Ranked 90 addresses by roof plane, and the tier one letters did all the work
I read houses for a living from the framing side, so I tried using that on a driving list instead of mailing everything at once.
90 addresses logged over six weeks in an older tract, mostly hip roof ranches from the sixties. Sorted them into three tiers from the curb only:
Tier one, 28 addresses. Roof plane visibly out of line, a sag between rafters, or a rooftop patch that had been patched again. Plus anything with a bulge or a stair step crack in the visible foundation line, or a porch column that had moved off its bearing. These are houses where the repair number is big enough that an owner without cash has probably already gotten a quote and gone quiet.
Tier two, 39 addresses. Deferred maintenance that hasn't turned structural. Cupped siding, gutters gone, a section of fence down.
Tier three, 23 addresses. Just untidy.
Mailed tier one only. Two touches, 28 addresses, cost me under $50. 5 calls, 2 kitchen conversations, 1 contract at $141,000 on a house I scoped from the curb at $38,000 of work.
Actual repairs came in at $46,000 once we opened the rear wall, because the sag I saw was a rafter that had been sistered badly and the top plate under it was gone. I bought this one to hold, so the $8,000 came out of my pocket rather than a buyer's, which is the part I'd change. My curb number was 17 percent light on a house where I could see the problem from the street. Now I run the curb estimate and add 20 percent before I put a price on paper.
What I'd keep: mailing 28 instead of 90. The tier three letters would have cost me forty dollars and taught me nothing.