Bungalow rear extension.
See current and planned drawings attached. (sorry not to scale
)
Questions:
If I limited the rear extension depth to 8m, would this fall under 'Prior Approval' permission? Is there a width restricted for prior approval?
If I am correct the permitted development will only let me go up to half the width of my "original" property? This is 6m (12m total as there was a extra garage built at a later date to make up to 15m)
I have a drop down from the back to my garden of approx. 0.85m. Obviously garden will have to be raised, will this cause an issue?
for example:
for permitted development online portal states..
"There are height restrictions but they boil down to a single storey extension not being higher than 4m in height to the ridge and the eaves".
What would be classed as the starting point?
Other notes from the portal:
8. If the extension is within 2m of a boundary, maximum eaves height should be no higher than 3m to be permitted development.
9. Single-storey rear extensions must not extend beyond the rear wall of the original house* by more than 4m if a detached house; or more than 3m for any other house. Where not on designated land (Article 2(3)) or a Site of Special Scientific Interest, this limit is increased to 8m if a detached house; or 6m for any other house. Find out more.
10. Maximum height of a single-storey rear extension of 4m. 11. Maximum eaves and ridge height of extension no higher than existing house

See current and planned drawings attached. (sorry not to scale
Questions:
If I limited the rear extension depth to 8m, would this fall under 'Prior Approval' permission? Is there a width restricted for prior approval?
If I am correct the permitted development will only let me go up to half the width of my "original" property? This is 6m (12m total as there was a extra garage built at a later date to make up to 15m)
I have a drop down from the back to my garden of approx. 0.85m. Obviously garden will have to be raised, will this cause an issue?
for example:
for permitted development online portal states..
"There are height restrictions but they boil down to a single storey extension not being higher than 4m in height to the ridge and the eaves".
What would be classed as the starting point?
Other notes from the portal:
8. If the extension is within 2m of a boundary, maximum eaves height should be no higher than 3m to be permitted development.
9. Single-storey rear extensions must not extend beyond the rear wall of the original house* by more than 4m if a detached house; or more than 3m for any other house. Where not on designated land (Article 2(3)) or a Site of Special Scientific Interest, this limit is increased to 8m if a detached house; or 6m for any other house. Find out more.
10. Maximum height of a single-storey rear extension of 4m. 11. Maximum eaves and ridge height of extension no higher than existing house


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