5 Common Mistakes When Buying Home Insurance (and How to Avoid Them)

Buying home insurance should feel like protection. Instead, for thousands of Canadian homeowners, it becomes an expensive lesson learned only after something goes wrong.

The problem isn't that people skip insurance altogether — most homeowners carry a policy because their mortgage lender requires it. The problem is how they buy it. They sign up for the first quote they receive, skim past the fine print, and assume they're fully covered. Then a pipe bursts, a tree falls on the roof, or a basement floods — and they discover their policy doesn't cover what they thought it did.

According to the Insurance Bureau of Canada, insurance coverage gaps are one of the leading reasons homeowners face unexpected out-of-pocket expenses after a loss. Many of these gaps are entirely preventable.

In this guide, we'll walk through the 5 most common home insurance mistakes Canadian homeowners make, explain why each one can be so costly, and give you a clear checklist to make sure you're properly protected.

This is the single most expensive mistake homeowners make, and it's more common than you'd think. Underinsuring your home means your policy's dwelling coverage limit is lower than what it would actually cost to rebuild your house from the ground up.

The confusion usually comes from a misunderstanding between two numbers:

• Market value: What your home would sell for on the open market. This includes the land, the neighbourhood, school district, proximity to transit — factors that have nothing to do with construction costs.
• Replacement cost: The amount it would cost to demolish the remains and rebuild your home to its current condition using current labour rates and materials, while meeting today's building codes.

In many Canadian markets, the replacement cost and market value are very different numbers. A home in a rural area might sell for $350,000 but cost $500,000 to rebuild. Conversely, a small condo in downtown Toronto might sell for $800,000 but only require $200,000 in structural replacement coverage.

If you insure based on market value rather than replacement cost, you could face a massive shortfall after a total loss. Worse, many policies include a co-insurance clause — if your coverage is below a certain percentage of the true replacement cost (typically 80%), the insurer can reduce your payout proportionally, even on partial claims.

How to avoid this:

• Ask your insurer to run a replacement cost estimator using your home's square footage, construction type, finishes, and local labour rates
• Update your estimate after any renovation — a $40,000 kitchen remodel increases your replacement cost by roughly the same amount
• Review your dwelling limit annually; construction costs in Canada have risen significantly in recent years

To understand how these costs break down, see our guide on home insurance costs in Canada for 2026.

Most homeowners read their policy's declarations page — the summary that shows their coverage limits, deductible, and premium. Very few read the exclusions section. This is where the real surprises hide.

A standard Canadian home insurance policy (often called a "comprehensive" or "all-perils" policy) covers a wide range of events. But it explicitly excludes several common causes of loss:

• Sewer backup and drain overflow: One of the most frequent claims in Canadian homes — and it's excluded from most base policies. You need a separate endorsement.
• Overland flooding: Water entering your home from rising rivers, lakes, or overwhelmed storm drains is typically excluded. Flood endorsements are available but not always included by default.
• Earthquake damage: Not covered in standard policies. Essential in British Columbia and other seismically active regions.
• Gradual water damage: A slow leak behind a wall that causes mould over months? Usually excluded. Insurance covers sudden and accidental events, not maintenance failures.
• Home-based business equipment and liability: If you run a business from home, your standard policy may not cover business equipment or liability arising from business activities.

The cost of not understanding your exclusions can be staggering. A sewer backup alone can cause $20,000 to $50,000 in damage to a finished basement. Without the endorsement — which typically costs just $50 to $150 per year — you'd pay the full amount yourself.

For a complete breakdown, read our article on 10 things your home insurance doesn't cover.

How to avoid this:

• Read your policy's exclusions section — or ask your broker to walk you through it
• Ask specifically about water-related exclusions, which account for the majority of denied claims in Canada
• Don't assume "comprehensive" means "everything" — it doesn't

It's natural to want to save money on insurance. But choosing a policy based solely on the lowest premium is one of the most common — and costly — home insurance mistakes Canadians make.

Two policies with very different premiums can look similar on the surface, but the cheaper one often achieves its lower price by:

• Higher deductibles: A policy with a $2,500 deductible will cost less than one with a $1,000 deductible — but you'll pay more out of pocket on every claim.
• Lower coverage limits: Your dwelling limit, personal property coverage, or liability limit may be reduced.
• Named-perils instead of all-perils: A named-perils policy only covers events specifically listed (fire, theft, windstorm, etc.). An all-perils policy covers everything except what's explicitly excluded — a much broader protection.
• Actual cash value instead of replacement cost: An ACV policy deducts depreciation from your payout. A 10-year-old roof destroyed by a storm might only pay out 40% of what a new roof costs.
• Fewer included endorsements: Water backup, identity theft, or equipment breakdown coverage may be stripped out.

The difference between a $1,200/year and a $1,500/year policy might be $300 annually — but the cheaper policy could leave you $50,000 short when you need it most.

How to avoid this:

• Always compare policies on coverage, not just price
• Request quotes with the same coverage limits and deductibles from multiple insurers so you're comparing equivalent products
• Pay attention to whether the policy is all-perils or named-perils, and whether it pays replacement cost or actual cash value
• Ask what endorsements are included versus optional

Your home insurance policy is a snapshot of your home and lifestyle at the time you bought it. But homes change — and when your home changes and your policy doesn't, insurance coverage gaps appear.

Common changes that require a policy update:

• Renovations and additions: A new kitchen, finished basement, added bathroom, or deck increases your home's replacement cost. If you don't update your dwelling limit, you're underinsured.
• Major purchases: Buying expensive jewelry, electronics, art, or musical instruments may exceed your policy's sub-limits for those categories. You may need a scheduled items endorsement.
• Installing a pool, trampoline, or hot tub: These increase your liability risk. Your insurer needs to know — and your liability limit may need to increase.
• Starting a home-based business: Standard policies typically exclude business equipment and business-related liability. You may need a home-based business endorsement or a separate commercial policy.
• Changes to building codes: Local building codes evolve. If your home is destroyed and must be rebuilt to current code, the cost may be significantly higher than what your policy covers. A bylaw coverage endorsement addresses this gap.
• Extended vacancy: If you leave your home unoccupied for an extended period (typically 30+ days), most policies reduce or eliminate coverage. Snowbirds heading south for the winter need to be especially careful.

How to avoid this:

• Notify your insurer before starting any renovation over $10,000
• Review your policy annually — treat it like a financial check-up
• Keep an updated home inventory with photos, receipts, and estimated values
• Ask your broker whether any life changes in the past year affect your coverage

When you receive a home insurance quote, you'll often see a list of optional endorsements (also called riders or add-ons). Many homeowners skip them to keep their premium low. This is a false economy.

Optional endorsements exist because certain risks aren't covered by standard policies but affect a large number of homeowners. The most important ones to consider:

Sewer and Water Backup

This is the endorsement most Canadians should never skip. Sewer backup is one of the most common causes of home damage in Canada, especially in older homes and areas with aging municipal infrastructure. The endorsement typically costs $50 to $150 per year and can cover $10,000 to $100,000+ in damage.

Overland Flood

If you live near a river, lake, or in a flood-prone area, overland flood coverage is essential. Climate change has increased the frequency and severity of flooding events across Canada. This endorsement covers water entering your home from rising bodies of water or overwhelmed drainage systems.

Earthquake

Critical for homeowners in British Columbia and parts of Quebec and Ottawa. Standard policies exclude earthquake damage entirely. Given the catastrophic potential, this endorsement is worth serious consideration in seismically active regions.

Identity Theft and Cyber Protection

A newer endorsement that covers expenses related to identity theft — legal fees, lost wages, credit monitoring, and document replacement costs. With identity theft incidents rising across Canada, this low-cost add-on provides valuable peace of mind.

Scheduled Items (Valuable Property)

Standard policies cap payouts for certain categories: typically $2,000–$6,000 for jewelry, $2,000–$5,000 for collectibles. If you own a $15,000 engagement ring or a $10,000 watch, you need a scheduled items endorsement to insure them at their full appraised value.

How to avoid this mistake:

• Review every optional endorsement your insurer offers — don't dismiss them without understanding what they cover
• Calculate the cost-to-benefit ratio: a $75/year endorsement that protects against a $30,000 loss is an obvious investment
• Ask your broker which endorsements they recommend for your specific home, location, and situation

Use this checklist every time you buy or renew your home insurance to make sure you're properly protected:

1. Verify your replacement cost. Ask your insurer to calculate your home's replacement cost — not its market value. Update this number after every renovation or major change.
2. Read the exclusions. Ask your insurer or broker to explain exactly what your policy does not cover. Pay special attention to water-related exclusions.
3. Compare coverage, not just price. When shopping for quotes, ensure you're comparing equivalent coverage levels: same deductibles, same perils coverage (all-perils vs. named-perils), same valuation method (replacement cost vs. actual cash value).
4. Update your policy after changes. Notify your insurer about renovations, major purchases, new structures (pools, decks), and lifestyle changes (home business, extended travel).
5. Review optional endorsements. At minimum, evaluate sewer backup, overland flood, and scheduled items coverage. Ask your broker which endorsements are most relevant to your home and region.
6. Maintain a home inventory. Keep a detailed list of your belongings with photos, receipts, and estimated values. Store a copy outside your home (cloud storage or with a family member). This makes the claims process faster and ensures you don't underestimate your personal property coverage needs.
7. Review your policy annually. Construction costs, building codes, and your personal circumstances change over time. An annual review ensures your coverage keeps pace.
8. Ask questions. If you don't understand a term, a limit, or an exclusion — ask. A good broker will explain everything in plain language. Insurance is too important to guess about.

For a detailed look at what your home insurance does and doesn't include, see our guide on what home insurance covers in Canada.

The five home insurance mistakes we've covered — underinsuring, ignoring exclusions, chasing the cheapest premium, failing to update your policy, and skipping important endorsements — are all entirely avoidable. They don't require expertise or hours of research. They require asking the right questions and taking 30 minutes once a year to review your coverage.

The best time to find out you have an insurance coverage gap is before you need to make a claim — not after. A little due diligence now can save you tens of thousands of dollars and an enormous amount of stress later.

Home insurance isn't just a box to check for your mortgage lender. It's the financial safety net that protects your most valuable asset. Make sure it's strong enough to catch you.

Ready to see what proper coverage actually costs? Get a transparent home insurance quote and compare your options in minutes — no phone calls, no hidden gaps.