Case Study

Belsize Park Gardens, NW3

Five-storey period-home transformation combining basement conversion, extension and loft works with a complete interior refurbishment package in a high-value NW3 conservation context.

Programme16 Months
Budget Band£850k - £1.1m
Core WorksBasement + Extension + Loft
ResultMajor Space + Value Uplift
Belsize Park Gardens NW3 before renovation Belsize Park Gardens NW3 after renovation

Scope & Specification

  • Full five-storey strip-back and interior reconfiguration
  • Basement conversion to habitable family and utility space
  • Rear extension and loft conversion integrated with original architecture
  • Complete electrical, heating, plumbing and joinery renewal

Timeline Milestones

  • Months 1-3: design development, approvals and technical package
  • Months 4-8: structural, shell and heavy-build phase
  • Months 9-13: M&E first and second fix, envelope and insulation works
  • Months 14-16: bespoke finishes, snagging and final handover

Budget Framework

  • Structure, basement and extension works: ~43%
  • M&E services and performance upgrades: ~22%
  • Interior fit-out and joinery: ~27%
  • Professional fees, prelims and contingency: ~8%

Delivery Challenges Solved

  • Balanced heritage-sensitive detailing with modern family requirements
  • Phased noisy works to reduce neighbour impact and site risk
  • Coordinated complex structure-to-finish sequencing across five floors
  • Delivered cohesive design language from basement to loft

Planning a whole-house renovation in Belsize Park, Hampstead or NW London?

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