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  • Neil Harrison

So, do you need planning permission for your Home Extension... or not?

Updated: Jul 8, 2023

If you are planning or thinking about a new home extension for 2019 you may possibly be pondering your need for planning permission - when you need it .... when you don’t and haven’t things changed recently, didn’t I read somewhere?

We at Mint of course know all the ins and outs of the current situation and requirements reference planning for that exciting new home extension next year, and we are, of course, as always, here to help! For sure, planning regulation can be complex and certain pitfalls can catch one out from time to time.


So, here, from the always informed Home Owners Alliance, is a succinct and useful schedule of guidance and distilled key facts as to what is needed with regard to planning permission when you get down to building your new 2019 home extension.

permitted development

First, an addition or extension to your home is generally considered to be permitted development, and the good news is of that if it falls into the permitted development category, you won’t need to go through the hassle of getting your planning permission sorted


These days for sure, you can avoid planning permission as long as your extension meets certain criteria is terms of size, location and siting. Your extension can ‘pass’ on a planning permission as permitted development as long as :-

a. Your extension is no more than half the area of land around the original house (curtilage). The “original house” is seen as it was in 1948; after this date how it was newly built.

b. Your extension is not forward of the principal elevation or side elevation onto a highway

c. Your extension is not higher than the highest part of the roof.

d. In the case of single storey extensions, it must not extend beyond the rear wall of the original house by more than three metres if an attached house or by four metres if a detached house.

e. The maximum height of your single-storey rear extension is not higher than four metres.

f. Extensions of more than one storey don’ t extend beyond the rear wall of the original house by more than three metres

g. Side extensions are single storey with maximum height of four metres and width no more than half that of the original house

h. Two-storey extensions are no closer than seven metres to rear boundary

i. The materials are similar in appearance to the existing house

j. Your extension does not include verandas, balconies or raised platforms

k. Any upper-floor, side-facing windows are obscure-glazed and any opening is 1.7m above the floor.

l. Conservatories are categorised as the same as any other extension, as set out above.

Conservation areas

Take note though that different rules apply to flats and maisonettes and there are also specific planning restrictions likely to apply for designated areas such as Conservation areas and if your property is listed.

So, if any of these matters may affect your plans call us at Mint and we will advise or be sure to check with your Local Planning Authority.

other ‘ins and outs’

Check back here again shortly to get more lowdown from The HOA regarding planning permission rules and ‘ ins and outs’ covering such as garden sheds and outbuildings, paving, indoors changes, trees and hedges and even turbines and solar panels too!

Whatever your project plans, feel free to request your no obligation meeting to plan the improvement , refurbishment or extension of your home in the near future.

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