Your software is not set up very well for the service industry. One of the most basic issues we have is your system has a billing address and a shipping address. as a service industry we never have shipping addresses, we have billing addresses and service addresses. I see no way in your software to change these headings or data types. When sending invoices from your software it causes confusion with our customers.
If this were my database I would add a service address for the service industry and possibly a project address for the construction industry. Then in the user settings allow the user to turn on and off the type of addresses they need for their business.