Hi clik,
I am currently building my garage in the UK - I've gone for a pit too because i'm not allowed to build higher

SO! I decided to build a 5.5x2x2 meter pit hehe
I've finished the pit now and am building the main buildings walls. I've attached a picture of it about 90% finished. Pit has an I-Beam across the long length, what i've done is to basically double the width of a standard 800mm pit, this way I will have a kind of cubby hole. The garage floor will be cast over one half of the pit!
I've also had to tank my pit. It's a real pain but I am unfortunate enough to have an underground stream going diagonally across my site

I've used the same tanking membrane they use to build artificial lakes/reservoirs/water storage tanks etc. The membrane weighs 200kg and was incredibly difficult to deal with!
I think I will post my build on the forum soon, heres what I'm building and one of the pit...
