Loft Conversion Planning Permission in Hounslow

Planning guidance for loft conversion planning permission in Hounslow, Greater London.

Permitted Development

Loft conversions may be permitted development subject to limits and conditions set out in permitted development rights.

Volume Limit

Additional roof space must not exceed 40 cubic metres for terraced houses or 50 cubic metres for detached and semi-detached houses.

Principal Elevation Restriction

Roof extensions are not permitted on the principal elevation of a house that faces a highway.

Height Limit

The extension must not be higher than the highest part of the existing roof.

Eaves Alignment

The eaves of the extension must be no higher than the eaves of the existing roof.

Materials Match

Materials used for the exterior of the loft conversion should be similar in appearance to those used on the existing house.

Side Facing Windows

Any side-facing windows must be obscure-glazed and non-opening unless the opening parts are more than 1.7 metres above the floor level.

Balconies Restriction

Verandas, balconies and raised platforms are not permitted development.

Roof Enlargement Location

Roof enlargements must be set back at least 20 centimetres from the original eaves measured along the roof plane.

Side Roof Extensions

Side-facing roof extensions are not permitted development.

Common Reasons Loft Conversion Planning Permission Applications Are Refused

Planning applications for loft conversions in Hounslow may be refused for a variety of reasons depending on the design of the development and local planning policies.

The development exceeds permitted development size limits
The design is considered out of character with neighbouring properties
The proposal causes overlooking or loss of privacy
The development results in overshadowing or loss of light
The property is located in a conservation area with additional restrictions
An Article 4 direction removes permitted development rights

Loft Conversion Planning Permission Planning Checklist

Before starting a loft conversion project in Hounslow, homeowners should check the following planning considerations:

Whether the development falls within permitted development rules
Whether the property is located in a conservation area
Whether Article 4 directions remove permitted development rights
Whether the property is a listed building
Whether building regulations approval is required
Whether the design complies with local planning policies

Other Planning Guides in Hounslow

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