Similarity beats proximity
The closest sale is not automatically the best comp. Match the buyer's choice set: property type, effective size, bed and bath utility, lot, condition, school context and micro-location. A comp across a road or inside a different buyer pocket can be less useful than one farther away with the same finished product.
Use a comp ladder
Build a ladder instead of cherry-picking a hero sale.
- Anchor: the closest truly comparable renovated sale.
- Support: two to four sales that bracket size, finish and timing.
- Ceiling: the best result a buyer could reasonably defend.
- Floor: a sale that keeps the downside visible.
Adjust for the product you will actually deliver
ARV is not a reward for spending more. It reflects what the market will pay for a coherent finished product. A durable rental-grade kitchen does not create luxury resale value, and a luxury finish in a modest block may not return its cost. Walk the neighborhood and write the finish brief before you adjust the comps.
Document the range
Publish a low, central and high ARV with the comp set and adjustment notes attached. Then test the deal at the low number. If the acquisition only works at the ceiling, the risk is not hidden in the model anymore; it is sitting plainly in the decision.
Control the time axis
A comparable from two years ago may describe a different financing and buyer environment. Prefer recent sales, but do not force recency over similarity. Note the sale date, contract-to-close timing if known and any market shift you are applying. A simple dated comp log is more defensible than a vague statement that the market is moving.
Walk the buyer's route
Visit the subject and comps as if you were the eventual buyer. Start at the street, notice neighboring conditions, then move through the entry, kitchen, primary suite, storage, parking and outdoor space. Ask what would make a buyer choose one house over another at the same price. This exercise catches location penalties and functional differences that a spreadsheet cannot see.
- Street and block appeal.
- Layout and natural light.
- Systems, parking and storage.
- Finish coherence across the whole product.
After the walk
Write a one-page ARV brief: selected comps, excluded comps, adjustments, finish scope, target buyer, low/base/high values and the evidence that would change each value. Give it to the contractor and lender. If they cannot understand the finished product from the brief, the valuation is not ready to drive an offer.