I looking at upgrading a twinplex ( one unit up, one down ). I will changing from the Service Point on down. New SE conductors, double meter, two new 100 amps, in basement. I need to bring up to code this whole place. In the basement that means GFCI receptacle for washer, new dryer receplacle, switch and two lights. Each unit has a small fuse box ( four fuses ) these have to be changed. I looked around the units and told owner that any switch or receptacle that was not code would have to be changed also. These are small units living room, bath, small kitchen, two small bedrooms. What do think I should charge? I never done anything but single dwellings. I am thinking $4500.