We take the time from the start of every project to see that construction plans – and the whole process – will be right for the users and then we build to the highest standards in every detail. The result is a home or workspace that helps people be their best.
This focus on the client is no more seen than in our construction projects specializing in accessible living. We’ve gained a deep knowledge over the years of the best building techniques and features for barrier-free living and the latest innovations for what’s possible. Long before it was required by law, we've been building beautiful accessible spaces that can truly be enjoyed by anyone, regardless of their age or physical limitations. We care very much about the people we work for.
We strive to be the renovation partner homeowners trust most - delivering a seamless, transparent experience with enduring quality that sets us apart in the industry.
We strive to be the renovation partner homeowners trust most - delivering a seamless, transparent experience with enduring quality that sets us apart in the industry.
Serving Oakville, Burlington, Hamilton, Grimsby, St. Catharines, Niagara, Brantford, Haldimand area.
For over 40 years, Peter and JoAnne Ostermeier built Diamond Contracting with a mission to restore independence, dignity, and comfort through accessible renovations. Known for integrity, compassion, and craftsmanship, the company has helped countless families create barrier-free homes. As Peter transitions into retirement, he’s partnering with Justin VanAndel to carry forward Diamond’s legacy—combining trusted experience with fresh leadership and the same heartfelt commitment to clients. Today, Diamond continues to offer both custom home renovations and additions and accessibility-focused renovations, delivering every project with care, quality, and respect for the people they serve.
Real experiences. Real trust. Discover why homeowners across Ontario choose Diamond Contracting.
Brigitte C
Diamond Contracting is a very professional and well-run company. Peter, especially, is an excellent project manager. He kept us well-informed. All workers who came to the house…
Jon Kingma
We are using Diamond Contracting for our home renovation in order to make accessible wheelchair accommodations. We have enjoyed our experience so far with Diamond very much! The…
Doug Haynes
Diamond contracting did accessible bathroom for us and a full accessible kitchen for us Peter the owner. is very fine gentleman Easy to work with. And very professional. His…
Harry Bower
Diamond Contracting completed a terrific bathroom renovation on our "forever" home. From sales to completion Diamond's representatives were professional, polite and sincere in…
