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

Converting a basement to a legal secondary suite in New Brunswick typically costs $25,000 to $75,000, depending on the current condition and what upgrades are needed to meet building code requirements.

The biggest expense is usually creating a separate entrance, which can cost $8,000 to $20,000 including excavation, concrete work, stairs, and weatherproofing. You'll also need proper egress windows in any bedrooms ($2,000 to $4,000 per window including cutting through foundation walls), and upgrading electrical and plumbing systems to serve two separate units.

Fire separation is mandatory under the National Building Code — you'll need minimum 45-minute fire-rated assemblies between units, which typically means upgrading ceiling/floor construction with fire-rated drywall and proper sealing. This work often runs $5,000 to $12,000. All smoke and carbon monoxide alarms must be interconnected throughout both units.

Zoning compliance comes first — before spending any money, contact your local building authority to confirm secondary suites are permitted in your area. In incorporated areas like Moncton, Fredericton, or Saint John, check with the municipal planning department. For rural properties, contact your Regional Service Commission (RSC). Rules vary significantly across New Brunswick, and some areas don't permit basement apartments at all.

Permit and inspection costs include building permits ($1,500 to $5,000 depending on scope), electrical wiring permits through NB Power (1-800-615-0522), plumbing permits through Technical Inspection Services (1-888-659-3222), and various inspection fees. Licensed contractors are required for all electrical, plumbing, and gas work — homeowners cannot do this work themselves unless they hold valid NB trade licences.

Common additional expenses include upgrading heating systems (separate systems or fire-rated ductwork required), improving basement waterproofing and drainage, adding proper insulation to meet energy code requirements, and installing separate utility meters if required by your municipality.

Radon testing is crucial before finishing any New Brunswick basement — approximately 1 in 4 homes exceed Health Canada guidelines. If mitigation is needed, add $2,500 to $5,000 for a sub-slab depressurization system.

Start by getting a pre-application consultation with your local building department to understand specific requirements for your property and area. This upfront investment in professional guidance can save thousands in redesign costs later.