Why are HVAC, plumbing and electrical plans not provided?
Due to regional variations, local availability of materials, local codes, methods of installation, and individual preferences, it is impossible to include much detail on heating, plumbing, and electrical work on your plans. The ductwork, venting, and other details will vary depending on the type of heating and cooling system (forced air, hot water, electric, solar) and the type of energy (gas, oil, electricity, solar) that you use. These details and specifications are easily obtained from your builder, contractor, and/or local suppliers.