I need my garage roof replacing - Roofing (Flat) job in Belper, Derbyshire

Job description

the garage is attached to the house and is approx 18ft by 9ft the present roof is of asbestos.i would like the replacment to be boarded and felted.so it is safe to walk on.at least one of the beams needs to be replaced. i would like the work done asap.