Paisley: reroof/repair concrete panel garage and install new door frame and window in garage rear (ended)

reroof/repair concrete panel garage and install new door frame and window in garage rear

Concrete panel gARAGE APPROX 20FT BY 10FT (?) CURRENTLY HAS CORRUGATED ROOF WHICH SLOPES TO DRAINAGE PIPE AT BACK SECTION . rOOF IS LEAKING AT VARIOUS POINTS. I would like it repaired so it is watertight or roof replaced if necessary. We also need a new door frasme installed at the back of the garage. and a new window frme and window. The window and door frame are the one structure. The door itself is okay, but frame is in bad repair. I'm not sure what budget is required, so need some advice on this.
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