Glasgow Home Extensions
Extension Costs

Glasgow Extension Costs 2025

Real per-m² rates by project type, with the local uplifts and surprises that catch Glasgow homeowners out.

2025 Glasgow per-m² rates

  • Rear extension (standard): £2,000–£2,400 per m²
  • Side return: £2,200–£2,500 per m²
  • Wraparound: £2,400–£2,700 per m²
  • Loft conversion (Velux): £1,300–£1,500 per m²
  • Loft conversion (dormer): £1,800–£2,100 per m²
  • Garage conversion: £1,100–£1,400 per m²
  • Orangery / lantern roof addition: £2,500–£2,900 per m²
Glasgow uplifts to factor in
Conservation areas: +15%. Tenement / flat structural work: +20%. Premium specification: +25%. Architectural / luxury finish: +55%.

What's actually included

Per-m² rates above cover labour, materials, structural elements, standard fit-out (kitchen prep, electrics, plumbing, plastering and standard finishes). They exclude architect fees (typically 8–12% of build cost), structural engineer (£1,200–£3,000), planning fees (£300), building warrant fees (use our calculator), kitchen units, premium glazing upgrades, and landscaping.

Cost Calculator

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Estimated cost range
£40,000 – £51,000

Includes labour, materials and standard fit-out. Excludes architect's fees, planning fees and building warrant.

How prices have moved 2020–2025

Glasgow rates rose roughly 32% between 2020 and 2023, driven by post-pandemic material shortages and labour scarcity. 2024 brought a 4% correction; 2025 is showing flat-to-slightly-up movement. We update this page each quarter.

Glasgow Extension Cost Index 2025

Live local cost data — updated quarterly with real Glasgow project values.

£2,200/m²
Average single-storey rear extension
£68,000
Average loft conversion (dormer)
+15%
Conservation area uplift
8–12 weeks
Planning approval timeline
£950–£1,893
Building warrant (typical)

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Frequently asked questions

The average single-storey rear extension in Glasgow costs £45,000–£70,000 in 2025. The 'true average' across all extension types we track is around £62,000.
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