What is a dock-to-grade ratio in industrial real estate?

What is a dock-to-grade ratio in industrial real estate?

The dock-to-grade ratio describes the proportion of dock-level loading doors (raised loading bays with levelers that allow direct trailer-to-floor loading) relative to the total floor area of an industrial building. It is expressed as a ratio — for example, one dock door per 5,000 square feet, or one dock per 10,000 square feet — and is one of the most operationally significant building specifications for distribution, warehousing, and logistics tenants. Dock doors are the primary bottleneck in any distribution operation. Each dock position accommodates one 53-foot trailer at a time, and the number of simultaneous inbound and outbound truck movements a building can handle is directly limited by the number of available dock positions. A high-throughput distribution centre with a low dock ratio will reach truck capacity constraints well before it reaches storage capacity constraints — creating operational inefficiency regardless of how efficiently the interior of the building is organized. In the GTA industrial market, dock ratios vary significantly by building type, vintage, and intended use. Modern Class-A distribution centres with high-throughput requirements — e-commerce fulfillment, 3PL operations, food distribution — are typically delivered with one dock door per 4,000 to 6,000 square feet. Standard distribution buildings from the 2000s typically have one dock per 8,000 to 12,000 square feet. Older multi-tenant small-bay buildings may have only one or two dock doors serving the entire unit, or drive-in doors only with no dock-level loading. The distinction between dock-level doors and grade-level (drive-in) doors is critical. Dock-level doors are raised to trailer height (approximately 48 inches above grade) and allow forklifts and pallet jacks to roll directly from the building floor onto the truck trailer floor. Grade-level drive-in doors are at floor level and require ramps or pit levelers for efficient trailer loading — they are suitable for light manufacturing, small-bay tenants, and operations with infrequent truck movements, but are inefficient for high-frequency trailer loading. For tenants evaluating GTA industrial warehouse or distribution space, assessing the dock ratio against your actual inbound and outbound truck movement frequency is essential. A tenant with 20-30 trailer movements per day in a 100,000 SF building needs a materially different dock ratio than a tenant with 5 trailer movements per week. Michael Law advises GTA industrial tenants on building specification requirements including dock ratios. Contact Michael at mlaw@lennard.com or (905) 917-2045.