If you’re a homeowner in Chilliwack, Abbotsford, Langley, or Mission, you’ve likely received your annual BC Assessment notice and wondered what all those numbers actually mean. More importantly, you might be asking whether the assessed value on that notice actually reflects what your home is worth.
Here’s what you need to know about how BC Assessment works, where they get their information, and how to verify that the details about your property are accurate.
What BC Assessment Actually Is
BC Assessment is a provincial Crown corporation responsible for valuing every property in British Columbia. They assess roughly 2.2 million properties across the province each year, including every home, condo, and piece of land in the Fraser Valley.
Your assessed value serves one primary purpose: calculating your share of property taxes. It’s not a market appraisal, and it’s not necessarily what your home would sell for today. Think of it as a snapshot of what your property could have sold for on July 1 of the previous year, based on market conditions at that specific moment in time.
For 2025 assessments (the ones mailed in January 2025), BC Assessment looked at market values as of July 1, 2024. According to BC Assessment’s regional roll summaries, the Fraser Valley showed relative market stability, with most areas experiencing modest changes in the -5% to +5% range.
Why You Need to Verify Your Property Details
Here’s what many Fraser Valley homeowners don’t realize: BC Assessment’s records for your property might not be completely accurate. Since they use a mass appraisal system and assess over 2 million properties annually without physically inspecting each one every year, errors happen more often than you’d think.
These aren’t small rounding errors. We’re talking about mistakes that can cost you hundreds or thousands of dollars in property taxes every single year—money you shouldn’t be paying.
Local Property Size Over Estimated by 19%
In one Abbotsford property we reviewed, BC Assessment’s records showed the lot size approximately 1,470 square feet larger than municipal GIS measurements indicated, a discrepancy of roughly 19%. When we cross-referenced the city’s GIS system (which showed 716.2354 square meters, or approximately 7,710 square feet), it didn’t match BC Assessment’s records showing 9,180 square feet.
BC Assessment showing lot size at 9185 Sq Ft
Abbotsford Webmap GIS Reporting 716.234 m2 (7,710 sq ft)
This kind of discrepancy can significantly impact assessed value. In typical Fraser Valley markets, an extra 1,470 square feet of lot size could add tens of thousands of dollars to the assessment—and by extension, annual property taxes.
The property owner had been paying taxes on a lot size they didn’t actually have. Multiply that overpayment by 5, 10, or 15 years, and you’re looking at real money.
Other Common Errors We See
Lot size isn’t the only place mistakes happen. We regularly see:
- Unfinished basements counted as finished square footage – adding value for space that isn’t actually livable
- Garages or outbuildings that were demolished years ago – still being assessed as if they exist
- Renovations that were never done – attributed to your property by mistake
- Finished basements that aren’t recorded – meaning you might actually be undervalued (which seems good for taxes but creates issues when you sell)
- Incorrect number of bathrooms or bedrooms – basic facts that affect value
- Wrong property condition ratings – your home rated as “good” when it needs significant work, or rated as “average” when you’ve done extensive renovations
The bottom line: BC Assessment is good at what they do, but they’re working with imperfect information and mass appraisal models. It’s worth 30 minutes of your time to verify their records are correct.
How to Verify Your Property Details
Here’s your step-by-step process for checking BC Assessment’s records against reality.
Step 1: Check Your Assessment Online
Visit bcassessment.ca and search for your property by address. You’ll find:
- Your property’s assessed value
- The previous year’s value for comparison
- Property classification (residential, commercial, etc.)
- Basic property details
Step 2: Get Your Property Valuation Summary
For more detailed information, request a Property Valuation Summary from BC Assessment (sometimes called a property description). This document includes specific details about your property that BC Assessment used to determine your value, such as:
- Exact lot size in square feet or acres
- Building size and square footage
- Number of rooms and bathrooms
- Age of the home and any additions
- Features like garages, decks, and finished basements
- Construction quality and condition ratings
Step 3: Double-Check These Key Details
Don’t just trust that BC Assessment has everything right. Cross-reference their information with your own records and municipal data sources. Many Fraser Valley municipalities provide free online GIS mapping tools that show precise lot dimensions and measurements—these can be invaluable for verifying BC Assessment’s records.
Lot size: This is one of the most common errors. Pull out your property’s legal description or title documents and compare the lot size BC Assessment has on file. If they have you listed at 6,000 square feet when your actual lot is 8,500 square feet, you might be undervalued (which sounds good for taxes but could create issues when you sell). Conversely, if they’ve overstated your lot size, you could be paying more in property taxes than you should.
How to verify lot size yourself: Most Fraser Valley municipalities offer free online GIS (Geographic Information System) mapping tools. For Abbotsford properties, visit the City of Abbotsford’s GIS portal. For Chilliwack, check the City of Chilliwack’s mapping system. For Langley, the Township and City both have mapping tools available. Simply search your address and the system will display your lot dimensions and total area. Compare this to what BC Assessment has on file—if there’s a significant difference, that’s something worth correcting.
Building square footage: Measure your home’s finished living space and compare it to BC Assessment’s records. Not all square footage is valued equally, and understanding what counts can help you verify your assessment is accurate.
What counts toward your assessed value:
- Main floor living space: All finished, heated rooms on your main floor(s)
- Upper floors: Second stories, third stories, and finished loft spaces
- Finished basements: Below-grade space that’s been properly finished with drywall, flooring, heating, and proper egress (windows/exits)
- Legal suites: Secondary suites that have been properly permitted and meet building code requirements – these add significant value
- Attached heated spaces: Sunrooms, enclosed porches, or additions that are heated and finished to the same standard as the main house
What’s valued differently or doesn’t count the same way:
- Unfinished basements: These are typically noted in the assessment but valued much lower than finished space – sometimes they’re not included in the main square footage at all
- Partially finished basements: If only part of your basement is finished, only that portion should count as finished square footage
- Garages (attached or detached): These add value as a separate feature but aren’t counted as living space
- Workshops and storage buildings: Valued separately as outbuildings, not as home square footage
- Crawl spaces: Not counted toward living space
- Unpermitted additions: If you added space without permits, BC Assessment may not have this on file – though they may still identify it through aerial imagery
- Illegal suites: BC Assessment may recognize the additional finished space, even if the suite is unpermitted, though this can create legal, insurance, and financing complications
- Unheated spaces: Three-season sunrooms, unheated porches, or covered decks are valued differently than heated living space
- Ceiling height: Basement spaces with very low ceilings (under 6.5 feet typically) may not qualify as living space
Common square footage errors to watch for:
- BC Assessment showing an unfinished basement as finished square footage
- Confusing total building footprint with finished living space
- Including garage square footage in the home’s main square footage
- Not accounting for a recently finished basement (if permits were pulled after October 31)
- Including an unpermitted suite that BC Assessment hasn’t identified
If BC Assessment shows 2,400 square feet but 800 of that is an unfinished basement, that’s an error worth correcting. Similarly, if you finished your basement in 2023, pulled permits, and it’s still shown as unfinished in your 2025 assessment, you should contact BC Assessment to have this updated.
How to Correct Errors
If you find incorrect information on your assessment, you have two options:
Submit a Data Validation Form: For simple factual errors (wrong lot size, incorrect square footage, missing or extra outbuildings), you can complete and submit a Data Validation Form through BC Assessment’s website. This is a straightforward way to correct obvious mistakes.
Contact BC Assessment directly: Call 1-866-825-8322 to speak with an appraiser. Many issues can be resolved over the phone, especially if there’s a clear error in their records. BC Assessment staff can often make adjustments without needing a formal appeal.
How BC Assessment Determines Your Property’s Value
BC Assessment uses what’s called a “mass appraisal system.” Instead of sending an appraiser to inspect each individual property every year, they group similar properties together and use market-based models to estimate values. Here’s how the process works:
Data Collection
Throughout the year, BC Assessment gathers information from multiple sources:
Recent sales data: They analyze every property transaction in your area, looking at what similar homes actually sold for. If several homes on your street sold for higher prices between July 2023 and July 2024, that trend will likely be reflected in your 2025 assessment.
Building permits: When you pull a permit for a renovation, addition, or new construction, BC Assessment gets notified. Major upgrades like finishing a basement, adding a suite, or building a garage will typically increase your assessed value because they increase your home’s market value.
Aerial imagery: BC Assessment uses aerial photography to identify changes to properties. If you’ve added a deck, built a shop, or made other visible improvements, they can spot these changes from above.
Land title information: They verify ownership details and property boundaries through the Land Title and Survey Authority.
Site visits: While assessors don’t visit every property annually, they do conduct physical inspections for new construction, significant renovations, or when property details need verification.
Property owner reports: Homeowners can report changes to their properties directly to BC Assessment, which helps ensure accuracy.
The Valuation Process
BC Assessment considers several factors when determining your property’s value:
Highest impact on value:
- Location: Properties in more desirable neighborhoods command higher values. A home near schools, parks, and amenities in downtown Chilliwack will typically be valued differently than a similar home in a more rural setting
- Comparable sales: This is the most significant factor. BC Assessment looks at what similar properties in your area actually sold for during the relevant time period
- Lot size: Larger lots generally mean higher values, particularly in the Fraser Valley where land is at a premium. A 7,000-square-foot lot will be assessed differently than a 15,000-square-foot lot in the same neighborhood
Significant impact on value:
- Property size and layout: Total finished square footage, number of bedrooms and bathrooms, and overall floor plan
- Age and condition: Newer homes or recently renovated properties typically have higher values than older homes in original condition
- Major features: Garages, finished basements, legal suites, quality of construction
Moderate impact on value:
- Upgrades and renovations: Updated kitchens, bathrooms, flooring, windows
- Outbuildings: Shops, detached garages, barns (for rural properties)
- View and topography: Mountain views, water views, or challenging terrain
- Outdoor features: Decks, patios, in-ground pools, extensive landscaping
Minimal or no impact on value:
- Interior paint colors: Fresh paint is nice but doesn’t change assessed value
- Furniture and staging: How you decorate doesn’t affect BC Assessment
- Small appliances and fixtures: Minor updates like new faucets or light fixtures
- Portable items: Sheds that aren’t on foundations, temporary structures
How Assessments Impact Your Property Taxes (And Your Mortgage)
Here’s an important point that often causes confusion: a higher assessment doesn’t automatically mean higher property taxes.
Property taxes are calculated by multiplying your assessed value by the municipal tax rate. If your home’s value increased by 5% but the average increase in your municipality was also 5%, your share of the total tax burden stays roughly the same. The municipal tax rate adjusts each year based on the municipality’s budget needs and the total assessed value of all properties in the area.
However, your BC Assessment does matter when it comes to mortgages:
Refinancing: When you’re looking to refinance your mortgage or access home equity, lenders will often reference your BC Assessment as a starting point. However, they’ll typically require a formal appraisal to determine your home’s current market value and how much equity you can access.
Purchase Plus Improvements: If you’re considering a Purchase Plus Improvements mortgage to buy a home and immediately renovate it, understanding how those improvements will affect both your market value and future BC Assessment is important for planning.
Property taxes in your mortgage payment: If your property taxes are included in your monthly mortgage payment (held in a tax account), an increase in your assessment could lead to higher monthly payments if it results in higher taxes.
How Your Assessment Fits Into Your Overall Financial Picture
Your BC Assessment is just one piece of your property’s financial story. Whether you’re planning to refinance, considering renovations, or thinking about leveraging your home equity, understanding the difference between your assessed value and your actual market value is important.
When you’re ready to explore mortgage options, whether that’s refinancing, accessing equity through a HELOC, or funding renovations, working with a local mortgage broker who understands the Fraser Valley market means you’ll get advice based on real market conditions, not just assessment values.
At Browne Mortgage, we help Fraser Valley homeowners navigate the gap between assessed values and market realities. We can connect you with current market data for your specific area, explain how your home’s value impacts your mortgage options, and help you make informed decisions about leveraging your home equity.
Key Takeaways
BC Assessment provides a standardized valuation for property tax purposes, but it’s not a substitute for understanding your home’s actual market value. Take the time to review your assessment notice when it arrives, verify that the property details are accurate (especially lot size and square footage), and don’t hesitate to contact BC Assessment if you spot errors.
As we showed with the Abbotsford example earlier, discrepancies of 1,000+ square feet in lot size aren’t uncommon and can cost you hundreds or even thousands of dollars in unnecessary property taxes over time. Use your municipality’s GIS mapping tools to verify these details yourself.
Your home is likely your largest financial asset. Making sure the details are correct and understanding how your assessment fits into your broader financial plans is worth the effort.
If you have questions about how your home’s value impacts your mortgage options, or if you’re considering refinancing, renovating, or accessing your home equity, reach out to our team. We’re local to the Fraser Valley, we understand the market in Chilliwack, Langley, Mission, and Abbotsford, and we’re here to help you make the most of your home ownership journey.
Have questions about your BC Assessment or how it impacts your mortgage options? Contact Browne Mortgage to speak with a local expert who understands the Fraser Valley market.
