CASE STUDY · APPROVED

De-conversion of nine flats into a single family house with three-storey rear extension

Avonmore Road, Olympia · London Borough of Hammersmith & Fulham

A terraced house on Avonmore Road divided into nine self-contained flats was proposed to be returned to a single family dwelling, with a three-storey rear extension at lower ground, upper ground and first floor levels, roof terraces and replacement windows and doors. We prepared the full set of planning drawings and acted as agent for the application.

Proposed front (south) elevation shown alongside the neighbouring houses
Proposed front (south) elevation shown alongside the neighbouring houses

The site

The building is a mid-terrace house of lower ground, upper ground and three upper floors, with a front lightwell, entrance steps and decorative front balconies, and a rear garden containing an existing tree. Before the works it was arranged as nine self-contained flats.

The challenge

The scheme combined a change from nine flats to one house with a three-storey rear extension, new roof terraces on the extension and the main roof (including infilling between the chimneys and a free-standing sky box rooflight), and replacement of the front windows and doors. The street-facing changes had to sit comfortably with the neighbouring terrace, while the rear works replaced external steps and an external staircase down to the garden.

What was submitted

  1. Planning drawings (existing, demolition and proposed plans, elevations and sections)Documented the existing nine-flat layout and the proposed single dwelling over five levels, including a three-storey rear extension with aluminium double-glazed windows, roof terraces with railings matched to the original, new timber double-glazed windows and doors to the front elevation, and cycle and bin storage in the front garden.
  2. Fire protection and ventilation notes (on drawings)Showed smoke, heat and carbon monoxide detection, FD30 fire doors, a mist sprinkler system and mechanical extraction rates for kitchen, utility room and bathrooms on each floor plan.

Outcome

Approved by the London Borough of Hammersmith & Fulham on 2 February 2026.

Images and findings are taken from the documents submitted with the planning application. The full application is available on the council's planning register.

YOUR NEXT STEP

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