detached dormer bungalow Permitted Development

Hi
We're planning on buying a detached chalet style dormer bungalow and want to extend it under PD rules.
Basically it will have a 3m single storey extension across the ground floor which i believe is fully within PD rules.
We then want to add a rear dormer across the width of the rear and extend a small bedroom over the rear extension ... ie creating an L shaped dormer at the rear.
So effectively part of the rear extension is going to be 2 storey from the PD guidance I'm leaning towards thinking this is allowed as it would be within the following guidelines:

- Completely at the rear of the building
- Extends no more than 3 metres from the rear of the existing house
- Uses materials similar to the existing
- Is 7 metres from the rear boundary
- Does not extend above the existing ridge line

The total useable space in the building will not be increased by more than 50%

Picture and my initial sketch below...

 

That would not be p.d. as the 2-storey part would be within 2m of the side boundary.

EDIT - or it might not - can't see from the pic.

 

No i believe the 2 storey part will be more than 2 metres from the boundary (there is full width driveway) ... I've attached a front view. If not then
we are talking cm's - thinking about it - i need to avoid building over the garage so the 2 storey extension would need to be inset slightly say - 20 - 30 cm's - will we be allowed to merge the ground floor part into the garage?
we are

 

Looks like there's a step in the rear elevation? Pitched roof on the rear extension? Or flatty?

 

I think it would have to be flat to get the usable space - my 2 kids have currently both got double bedrooms in our current 4 bed semi and i don't want to unduly disadvantage them as I doubt we'll move again - the box room is just too small - if we just did a dormer across the full rear then it would still be tiny.

 

FWIW, it looks like PD to me. I think there are some technical issues with those staggered roofs, but presumably not insurmountable.

 

I'm not sure I understand how you intend to extend tbh.

Also, I have found when extending bungalows that getting a flat roof eaves no higher than the existing eaves to be problematic ie you end up with a low ceiling height in the extension.

 

But this has a really high ridgeline

 

Maximum eaves and ridge height of extension no higher than existing house.

 

it would be nice to have a better photo, from about this position, but showing all of the back of the house.

 

Not under PD.

 

I can confirm the ridgeline is ridiculously high - There are already 2 pretty good rooms up there - however little space for wardrobes due to the slope on both sides. Bedroom 2 is the room we want to extend over with to create a better sized room - we can steal room from bedroom 1 to increase the size of the upstairs bathroom (ie put a shower in it)


Thanks for the feedback

 

So you're saying that the extension cannot touch the garage?

 

Under what PD criteria do you think it can?

 

rear view courtesy of bing maps the fence line is straight all the way back but the garage is built at a weird angle ... i'll take that on board about not joining onto the garage - I take it I can get away with leaving a tiny gap between the two to satisfy the PD regs.