What is the maximum garage height allowed in residential zones in Saint John NB?

The maximum height for a detached accessory building such as a garage in residential zones in Saint John is typically limited to 5 metres (approximately 16 feet) at the peak, though this can vary depending on the specific zoning designation of your property. Saint John's municipal zoning by-law sets height limits for accessory structures that are generally lower than the height permitted for the principal dwelling, and your garage must comply with the limit that applies to your particular zone.

Saint John divides its residential areas into several zoning classifications — from low-density single-family zones to higher-density residential zones — and each classification has its own set of rules for accessory buildings. In most standard single-family residential zones, a detached garage is limited to one storey and must not exceed the height cap set out in the by-law. If you are planning a garage with a bonus room, loft, or second-storey storage area above, you need to pay close attention to the height measurement method. Saint John typically measures building height from the average finished grade at the building perimeter to the highest point of the roof. A steeper roof pitch will push you closer to the limit, while a lower-slope roof gives you more usable wall height before you hit the cap.

For attached garages, the height restriction is generally governed by the rules for the principal dwelling rather than the accessory building rules, since the garage becomes part of the main structure. This means an attached garage can often be taller than a detached one, especially if the roofline integrates with the house. However, the attached garage must still comply with all setback, lot coverage, and fire separation requirements.

NB Building Code and Municipal Zoning Interaction

It is important to understand that zoning by-laws and the NB Building Code work together but address different things. The zoning by-law controls where you can build, how tall the structure can be, how far it must sit from property lines, and how much of your lot it can cover. The NB Building Code controls how the structure must be built — foundation depth, structural capacity, fire separation, electrical, and so on. Your garage must satisfy both sets of requirements. In Saint John, you apply for a building permit through the city's Building Inspection division, and they review your plans against both the zoning by-law and the building code.

If your planned garage exceeds the permitted height for your zone, you have the option of applying for a variance through Saint John's Committee of Adjustment. A variance is a formal request to deviate from a specific zoning requirement, and it requires demonstrating that strict compliance would cause undue hardship and that the proposed deviation will not negatively impact neighbouring properties. Variance applications involve a public notification process and a hearing, and approval is not guaranteed.

Before you finalize your garage design, take these practical steps. First, confirm your property's zoning designation by contacting Saint John's planning department or checking the city's online zoning map. Second, request a copy of the specific height and setback rules for accessory buildings in your zone. Third, have your contractor or designer prepare drawings that clearly show the height measurement from finished grade to peak. Finally, submit your building permit application early in the planning process — the permit review will catch any height or setback issues before construction begins, which is far less expensive than discovering a problem after the foundation is poured.

Garage height restrictions exist for good reasons — they protect neighbours' sight lines, sunlight access, and property values. If you need a taller garage for a vehicle lift, RV storage, or a loft workspace, a professional garage contractor familiar with Saint John's zoning can help you design a structure that maximizes interior height while staying within the permitted envelope. Need help finding a professional garage builder in Saint John? New Brunswick Garages can match you with local contractors for free through the New Brunswick Construction Network.