SEE BOB'S ANSWER - loft
plan on building a loft in a 20X24 room with a height of 20 feet sloping down to a side wall height of 10 foot. Are there plan for this or any suggestions.
Depending on the pitch of the roof your headroom for this loft area can be quite limited so keep this in mind when designing. Also be aware of the overall impact the loft can have on the space below. Limit the loft space to 50% or less of the total area. Are there skylights? Will there be cripple-walls. How will the floor load be carried? If you don’t know the answers here then you’d better enlist a designere or architect to help you get it right. Good luck with your project!