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Devonport Road – Basement flat retrofit


This project was a basement flat retrofit. greentomatoenergy was engaged by the client to upgrade and extend a solid wall Victorian flat to a low-energy standard.

Engineering design at design stage and on-site support during construction was provided. We specified improvements to the building fabric envelope, designed the heating system and produced full designs for a mechanical ventilation system (MVHR).

High performance internal insulation with an airtight layer (to reduce ventilation losses) and a water vapour resistant layer (to avoid condensation issues) were used. All the windows and the extension‘s glazed roof were highly efficient triple glazed units.

  • The extension's glazed roof is triple-glazed
  • Triple-glazed roof for energy efficiency
  • OSB for airtightness
  • OSB for airtightness membrane
  • Energy figures shows a vast improvement for the London eco home