How do I plan an Ottawa paver driveway for two side-by-side cars?

A two-car side-by-side interlock driveway in Ottawa requires a minimum width of 5.5 to 6 metres, a properly engineered base of at least 450mm total depth, and careful attention to City of Ottawa zoning rules before you break ground.

Planning this type of driveway is more involved than a single-lane job — the wider surface area amplifies every drainage, base, and compaction decision you make, and Ottawa's clay soils and 50+ annual freeze-thaw cycles will expose any shortcuts within the first two or three winters.

Start With the City of Ottawa Zoning Rules

Before you measure anything, check your zoning. Ottawa's residential zoning bylaw limits driveway width to the lesser of 50 percent of your front yard width or 8 metres at the property line. For most standard Ottawa lots (15 to 18 metres of frontage), a 5.5 to 6 metre driveway is achievable, but lots in older urban neighbourhoods like Westboro, Glebe, or Alta Vista with narrower frontages may not accommodate a full two-car width without a variance. If your driveway opening onto the municipal road requires a new or widened curb cut, you will need a permit from the City of Ottawa — call 3-1-1 or apply through the city's online portal before any work begins.

Properties in heritage conservation districts (Rockcliffe Park, New Edinburgh, Centretown, Sandy Hill) face additional restrictions on driveway materials and widths. Confirm with the City's heritage planning department before committing to a design.

Dimensions That Actually Work

For two cars parked side by side with comfortable door-swing clearance, plan for 5.5 metres minimum width, with 6 metres being the comfortable standard. If you want to walk between the cars and the garage or house wall without squeezing, 6 metres is the right target. Length should extend from the garage door to at least 5.5 metres beyond it so a parked car clears the sidewalk and does not overhang the municipal boulevard. A typical Ottawa two-car driveway runs 55 to 75 square metres in total area.

The Base Is Everything in Ottawa

This is where most budget driveway jobs fail. Ottawa's frost line sits at 1.2 to 1.5 metres, and the clay soils common in Barrhaven, Orleans, Gloucester, and Riverside South expand and contract dramatically with moisture and temperature changes. Your interlock base must be engineered to handle this.

The correct base specification for a residential interlock driveway in Ottawa is: 300mm compacted Granular B sub-base, followed by 150mm compacted Granular A base, followed by 30 to 40mm of compacted bedding sand, with the interlock pavers on top. On clay subgrade, a layer of geotextile fabric between the native soil and the Granular B is strongly recommended to prevent clay migration into your base over time. Total depth from finished paver surface to subgrade is typically 500 to 550mm. Any contractor proposing less than 450mm total base depth in Ottawa's climate is cutting corners that will cost you in heaving and settling within three to five years.

Drainage and Grading

A 6-metre-wide driveway collects a significant volume of water during Ottawa's spring melt and summer storms. The surface must slope a minimum of 2 percent toward the street — that is 20mm of drop for every metre of width. On a 6-metre-wide driveway, that means the centre is roughly 60mm higher than the edges, or the entire surface pitches consistently toward the road. Flat interlock driveways pool water, which freezes into ice sheets in Ottawa winters, accelerates joint sand washout, and promotes frost heaving.

If your lot has limited slope or the driveway runs alongside the house, consider a centre-crown profile (highest point at the centreline, sloping to both sides) or a linear channel drain across the bottom of the driveway to capture runoff before it reaches the garage. A catch basin connected to your weeping tile or a dry well is worth the additional $500 to $1,500 investment on a driveway this size.

Paver Selection for Ottawa's Climate

Use 80mm thick concrete interlocking pavers for a two-car driveway — the standard 60mm pavers are adequate for foot traffic and light use, but the additional thickness handles vehicle loads and snowplow pressure significantly better. Choose a paver with a chamfered edge (bevelled top edge), which reduces chipping from snowplow contact and makes relevelling easier if individual pavers need to be lifted in future years.

Avoid natural stone pavers (limestone, sandstone) on a driveway surface in Ottawa — they absorb road salt and scale badly within five to ten years. Manufactured concrete pavers with a sealed surface hold up far better.

Polymeric sand is non-negotiable for Ottawa interlock joints. Standard jointing sand washes out within one or two seasons. Polymeric sand hardens when activated with water, resisting weed growth, ant intrusion, and freeze-thaw displacement. Budget to reapply it every three to five years as part of routine maintenance.

What to Budget

A two-car side-by-side interlock driveway in Ottawa (55 to 75 square metres) typically runs $10,000 to $18,000 installed, depending on paver selection, base depth requirements, drainage work, and site accessibility. Standard concrete pavers with a straightforward running bond pattern sit at the lower end; premium pavers with a herringbone or fan pattern, border courses, and a channel drain push toward the upper end. Get at least three quotes and ask each contractor to specify the base depth and compaction method in writing — that detail separates quality work from budget work more than any other factor.

Hiring the Right Contractor

Always request a WSIB clearance certificate and proof of liability insurance before signing anything. Ask to see photos of completed interlock driveways from the past two seasons, and ask specifically what base depth and compaction equipment they use. A contractor using a hand tamper instead of a plate compactor or vibratory roller is not the right choice for a project this size.

Ottawa Driveways can match you with local interlock paving professionals through the Ottawa Construction Network — get matched for a free estimate at justynrookcontracting.com/directory?trade=paving.