Building more than one home from the purchase of any one single license is an infringement of copyright.

It is illegal to create construction drawings of home designs found in any plan book, electronic files or on the Internet
It is also illegal to copy a constructed home that is protected by copyright, even if you have never seen the plans for the home.

Plans and blueprints cannot be copied or reproduced unless PDF Reproducible Sets or AutoCAD files are purchased.

Determining and complying with all applicable codes is your responsibility. Manufacturer instructions should be followed for all materials, appliances, and systems. Heating/air conditioning layouts, plumbing pipe layouts, and electrical wiring layouts are not included. Consult a local mechanical contractor for systems suitable for local climate conditions.
Additionally, stock plans do not have a professional stamp attached. If your building department requires one, they will only accept a stamp from a professional licensed in the state where you plan to build. In this case, you will need to take your house plans to a local engineer or architect for review and stamping.