What subbase depth does a Vancouver paver driveway need?

A paver driveway in Metro Vancouver requires a minimum 10-12 inches (250-300mm) of compacted granular base — significantly deeper than a patio or walkway, and deeper than what many contractors in drier climates would specify.

Here's why that depth matters, and what goes into it.

Why Driveways Need More Base Than Patios

Driveways carry vehicle loads — typically 3,000-6,000 lbs per vehicle — that transmit downward pressure through the pavers and bedding sand into the base below. If the base isn't deep enough or isn't properly compacted, the load causes the base to compress unevenly, and pavers settle, rock, and shift within a season or two. The 10-12 inch minimum is the ICPI (Interlocking Concrete Pavement Institute) standard for residential vehicular applications, and it's the right call for Metro Vancouver specifically.

Metro Vancouver's clay-heavy soils — particularly common in Surrey, Langley, Delta, Richmond, and parts of Burnaby — make adequate base depth even more critical. Clay holds water, swells when saturated, and provides poor load-bearing capacity when wet. With over 1,200mm of annual rainfall in the region, your driveway subgrade is wet for a significant portion of the year. A shallow base on clay subgrade is a recipe for failure.

What the Base Stack Looks Like

The full base assembly for a Metro Vancouver driveway, from bottom to top:

Geotextile fabric goes down first, directly on the compacted native subgrade. This is non-negotiable on clay soils — it prevents clay from migrating upward into your gravel base over time, which would destroy the drainage capacity of the base and turn it into a saturated, unstable layer. Use a woven geotextile rated for separation applications (not the lightweight landscape fabric sold at garden centres).

Granular base (Crusher Run or 3/4" crushed gravel) fills the excavated depth — typically 10-12 inches total, compacted in lifts of no more than 2 inches at a time. Each lift gets a full pass with a plate compactor before the next lift goes in. This is where most DIY and budget installations fail: dumping all the gravel in at once and running a compactor over the top does not compact the lower layers. You need to build it up in stages to achieve the 95%+ compaction density required for vehicular loads.

1 inch of bedding sand (coarse concrete sand, not fine play sand) is screeded level on top of the compacted base. This is the setting bed for the pavers — it's not structural, and it should not be compacted before laying pavers.

80mm (3-1/8 inch) concrete pavers — this is the minimum thickness for driveways. Do not use 60mm pavers on a driveway. They are rated for pedestrian traffic only and will crack under vehicle loads.

Polymeric sand in the joints, properly activated. Standard sand washes out of joints in Metro Vancouver's rainy season within weeks. Polymeric sand hardens when activated with water and resists the erosion that comes with 1,200mm+ of annual rainfall.

Slope and Drainage

Surface slope is as important as base depth. The driveway surface must slope a minimum of 2% (1/4 inch per foot) away from your garage and house foundation. Water that pools on or beneath a driveway saturates the base and accelerates failure. If your lot grades toward the house, a channel drain (linear drain) across the driveway apron — connected to the municipal storm drain or a dry well — is essential.

What Excavation Depth That Means

For a 10-12 inch base plus 1 inch of bedding sand plus 80mm (3.1 inches) of paver, you're excavating roughly 17-19 inches below finished grade. That's a significant dig. Removing and disposing of that material, plus hauling in the gravel base, is a major cost component — typically $2,000-$5,000 of a driveway project budget. If you're also removing existing concrete or asphalt, add another $2,000-$5,000 for demolition and disposal.

A properly built Metro Vancouver paver driveway runs $10,000-$24,000 installed for a typical 500-800 sq ft residential driveway. That price reflects the depth of excavation, volume of base material, and skilled labour required to do it right.

Driveway installations are firmly in professional territory — the equipment required (excavator or mini-excavator, plate compactor, laser level for screeding) and the consequences of getting the base wrong make this one to leave to an experienced hardscape contractor. Vancouver Interlock can match you with a local installer for a free estimate if you're ready to move forward.