Home Counties Design



Home Counties Design




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.





*  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

     construction drawings.


*   If Permitted Development is refused you’ll need to make a Planning Application.