Where my existing 9ft wide asbestos garage is I'd like to build a new one
from brick & rosemaries.
The plot is narrow at the front and wide at the back (culdesac plot!). I
want the garage as big as possible so want to come forward into the narrow
frontage as much as possible and still retain independent rear garden
access. Now my garage will end up wedge shaped, so I'm thinking a tiled
front roof and sloping low pitch behind this is also to avoid interference
with a low half landing window.

The real question here is how narrow can the garage be at the front? I
notice doors seem to be minimum 7ft, can you get them smaller? What extra
width must I have to encorporate front pillars and door frame?

Any suggestions as to alternative approaches?

Foundations...
The land currently has old hard standing that is in good nick. It is built
up by a retaing wall and infilled. Can I use this by cutting strip
foundations with circular diamond saw? Or must I break the lot up? God knows
how deep it is and how many skips it would take - I'm guessing a lot! so I'd
like to avoid too much expense and work here. I'll likely wish to screed it
so how thick must that be on existing? Too much and it'll go too high (DPC!)
So will then need to break a little up.
I never want to build on top of it, so no need for steroidal foundations.
I've seen how little extra next doors went for when they did that!

--
Mike W