How much does a prefab garage kit cost compared to custom-built in New Brunswick?

A prefab garage kit in New Brunswick typically costs 20% to 40% less than a fully custom-built garage of the same size for the materials and shell, but the total installed cost gap narrows significantly once you factor in foundation, assembly labour, and finishing. For a standard two-car garage (24x24), a prefab kit runs $12,000 to $25,000 for materials, while a custom-built garage of the same size costs $40,000 to $70,000 fully completed — but that comparison is misleading without understanding what each price includes.

A prefab garage kit from suppliers like Summerwood, Jay's Portable Buildings, or national kit manufacturers typically includes pre-cut or pre-assembled wall panels, roof trusses, sheathing, siding, roofing materials, overhead door(s), and a service door. What it does not include — and this is where the hidden costs live — is the foundation, concrete slab, assembly labour, electrical wiring, insulation, interior finishing, and permits. In New Brunswick, the foundation alone for a two-car garage costs $8,000 to $15,000 because frost walls must extend 4 to 5 feet (1.2-1.5 metres) below grade. Assembly labour for a prefab kit runs $5,000 to $12,000 depending on complexity — these kits are not truly DIY projects for most homeowners, as they require proper anchoring to the foundation, level and plumb assembly, and roof installation at height. Electrical adds $1,500 to $4,000. When you total up a prefab kit with all the necessary additions, a two-car garage lands in the $30,000 to $55,000 range fully installed — closer to custom-built pricing than the kit price alone suggests.

A custom-built garage designed and constructed by a local NB contractor typically costs $40,000 to $70,000 for a two-car detached garage, but this is a turnkey price that includes everything: foundation design and construction, framing to suit your specific lot and needs, roofing engineered for NB's snow loads of 2.4 to 4.8 kPa, siding that matches your house, electrical, overhead doors, and a concrete slab. The contractor handles permits, inspections, and coordination of all trades. You get a garage designed for your specific site conditions, architectural preferences, and functional requirements.

Where Each Option Makes Sense

Prefab kits work best for simple, detached, rectangular garages on flat lots where the homeowner wants to save money and is comfortable coordinating the foundation contractor, kit assembly crew, and electrician separately. They are particularly popular in rural NB communities where a straightforward detached garage does not need to match the house's architecture precisely. The kit approach can save $5,000 to $15,000 compared to a full custom build, primarily through standardized manufacturing and reduced contractor markup on materials.

Custom-built garages are the better choice for attached garages (which require fire separation, roof integration, and matching the existing house), garages on sloped or challenging sites, garages with bonus rooms or lofts above, and any project where the homeowner wants architectural consistency with their home. Custom building also allows the contractor to optimize the design for NB's climate — specifying proper truss engineering for local snow loads, designing drainage for the specific site, and ensuring the foundation is sized correctly for local soil conditions.

One important consideration for NB homeowners: some prefab kit manufacturers are based outside the province and their engineering may not account for New Brunswick's specific frost depth requirements, snow load ratings, and wind exposure classifications. Before purchasing a kit, confirm that the structural components (particularly roof trusses and wall framing) are rated for your specific NB location's design loads. A kit engineered for southern Ontario's lighter snow loads will not be adequate for northern New Brunswick.

Post-frame (pole barn style) construction offers a middle ground — these are built on-site using posts set in the ground or on concrete piers, with metal siding and roofing. A post-frame two-car garage in NB costs $25,000 to $50,000 and is faster to build than conventional framing. They are popular for larger garages and workshops in rural areas.

Whether you choose a kit or a custom build, the foundation and electrical work require professionals. Get quotes for both approaches from local NB contractors to compare true total costs. New Brunswick Garages can connect you with garage builders for free estimates on your project.