Our surveyor, whom I can recommend highly, suggested a builder who will help us do the renovations and extensions.
They measured the entire house with a special frickin lazer measuring tape, and we sketched out some of the initial designs and layouts. After a bit of to 'n fro and how the hell is the new staircase going to fit? we came up with a final plan and submitted it to the council.
That, plus other good news: our neighbour has signed the party wall agreement, so things are almost in place.
Expect a deluge of excerpts from the planning documents :-)