Do I Need Planning Permission.co.uk
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Hi

I am trying to get an idea for what might be possible under PD for a house I am looking at buying.

House has a double-storey side extension that was completed in 1993 (with planning permission).

We are looking to build a single-storey extension to the rear of the property under permitted development (as the house is on Green Belt, so PD is the only realistic option).

My understanding is that the rules about rear extensions under PD would allow me to build "back" the full width of the original house, it would not allow me to build to the "back" of that side extension as that would be considered a side extension (as it is not directly behind the original house).

I can see the rules for a side extension, but I can't see mention of whether the side extension can go beyond the rear of the original house or not, like this:

+-----------+-------------------+
|   Here?   |                   |
|           |        OK Here    |
+-----------+                   |
|           |                   |
|           +-------------------+
|  Side     |                   |
| Extension |                   |
|           |      Original     |
|           |        House      |
|           |                   |
+-----------+-------------------+

                FRONT 

Second, there is an existing detached garage that is ~ 5m away from the rear corner of the original house. If I built out 4m from the rear, this would make the outbuilding within 2m. While I can't build an outbuilding within 2m under PD ... is the PD impacted by the position of an existing outbuilding?

                                 +---------+
                                 |         |
                                 | Garage  |
                                 |         |
                       Gap 1m    +---------+
            +-------------------+
            |                   |
            |        New        |
+-----------+     Extension     |
|           |                   |
|           +-------------------+
|  Side     |                   |
| Extension |                   |
|           |      Original     |
|           |        House      |
|           |                   |
+-----------+-------------------+

                FRONT 

Thanks in advance :)

If the rear wall of the existing side extension does already sit behind thr rear wall of the original house, any rear extension on the back of the original house will require Planning.