Policy information sourced from Hammersmith & Fulham Planning Guidance

HS7 Residential development - windows and outlook

  • Any proposed rear extension should not worsen the outlook from any rear habitable room window located lower than the proposed extension. Depending on the circumstances of the building, either of the following will apply:
    • An extension to either the roof of the back addition or to the rear of the back addition should enable an unobstructed angle of 45 degrees to be achieved to any window to a habitable room on the ground floor of the back addition if that forms the sole window to that room. This requirement needs to be satisfied by measuring either over or around the back addition as extended (see figure 2);
    • Where there is an existing rear addition, the angle of unobstructed visibility for this purpose should not be reduced by more than 15% (see Figure 3);
    • Where no rear addition currently exists at the level of the extension then on-site judgement will be a determining factor in assessing the effect which the extension will have on the existing amenities of the neighbouring properties.
  • Any extension at the side of the back addition (being the back addition of the property as originally built) shall not extend above a height of 2 metres on the boundary with the adjoining property as measured from the ground level of the adjoining property.
    • The roof of the extension shall have a maximum angle of slope not exceeding 45 degrees (see Figure 4).
  • Any new windows should be positioned at least 18 metres from existing habitable room windows. This will be measured by an arc of 60 degrees taken from the centre of the proposed new window to ensure there is no loss of privacy.
    • If this standard cannot be met then windows should be designed to ensure that no loss of privacy will occur (see Figure 7).

For more information please see the Hammersmith & Fulham Planning Guidance