Complete the form The business that will create the trade waste discharge will need to fill in the form. If you are not the property owner, you will need to work with your property owner to properly allocate the responsibility for plumbing and drainage works and other property management matters. You must apply for authorisation before you engage a licensed plumber to install or modify any required plumbing or fixtures. Application process Check which form you need to complete. Read through the requirements for your industry. Complete either the new online application or select the correct PDF application form: non-complex business or complex business. Pay the fee.