Top 5 Inspection Red Flags in Older Etobicoke Homes (2026)

By Jatin Dua · Broker of Record, RE/MAX Quantum Realty · Updated 30 October 2026 · 8 min read — Five issues I flag when buyers look at older Etobicoke houses, with what ESA, TSSA, the City of Toronto and Health Canada say about each.

How I chose these five

I picked the five issues that come up most often when a buyer looks at an older house in Etobicoke, and that each have a clear official rule or program behind them. A home inspector flags many things, but these are the ones that can change your insurance, your financing, your renovation budget or your health.

For each one I relied on the agency that actually sets the rules: the Electrical Safety Authority (ESA) for wiring, the City of Toronto for lead water pipes and basement flooding, the Technical Standards and Safety Authority (TSSA) for buried oil tanks, and Health Canada for asbestos. I left out anything I could not confirm on one of those pages.

This is not a substitute for a home inspection or a licensed trade. It is a list of what I want my buyers to ask about before the conditions on an offer expire.

1. Knob-and-tube (and aluminum) wiring

What it is

Knob-and-tube is an early wiring method. The ESA says it “was used in homes in the early 1900s to 1940s and is no longer used,” and that these older systems “do not have the same safety benefits as modern ones,” such as ground fault protection in bathrooms and outdoors.

The ESA does not say it must be ripped out. Its position is that knob-and-tube “is safe, provided it is properly maintained by a Licensed Electrical Contractor,” and that the current Ontario Electrical Safety Code is not retroactive.

Why it matters to buyers

The real pressure usually comes from insurance. The ESA notes that many insurers “will not provide or renew coverage on homes with this type of wiring,” and some require replacement before they will insure.

Homes built from the mid-1960s to the late 1970s may have a different issue: aluminum branch wiring. The ESA says aluminum wiring “is safe if proper connections and terminations are made,” but that some insurers want an ESA inspection and a Certificate of Acceptance before they will cover the house.

Practical notes

• Ask the seller whether any knob-and-tube remains, and whether past electrical work came with ESA paperwork.
• Have a Licensed Electrical Contractor assess the system. The ESA points out this is different from a general home inspection.
• Call your insurer before your conditions expire, not after.

Sources: ESA on knob-and-tube and ESA on aluminum wiring.

2. A lead water service pipe

What it is

The water the City treats does not contain lead, but older pipes can add it. The City of Toronto says lead service pipes “affect homes built before the mid-1950s,” and that lead can also come from solder used before 1990 and leaded-brass fixtures.

The service pipe has two owners. The City owns the section from the watermain to the property line, and the homeowner owns the section from the property line into the house.

Why it matters to buyers

The City lists pregnant people, infants and children under six as most at risk. It also recommends replacing both sides at the same time, because cutting the pipe to replace only one side can temporarily raise lead levels.

Under the City’s Priority Lead Water Service Replacement Program, a homeowner who commits to replacing the private side can ask the City to replace its side on a priority basis. The City aims to replace its portion within 12 weeks of approval, and the private side is the homeowner’s cost.

Practical notes

• A licensed plumber can confirm the pipe material. You can also ask 311 for a records check, which the City says can take up to 30 business days.
• The City offers free lead testing for residents and says “Testing is the only way to know if your water has lead.”
• Until it is replaced, the City suggests using cold water for drinking and cooking and an NSF-053 certified filter.

Sources: City of Toronto, lead in drinking water and Priority Lead Water Service Replacement Program.

3. An underground oil tank

What it is

Some older houses were heated with fuel oil stored in a buried tank, and the tank was not always removed when the house switched to gas. TSSA is direct about it: “Ontario regulations require you to remove an unused underground storage tank.”

Why it matters to buyers

The cost follows the owner. TSSA says owners are “responsible for the costs of maintaining, upgrading, and removing their underground tanks,” including cleaning up any contamination. When a tank is removed, the owner or operator must submit an Environmental Assessment Report.

Leaving a tank in the ground is not automatic. TSSA “may issue a variance” allowing it, but only after an application and an environmental assessment.

Practical notes

• Look for capped fill or vent pipes near the foundation, and ask the seller directly about past oil heat.
• Only a TSSA-registered petroleum contractor may remove a buried fuel oil tank. Ask for the registration number.
• If a tank is suspected, put a specific condition in the offer rather than relying on a general inspection clause.

I go through this in more detail in my guide to underground oil tanks in Ontario. Source: TSSA, FAQs: Storage Tanks.

4. Asbestos and vermiculite insulation

What it is

Health Canada says asbestos was mainly used before 1990 for insulation and fireproofing. In older homes it can turn up in vermiculite attic insulation, insulation around hot water pipes and tanks, floor and ceiling tiles, plaster, roofing products, siding and some heating systems.

Why it matters to buyers

The risk comes from disturbing it. Health Canada says there are no significant health risks if asbestos materials are left undisturbed, sealed behind walls or isolated in an attic, but drilling, sawing, sanding or scraping can release fibres linked to lung cancer, asbestosis and mesothelioma.

That makes it mostly a renovation budget issue. If you plan to open walls, redo an attic or remove old flooring, testing and professional removal need to be part of the plan.

Practical notes

• Health Canada advises hiring a professional to test for asbestos before renovating.
• For vermiculite, it advises not storing things in the attic, keeping children out, and not disturbing or removing it yourself.
• If asbestos is found, hire a qualified removal specialist.

Source: Health Canada, Asbestos and your health.

5. Basement water and flooding risk

What it is

Water in an older basement can come from the ground, from the roof, or from the sewer backing up. A home inspector will look for staining, efflorescence and past repairs, but the City’s programs focus on the sewer and drainage side.

Why it matters to buyers

Toronto’s Basement Flooding Protection Subsidy Program offers up to $6,650 per property for work completed on or after November 12, 2025. The City covers up to 80% of invoiced costs, with maximums of $500 for a home plumbing assessment, $1,600 per backwater valve (up to two), $2,250 for a sump pump, $300 for a battery backup and $400 for weeping tile severance and capping.

The program applies to single-family homes up to fourplexes. Downspouts must be disconnected from the sewer, which the City says is mandatory for all Toronto property owners unless an exemption is granted.

Practical notes

• Ask whether the house already has a backwater valve, and ask for the permit if it does. A backwater valve needs a building permit and inspection to qualify.
• Contractors must hold a valid City of Toronto business licence at the time of the work.
• Applications are due within two years of installation, and the City says processing can take up to 10 weeks.

My basement flooding subsidy guide walks through the application. Sources: City of Toronto subsidy program and mandatory downspout disconnection.

The five at a glance

What this means if you’re buying or selling in Etobicoke

If you are buying an older house, the age of the home tells you which questions to ask. A house built before the mid-1950s is in the City’s range for a lead service pipe, and a house from the first half of the 1900s is in the ESA’s range for knob-and-tube. Aluminum wiring belongs to the mid-1960s to late 1970s.

None of these has to kill a deal, but each one has a cost and a timeline. I would rather a buyer price in a wiring update or a pipe replacement than discover it when the insurer calls. Plumbing questions do not stop at lead, either; my Kitec plumbing guide covers a newer problem pipe.

If you are selling, gather the paperwork before you list: ESA certificates, the backwater valve permit, any oil tank removal records and plumber invoices. Documents answer a buyer’s question in one page, and a clear answer usually keeps a conditional offer moving.

Frequently asked questions

Sources

• Knob and Tube Wiring — Electrical Safety Authority
• Aluminum Wiring — Electrical Safety Authority
• Lead in Drinking Water — City of Toronto
• Priority Lead Water Service Replacement Program — City of Toronto
• FAQs: Storage Tanks — TSSA
• Asbestos and your health — Health Canada
• Basement Flooding Protection Subsidy Program — City of Toronto
• Mandatory Downspout Disconnection — City of Toronto

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