When do I need a building permit for renovations in New Brunswick?

A building permit is required in New Brunswick for any renovation that involves structural modifications, building additions, new electrical circuits, new plumbing rough-in, gas appliance installation, egress window installation, or changes to a building's occupancy or use. Cosmetic renovations — painting, flooring, replacing existing fixtures on existing plumbing, cabinet replacement — generally do not require a permit.

Understanding the permit threshold matters because the consequences of skipping a required permit are serious: insurance claims can be denied, problems surface during a future home sale, and municipality or RSC inspectors can require demolition and reconstruction of unpermitted work. The permit fee itself is modest — typically $50–$500 depending on project scope and municipality — which makes skipping it a poor gamble.

Here is a practical breakdown of what triggers a permit in NB. Structural work always requires a permit: removing or altering any load-bearing wall, installing a new beam or header, cutting new window or door openings in load-bearing walls, underpinning or modifying a foundation, building an addition of any size, and adding a deck attached to the house (an unattached ground-level deck under a certain size may be exempt depending on your municipality — confirm locally). Electrical work beyond simple fixture swaps on existing circuits requires a permit filed with TSANB — this includes adding new circuits, upgrading the electrical panel, installing pot lights in a new run, or adding outlets in a new location. Plumbing that involves moving drain lines, adding new plumbing fixtures in new locations, installing a water heater, or roughing in a new bathroom requires a TSANB plumbing permit. Gas appliance installation, line relocation, or new gas rough-in requires a TSANB gas permit and must be done by a licensed gas fitter.

Where you apply for a building permit depends on where your property is located. In NB's incorporated municipalities — Moncton, Saint John, Fredericton, Bathurst, Miramichi, Dieppe, Riverview, Oromocto, Edmundston, Campbellton, and others — you apply to the municipal building inspection department. In unincorporated rural areas, permit applications go through the local Rural Service Commission (RSC). TSANB permits for electrical, plumbing, and gas work are always filed directly with TSANB regardless of location.

Some specific situations that NB homeowners are often uncertain about: re-shingling a roof without structural changes does not require a permit in most NB municipalities. Finishing a basement that involves adding a bathroom requires both a building permit (for the structural framing and egress window if applicable) and TSANB permits for electrical and plumbing. Installing a new furnace or heat pump requires a TSANB mechanical permit. Building an accessory structure — a shed or garage — requires a permit once it exceeds a threshold size (typically 10 sq metres in most NB municipalities, but confirm locally). Replacing existing windows with the same size windows in the same openings generally does not require a permit; cutting new openings does.

The safest approach when uncertain is to call your municipal building department or the rural service commission for your area before starting work. The conversation takes 10 minutes and eliminates all ambiguity. NB inspectors are generally practical and helpful — they want projects done correctly, not tripped up by technicalities. Your licensed contractor should also be guiding you on permit requirements for your specific project; a contractor who discourages permits for work that clearly requires them is a contractor worth reconsidering.

Budget permit fees into your project from the start — $50–$500 is the typical range in NB depending on scope and municipality. For any renovation involving structural, electrical, plumbing, or gas work, always confirm permit responsibility in your written contract with your contractor.

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Looking for experienced contractors? The New Brunswick Construction Network connects homeowners with qualified professionals:

• Gionetterenovations
• Thirty Four Renovations