The company you select should have a sound reputation for honesty and attention to detail. Get references for the inspector you are looking to hire and check them out.
You should make sure the company carries Errors & Omissions Insurance, General Liability Insurance, and Worker’s Compensation as protection for both the inspector and yourself.
Ask the inspector about his/her technical background and accreditation.
Certification & Training
Make sure the home inspector has formal training and is certified to do home inspections. He/she should have extensive on-going training through Home Inspection Associations.
The inspector you hire should belong to an association for home inspectors such as the Ontario Association of Home Inspectors (OAHI).