I had a sectional garage installed in sept this year and its fantastic... no condensation or any problems like that at this point. I bought mine off a company called Nucrete and they were about £1500 cheaper than companies like compton.

Its a nice looking garage with georgian door etc and has PCV everything so its maintenance free. Im just sorting the electrics out in it at the mo but the only slight problem you have is mounting things to the walls as technically you are not allowed to drill into the concrete. You can buy clips which allow you to fit batons or line it with plaster board.

Defo check out NUCRETE as service is fantastic

This one is mine the day it was built....

its not massive but a respectable 11ft wide by 19ft long.





I did go a little overboard with base, I dug a 2ft wide trench around the perimeter which was about 18" deep in places but after doing that i decided to hire the paddys out who were digging the footings for my house extension as they had a mini digger. So the base is a depth of 18" all over which is way way over what you need. The ammount of concrete it used was amazing (and expensive) and if it ever cracks bearing in mind it had steel reinforcements then I will gladly eat my hat.