I was very pleased with the build quality of this Lewis 6'x4' shed. The frame and boards are very substantial and it went together without major problems. A few minor improvements could be made: in a couple of places nails had missed the frame and were sticking out dangerously inside the shed; the sawn windowsill was extremely rough and splintery; it was strange to use a piece of groved timber as part of the window frame; the screws supplied for the roof are too long and penetrate through the roof boards and right through the wall timber to project inside (I replaced them with shorter ones). I mention these not to deter anyone from buying but hoping that they can be rectified for others in future. Overall a brilliant shed that I am very pleased with.