the garden end of the extension with black aluminium bifold doors on the rear and flank elevations and two Velux rooflights above
Lounge at the garden end, glazed on two elevations.

A Roof That Belongs to the House

The roof is finished in slate, with its pitches set to the same angles as the main roof. From the garden, the extension reads as part of the original building.

A pitched roof over a 6m plan can leave the middle of the room short of daylight. Velux rooflights bring light deep into the plan and let warm air out at high level. We positioned them to limit solar gain, so the kitchen end, furthest from the garden, stays bright without the room overheating in summer.

Vaulted ceiling with Velux rooflights over the dining table, with rear bifold doors to the garden and the kitchen beyond
Velux rooflights over the dining table and kitchen.

The Completed Extension

Start Your Extension

If your garden matters as much as the extra space, we can show you how far a rear extension can go before it starts taking from it.

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