At Postma Custom Building we take pride in creating beautiful and functional buildings.. We work with customers to ensure complete satisfaction. Tell us what you are looking for and we take care of the rest. We love what we do and you will too! For any question or enquiry, please call us at 519-482-1770. Registered Tarion Home Builder - for 20 years Jeff has provided new home warranty protection. To be a Tarion builder you must meet educational, technical and financial criteria.