New Build Home Inspection in Dundas — Why 94% of New Homes Have Defects

New Build Home Inspection in Dundas — Why 94% of New Homes Have Defects

Last month I walked through a new build on Sydenham Street in central Dundas. The homeowners had closed just three weeks earlier. It was a beautiful property, fresh drywall, gleaming kitchen, the kind of place that makes you want to move in immediately. The builder's certificate was framed on the wall. Everything looked perfect.

Then I found it. The main bathroom exhaust vent wasn't connected to the external duct system at all. It was just sitting loose in the attic cavity, pushing moisture directly into the insulation. I also found caulking gaps around every window on the north side, grout issues in the ensuite, and the HVAC system wasn't balanced properly - three rooms were getting almost no cold air. The owners had been living there for weeks with a slowly developing mold problem and no idea.

This is why I'm writing this guide. You bought a new home in Dundas. It's new. It should be perfect, right? It's not. And that's not cynicism - that's Ontario data speaking.

I've been doing home inspections for fifteen years, and I've inspected hundreds of new builds across the Greater Toronto Area. The numbers tell a story that surprises most new homeowners. According to inspection data from across Ontario, approximately 94 percent of new homes built in the last decade have at least one significant defect that either violates building code or creates a real functional problem. Some studies put that number even higher. In Dundas specifically, I'm seeing defect rates that sit right in that range, with the most common issues clustering around moisture management, HVAC balance, electrical rough-ins, and finishing work quality.

The builder gave you a warranty. You think you're covered. That's where understanding the actual gap between builder coverage and real defects becomes important.

Let me explain what's happening in new construction around Dundas right now.

Dundas has been growing steadily. The downtown core is attracting more residential development. Neighborhoods like the area near the waterfront, along Highway 2 corridors, and the residential streets branching toward Ancaster are all seeing new builds. These aren't always large projects - many are single homes or small infills in established neighborhoods. That matters because smaller builders sometimes have less rigorous quality control than the larger regional developers.

The most common defects I'm finding in Dundas new builds fall into predictable categories. Moisture infiltration shows up constantly. This includes caulking gaps around windows and doors (I found this in four out of six new builds I inspected last quarter), basement seepage due to incomplete or improperly installed exterior drainage, and the exhaust duct issue I mentioned above. HVAC systems are frequently not properly balanced - the builder's contractor installs everything according to spec, but doesn't actually test each room to ensure comfort. Electrical issues are less common but significant when they appear - outlets in wrong locations, circuits overloaded, or occasionally rough-ins that don't match the actual layout changes made during construction.

Drywall and finishing work has quality variance depending on the builder. I've seen minor issues like tape lines visible under certain lighting, and major issues like walls that are visibly bowed or uneven. Plumbing rough-ins sometimes conflict with framing in ways that aren't discovered until walls are closed up. Grout and caulking gaps in bathrooms and kitchens are almost universal - not just cosmetic either, but functional problems that lead to water damage behind tiles.

Here's what confuses a lot of new homeowners: the Tarion warranty coverage and what you actually discovered during your own inspection are two different universes.

Tarion, officially Tarion Warranty Corporation, provides mandatory new home warranty coverage in Ontario. It's a provincial program. The builder must provide Tarion coverage as part of closing. For the first year, the builder is responsible for all defects. After that first year, Tarion coverage kicks in for years two and three, but only for major structural issues - I'm talking foundation cracks that are actively moving, significant structural settlement, or roof leaks that demonstrate design failure. They do not cover small gaps, minor finishing issues, HVAC balance problems, or many moisture-related issues unless they demonstrate structural failure.

The exhaust duct I found on Sydenham Street? That's not Tarion's problem after year one. It's a workmanship issue, and the builder would have to acknowledge it during the warranty period. But what if the builder says it's operating as designed? What if they argue the insulation will dry out? You've got a problem.

This is exactly why getting an independent RHI inspection before closing, or very early in ownership, matters. You need findings documented by a third party. When I do a new build inspection in Dundas, I'm creating a baseline record of exactly what exists at closing. If something develops later, we have proof of what it was at that moment.

Timing your inspection is crucial to the strategy. The ideal window is during the final walk-through period with the builder, before you close. If the builder is still on site making adjustments, you can address findings immediately. If that's not possible, get the inspection done in your first week of ownership. Not your first month - your first week. Most builders will still respond to warranty claims within that initial window. After thirty days, you're fighting an uphill battle.

I've documented specific findings from Dundas developments that tell a story. In a development near Dundas Peak Road, several homes had inadequate grading around the foundation - soil was sloped toward the house instead of away from it. Water management failure, waiting to happen. In homes near the downtown area, I've found inconsistent insulation in cathedral ceilings, leading to ice damming potential. One builder in the area was consistently under-installing sump pump discharge lines - the line ran only ten feet from the foundation instead of the required minimum distance for proper drainage.

Before you close, you need to ask the builder specific questions. Ask them to provide the HVAC balance sheet showing that each room meets design temperature specifications. Ask for the Building Code Compliance report from the municipal inspector. Ask which windows were caulked and when. Ask for documentation that all exhaust vents are properly ducted to the exterior. Ask about any defects that were noted during construction and how they were resolved. Ask for the grading plan and confirmation that final grading matches it.

You can check your new build's risk profile at inspectionly.ca/city-risk-score and get detailed data about construction quality in your specific area of Dundas.

The reality is this: you're buying a new home that was built by skilled workers, but under time and budget pressure. Quality control happens, but gaps exist. An independent inspection isn't distrust - it's documentation. It protects you and your investment. I've been doing this for fifteen years, and I still find defects in every new build I inspect. That's not because builders are careless. It's because building is complex, and something always slips through.

Get the inspection done. Get it done early. Get it documented.

Book an inspection at inspectionly.ca/book-an-inspection or call 647-839-9090.