Reading Comparable Sales to Price a Home
Every seller asks the same thing first: what is my house worth? Every buyer asks it too, a little more quietly. The honest answer begins with a handful of other houses, the ones that sold recently nearby, and an attempt to understand what buyers paid for them.
That sounds simple. It rarely is. A list of sales is only raw material, and two people can read the same list and reach prices tens of thousands of dollars apart. The skill lies in choosing the right sales, adjusting for differences, and knowing which numbers to ignore.
What a comparable sale is
A comparable, or comp, is a recently closed sale of a property similar to yours. Similar in what sense? Location, size, age, style, condition, lot and the features buyers care about. The sale must also be an ordinary one. A transfer between relatives, a distressed sale or an estate settlement at a discount may not reflect the open market.
Closed prices matter most. Asking prices are hopes. Pending sales are promises not yet kept. Active listings tell you about the competition, which is useful, but they do not tell you what buyers actually paid.
Choosing the set
Start tight and widen only when you must. Begin with the same neighborhood, and, where possible, similar blocks, because a street near a busy road and a street that ends in a cul-de-sac may behave quite differently. Then match style and size. A three-bedroom Cape does not fit neatly against a five-bedroom Colonial with a finished basement, even a quarter mile away.
Recency counts as well. Markets shift, so a sale from last month tells you more than one from last year. How far back to go depends on how many sales exist; where few homes trade, you may have to stretch the window, and say so honestly.
- Aim for three to six genuinely similar sales rather than a long, loose list
- Prefer the most recent closings
- Keep sales from the same general area unless nothing comparable exists
- Note any sale that looks unusual and decide whether to set it aside
Adjusting for the differences
No two houses match exactly, so appraisers and agents make adjustments. If a comp had a renovated kitchen and yours has the original, yours is likely to sell for less, all else equal. If your lot is larger, or your home has a garage the comp lacked, the reverse may apply.
The tricky part is the size of each adjustment. It should come from market evidence, such as paired sales that differ in one feature, and not from the cost of the upgrade. What a bathroom remodel cost the owner and what a buyer will add for it are different numbers. Buyers often pay less than the full cost of recent improvements, and sometimes more when the feature is scarce.
Features worth comparing:
- Finished living area, measured the same way for each home
- Bedroom and bathroom counts
- Condition and updates to kitchens, baths, mechanicals and the roof
- Lot size and usable outdoor space
- Garage, basement and attic
- Waterfront, water views or proximity to busy roads or railways
Reading square footage with care
Price per square foot is a handy shortcut and a risky one. Different sources count differently. Finished basements, attics and enclosed porches may or may not be included, and the figure may come from a tax record, a builder’s plan or a measured survey. Compare like with like, and verify the number for your own house before you rely on it.
Also remember that smaller homes tend to carry a higher price per square foot than larger ones, because kitchens and baths cost about the same regardless of size. A rate taken from a 1,200-square-foot house will undervalue a 3,000-square-foot one.
A worked example, described in words
Suppose you are pricing a three-bedroom Cape with one updated bathroom and an unfinished basement. You find four recent sales nearby. One has a gut-renovated kitchen and sold well above the rest; another needed everything and sold well below. The remaining two are close to your house in size and condition, and they landed within a narrow band of each other.
The first instinct is to average all four. The better move is to weight the two nearest matches, then use the outliers as brackets. The renovated sale shows roughly what an updated version of your home might reach; the tired one shows what a buyer will pay for a project. Your house sits between them, and where depends on how much of the gap your own updates close.
Write that reasoning down in a sentence or two. A range with a reason behind it is far easier to defend, to a buyer, a seller or an appraiser, than a single figure that came from nowhere.
Comps, CMAs and appraisals
Three things get confused. A comparative market analysis, or CMA, is prepared by an agent to suggest a listing price. An appraisal is an opinion of value prepared by a licensed appraiser, often required by a lender, following professional standards. Automated online estimates use algorithms and public records, and they cannot see inside the house.
Each has a purpose. A CMA helps you choose a list price; an appraisal tells a lender what the collateral is worth. If an appraisal comes in below the contract price, the parties must work out what follows, and your attorney will guide that discussion. This is general information, not legal, tax, financial or insurance advice. Confirm the details of your own situation with your attorney or another licensed professional.
When the comps run thin
Some homes simply have few good matches. Waterfront properties, large estates, unusual architecture, and houses on oversize lots may have no truly similar sale within a reasonable radius or time frame. In that case, widen carefully and be explicit about what you are stretching. A sale from an adjacent area may be fine if the housing stock is similar; a sale from a very different setting is not.
Sometimes the honest answer is a wider range. Appraisers and agents handle this by weighing more factors and, where they must, by explaining the limits of the data. If someone quotes a precise value for an unusual home without showing their work, ask how they got there.
Seasonality plays a part as well. A winter sale and a spring sale of the same house can differ, and a thin market makes each individual sale count for more. Keep that in mind when a single transaction seems to rewrite the story for the whole street.
Pricing strategy is more than the average
Having a value range is not the same as having a list price. Sellers choose a number in light of timing, competing listings and their own goals. A price just under a common search threshold may reach more buyers. A price set far above the evidence tends to sit, and a home that sits can lose negotiating power.
Buyers use the same tools in the other direction. If you are about to make an offer, build your own short list of comps, note where the seller’s list price falls against them, and ask your agent which features justify a premium or a discount.
Keeping your own file
Buyer or seller, keep a simple record. A spreadsheet with address, sale date, price, size, bedrooms, condition and a line of notes will do. Add photos from the listings when you can. A month later, when you revisit the numbers, you will not have to rebuild the logic from memory, and a gut feeling about “that one on the corner” will have facts attached.
Common mistakes
Cherry-picking is the biggest. It is tempting to quote the highest sale on the street and ignore the rest. Close behind: counting a renovated home as a comp for an unrenovated one with no adjustment, comparing across very different micro-locations, and anchoring on what a neighbor claims they got.
Last, remember that comps describe the past. Interest rates, inventory and season all shape the next sale. Treat the figures as evidence, then talk it through with a licensed agent who knows the local market.
