House Extension Giffnock | Single Storey & Rear Extensions G46

Extension Options in Giffnock

Single-Storey Rear Extension — most common in G46

Giffnock’s post-war detached and semi-detached stock typically has generous rear gardens and traditional cavity wall construction — ideal for a straightforward rear extension. A 20–30m² extension creates a large open-plan kitchen-dining-living space with bifold doors to the garden. Most qualify as permitted development without planning permission from East Renfrewshire Council.

Open-Plan Kitchen Extension

Combining a rear extension with the removal of the existing kitchen/dining wall (steel beam installation) is the most transformative project we carry out in Giffnock — turning a 1960s cellular ground floor into a modern open-plan family space.

House Extension Cost in Giffnock 2025–26

Type	Cost Inc. VAT	Time
Single-storey rear (20m²)	£48,000–£72,000	12–16 wks
Single-storey rear (30m²)	£70,000–£108,000	14–18 wks
Two-storey	£90,000–£142,000	20–26 wks

Planning & Building Warrant — East Renfrewshire Council

Giffnock is in East Renfrewshire. Single-storey rear extensions up to 4m (detached) or 3m (semi) typically qualify as permitted development. A building warrant from East Renfrewshire Building Standards is always required. We handle the full warrant application and obtain your completion certificate.

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