29 7 Questions You Should Ask Eight: Here are some questions to consider when choosing a type of foundation. Do you require a permit in your municipality? A permit is generally required if the structure is meant to be permanent or more than 100 square feet. The guidelines around permits vary according to munici- pality. Even if a permit is not required, it is still a good idea to follow local guidelines and call before you dig. Will you require engineered drawings? BC Greenhouse Builders is one of the few greenhouse manufacturers that can provide job specific sealed engineered drawings that will be required in most cases where a permit is necessary. Where is your water access and do you want to incorporate a sink? If it fits within your budget, a sink is very handy in the greenhouse. Clean up and sterilizing garden tools