Do I need a permit to build a shed or gazebo in my NB backyard?

In most New Brunswick municipalities, sheds and gazebos under 108 square feet (10 square metres) do not require a building permit, but larger structures do — and all structures regardless of size must comply with zoning setback requirements for your property. The specific threshold varies by municipality, so always check with your local building inspection office before starting construction.

The general rule across most NB municipalities follows the National Building Code of Canada as adopted by the province: accessory buildings (sheds, gazebos, workshops, playhouses) under 10 square metres of floor area and not intended for human occupancy are typically exempt from building permits. However, "not intended for human occupancy" means the structure doesn't have heating, plumbing, electrical service, or sleeping accommodations. Adding any of these features — even a simple electrical outlet — often triggers a permit requirement regardless of the building's size.

For structures over 108 square feet, a building permit is required in most NB cities. In Fredericton, Moncton, and Saint John, the permit application typically requires a site plan showing the proposed structure's location, dimensions, and distances from all property lines and existing structures. The permit fee varies by municipality and project value but generally runs $50-$200 for a residential accessory structure. Processing time is usually 1-3 weeks.

Zoning setback requirements apply to ALL structures, even those exempt from building permits. Typical residential zone setbacks in New Brunswick require accessory buildings to be located a minimum of 1-2 metres from side and rear property lines, behind the front building line of the house, and a specified distance from the main dwelling. Setbacks vary significantly between municipalities and even between zones within the same city. A shed placed too close to a property line — even a small one that doesn't need a building permit — can result in a removal order from the municipality.

Additional considerations for NB backyard structures include lot coverage limits and height restrictions. Most residential zones have a maximum lot coverage percentage (the total area of all buildings and structures on the lot divided by the total lot area), typically 35-45%. Your shed or gazebo adds to this total, and exceeding the limit requires a variance application. Height limits for accessory structures are typically 3.5-5 metres, which accommodates most standard sheds and gazebos but could be an issue for larger workshop-style buildings.

For construction in New Brunswick's climate, consider these practical requirements. Any structure with a foundation or floor must account for the 1.2-1.5 metre frost depth — options include a floating slab on compacted gravel pad (most common for sheds), concrete sono-tube footings extending below the frost line (preferred for gazebos and larger buildings), or pre-cast concrete deck blocks sitting on undisturbed soil. Roof design must handle the province's heavy snow loads (3-5 kPa depending on location), which means adequate rafter sizing and proper roof pitch. Consult your local building department before starting — a 10-minute phone call can save you from costly mistakes and potential teardown orders.

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