Building an evidence packet a board can actually use
One page of argument, one table, and the records behind it. In that order.
Boards read quickly and hear many cases. Structure earns attention.
Page 1 — the argument
Property, PIN, current assessment, requested assessment, and the ground in one sentence: "This parcel is assessed $X. Four parcels of the same class and town, within 8% on lot and building size, are assessed a median of $Y. I request $Y." Nothing else.
Page 2 — the comparison table
One row per comparable: PIN, address, class, lot size, building size, year built, assessed value, assessed per square foot. Your own property in the same table, marked. The reader should be able to see the claim without reading a sentence.
Pages 3+ — the records
A printout from the county portal for each comparable. This is what turns your table from an assertion into something verifiable.
Then any factual evidence
Photographs, survey, plans, appraisal — only if they support the specific ground you named.
What to leave out
Your tax bill history. Automated estimates. Anything about the rate. Anything about your circumstances. None of it is within the board's power to act on, and it dilutes what is.