Rebuild old extension a littler bigger, no previous planning permission

Casas00

I have a small rear extension being used as a shower room. It has a small L shaped space around it. The sloped roof extended from the extension to the garden wall so part of that L shape is a shed.

We didn't want this shed so on removing the roof between the extension and the garden wall, and digging up this L shape concrete path (as it was higher than inside floors) we discovered this extension has no foundation. It was built directly on top of soil/clay. It looks unstable and the external render has a lot of cracks in it.

So we've decided to knock it down and rebuild a slightly bigger one, consuming this L shaped path so its about a metre longer to the rear and slightly under a metre wider.

I have searched my local authority planning permission records and there seems to be no planning permission. The house was built in the 1900's and my builder has advised me the extension is old, majority of the houses in our street have them and I didn't even find planning permissions for my neighbors ones either. Obviously hasn't got buildings regs certificate either.

Is it correct in thinking if the extension was built prior to 1948 then it counts as part of the original house this I can get away with permitted development? Because if not part of the original house then it's probably already longer than 3m to the rear from the house, thus used up my permitted development allowance? Am I understanding this correctly?

I checked the title plan and it does show the extension, actually it shows the shed too as part of the extension. Not sure if that means anything?

I would like to post some pics of the title plan but as a new user I am not permitted.

Sorry for the wall of text. Basically my question is do I need planning permission? How can I tell how old my extension is? Based on my title plan, the building won't be any longer, just a little wider, but kept in line with the current house, not near the boundary.

Thanks for any input

rajeshk4u

I can't answer your question.

When it comes to selling your home, you will need to have appropriate paperwork and they will ask to see it.

Casas00

Well I've only just bought this house 3 months ago, it was never mentioned. I don't intend on selling either.

parking_question_chap

Yes I believe the term original house means as it was built or as was in 1948. (Thanks Google)

Interesting question you pose. I guess it comes down to this:

If as soon as you knock down the current pre 1948 extension, does the new back of the house become the "original" back of the house? and therefore only allowing 3 metres from there? Or is the "original" back of the house still theoretically the imaginary line you have just demolished?

Honestly think thats one for the experts. Would be impressed if anybody on here knows the answer.