Staircase Renovation Ideas Diy Style . Approximately $240 to $1,100 per post. If your goal is to wow your guests, replacing your old stairs with a hanging stair can achieve that effect. Staircase ideas design and layout ideas to inspire your own staircase from www.pinterest.com Full carpeting or stair runners. For most projects, newell posts have the biggest impact on the overall staircase. If your goal is to wow your guests, replacing your old stairs with a hanging stair can achieve that effect.