Montreal's North Shore has experienced one of Quebec's most dramatic residential building booms since the early 2000s. From Terrebonne and Mascouche to Blainville, Boisbriand, Repentigny and Rosemère, thousands of new homes have been built on former farmland at a pace that sometimes prioritized speed over quality. Entire subdivisions have risen in a matter of months, with builders under pressure to deliver keys on schedule while managing labour shortages, fluctuating material costs and stretched supply chains. The result is a region where new construction is everywhere — and where construction defects are far more common than most buyers expect.
The assumption that a brand-new home is free of problems is one of the most expensive mistakes a buyer can make. Even homes built to current building code standards can harbour defects in grading, insulation, ventilation, plumbing and structural components that only become apparent months or years after delivery. The GCR (Garantie de construction résidentielle) warranty provides a framework for holding builders accountable, but that protection is only meaningful if defects are identified, documented and formally reported before the warranty deadlines expire. Understanding what can go wrong — and when to act — is the key to protecting your investment on the North Shore.
Why the North Shore sees more new construction defects than average
Several factors specific to the North Shore's development history and geography create conditions where construction defects are more likely to occur and harder to detect without professional inspection.
Explosive growth on converted farmland
Much of the North Shore's residential expansion has occurred on land that was agricultural just a decade or two earlier. Former farm fields in Terrebonne, Mascouche and Blainville have been transformed into dense suburban subdivisions at an extraordinary pace. Agricultural land presents specific challenges for residential construction: decades of tilling can create inconsistent compaction in the upper soil layers, existing field drainage patterns may not align with new subdivision grading plans, and the absence of mature tree cover means there is nothing to absorb surface runoff during heavy rains. When hundreds of homes are built simultaneously on these sites, the combined disruption to natural drainage can create problems that only emerge after the first few seasons of occupancy.
High-pace construction and builder pressure
The demand for new housing on the North Shore has been relentless, and builders operate under intense pressure to complete projects on schedule. When construction timelines are compressed, quality control suffers. Concrete may not cure fully before framing begins. Waterproofing membranes may be applied in suboptimal weather conditions. Insulation installation may be rushed, leaving gaps and compression points that compromise thermal performance. The pressure to deliver keys on promised dates creates an environment where shortcuts — sometimes subtle, sometimes significant — become part of the process. These shortcuts are rarely visible to the buyer on delivery day, but they manifest as problems in the months and years that follow.
Variable soil conditions
The North Shore is not geologically uniform. The lowland areas along the river in Repentigny and southern Terrebonne sit on marine clay deposits from the ancient Champlain Sea — the same dense, poorly draining clay that causes foundation problems across much of Greater Montreal. Moving north toward Blainville, Rosemère and the higher terrain of Mascouche, the soil transitions to sandy and gravelly glacial deposits that behave very differently under foundations. Clay soils can shift and settle unevenly as they absorb and release moisture through seasonal cycles, while sandy soils may present challenges with erosion and drainage concentration. A foundation system that performs well in one part of the North Shore may be inadequate in another, and not all builders adjust their approach to match the specific soil conditions of each lot.
Inexperienced subcontractors
Rapid construction growth attracts labour from across the industry, and the quality of workmanship varies dramatically from one subcontractor to another. Major builders on the North Shore typically manage dozens of projects simultaneously, relying on networks of subcontractors for everything from foundation work to insulation, plumbing, electrical and finishing. When demand outstrips the supply of experienced tradespeople, less experienced crews are brought in to fill the gap. The result is inconsistency: one home in a subdivision may be impeccably built, while the house next door has significant defects in framing, insulation or mechanical systems. Without an independent inspection, the buyer has no way to know which category their home falls into.
The most common defects we find in North Shore new builds
Over years of inspecting new construction across the North Shore, certain categories of defects appear with striking regularity. These are the issues we encounter most frequently during pre-delivery, warranty and post-construction inspections in Terrebonne, Blainville, Mascouche, Repentigny, Boisbriand and surrounding municipalities.
Poor lot grading and drainage
Lot grading is one of the most common and consequential defects in North Shore new builds. The ground around the foundation should slope away from the house on all sides, directing surface water toward the street or designated drainage areas. In practice, we frequently find grading that slopes toward the foundation rather than away from it, creating conditions where rainwater and snowmelt pool against basement walls. Inadequate window wells that collect water rather than divert it, undersized sump pumps that cannot keep up with the water volume during spring thaw, and missing or poorly installed weeping tile are all common findings. On converted farmland, the problem is compounded by the fact that the original grading may settle unevenly as the disturbed soil compacts over the first few years, gradually reversing slopes that were correct at the time of construction.
Insulation and air barrier defects
Insulation defects are pervasive in new North Shore construction and are among the most difficult to detect without specialized equipment. Common findings include gaps in insulation coverage — particularly at rim joists, around electrical boxes, and at transitions between wall and ceiling assemblies. Poorly sealed or torn vapour barriers allow warm interior air to reach cold surfaces inside the wall cavity, creating condensation that can lead to mold growth and structural deterioration over time. Thermal bridges at window frames, structural connections and cantilevered sections allow heat to bypass the insulation entirely, creating cold spots that drive up heating costs and reduce occupant comfort. These defects are virtually invisible once the drywall is installed, which is why pre-drywall inspections are so valuable.
Insufficient attic ventilation
Attic ventilation is a critical system that is frequently inadequate in new North Shore homes. Proper ventilation requires balanced intake at the soffits and exhaust at or near the ridge, creating continuous airflow that removes moisture from the attic space and keeps the roof deck temperature consistent. When ventilation is insufficient — whether due to blocked soffits, missing baffles, inadequate exhaust area or bathroom fans that vent into the attic rather than to the exterior — the consequences are significant. In winter, warm moist air trapped in the attic causes ice dams along the eaves that can damage shingles and allow water to back up under the roof covering and into the building envelope. In summer, excessive heat buildup accelerates shingle deterioration and drives cooling costs higher. Over time, chronic moisture accumulation in an under-ventilated attic can lead to mold growth on roof sheathing and framing members.
Plumbing and HVAC rough-in issues
Mechanical systems in new construction are often installed by subcontractors working under tight timelines, and the quality of rough-in work varies considerably. Common plumbing defects include incorrect slopes on drain lines that impede proper waste flow, missing P-traps that allow sewer gases to enter the living space, and supply connections that were not pressure-tested before the walls were closed. On the HVAC side, we regularly find ductwork that is poorly supported, improperly sealed at joints, or configured in ways that create excessive restriction and reduce airflow to certain rooms. Heat recovery ventilators (HRVs), which are standard in new Quebec construction, are frequently found to be improperly balanced — meaning the intake and exhaust airflows are not matched, which compromises their effectiveness at managing indoor air quality and humidity. These issues are functional rather than aesthetic, and many homeowners live with them for years without realizing their systems are underperforming.
Finishing defects before delivery
Finishing defects are the most visible category and the ones most buyers focus on during their own walkthrough. Cracked or poorly taped drywall joints, uneven or squeaky flooring, poorly installed trim and moulding, misaligned cabinet doors, paint deficiencies and incomplete caulking are all common findings. While these defects are typically cosmetic rather than structural, they represent a standard of workmanship that the buyer is paying a premium for in new construction. Individually, each finishing defect may seem minor. Collectively, they can signal a broader pattern of rushed or careless work that may extend to less visible — and more consequential — building systems. Documenting all finishing defects before taking possession is essential, because once you accept delivery, the burden shifts to you to prove the defects existed at the time of handover.
Foundation cracks appearing within the first year
Cracks in poured concrete foundations are common within the first year of a new home's life, but not all cracks are created equal. Shrinkage cracks — typically thin, vertical lines that appear as the concrete cures and dries — are a normal part of the curing process and are generally not structurally significant, though they should be sealed to prevent water infiltration. Settlement cracks, on the other hand, can indicate that the foundation is moving in response to soil conditions. On the North Shore, where clay soils in Repentigny and southern Terrebonne undergo significant seasonal volume changes, settlement cracks can be early indicators of an ongoing foundation issue. Horizontal cracks, stair-step cracks in block foundations, and cracks that are wider at one end than the other all warrant professional evaluation. The key is documentation: every crack should be measured, photographed and recorded so that any progression can be tracked over the warranty period.
Understanding your GCR warranty
The Garantie de construction résidentielle (GCR) is Quebec's mandatory warranty program for new residential construction. It is designed to protect buyers against defects in materials, workmanship and structural integrity for defined periods following delivery. Understanding the warranty structure — and critically, the deadlines — is essential for every new home buyer on the North Shore.
The three warranty tiers
- Year 1 — Finishing and materials: Covers defects in finishing work, materials and equipment. This includes everything from cracked drywall and uneven flooring to faulty fixtures and defective materials. Defects must be reported to the builder in writing before the first anniversary of delivery.
- Years 1 to 3 — Hidden defects and distribution systems: Covers defects that were not apparent at the time of delivery and defects in distribution systems including plumbing, electrical and HVAC. Hidden defects are those that a reasonably diligent buyer would not have discovered during the delivery inspection. This tier also covers problems with water infiltration that were not visible at delivery.
- Years 1 to 5 — Major structural defects: Covers defects in the foundation, load-bearing walls, roof structure and other elements that compromise the structural integrity or stability of the building. This is the most serious category and covers the most expensive types of repair.
The critical point that many homeowners miss is that defects must be formally documented and reported to the builder before each deadline expires. If a structural defect is discovered at year four but not reported until after the five-year mark, the GCR warranty will not cover it. Many North Shore homeowners miss the three-year and five-year deadlines entirely because they are unaware these extended warranty periods exist or because they assumed the builder would proactively address issues. The builder has no obligation to seek out defects — that responsibility falls on the homeowner.
Our new construction inspection service covers up to six phases — from foundation before backfill through to the five-year warranty deadline — ensuring that every defect is documented and reported within the applicable warranty period.
What a new construction inspection covers
A comprehensive new construction inspection program follows the building process from the earliest stages through the full warranty period. Each phase targets defects that are only accessible or detectable at that specific point in the construction or ownership timeline.
Pre-pour and foundation inspection
Conducted before the foundation is backfilled, this inspection evaluates the formwork, reinforcement placement, concrete quality, waterproofing membrane installation and drainage system. Defects found at this stage are relatively inexpensive to correct. Once the foundation is backfilled, they become exponentially more costly to address. On the North Shore, where soil conditions vary significantly from one lot to the next, confirming that the foundation design matches the actual soil conditions is particularly important.
Pre-drywall and framing inspection
This inspection takes place after framing, insulation, electrical and plumbing rough-in are complete but before drywall is installed. It is arguably the most valuable single inspection in the new construction process, because it provides the only opportunity to evaluate the quality of work that will be permanently concealed behind finished surfaces. Framing connections, insulation coverage, vapour barrier continuity, fire-stopping, plumbing slopes, electrical installations and HVAC ductwork are all evaluated while they are still visible and accessible.
Pre-delivery inspection
The pre-delivery walkthrough is the most familiar phase for buyers. Every visible surface, fixture, appliance and system is evaluated and documented. This is the buyer's opportunity to create a comprehensive punch list of defects that the builder is obligated to correct before or shortly after possession. Having a professional inspector conduct this walkthrough rather than relying on the builder's own quality-control process ensures that nothing is overlooked and that all findings are documented in a format that can be submitted to the builder and, if necessary, to the GCR.
One-year warranty inspection
Conducted shortly before the first anniversary of delivery, this inspection captures defects that have appeared during the first year of occupancy — a period during which the building undergoes its first full cycle of seasonal temperature and humidity changes. Drywall cracks that appeared during the first heating season, foundation cracks from initial settlement, grading issues that became apparent during spring thaw, and plumbing or HVAC performance issues that emerged during the first winter are all documented and reported before the one-year finishing warranty expires.
Three-year warranty inspection
The three-year inspection is the most overlooked and potentially the most consequential. By the third year, hidden defects in plumbing, electrical and HVAC systems have had time to manifest. Water infiltration issues that were not visible at delivery or the one-year mark may now be apparent. Insulation defects that cause ice dams or excessive energy consumption have established a pattern. This inspection ensures that all hidden defects and distribution system problems are documented before the three-year deadline, preserving the homeowner's right to have them corrected under warranty.
Five-year structural inspection
The final warranty inspection focuses on the foundation, load-bearing structure and building envelope. Foundation cracks are measured and compared to any previous documentation to determine whether they are progressing. Signs of structural movement, differential settlement and water infiltration through the foundation are evaluated. On the North Shore, where clay soils in certain areas can cause ongoing foundation movement, this inspection is essential for identifying structural issues before the five-year warranty expires. A complete new construction inspection program that covers all six phases provides the strongest possible protection for your investment.
When to act
Timing is everything when it comes to new construction defects. The GCR warranty deadlines are firm, and once they pass, the financial responsibility for repairs shifts entirely to the homeowner. These are the critical moments when inspection delivers the most value.
- Before taking possession (pre-delivery): This is your strongest negotiating position. Document every defect before you accept the keys. Once you sign the delivery acceptance, the burden of proof shifts to you.
- During the first winter: The first heating season reveals insulation defects, ventilation inadequacies and air barrier failures that are impossible to detect during warmer months. If your home was delivered in spring or summer, plan an inspection during the first cold months.
- Before the one-year deadline: All finishing and material defects must be reported before the first anniversary. Settlement cracks, grading failures and equipment deficiencies that appeared during the first year are all covered under this deadline.
- Before the three-year deadline: This is the most frequently missed deadline and covers the most expensive category of non-structural defects. Hidden defects, plumbing and electrical problems, HVAC deficiencies and water infiltration issues must all be reported before year three.
- Before the five-year deadline: Structural defects — foundation problems, load-bearing wall issues, roof structure failures — are covered under the longest warranty tier. If you have not had a professional inspection before this deadline, you are gambling that no structural issues exist.
If you are purchasing a recently built resale home on the North Shore — one that is still within its GCR warranty period — a pre-purchase inspection can identify existing defects and help you determine how much warranty coverage remains. This information is invaluable for negotiating the purchase price and planning any necessary follow-up inspections before the remaining warranty deadlines expire.