"Treehouse Masters" is set in Washington State USA (where they have VERY big trees), and features professional treehouse builders strutting their stuff. Seems like a cross between extreme 'Grand Designs' and 'Axe Men', with large structures up to 250 feet up giant specimens. The one I'm watching now is aimed at containing a wedding reception, up a tree, with a honeymoon suite. Those Americans like to do things big.
No mention so far of the man from the Planning Department giving them grief

Link here to their website with lots of pics and video clips;
http://animal.discovery.com/tv-shows/treehouse-masters/videos/whats-in-store-on-treehouse-masters.htm