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I have done a lot more with a lot less.
Ceiling Height? I ask as my garage, 1800Sqft, is fabulous, except....... when built by the previous owner, put in a 9.5 ceiling. I will have to do surgery for a lift. Even if you aren't planning a lift now, I would engineer the clearance in an area for one.
i thinking you'll have no problem finding ways to use all that space
agreed, but if it's not an option put in an inspection pit before laying the floor slab. make sure it's long enough to get out without having to roll the car back or forward too. neil.
they won't let you do inspection pits here, don't want you dying because you left the car running and didn't ventilate . some people have done one after the garage was built. easiest way is get the contractor to pour the slab thin in the area you're planning to dig out.
They have been outlawed for a very long time.
yes, you need planning approval here in the uk for a pit too. i know guys who do the pit, then lay the slab over it with plywood sheets just an inch or so below the surface covering the pit. easy enough to open it up after inspection then. there should be a way round the choking yourself risk, like motion sensors in the pit that switch on an extractor fan one end for the whole time you're in there working along with another at the other end feeding fresh air in. shouldn't be hard to build in at the start. neil.
there are so many rules about ventilating an underground substructure, you'd never want to deal with it
Not sure if you are finishing your walls but something to consider is running conduit outside of the finished walls. It's not for everyone and we all have a different vision of the appearance inside their shop so to each his own. However this gives you access to changes in power needs if necessary without going into the walls. I am also a fan of lengthy SO cord (properly sized for the required power need) as it allows extreme flexibility and can easily be rolled up and hung on the wall.... JW