Single-storey rear extension · Broadgreen, Swindon · Aug – Sep 2026

Shrivenham Road, Broadgreen

A single-storey rear extension on a family house in Broadgreen, east of the town centre, built over August and September 2026. Footings and drainage, then the slab, insulated cavity walls, the roof, a steel-framed opening through the old rear wall into the house, render and new French doors, and a plastered room ready to decorate.

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At a glance

The job in one look

What we built: Single-storey rear extension with new drainage, insulated cavity walls, roof, structural opening into the existing house, external render, French doors and a new window, plastered inside.
Where: Shrivenham Road, Broadgreen, Swindon
When: Aug – Sep 2026
Done by: SwiftBrick’s own team throughout: groundworks, blockwork, structural opening, roof, render, windows and doors, plastering.

The existing kitchen sat in a narrow outrigger with the garden beyond it. The new extension squares the back of the house off and gives a proper kitchen-dining room with doors straight onto the garden. Building Control saw the trenches before the concrete went in, and the existing drains that ran under the new footprint were picked up and re-routed first.

Stage 1 of 6

Before

The rear of the house in August 2026: the original outrigger, a dry lawn and the line of the new footprint across it.

Rear garden and outrigger of the Broadgreen house before building work — Where the new room will sit.

Stage 2 of 6

Footings and drainage

Trenches dug to the depth Building Control asked for, the existing drains exposed and re-routed where the new walls crossed them, new inspection chambers set, and the footings built up in trench blocks with the drainage cast through sleeves rather than built around.

Foundation trench being excavated behind the house — Trenches going in.

Excavated foundation trench with timber shuttering beside the house — Trench to depth; shuttering where the ground needed it.

New drainage run and inspection chamber in the excavation — Existing drains picked up and re-routed.

Trench-block footing with a new drain pipe passing through a sleeve — Drainage sleeved through the footing, not built round it.

Completed footings forming the outline of the new extension — Footings complete — the room’s outline in block.

Stage 3 of 6

Slab and walls

Oversite concrete poured inside the footings, then cavity walls: blockwork inner leaf, full-fill cavity insulation and the outer leaf, built up around the new window and door openings. The walls were tied into the existing house and built true to the old corner.

Oversite concrete slab poured within the new footings — The oversite slab down.

Cavity blockwork walls rising with a window opening formed — Blockwork up, window opening formed.

Full-fill cavity insulation between the two leaves of blockwork — Full-fill insulation going into the cavity as the walls rise.

Extension walls at full height with a lintel over the opening into the house — Walls to height, lintel in over the opening.

Stage 4 of 6

Roof on and the opening into the house

Once the roof was on and watertight, the old rear wall came out beneath its new steel to join the extension to the house — propped, cut, bedded and inspected before the wall below was removed.

Extension roof on with the structure watertight — Roof on, watertight.

Structural opening being formed through the original rear wall of the house — September: the opening through the old rear wall being formed under its new steel.

Stage 5 of 6

Render, doors and windows

The outside was rendered to match the rest of the house. SwiftBrick supplied and fitted the French doors and the new window, with the openings built to the frame sizes so the reveals are tight.

New French doors fitted in the rendered rear extension — French doors in, render on.

Rendered side elevation of the new extension with a new window — The side elevation, rendered, with the new window.

Stage 6 of 6

Plastered and handed over

Boarded and skimmed inside and handed back as a room ready to decorate and fit out. Finished in September 2026.

Inside the new extension, plastered and ready to decorate — Plastered, ready for the decorator.

The finished rendered extension from the garden — The finished extension from the garden.

Wide view of the completed rear extension and the house — The back of the house, squared off.

Finished French doors and rendered walls of the extension — Doors, render and window complete.

The result

Six weeks from trench to plaster

A rear extension with the drains and Building Control inspections dealt with properly on the way, rendered and glazed by our own team, and handed over plastered in September 2026.

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Prefer to talk? 07460 232373 · luke@swiftbrick.co.uk