2026 Prices

Double Storey Extension Costs in London

Two-storey extension for significant space increase - local pricing for Greater London.

Estimated Cost Range
£65,250 – £123,250

per project • 14-24 weeks

Standard
£65,250 - £123,250
Premium
£123,250 - £261,000

About Double Storey Extension in London

Considering a Double Storey Extension project in London? Knowing the actual costs beforehand is vital for planning. Our calculator uses London-specific pricing data to provide reliable estimates.

The typical cost for Double Storey Extension in London typically runs £65,250 to £123,250. That said, final costs vary based on various considerations.

What's Included

  • Architectural design and planning
  • Structural engineering
  • Foundations and groundworks
  • First and second floor construction
  • Roof construction
  • Staircase if required
  • Full electrical and plumbing
  • Internal finishing

Price Factors

London Double Storey Extension costs range substantially based on your particular requirements. Here, we explain the main factors affecting your quote.

  • Total floor area
  • Structural complexity
  • Foundation requirements
  • Roof integration with existing
  • Internal layout and rooms
  • Party wall agreements

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