Lipa - Wood & Stone Work The price really depends on few different things. Is the space already open or does it require mayor reframing and dry walling? The space under this staircase was already open and there was nothing in the way of the installation. Another thing that will effect the price is the materials used for construction. Cases and drawers can be made out of particle board or plywood. For the doors I would recommend going with plywood, bamboo ply or solid wood. For proper raised panel doors wood is the only option. Because these kind of built ins are always custom, design and plan drafting needs to be added as well. Depending on all these factors the price can range from $4500 to upward of $10000.

nena8065 Thank you for all your responses, they have been very helpful. Can't wait to get this project started.

Lipa - Wood & Stone Work I used 100-200 lbs full extension drawer slides that I purchased at www.leevalley.com.
http://www.leevalley.com/en/hardware/page.aspx?p=43616&cat=3,43614&ap=1

The largest pull out with coats has 4 200 lbs slides. The cabinet is fastened to the framing under the stairs.

davebass Thanks for your response and sorry for not replying sooner. Can now progress with project. Thanks again!