After conducting hundreds of home inspections throughout Forest Hill, Ontario, I've noticed certain

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Aamir Yaqoob, RHI

RHI Certified · OAHI Member · InterNACHI · E&O Insured

April 7, 2026 · 4 min read

After conducting hundreds of home inspections throughout Forest Hill, Ontario, I've noticed certain issues appearing more frequently than others in this beautiful neighborhood. As a Registered Home Inspector, I want to share the top five findings that homeowners and potential buyers should be aware of when dealing with Forest Hill properties. Understanding these common issues can help you make informed decisions and budget appropriately for necessary repairs.

Aluminum wiring stands out as one of the most significant concerns I encounter in Forest Hill homes, particularly those built between 1965 and 1975. Many of the elegant older homes in this area were constructed during the peak period of aluminum wiring installation. The primary issue isn't the aluminum itself, but rather the connections and junction points where the wiring meets outlets, switches, and other electrical components. Over time, these connections can become loose due to the natural expansion and contraction of aluminum, creating potential fire hazards.

When I discover aluminum wiring during an inspection, I always recommend having a qualified electrician evaluate the entire system. Complete rewiring typically costs between $8,000 and $15,000 for an average Forest Hill home, depending on the size and complexity of the electrical system. However, less expensive remediation options like installing CO/ALR rated devices or pigtailing connections may cost between $2,000 and $5,000.

Poly-B plumbing represents another frequent finding in Forest Hill homes constructed between the late 1970s and mid-1990s. This gray plastic piping was popular during that era but has since been linked to premature failure, particularly at fitting connections. The material becomes brittle over time and can crack unexpectedly, leading to significant water damage. I often find evidence of previous leaks or repairs that indicate ongoing issues with poly-B systems.

Replacing poly-B plumbing is a substantial investment, typically ranging from $12,000 to $20,000 for a complete home re-plumb. The cost varies depending on the home's size, accessibility of existing plumbing, and whether walls need to be opened. Many homeowners choose to replace the system proactively rather than wait for failures, especially when renovating other areas of the home.

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Foundation issues, particularly minor cracks and settlement, appear regularly in my Forest Hill inspections. The area's clay soil conditions contribute to seasonal movement that can stress foundation walls. Most cracks I observe are minor and related to normal settling, but some require attention to prevent water infiltration or further deterioration. I pay special attention to horizontal cracks, stepped cracks in block foundations, and any signs of bowing or displacement.

Minor foundation crack repairs typically cost between $500 and $2,000, while more extensive foundation work can range from $5,000 to $15,000. Waterproofing solutions, often necessary in Forest Hill's climate, generally cost between $3,000 and $8,000 depending on the extent of work required.

Roof wear and aging consistently rank among my most common findings, particularly given that many Forest Hill homes feature complex rooflines with multiple slopes and architectural details. Asphalt shingles, the most common roofing material in the area, typically last 20 to 25 years but can show signs of wear earlier due to weather exposure and ice dam formation. I frequently observe missing or damaged shingles, worn flashing around chimneys and dormers, and compromised caulking around roof penetrations.

Roof replacement costs in Forest Hill typically range from $12,000 to $25,000, depending on the roof size, complexity, and material choices. Partial repairs might cost between $1,500 and $5,000, though these are often temporary solutions for aging roof systems.

HVAC system failures and inefficiencies round out my top five findings. Many Forest Hill homes have older forced-air systems that haven't received proper maintenance or have components nearing end-of-life. I commonly discover dirty ductwork, aging furnaces operating below optimal efficiency, and air conditioning units that struggle to cool these often large, multi-story homes adequately.

Just last month, I inspected a beautiful 1960s Forest Hill home where the family had been experiencing high energy bills and uneven temperatures. My inspection revealed a 30-year-old furnace with a cracked heat exchanger, ductwork that had never been cleaned, and inadequate insulation in the attic space. The combination of these issues was costing the family hundreds of dollars monthly in excessive energy costs.

HVAC replacement costs vary widely, from $4,000 to $8,000 for a new furnace and $3,000 to $6,000 for central air conditioning. Ductwork cleaning and sealing typically costs between $800 and $2,000, while improved insulation might add another $2,000 to $5,000 to your investment.

Understanding these common issues helps Forest Hill homeowners and buyers approach their properties with realistic expectations and proper planning. While these findings might seem daunting, remember that most can be addressed systematically over time. A thorough home inspection provides the roadmap for maintaining your Forest Hill home's value and ensuring your family's safety and comfort for years to come.

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