Decrepit porch removal and replacement with canopy.

Hi, We have a small, flat-roofed, decrepit front porch with a sliding glass door and fixed glass side panel. The sliding door is clunky and no longer slides closed properly. Also, its lock broke long ago so it no longer even locks. The porch itself is old with interior and exterior paint flaking etc. Rather than attempt to fix all its faults, we wondered how much it might cost for someone to remove the whole thing for us and put up a smart but much smaller canopy-type covering in its place.