Permitted development on an extension

rking100uk

Hi all,

I'm looking to add a single garage onto the side of my house approximately 3m wide by 7m long.

Currently there is the existing 2 storey semi detached house (6.5m x 7m) and on the side there is a 2 storey extension (3.9 x 7.4m)

I've been reading on the planning website and it says that you can add a side extension as long as it is single storey with maximum height of four metres and width no more than half that of the original house which it will be. However, I am not sure if this still counts as I there is already an extension on the house. Could anyone please enlighten me? I am also aware about the rule for permitted development about not exceeding 50% of the area around the existing house but I do not exceed this with the extension.

Secondly, if I wanted to put a double garage instead of a single garage (still single storey) but say have it 6m wide and 6m deep (not sure what the standard double garage width is) am I right in thinking I would need planning permission as the width is more than half of the original house?

I would like the extension / garage to be attached to the house as I know the rules are slightly different for outbuildings (if the garage was detached).

Thanks in advance

Doozergirl

If the original house was box shaped and the width of the house is 6.5m, you can build one extension to the side of up to 3.25m in width.

"Original house" is as built or as it stood in 1948.

As your house already has a side extension, another extension to the side would NOT be permitted development and would require PP.

rking100uk

Thanks for that, time to find an architect!

Hoploz

Doozergirl wrote: »

If the original house was box shaped and the width of the house is 6.5m, you can build one extension to the side of up to 3.25m in width.

"Original house" is as built or as it stood in 1948.

As your house already has a side extension, another extension to the side would NOT be permitted development and would require PP.

I'm detached with an extension already on one side of half the original width. Could I extend the other side under PD? In effect the house could be double the original house width then.??

Doozergirl

Hoploz wrote: »

I'm detached with an extension already on one side of half the original width. Could I extend the other side under PD? In effect the house could be double the original house width then.??

No. You can only extend sideways up to half the original width of the house. Any more than that, you're in PP territory.

It's perfectly feasible that one would be awarded the planning permission. PD rights are there to give a limited amount of freedom.

Hoploz

Doozergirl wrote: »

No. You can only extend sideways up to half the original width of the house. Any more than that, you're in PP territory.

It's perfectly feasible that one would be awarded the planning permission. PD rights are there to give a limited amount of freedom.

Hmm sadly PP not possible due to green belt allowing only a 30% increase, which has already been done So I only have PD still to exploit. Have to be on the back then.

System

Hoploz wrote: »

Hmm sadly PP not possible due to green belt allowing only a 30% increase, which has already been done So I only have PD still to exploit. Have to be on the back then.

You should check that you haven't had permitted development rights removed first.

Doozergirl

Hoploz wrote: »

Hmm sadly PP not possible due to green belt allowing only a 30% increase, which has already been done So I only have PD still to exploit. Have to be on the back then.

Green belt PD rights are different to the rest of us and can vary slightly between local authorities.

The 30% is the allowed increase on the total footprint and applies to all extensions. ie. if your side extension added 30% to the total footprint, anything else is subject to planning permission.

It's always a good idea to apply for a certificate of lawful development when you're in greenbelt as it's quite easy to fall foul of PD rights.

Your local council may well have 'supplementary planning guidance' on the extension of dwellings in the greenbelt. I'd find it and read it.

Hoploz

the_r_sole wrote: »

You should check that you haven't had permitted development rights removed first.

Class e only has been removed, ie outbuildings. Am reading the other thread about the container

Yes we need to speak to planning really, but hoping we can do something.

bgm_co

Doozergirl wrote: »

No. You can only extend sideways up to half the original width of the house. Any more than that, you're in PP territory.

It's perfectly feasible that one would be awarded the planning permission. PD rights are there to give a limited amount of freedom.

Hi Doozergirl, this is interesting. Maybe a grey area?

I interpret this differently. In the GPDO Order 2015 it states:-

A.1 Development is not permitted by Class A if—
Article 3
(j) the enlarged part of the dwellinghouse would extend beyond a wall forming a side elevation of the original dwellinghouse, and would—
(i) exceed 4 metres in height,
(ii) have more than a single storey, or
(iii) have a width greater than half the width of the original dwellinghouse

It doesn't however seem to state that it is only possible to extend half a width as the grand total. It mentions "beyond a wall forming a side elevation".

Doozergirl

bgm_co wrote: »

Hi Doozergirl, this is interesting. Maybe a grey area?

I interpret this differently. In the GPDO Order 2015 it states:-

A.1 Development is not permitted by Class A if—
Article 3
(j) the enlarged part of the dwellinghouse would extend beyond a wall forming a side elevation of the original dwellinghouse, and would—
(i) exceed 4 metres in height,
(ii) have more than a single storey, or
(iii) have a width greater than half the width of the original dwellinghouse

It doesn't however seem to state that it is only possible to extend half a width as the grand total. It mentions "beyond a wall forming a side elevation".

Looks like you're right. There are appeal decisions that allow the second extension on the basis that the legislation is silent. Seems that many councils interpret it as meaning one extension of half width but it can be won on appeal.

I've posted this before, but these are top 10 monstrosity you can build using PD loopholes:
https://planningjungle.com/wp-content/uploads/Part-1-of-the-GPDO-The-10-Worst-Permitted-Development-Loopholes.pdf

I'm pretty certain that Hoploz's green belt location will trump the loopholes.