The front section of our garage roof is the one remaining flat roof on
the house and is starting to bubble so I'm thinking of replacing it with
a pitched roof.

The current shape is a trapezium and so I'm concerned as to how to cope
with the side which creates the narrowing. Do I follow the current shape
and have to cut tiles to follow the narrowing, or do I create an
overhang to 'lengthen' the narrow end and make the roof rectangular?

Or something else?

Image at http://www.spinningweb.net/roof/roof.jpg if the above makes no
sense. Approximate dimensions a
long edge against existing wall - 12' 6"
narrowest edge - 4'
other parallel edge - 6' 9"

TIA

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F