i have a job to make new stairs down a slope. the old stairs are about measure 2-1\2ft. across and have a small raise on either side. there are about 10 on first landin and 6 on last landing they are in good condition but small. i need ideas on what to do and cost to charge. i have the skill just not sure if i should knock sides off and extend or if i have to do all new. can someone point me in the right direction please.