New Brunswick: secondary suites and ADUs need two rule checks.

New Brunswick: local planning permission plus provincial building code.

Under the Community Planning Act framework, zoning bylaws regulate permitted uses, density, lot standards and other land-use controls. Current provincial sources reviewed for this guide do not establish a blanket province-wide secondary-suite or ADU unit-count entitlement comparable to B.C. or Ontario.

New Brunswick adopted the National Building Code of Canada 2020 as its provincial minimum standard effective May 1, 2025. A project therefore needs both the local/regional planning answer and the applicable building-permit/code answer.