Sometimes no! Here at Lewis Visuals we are well versed in the jungle of planning permission and permitted development. Below we’ve complied a guide to everything you can build without planning permission.

Whether you are simply exploring options or looking to carry out major works on a new property you’ve just invested in- it never hurts to explore the vast scope of permitted development.


What is permitted development?

Putting it simply: Its certain types of work you can carry out on your home that don’t require you to go through the tedious task of applying for planning permission. It applies to houses and homes except for flats, maisonettes or other buildings.

There are certain restrictions in place for areas classed as ‘designated areas’ they refer to things such as:

  • Conservation areas
  • National parks
  • Area of Outstanding Natural Beauty (to keep the WOW factor!)
  • World heritage sites
  • Norfolk/Suffolk Broads.


Original Dwelling: The original house as it stood on 1st July 1948

Principle Elevation: The ‘front’ of the house. The side of the house that faces onto a highway back in 1948. Usually the one with the front door- however this may have changed over time



The planning guidelines state that all new extensions/modifications are in keeping with the existing building and do not exceed 50% of the total area of land around the original building (including out buildings and sheds are included in the 50%).


Single Storey Rear Extension:

Detached dwelling: Depth 4m or 8m* Max height – 4m*

Semi-detached or terraced dwelling:  Depth 3m or 6m*, Max height 4m*

 * From May 2013 until 30 May 2019 a single storey extension can be larger than allowed up to 6m/8m to the rear. Subject to local planning notification.

*If extension is within 7m of rear boundary or 2m from side boundary, max height is 3m.


Single Storey Side Extension:

Detached dwelling: Max ½ the width of the original dwelling. Must be single storey, with a max height of 4m

Semi-detached dwelling:  Same as detached dwelling.





Two storey rear extensions:

Detached dwelling: Max depth 3m. Also, must have matching eave height and pitch, additionally cannot exceed existing ridge height.*

Semi-detached or attached dwelling: Same as detached dwelling. *

* The extension cannot be within 2 metres of the side boundaries and 7m to the rear boundary.



Loft Conversions:

Detached dwelling: A maximum volume allowance of 50m3 additional roof space.

Semi-detached or attached dwelling: A maximum volume allowance of 40m3 additional roof space.

Limitations under permitted development:

  • No extension beyond the plane (slope) of the existing roof that is on the principle elevation.
  • Extension cannot be higher than the existing roof.
  • Any side facing windows are to be obscure glazed and openings to be 1.7m above the floor
  • Roof extensions are to be set back as far as practicable min 20cm from original eave.
  • Verandas, balconies or raised platforms are NOT permitted development.


Porch extensions:

  • Ground floor area (measured externally) max 3m2
  • Max height 3m above ground floor
  • No part of porch is within 2m of boundary.





NB: Each council has varying local plans in place, so it is worth checking with individual councils planning department to find out more or call us on 01252 714 985 for a free consultation.

We would be happy to help!

Lewis Visuals



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