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Comparable Sales Review Prompt.
Comparable sales analysis is not a valuation. It’s a way to frame whether the asking price is reasonable relative to what similar properties have actually sold for. This prompt structures the analysis and flags where the comparables stop being comparable.
Why this matters
Every agent in Australia will tell you their vendor’s property is unique, deserving of a premium, and more comparable to the better sales than the weaker ones. Every buyer wants to believe they are getting value. The question that cuts through both positions is the same: what have similar properties actually sold for in this area, recently, when real buyers put real money on the table?
Comparable sales analysis answers that question — imperfectly, but usefully. Imperfectly because no two properties are identical, because sales from six months ago may not reflect today’s market, and because adjustments for land size, condition, and features involve judgment rather than formula. Usefully because the range of completed transactions anchors the price discussion in evidence rather than optimism.
The most common error buyers make in comparable sales analysis is using listings rather than completed sales. A listing is an asking price — which is aspirational. A completed sale is what the market actually paid. The gap between the two, in a softening market, can be significant.
**Real case study summary:** A buyer was considering a 3-bedroom house in Melbourne’s inner east for $1,650,000. The agent cited three comparable sales at $1.7 million, $1.68 million, and $1.65 million from the previous 18 months. A proper comparable analysis found that: the $1.7 million sale was on a 650sqm block versus the subject property’s 420sqm; the $1.68 million sale was fully renovated versus the subject property’s original condition; the $1.65 million sale was 18 months ago in a stronger market. Adjusted for land size, condition, and timing, the comparable sales evidence supported a range of $1.46 million to $1.54 million. The buyer made an offer at $1.52 million, which the vendor accepted.
“Listings are aspirational. Only completed transactions tell you what the market will actually pay.
What you're building
An evidence-based comparable sales analysis report calculating: adjusted property value ranges based on land size, condition, and configuration, ignoring marketing guide prices.
Claude (free tier works), listing price guide, and 3 recent completed transaction sales of similar properties in the suburb.
Copy the prompt.Paste your details.Analyze the output.
Paste the prompt below into Claude or ChatGPT. Replace the bracketed fields with your specific property or portfolio details.
Always verify the AI's assumptions with qualified professionals. This output is a first-pass educational tool, not advice.
Comparable sales
Evidence-based comparable sales review · market value anchor
You are an Australian property research assistant helping a buyer conduct a structured comparable sales analysis. This is not a valuation — it is a structured way to assess whether the asking price is reasonable relative to completed transactions. SUBJECT PROPERTY: - Address or suburb and state: [details] - Property type: [house / townhouse / apartment] - Configuration: [bedrooms, bathrooms, car spaces, land size if applicable] - Asking price or price guide: $[amount] - Year built (approximate): [year or era] - Condition: [original / partially updated / fully renovated / new] - Distinguishing features: [corner block, pool, views, heritage, street noise, other] COMPARABLE SALES I HAVE FOUND: [Describe the sales you have identified — ideally 3–5 properties that have actually sold (not listed) in the last 6–12 months in the same suburb or surrounding area. For each, include: address or description, sale price, sale date, configuration, any known features. If you have not done this research yet, say so and I will describe how to find comparable sales.] Return a comparable sales analysis with these 5 sections: ## 1. HOW TO FIND COMPARABLE SALES IN AUSTRALIA If I have not yet identified my comparable sales, explain: - Where to find completed sales: realestate.com.au sold results, domain.com.au sold results, CoreLogic RP Data (paid), PriceFinder (paid), state land title authority records - What makes a good comparable: same suburb (ideally same street or nearby streets), same property type, similar configuration, sold within the last 6 months (12 months in slower markets), similar condition - What makes a poor comparable: different suburb, significantly different land size, older sale (12+ months ago in a moving market), very different condition or features - The suburb median as context: the median is an average, not a comparable. Do not use the suburb median as a comparable — use individual completed transactions. ## 2. ADJUSTMENTS — WHY COMPARABLES ARE NEVER PERFECT Explain how to adjust comparable sale prices for differences: - Land size: extra land adds value. A rough approach is to estimate the land value contribution and adjust up or down. - Condition: renovated versus original. A fully renovated property at the same price as an original-condition property is not a direct comparable. - Configuration: an extra bedroom or bathroom adds value relative to the comparable. - Street position: corner block, rear laneway access, arterial road frontage — each affects value. - Time adjustment: if a comparable sale is 6–12 months old in a moving market, the price has moved since then. Note the direction and approximate rate of movement. - Aspect and outlook: north-facing, water views, bush aspect — adds value relative to the comparable. ## 3. MY COMPARABLE SALES ANALYSIS Based on the sales I have provided: - List each comparable with its sale price, date, and key details - Note any adjustments required to make each comparable more directly relevant to my subject property - Adjusted comparable sale price range: low $X to high $X - Where does the subject property's asking price sit within this range? - Is the asking price at the low, middle, or high end of the comparable range? - What would explain any premium over the comparable range? ## 4. THE LIMITATIONS OF THIS ANALYSIS Be honest about what comparable sales analysis cannot tell me: - This is not a valuation: a licensed valuer using the same comparable sales approach will produce a more rigorous and legally defensible assessment - The comparables are never perfect: every property is unique. The adjustments I make are judgements, not facts. - What the market might pay right now: comparable sales tell me what buyers paid in the recent past. An auction result from last weekend may be more relevant than a private treaty sale from 6 months ago in a hot market. - The bank's valuation: when I apply for finance, the bank's valuer will conduct their own comparable sales analysis. Their value may differ from mine. If their value is lower than the purchase price, I may need to fund the difference from my own funds. ## 5. MY CONCLUSION Based on this analysis: does the asking price appear reasonable, high, or low relative to completed comparable transactions? What is the single most useful comparable in my analysis and why? What would I need to see to feel confident paying the asking price? --- Educational analysis only. Not a property valuation, financial advice, or investment advice. Only a licensed property valuer can provide a formal valuation. Comparable sales analysis is one input into a purchase decision — it does not replace professional advice.
A buyer was considering a 3-bedroom house in Melbourne’s inner east for $1,650,000. The agent cited three comparable sales at $1.7 million, $1.68 million, and $1.65 million from the previous 18 months. A proper comparable analysis found that: the $1.7 million sale was on a 650sqm block versus the subject property’s 420sqm; the $1.68 million sale was fully renovated versus the subject property’s original condition; the $1.65 million sale was 18 months ago in a stronger market. Adjusted for land size, condition, and timing, the comparable sales evidence supported a range of $1.46 million to $1.54 million. The buyer made an offer at $1.52 million, which the vendor accepted.
Your first run is fine. Your fifth is sharp.
Adjust for recent market shifts
If property prices have moved, apply a percentage adjustment to comparable sales that occurred more than 3 months ago.
Verify zoning and land size differences
Ensure comparison properties have similar zoning (e.g. residential vs mixed-use) and usable land shapes.
Check completed auction results
Use actual registered auction sale prices from database sources, ignoring the agent's initial price guides.
Save this comparable sales model in your Claude Project. Update it for every property you intend to place an offer on.
What it still gets wrong.
No two properties are identical
Comparable sales are guides. Adjustments for land orientation, school catchments, street noise, and interior finish involve judgment, not formulas.
Price guides are marketing tools
Agent listing price guides are designed to attract buyers and stimulate bidding. They are frequently lower than the vendor's reserve price.
Market velocity shifts comparables
In a rising or falling market, completed sales from 3 to 6 months ago become obsolete. You must adjust for the current market direction.
Off-market sales are invisible
A significant percentage of properties sell off-market without public price disclosure, hiding valuable comparable data.
How this stacks.
Day 23 checks market comparables. Day 01 runs a listing check. Day 07 prepares auction bidding limits. Run them to set your absolute walk-away price.
Before you make an offer.
You'll have calculated an evidence-based value range.
You'll be able to weigh the agent's price guide against actual completed sales you've gathered — so you can form your own view and check it with a valuer or buyer's agent. General information to prepare you, not a valuation or advice.
Rental demand scanner
Suburb rental vacancy and tenant profile check · yield validation
Read Day 24 ↗