What fire-separation distance do I need between a deck and my detached garage in Burnaby?

Fire separation requirements between decks and detached garages in Burnaby follow the BC Building Code, which typically requires a minimum 1.2 metres (approximately 4 feet) between combustible construction and property lines or other buildings, though specific distances depend on your deck's construction materials and the garage's fire rating.

The BC Building Code establishes fire separation distances based on the unprotected opening area of buildings and their proximity to property lines or other structures. For most residential detached garages, the standard separation is 1.2 metres from combustible construction like wood decks. However, this can be reduced if your garage has a fire-rated wall facing the deck (typically 45-minute fire rating for the wall closest to the deck), or if your deck uses non-combustible materials like aluminum or steel framing.

Burnaby's specific requirements may be more restrictive than the provincial code, particularly in areas with smaller lots or higher density zoning. The City of Burnaby building department at 604-294-7300 can provide definitive guidance for your specific property and zoning. Fire separation requirements also depend on whether your garage has windows, doors, or vents facing the deck — these are considered "unprotected openings" that may require greater separation distances.

Practical considerations for Metro Vancouver properties include the fact that many older Burnaby neighborhoods have smaller lots where achieving full fire separation can be challenging. In these cases, you may need to use fire-rated construction materials, install fire-rated barriers, or modify your deck design to maintain safe separation. Cedar and pressure-treated lumber decks are considered combustible construction, while aluminum and steel-framed decks with non-combustible decking materials may have reduced separation requirements.

Before finalizing your deck plans, contact Burnaby's building department to confirm the exact separation distance required for your property. They'll need to know your lot size, zoning, garage construction details, and proposed deck materials. This consultation is essential because fire separation violations can force costly deck modifications or removal, and they create liability issues if a fire occurs.

When planning your deck layout, consider that fire separation is measured from the closest point of combustible construction — including deck railings, pergola posts, and any roof overhangs — to the garage wall. If space is tight, designing your deck with non-combustible railings and keeping combustible elements like cedar pergolas further from the garage can help you meet code requirements while maximizing your outdoor space.

Need help finding a deck contractor familiar with Burnaby's fire separation requirements? Vancouver Deck Contractors can match you with experienced professionals who understand local building codes and can design your deck to meet all safety requirements.