ARV Mistakes That Kill Deals
The After-Repair Value is the foundation of every deal analysis. Get it right and everything else falls into place: your offer price, your rehab budget, your marketing price, your buyer's confidence. Get it wrong and one of two things happens: you overpay and lose money, or you undervalue and miss a good deal. Both cost you.
Here are the ARV mistakes that experienced investors see most often, and how to avoid each one.
Mistake 1: Using the highest comp as your ARV
This is the most common ARV mistake, especially among newer investors who want the deal to work. You find five comps. Four sold between $240K and $260K. One sold for $295K. If you use $295K as your ARV, you've just inflated your value by $35K-$55K, which means you'll overpay for the property or price it too high for your buyers.
The fix: use the median of your adjusted comps, not the highest. If you have an outlier on the high end, investigate why. Maybe that comp had a premium lot, a finished basement, or seller financing that inflated the price. If you can't explain the outlier, exclude it. Your ARV calculation should be based on what a typical renovated property sells for, not the best-case scenario.
Mistake 2: Using comps from a different neighborhood
A comp that's 2 miles away might be in a completely different market. School district boundaries, HOA communities, flood zones, and neighborhood reputation can create sharp value breaks within a short distance. A property at $280K in one subdivision might comp at $220K two blocks away if it's in a different school zone.
The fix: prioritize comps within the same subdivision or neighborhood. If you must expand your search radius, make sure the comps are in areas with similar buyer demographics, school districts, and market dynamics. Use the map view in your comp analysis tool to visually verify that comps are in comparable locations.
Mistake 3: Ignoring the condition gap
Your subject property needs a full renovation. Your comp was already renovated when it sold. That's the correct comparison for ARV purposes since you want to know the after-repair value. But what if your comp was a builder-grade renovation and you're planning a basic cosmetic rehab? The gap between a fully renovated property and your planned renovation level could be $20K-$40K.
The fix: match comp condition to your planned renovation level. If you're doing a cosmetic rehab (paint, flooring, fixtures), don't use comps that were gut-renovated with custom finishes. Make condition adjustments when the renovation level differs.
Mistake 4: Using stale comps without time adjustment
A comp from 10 months ago reflects the market 10 months ago, not today. In a rising market, stale comps understate current value. In a declining market, they overstate it. Either way, failing to adjust for market conditions over time introduces error.
The fix: apply a market conditions adjustment to comps older than 3 months. If the market has appreciated 6% annually, a comp from 9 months ago needs approximately a 4.5% upward adjustment. If the market has declined 3% over the past year, adjust downward proportionally. Check local market reports from your MLS or realtor association for appreciation/depreciation rates.
Mistake 5: Cherry-picking comps to make the deal work
Confirmation bias is real. When you've found a property you want to buy, you'll unconsciously gravitate toward comps that support a higher value and dismiss ones that don't. An experienced investor once said: "The comps don't lie, but investors lie to themselves about the comps."
The fix: pull all comps first without looking at the deal economics. Analyze them objectively before you calculate whether the deal works at that value. If the honest ARV doesn't support the asking price, either negotiate harder or move on. Don't manipulate the comps to fit the deal you want.
Mistake 6: Forgetting about concessions
A comp might show a $280K sale price, but if the seller paid $8K in closing costs, the effective price was $272K. In some markets, seller concessions are common, especially in buyer's markets. If multiple comps include concessions that aren't reflected in the recorded sale price, your ARV will be inflated.
The fix: check MLS data for seller concessions on each comp. Reduce the effective sale price by the concession amount before using it in your analysis. MLS records typically include this information in the sale details or agent remarks.
Mistake 7: Comparing unrenovated to renovated
This sounds obvious, but it's surprisingly common. An investor finds a "comp" that sold for $180K, notes it's similar in size and location, and uses it. But that $180K sale was an unrenovated property sold to another investor. The actual ARV for a renovated version of that property is $260K. Using $180K as a data point drags the ARV down incorrectly.
The fix: for ARV analysis, only use comps that are in renovated condition (or adjust unrenovated comps upward for the cost of renovation). The purpose of ARV is to estimate what the property is worth after repairs, so your comps should reflect that finished state.
Mistake 8: Ignoring days on market
A comp that sold in 5 days at $290K tells a different story than one that sat for 180 days before selling at $290K. The first suggests the price was at or below market. The second suggests it was initially overpriced and the eventual sale price might be at the lower end of the market range.
The fix: weight comps by days on market. Properties that sold quickly at or above list price are stronger indicators of market value than those that required extended marketing and price reductions. For a deeper analysis, see our guide on what days on market tells you.
Mistake 9: Using too few comps
One comp is not enough. Two comps might give you a range but no confidence. Three is the minimum. Five or more is better. Using a single comp puts your entire analysis on one data point. If that one comp had unusual circumstances (motivated buyer, bidding war, seller financing), your ARV is wrong.
The fix: use at least 3-5 comparable sales. If you can't find that many, expand your search criteria or use supplementary methods. See our guide on what to do when comps don't exist.
Mistake 10: Not adjusting for property type
A townhome is not a single-family house. A condo is not a townhome. Even within single-family homes, a 2-story comp isn't a perfect match for a 1-story subject because many buyers prefer single-story homes and will pay a premium for them (or at minimum, the buyer pools differ).
The fix: match property type first. Only use different property types when no same-type comps exist, and make appropriate adjustments. Typical adjustments between types:
- 1-story premium over 2-story: $5K-$15K (market dependent)
- Detached vs attached: $10K-$30K
- Condo vs townhome: $10K-$20K
Mistake 11: Trusting automated valuations
Zillow's Zestimate, online AVM tools, and automated appraisal models are useful for a quick sanity check but unreliable for deal-level accuracy. Their median error rate is 3-7% nationally, which on a $300K property is a $9K-$21K swing. On distressed properties with unusual characteristics, the error can be much larger.
The fix: always run your own comp analysis using actual comparable sales. Use automated valuations only as a starting reference point, never as your primary ARV. Deal Run's ARV calculator uses real comp data to give you a defensible value estimate.
Mistake 12: Not accounting for market direction
Your ARV isn't just about what similar properties sold for recently. It's about what your property will sell for in 3-6 months when the renovation is complete. If the market is declining, your actual exit price will be lower than what current comps suggest. If it's appreciating, you might be pleasantly surprised, but banking on appreciation is risky.
The fix: for flips with a 3-6 month timeline, adjust your ARV for the expected market direction. If values are declining 1% per month, reduce your ARV by 3-6%. If you're unsure about market direction, use current values and don't factor in appreciation. For a deeper analysis, see our guide on calculating ARV in declining markets.
The ARV accuracy checklist
Before finalizing your ARV, confirm:
- Used at least 3 comparable sales (preferably 5)
- All comps are in the same neighborhood or equivalent location
- All comps match the planned post-renovation condition
- Comps older than 3 months adjusted for market conditions
- Seller concessions accounted for
- No cherry-picked outliers inflating the value
- Days on market reviewed for each comp
- Property type matched (or adjusted)
- ARV represents the median of adjusted comps, not the highest
- Market direction considered for your exit timeline
Use the comp analysis tool to systematically check each of these factors.
Related articles
- How to Calculate ARV Step by Step
- Comp Adjustments: A Practical Guide
- How to Run Comps Like a Pro
- Common Deal Analysis Mistakes