Market Insight
What a Home Valuation Actually Measures (and What It Misses)
By Justin Longenbach · · 6 min read
Almost every homeowner has looked up their address on a portal and seen a number. Those automated valuation models are useful for a rough order of magnitude and are genuinely poor at the last ten to fifteen percent — which, on an intown Atlanta home, is the part of the number that matters.
What an automated estimate is built from
It draws on tax records, prior sale prices, square footage, bed and bath counts, and nearby sales, then fits those into a model. Everything it knows about your house is what a database says about your house.
What it cannot see
The variables that separate two identical-on-paper houses in the same zip code are almost all invisible to a model.
- Condition and finish level — a renovated kitchen and a 1978 kitchen record identically
- Lot quality: flat and usable versus steep, wooded and unusable
- What the house backs up to — a park reads the same as an arterial road
- Floorplan functionality, natural light, ceiling height
- Unpermitted additions that inflate recorded square footage
- Systems age: roof, HVAC, sewer line, electrical service
- Micro-location: in intown Atlanta, value changes street by street
How a comparative market analysis is built
A CMA starts with closed sales, not listings, in a tight radius — often a few streets rather than a few miles — filtered to a similar era, size and style, and generally within the last three to six months.
Each comparable is then adjusted: up or down for square footage differences, an extra bath, a finished basement, a garage, renovation level, and lot. Pending sales indicate current direction. Expired and withdrawn listings mark where the market has already refused to go.
The output is a defensible range with a recommended list price and a stated strategy — priced to launch strong, priced to invite competition, or priced for a specific timeline — rather than a single number with no reasoning attached.
When to get a real valuation
Before listing, obviously. But also before a refinance, before making a large renovation decision, when settling an estate, when rebalancing net worth, or simply once a year if your home is your largest asset and you would like to know where you stand.
There is no obligation attached to the exercise, and knowing a real number beats guessing at one.