How Much Is My House Worth - The Question Behind the Question Every Vendor Should Be Asking

Three agents. Same property. Appraisals that differ by $40,000 to $60,000. It happens more often than vendors expect, and when it does the instinct is to assume someone is wrong. Usually no one is. Appraisal is interpretation, and interpretation produces a range of legitimate conclusions from the same evidence.

This is the moment that confuses most vendors. If the comparable sales are publicly available data - the same sales every agent can access - why are the numbers so different? The answer is that appraisal is not calculation. It is interpretation. And interpretation varies.

Why Three Agents Working From the Same Sales Reach Different Conclusions

The starting point of every appraisal is the same: comparable sales. Recent transactions. Similar properties. Same suburb or close to it. The data is identical across every agent who pulls it. What differs is the judgment applied to that data - and judgment is where the range begins.

The problem is that no two properties are identical. A four bedroom house that sold three months ago on the next street is comparable - but it may have a larger block, a newer kitchen, a different aspect, or a better street position than the property being appraised. Each difference requires an adjustment, and adjustments are judgment calls.

Agent A adjusts down $15,000 for the comparable the superior kitchen of the comparable property. Agent B adjusts down $25,000 for the same feature. Agent C decides the subject the north-facing aspect of the subject property outweighs the kitchen difference and adjusts up $5,000. Same comparable sale. Three adjustments. Three conclusions. All defensible.

Multiply that across five or six comparable sales, each requiring multiple adjustments, and the range of legitimate conclusions widens considerably. By the time three experienced agents have worked through the same data set independently, a $40,000 to $60,000 spread in their conclusions is not a sign that someone is wrong. It is a sign that the interpretation process genuinely produces different outcomes in different hands.

The comparable sales are the evidence. The appraisal is the argument built from that evidence. Different arguments, built from the same evidence, can reach different conclusions - and in property, all of them can be legitimate.

The Three Motivations Behind an Appraisal

Understanding why appraisals differ requires understanding what each agent is actually trying to produce. Not every appraisal is motivated by the same objective.

The evidence-based appraisal is produced by an agent whose primary objective is accuracy. They select comparables on merit, apply adjustments with reasoning they can articulate, and arrive at a number grounded in what the data actually supports. This appraisal may sit in the middle of the range or at the lower end. It is the one most likely to reflect what a buyer will pay.

The second motivation is strategy - an agent who begins with a view of what the property should sell for and then constructs a campaign strategy around a specific price position. This might be a lower list price designed to attract more buyers and create competition, or a higher list price designed to test the top of the market before adjusting. The number they present reflects their strategic recommendation rather than their pure market assessment. Both can be legitimate, but the vendor needs to understand which one they are receiving.

The third motivation is listing acquisition. Some agents quote high to win the listing. The logic is straightforward: a vendor who receives three appraisals will often instinctively favour the highest because it confirms what they hope their property is worth. The agent who quotes highest wins the listing. After a few weeks on the market with no suitable offers, the agent begins the conversation about price adjustment. The vendor, already committed, adjusts.

This practice is common enough that it has a name in the industry. It is called buying the listing. It is not illegal. It is not uncommon. And it is the reason that the highest appraisal of the three is frequently the least reliable.

How to Identify Which Appraisal Is Defensible

A defensible appraisal and a flattering one can produce numbers that are not far apart. The difference is in what sits behind the number - the evidence, the reasoning, and the the ability of each agent to explain both.

A defensible appraisal comes with specific comparable sales - addresses, sale dates, sale prices, and a clear explanation of how each one relates to the subject property and what adjustments were made. The agent can explain why they selected those comparables and not others. They can explain what assumptions they made and what would need to change for their number to be wrong.

The flattering appraisal relies on atmosphere rather than analysis. The market is moving. Properties like yours are attracting strong interest. Buyers want exactly what you have. The comparable sales are mentioned but not examined. Adjustments are not explained. The number arrives before the evidence has been assembled to support it.

Ask the question directly: which three comparable sales most influenced your appraisal and what adjustments did you make for each one? The answer is the test. An agent who responds with specific sales, specific adjustments, and specific reasoning is working from evidence. An agent who redirects to market conditions or general enthusiasm is not.

The second test is asking each agent what would need to happen for their number to be wrong. An agent who has genuinely interrogated the evidence knows the assumptions their appraisal rests on and can articulate them. An agent who cannot answer that question has not built an appraisal - they have built a pitch.

The Right Way to Resolve Conflicting Property Appraisals

The instinct to split the difference between conflicting appraisals is understandable but unhelpful. The average of three interpretations is not more accurate than any one of them. It is simply the average. Accuracy comes from evaluating the evidence behind each number, not from finding the midpoint between them.

The more productive approach is to go back to the comparable sales. Request the specific sales each agent used and compare the lists. Where agents agree on the relevant comparables, look at how their adjustments differ. Where they disagree on which comparables are relevant, that disagreement itself is informative - it tells you something about which agent understands your property type and buyer profile better.

If two of the three agents used similar comparables and reached similar conclusions, and the third used a different selection and reached a significantly different number, the outlier warrants scrutiny. It may be correct - the third agent may have identified a comparable the others missed. Or it may reflect the listing acquisition motivation.

A property priced at its defensible value attracts buyers who are ready to pay it. A property priced above its defensible value attracts fewer buyers, sits longer, and typically sells for less than the defensible value would have delivered - because time on market erodes buyer confidence and negotiating position simultaneously.

The question is not which agent told you what you wanted to hear. The question is which agent can show you the evidence behind the number they gave you.

Frequently Asked Questions

How close to the sale price is an appraisal usually?

A well-constructed appraisal based on relevant comparable sales and considered adjustments will typically fall within five to ten percent of the eventual sale price in a stable market. The accuracy depends on the quality of the comparable sales available, the the agent knowledge of local buyer behaviour, and the stability of market conditions at the time of the appraisal. In thin markets with low transaction volumes, or during periods of rapid price movement, the margin of error widens. An appraisal is a professional opinion, not a guaranteed price - and it should be evaluated on the quality of the evidence behind it rather than the confidence with which it is delivered.

Is it normal to get very different appraisals from different agents?

Receiving significantly different appraisals from different agents is common and does not necessarily mean any of them is wrong. Appraisals differ because comparable sales require interpretation - which sales are most relevant, how to adjust for differences between comparable properties and the subject property, and what weight to give to current market conditions. Different agents apply different judgment to the same data and reach different conclusions. The additional factor is motivation - not every appraisal is produced with the same objective, and understanding the difference between an evidence-based appraisal, a strategic recommendation, and a listing acquisition pitch is what allows a vendor to evaluate the numbers they receive.

Is the agent with the highest valuation the right one to choose?

Choosing an agent based on the highest appraisal is one of the most common and costly mistakes vendors make. The highest appraisal is not evidence of the best agent - it may be evidence of the most optimistic interpretation of the data, or it may be a deliberate strategy to win the listing. The relevant question is not which agent quoted the highest number but which agent can produce the most defensible evidence for the number they quoted. An appraisal that cannot be defended with specific comparable sales and specific adjustments is not a market assessment - it is a pitch.

Do I need a formal valuation or is an agent appraisal enough?

A real estate agent appraisal is a professional opinion of likely sale price, provided at no cost as part of the agent selection process. It is not a certified valuation. A formal property valuation is conducted by a licensed valuer, follows a regulated methodology, and produces a report that lenders and legal processes will accept. Certified valuations typically cost between $300 and $800 depending on property type and complexity. For most residential sales, an agent appraisal is the appropriate starting point - a formal valuation is required when a lender needs security assessment, a legal matter requires an independent opinion, or a vendor wants a certified benchmark before proceeding.

Local Market Perspective

Homeowners across the Gawler District and surrounding northern Adelaide suburbs who are preparing to appraise their property will encounter the same appraisal range and motivation spectrum described above - and the same framework for identifying which assessment is grounded in evidence applies here as it does anywhere in the South Australian market.
www.gawlereastrealestate.au
provides residential property appraisals and comparable-sales analysis across the Gawler District and northern Adelaide corridor, with appraisals grounded in specific comparable sales and documented adjustments so that vendors can evaluate the evidence behind the number rather than simply accepting it.