How big is your patch?

My back garden is about 30 metres long and 12 metres wide. In that space there's a greenhouse, three sheds (two of which will disappear), two chicken sheds (one of which will disappear) and a summer house. The pond will go too.

We want the space for a bigger summer house that is facing the right direction for enjoying the sun in an early evening. We will convert the patio and the raised decking to a more social space with a pizza over that is covered.