Hi all,
Thanks for your responses. Apologies for not responding sooner. I didn't get a new email notification after reading the first two replies.
It appears there is room for interpretation which is good because in a sensible world, I could build my preferred design, however we are dealing with bureaucrats that love nothing more than flexing their given authority, so we have to play games of reverse psychology, meaning I'll have to submit plans for something I don't want and then modify them to what I actually want; letting them think I have conceded to their want.
Unless anyone can correct me, I am under the impression there are no hard and fast rules around PD, it looks like I will have to continue searching for a Planning Consultant that actually wants my business. That way the Planning Consultant can ratify my design and argue my case.
Laying my cards on the table:
The property in question is a detached bungalow sitting in 1/2 acre. Therefore the only "rule" that seems applicable is:
"Single storey rear extension must not extend beyond the rear of the original house by more than 3m an attached house or by 4m* if a detached house. "
*8m, subject to neighbour consultation - and as they wouldn't be able to see the extension, I can't see they can "reasonably" object.
Below is a rough sketch of my proposal. The current extensions and conservatory would come down.
Looking at the planning history for the property, a garage and small garden office were built under permitted development in 1981 and I built a 15m2 shed last year. With an 8m x 7m extension and these outbuildings, they do "not exceed 50% of the total area of land around the original house".
I am contemplating sinking a semi-basement by 800mm. This should allow a mezzanine floor to gain enough useful headroom for an "upstairs" bedroom without raising the ridge height and more importantly inside the 4m PD ridge height. My research suggest PP is required for a basement, therefore, I assume PD goes out the window and I'm stuck with the 25%.
Although the dimensions show 8x7, in all reality, I doubt I will be able to afford to extend to that size. Once I know what I can do, I can do the cost analysis and finalise the design.
To answer
@^woody^'s question, there are no paths or roads to the sides of the property.
Any input, always welcome.
Thanks
W.