Disclaimer:
The information on this website is for general guidance only. Property valuations are estimates and actual borrowing capacity depends on lender assessment. Seek advice from a qualified mortgage adviser for accurate assessment.
Key Takeaways
- Total equity is property value minus all secured debt.
- Useable equity is limited by lender LVR rules, usually a 20% buffer.
- Accurate valuations matter, especially for larger lending decisions.
- Equity changes with principal repayments and property value movements.
- Accessing equity should align with clear goals and risk tolerance.
Your home equity equals your property's current market value minus the amount you owe on it. If your home is worth $800,000 and you owe $450,000, you have $350,000 in total equity. However, not all of this is accessible for borrowing. Lenders typically require you to retain at least 20% equity, meaning your useable equity is your total equity minus 20% of your property value.
Equity represents wealth you have built through mortgage payments and property value changes. Understanding your equity position helps you evaluate financial options including refinancing, funding renovations, property investment, or simply knowing where you stand financially.
The Basic Equity Calculation
Calculating your total equity requires two numbers: your property's current value and your mortgage balance. The difference between these figures is your equity.
Step 1: Estimate Your Property Value
Several sources can help you estimate your property's current value. Online valuation tools from sites like Homes.co.nz, OneRoof, and realestate.co.nz provide estimates based on recent sales and property data. Your council's rating valuation (RV) provides another reference, though RVs can be several years old and may not reflect current market conditions.
For more accurate figures, consider a desktop valuation from a registered valuer, typically costing $100 to $200, or a full valuation with property inspection, costing $400 to $700. Lenders often require a formal valuation for significant lending decisions.
Valuation Methods:
Online estimates: Free, instant, but accuracy varies. Desktop valuation: $100-$200, uses property data without inspection. Full valuation: $400-$700, includes physical inspection, most accurate for lending purposes.
Step 2: Check Your Mortgage Balance
Your current mortgage balance appears on your latest loan statement or through your bank's online banking. This is the principal amount you still owe, not including any prepaid interest or fees. If you have multiple loan portions, add them together for your total debt.
Remember to include any other debts secured against your property, such as a separate line of credit or revolving credit facility. All secured debt counts against your equity position.
Step 3: Calculate Total Equity
Subtract your total secured debt from your estimated property value. The result is your total equity position.
Example Calculation:
Property value: $850,000
Mortgage balance: $480,000
Total equity: $370,000
Understanding Useable Equity
Total equity and useable equity are different things. Lenders will not let you borrow against all your equity. They require you to maintain a minimum equity buffer, typically 20% of your property's value. This protects both you and the lender against property value fluctuations.
The 80% LVR Rule
Loan-to-Value Ratio (LVR) measures your total lending as a percentage of property value. Most lenders limit standard residential lending to 80% LVR, meaning you must retain at least 20% equity. Higher LVR lending may be possible in some circumstances but typically comes with restrictions and higher rates.
To calculate useable equity, determine the maximum you could borrow at 80% LVR, then subtract what you currently owe. The difference is equity you could potentially access.
Useable Equity Example:
Property value: $850,000
Maximum borrowing at 80% LVR: $680,000
Current mortgage: $480,000
Useable equity: $200,000
This is $170,000 less than the total equity of $370,000, because you must retain 20% ($170,000) as a buffer.
Factors That Change Your Equity
Your equity position shifts over time based on several factors. Understanding these helps you anticipate changes and make informed decisions.
Need personalised guidance?
Chat with a Homeowners Club affiliated mortgage adviser, conveyancer, insurance adviser, or builder — no obligation.
Have a question about this?
Post it in the Homeowners Club forum — get answers from the community and industry professionals.
Mortgage Payments
Each principal payment you make reduces your mortgage balance and increases your equity by the same amount. Interest payments do not affect equity as they do not reduce your principal. This is why paying extra principal accelerates equity growth.
Property Value Changes
When property values rise, your equity increases without any action on your part. This is often the larger contributor to equity growth in strong markets. Conversely, falling property values reduce equity. Homeowners who bought near market peaks may have less equity than expected if values have subsequently declined.
Market Volatility Warning:
Property values can decrease as well as increase. Making borrowing decisions based on current high valuations is risky if values subsequently fall. Conservative borrowing that leaves a reasonable buffer protects you against market corrections.
Renovations and Improvements
Quality renovations can increase your property's value, boosting equity. However, not all renovation spending translates to equivalent value increase. Some improvements add more value than they cost while others represent consumption rather than investment. Understanding which renovations add value helps you make smart improvement decisions.
What Can You Do with Your Equity?
Once you understand your equity position, you can evaluate potential uses. Accessing home equity through mortgage top-ups, revolving credit facilities, or refinancing opens various possibilities.
Common uses include funding renovations, purchasing investment property, consolidating other debts, or providing a financial buffer for life events. Each use has different risk and return profiles. Equity is a valuable resource that should be deployed thoughtfully, not simply because it is available.
Using an Equity Calculator
While you can calculate equity manually using the steps above, an equity calculator makes the process faster and helps you explore different scenarios. You can adjust property values to see how market changes affect your position, or model the impact of accelerated payments on future equity.
Our equity calculator shows your total equity, maximum borrowing at 80% LVR, and useable equity based on the figures you provide. Use it as a starting point for understanding your position before seeking formal valuation or lender assessment.
Frequently Asked Questions
Related Articles
Unlocking Your Home Equity: Smart Ways to Access Your Property's Value
Learn how to access your home equity through revolving credit, mortgage top-ups, or equity release. Understand which method suits your goals
Using Home Equity to Build an Investment Portfolio
Learn how NZ homeowners use accumulated home equity for investment properties, shares, or other wealth-building strategies. Understand the r