One Group Design + Build

One Group Design + Build is a luxury design and build firm proudly serving Markham, Ontario and surrounding areas. Founded from One Design’s success in high-end interior design, One Group was created to simplify the custom home building and renovation process. We offer a seamless, one-stop solution for luxury home design, custom builds, and full-scale renovations—bringing everything together under one trusted team. Our integrated approach reduces stress, improves efficiency, and gives homeowners greater control from concept to completion. At One Group, we deliver refined craftsmanship, thoughtful design, and a premium experience—so you can build with confidence and ease.