2026 Prices

Single Storey Extension Costs in London

Ground floor extension to increase living space - local pricing for Greater London.

Estimated Cost Range
£36,250 – £72,500

per project • 10-16 weeks

Standard
£36,250 - £72,500
Premium
£72,500 - £145,000

About Single Storey Extension in London

Considering a Single Storey Extension project in London? Knowing the true costs beforehand is crucial for planning. Our calculator uses London-specific pricing data to deliver accurate estimates.

In London, Single Storey Extension usually costs from £36,250 to £72,500. This includes the regional labour rates and material costs specific to Greater London.

What's Included

  • Architectural drawings and planning
  • Groundworks and foundations
  • Walls, roof and structural work
  • Windows and external doors
  • Electrical and plumbing first fix
  • Plastering and second fix
  • Basic decoration

Price Factors

Knowing why prices differ helps you evaluate quotes fairly. In London, labour costs, supply chains, and job requirements all affect pricing.

  • Extension size (per square metre)
  • Foundation type required
  • Roof design (flat, pitched)
  • Window and door specification
  • Internal finish requirements
  • Connection to existing structure

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