A detached garage is its own building project, not an add-on. It needs a proper foundation (poured concrete slab or frost walls, which matter a lot given Thunder Bay's frost depth), framing, roofing, siding to match or complement the house, and usually a service door plus one or two overhead doors. Most homeowners here are building for a second vehicle, a workshop, snowmobile and ATV storage, or a combination of all three. Some projects also add insulation, electrical, and even in-floor heat for a heated workshop space, which changes both the cost and the permitting involved.
Before hiring, ask about footings and frost protection specific to your lot, whether the quote includes permits and site grading, how they handle snow load requirements on the roof trusses, and what the timeline looks like once concrete is poured (curing time matters in our climate). Get a firm number for the full build, not just materials, and ask to see a recent local garage they built rather than just photos of finished interiors.
With 15 builders working in this category, quality varies more than price alone suggests. Our scoring weighs verified customer feedback, how consistently a builder shows up in local project mentions, and business fundamentals like licensing and responsiveness. See the full breakdown and side-by-side comparison in our ranked guide to Thunder Bay garage builders, and read how we score builders on the methodology page.
