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Single Storey Extensions — Slough SL1

Rear Extension in Slough — 1930s Semi-Detached Kitchen Extension

Location

Slough, SL1

Project Type

Single Storey Extensions

Duration

10 weeks on site

Scope

Rear extension, pitched roof, brick match, structural opening, first fix

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Brick single-storey rear extension with anthracite bi-fold doors open to a gardenFinished open-plan living and dining space inside a new single-storey extensionSteel RSJ beam being installed into a brick opening during a single-storey extension buildRoof lantern skylight flooding a single-storey extension with natural lightGroundworks trench with concrete strip foundations for a single-storey extensionBricklayer laying facing brick courses on a new extension wallScaffolding around a house during a single-storey extension buildFlat GRP fibreglass roof being finished on a single-storey extensionFinished single-storey extension exterior at dusk with warm interior lightingBrick single-storey rear extension with anthracite bi-fold doors open to a gardenFinished open-plan living and dining space inside a new single-storey extensionSteel RSJ beam being installed into a brick opening during a single-storey extension buildRoof lantern skylight flooding a single-storey extension with natural lightGroundworks trench with concrete strip foundations for a single-storey extensionBricklayer laying facing brick courses on a new extension wallScaffolding around a house during a single-storey extension buildFlat GRP fibreglass roof being finished on a single-storey extensionFinished single-storey extension exterior at dusk with warm interior lighting

The Brief

A 1934-built semi-detached in Slough, SL1 — a property type that is extremely common in this area, built during the inter-war expansion of Slough as a manufacturing centre. The original kitchen was at the rear of the house, measuring 8 square metres. The clients wanted to push the rear wall back by 3.5 metres to create a practical kitchen with space for a dining table and bifold access to the rear garden.

Our Approach

A 3.5m rear extension on a semi-detached property exceeded the standard 3m permitted development limit, so it was carried out under the Neighbour Consultation Scheme, which extends this to 6m — no full planning application was required, just the pre-application notification and consultation period. Separately, since the extension sat astride the shared boundary, we served a Party Wall Act 1996 notice on the adjoining neighbour and agreed the details before work started. Slough Borough Council Building Control notified. Strip foundations to 900mm were confirmed appropriate by visual inspection of the existing foundations during preliminary groundworks — good firm gravel sub-soil beneath the topsoil, no made ground issues.

The Build

Groundworks excavated, foundations poured at 900mm. Drainage: the existing kitchen waste run was extended under the new slab to the existing stack. The outer leaf of the extension was built in Ibstock Anglian Mixture facing brick — a close match to the original 1930s brick still in good condition on the rear elevation. Inner leaf: 100mm Thermalite Turbo blocks with full-fill Rockwool RWA45 insulation. The roof pitch was matched to the existing rear slope — a 30-degree pitch in Marley Eternit Mendip concrete tiles in Smooth Grey, matching the existing rear slope. The structural opening from the existing kitchen into the extension was formed using a 150x75 UC RSJ on padstones. Lead soakers and stepped flashing at the junction with the existing rear wall. First-fix electrics: kitchen lighting and socket circuits.

Materials & Specification

Facing brick: Ibstock Anglian Mixture. Inner block: Thermalite Turbo 7N. Cavity insulation: Rockwool RWA45. Roof tile: Marley Eternit Mendip Smooth Grey. RSJ: 150x75 UC section. Lead: code 4 sheet lead soakers and flashing.

The Result

The extension added 14 square metres, transforming the kitchen from a cramped galley into a practical kitchen/dining room with bi-fold doors to the garden. The pitched roof and brick match make the extension indistinguishable from the original house on the rear elevation — a deliberate choice by the client who wanted the addition to look as though it had always been there.

Project Photos

Strip foundations and drainage — rear extension Slough

Strip foundations and drainage — rear extension Slough

Pitched roof structure with matching tiles — Slough rear extension

Pitched roof structure with matching tiles — Slough rear extension

Completed rear kitchen extension — Slough SL1

Completed rear kitchen extension — Slough SL1

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Project FAQs

Did this need planning permission?

No. A 3.5m rear extension on a semi-detached property exceeded the standard 3m permitted development limit, so it was carried out under the Neighbour Consultation Scheme, which extends this to 6m. We confirmed this at the initial visit.

How important is brick matching on a 1930s property?

Very. 1930s Slough properties typically used a distinctive orange-red facing brick. An extension in the wrong brick stands out immediately. We spent time identifying the closest current production brick to the original before quoting.

How long did the project take?

10 weeks on site.

Why Choose Berkshire Bespoke Builders

  • ✓Owner-managed — Pindi Sahota is on site and managing your job personally
  • ✓32 years on the tools — time-served builder, 25 years fitting bespoke kitchens
  • ✓Fully insured — public liability and employer's liability on every project
  • ✓Fixed-price written quotes — itemised by material and labour
  • ✓Building regs managed — we submit applications and attend all inspection stages
  • ✓Based in Bracknell — covering all of Berkshire. No travel surcharges or delays

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