How much does it cost to make an illegal basement apartment legal in New Brunswick?

The cost to legalize an illegal basement apartment in New Brunswick typically ranges from $15,000 to $50,000+, depending on what code violations need to be corrected and whether your municipality even allows secondary suites.

Start with zoning compliance first — this is critical because New Brunswick doesn't have province-wide secondary suite permissions like some other provinces. Each municipality and Regional Service Commission (RSC) sets their own rules. Fredericton generally permits secondary suites in residential zones, while Moncton and Dieppe allow them with specific conditions. Saint John's rules vary by neighbourhood, and rural areas under RSC jurisdiction have widely different requirements.

Contact your local building department immediately — either your municipality or the appropriate RSC if you're in an unincorporated area. You'll need to apply for a building permit to bring the space up to National Building Code 2020 standards (effective May 1, 2025 for new applications). The permit application will trigger an inspection that identifies all code violations.

Common expensive fixes include:

• Fire separation: Installing proper fire-rated walls/ceiling between units ($3,000-$8,000)


• Emergency egress: Cutting in proper bedroom windows meeting size requirements ($2,500-$6,000 per window)


• Separate entrance: Creating code-compliant exterior access ($5,000-$15,000)


• Electrical upgrades: Licensed electrician must install separate panel, proper outlets, GFCI protection ($3,000-$8,000). Requires NB Power wiring permit (1-800-615-0522) and TIS inspection


• Plumbing rough-in: If adding bathroom/kitchen, licensed plumber required with TIS permit ($4,000-$12,000)


• Ceiling height: If under 1.95m (6'5"), you may need to lower the floor or raise the ceiling ($8,000-$20,000+)


• Interconnected smoke/CO alarms: Throughout both units ($500-$1,200)

The permit fees alone run $1,500-$5,000 depending on the scope of work. All electrical work requires a licensed contractor (TIS licensing: 1-888-659-3222) and all plumbing modifications need licensed plumbers with proper permits.

If your area doesn't allow secondary suites, you'll need to apply for a zoning variance or development permit, which adds time and costs but isn't always successful. Some older neighbourhoods have restrictions that can't be overturned.

Your next step is calling your local building department to confirm zoning compliance and schedule a consultation. They'll outline exactly what needs upgrading before you spend money on contractors.

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