Growing up or out in Markham
A home addition or second storey is the biggest structural change most homeowners will ever make to a property. It's different from a kitchen or basement remodel because it touches the building envelope, the foundation or roof structure, and often the permit process with the City of Markham. Whether you're adding a ground-floor extension for a bigger kitchen and family room, or lifting the roof to add bedrooms above an existing bungalow-style home, the work involves structural engineering, new footings or reinforced framing, and coordination between a general contractor, an architect or designer, and trades for electrical, plumbing, HVAC, and insulation.
We've looked at 6 companies in this category that handle additions and second-storey builds in Markham. Some specialize in full design-build packages, others focus on the construction side and work alongside your own architect.
What to look for before signing a contract
Ask to see a portfolio of completed additions, not just kitchens or bathrooms, since structural work carries different risks. Confirm the company pulls permits under its own name and carries WSIB coverage and liability insurance. A serious contractor will walk you through how they plan for unexpected findings, like an undersized foundation or old wiring, before work starts, and will put a change-order process in writing rather than handling surprises verbally.
How our scoring works
Our rankings weigh verified reviews, licensing and insurance status, how long a company has operated in the Markham area, and the consistency of project types they handle. See the full breakdown of criteria on our methodology page, and check the ranked guide to renovation contractors in Markham for how these 6 firms compare against the wider field.
