Adding a fourth storey

Daisy and Oliver Bourne extended their Victorian home by adding an additional storey to the property offering them the luxury of a cinema room and additional bathroom

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When Oliver and Daisy Bourne married, they planned to move from their London flat and find a house more suitable for starting a family.

The end-terrace property they eventually chose stands in a secluded cul-de-sac and, having already benefited from a stylish, recently completed kitchen extension, offered further potential to convert the loft – particularly as the roof was leaking and needed replacing anyway.

‘The house had what’s known as a London roof, sloping down to a valley gutter running along the centre of the building,’ explains Oliver.

‘This butterfly shape means you can literally slice off the roof and then build a whole extra floor with a flat roof and no sloping internal walls. We knew it would create a really worthwhile space.’

Fact file

  • The owners: Daisy Bourne and her husband Oliver live here. The couple are both lawyers
  • The property: A four-bedroom, four-storey, Victorian end-terrace house
  • The location: Clapham Common, London
  • What they spent: The couple bought the house in 2011 for £845,000, and have spent £55,000 renovating it. The property has recently been valued at around £1.35million

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The costs

Loft conversion£40,000
Plastering, wiring and plumbing£5,000

Design tip

A new mansard roof with an 80-degree pitch to front and rear, plus dormer windows set between raised gable walls, will allow the creation of an additional storey of almost the same proportions as the floor below.