ARCHITECTURAL & INTERIOR PLANNING SERVICES
Home Counties Design
OFFICE : 0208 642 3352 EMAIL : INFO@HOMECOUNTIESDESIGN.CO.UK
Built under Permitted Development
A loft extension may be built under Permitted Development if it meets the following criteria.
* The house isn’t in designated land, such as National Parks and the Broads,
Areas of Outstanding Natural Beauty, Conservation Areas and World Heritage Sites.
* It doesn’t exceed 40m3 for a terraced house, or 50m3 for a semi-detached or detached house.
Any previous roof extension has to be included in this allowance.
* A hip to gable extension is allowed providing it is set back from the eaves/gutter by 200mm.
* The loft extension roof can be no higher than the main house roof.
* You can only have a flat roof to the loft extension, ie. above a rear dormer, if there is already
a flat roof on the existing house.
* Dormers aren’t permitted on the front roof slope, only Velux style windows.
* Juliet balconies are permitted to rear dormers, but not verandas, balconies or raised platforms.
* Side windows, including Velux style, need to have obscured glazing and must not be openable,
unless their lowest edge is 1.7m above floor level.
* Chimneys, flues, and soil pipes cannot be altered or extended.
* All building materials must match the existing house.
* The existing foundations will have to be checked by the Local Authority to make sure
they can take the new loadings.
* Underpinned buildings may not be able to take increased loads.
WHAT’S NEEDED TO START?
* We’ll come to you to talk over your project, free of charge, and let you know what’s possible.
* We’ll send you an estimate of our fees and let you know what other costs are involved,
especially Local Authority charges.
* We’ll carry out a measured Survey of the existing building, and plot the surrounding area
and adjoining properties.
* We’ll draw up the Survey plans and elevations, as these are needed by the Local Authority.
* We’ll prepare Scheme drawings for you to agree, showing plans, sections, and elevations
of your proposed extension.
* We’ll prepare and submit the Lawful Development Certificate Application to the Local Authority.
* We’ll receive an Acknowledgement of the Application from the Council giving a decision date
- which is usually a minimum of 8 weeks from the acknowledgement date.
* The Planning Officer will visit your property, and your neighbours’, and take photographs
to assist with their report.
* Your Application will be considered by the Planning Department and a decision
will be received in 8 weeks.
* Once you’ve received the Lawful Development Certificate you’ll need to think about
* If Permitted Development is refused you’ll need to make a Planning Application.