How long does a full interlock driveway installation take in Ottawa from excavation to completion?

A full interlock driveway installation in Ottawa typically takes 3 to 7 working days from excavation to completion, depending on the size of the driveway, soil conditions, weather, and crew size. Most average residential driveways (40-60 square metres) are completed in 4 to 5 days with a professional crew.

Day 1: Excavation and Initial Base Preparation
The crew excavates to the required depth — typically 600 to 750mm in Ottawa due to our deep frost line of 1.2 to 1.5 metres. On Ottawa's prevalent clay soils (common in Barrhaven, Orleans, Gloucester, and Riverside South), excavation often reveals challenging subgrade conditions that require additional time for proper preparation. Geotextile fabric is installed over clay subgrade to prevent soil migration into the granular base. The first lift of Granular B sub-base (typically 150mm) is placed and compacted.

Days 2-3: Base Layer Construction
The remaining Granular B sub-base is installed in 150mm lifts with proper compaction between each lift — this is critical in Ottawa where inadequate base depth leads to frost heaving and paver displacement within the first winter. The total Granular B depth should be 300mm minimum, more on unstable clay soils. The final Granular A base layer (150mm) is then placed, graded to proper slope for drainage, and compacted to specification. Proper base preparation cannot be rushed — this is where budget contractors cut corners and cause premature failure.

Day 4: Paver Installation
The bedding sand layer (25-40mm) is screeded to create a smooth, level surface. Pavers are laid according to the chosen pattern, starting from a straight edge (usually the garage or house foundation) and working outward. Edge restraints are installed to prevent paver migration under Ottawa's freeze-thaw cycling and snow plow loads. Cutting pavers to fit around curves, obstacles, and edges requires precision and adds time to the installation.

Day 5: Finishing and Compaction
Polymeric sand is swept into all joints, excess sand is removed from paver surfaces, and the entire surface is compacted with a plate compactor to seat the pavers into the bedding sand. The polymeric sand is then activated with a fine water mist to lock the joints. Final grading around the driveway edges ensures proper drainage away from the house foundation.

Ottawa-Specific Timing Considerations
Weather significantly impacts installation timing in Ottawa. Rain delays work because wet granular base cannot be properly compacted, and polymeric sand cannot be activated in wet conditions. The installation season runs from late April through October, with September and early October being ideal months — warm days for proper compaction but cool enough to prevent rapid moisture loss from polymeric sand during activation.

Factors That Extend Installation Time
Complex patterns, multiple paver colours, curved edges, and integration with existing landscaping add 1 to 2 days. Poor soil conditions requiring additional excavation or imported granular material can add 2 to 3 days. Large driveways (over 100 square metres) or those requiring retaining walls for grade changes may take 7 to 10 days. Heritage district restrictions in areas like the Glebe or New Edinburgh may require specific paver types or installation methods that slow progress.

Quality contractors will not rush the base preparation phase — a properly compacted base that extends below Ottawa's frost line is the foundation of a driveway that will last 25 to 30 years. Contractors who promise completion in 2 days are likely cutting corners on base depth, compaction, or curing time that will lead to settling, heaving, and joint failure within 2 to 3 Ottawa winters.

Need help finding an experienced interlock contractor? Ottawa Driveways can match you with local paving professionals who understand Ottawa's soil conditions and climate requirements.