ABOUT PSi Premier Service Installations was formed 18 years ago by four Director’s, with a combined industry experience, over 140 years. To-date, the company is enjoying a steady growth within the industry. We continue to look to develop a good working relationship, with all our clients and are looking at innovative ways, to do so. For 2016, PSi has recently renewed is accreditation with the CHAS scheme (now in our 3rd year), and now also accredited with Constructionline, helping us move forward within the plumbing and construction industry and become acquainted with other major clients.