The road easement was recorded wrong and now the lot I sold last year clouds the title on the three I still hold

The lot one buyer's $18,000 ask is probably the floor, not a negotiating open.

The assumption doing the most work in your original model was that the county accepting the plat was equivalent to the easement being legally clean. Those are different tests. County acceptance confirms the plat meets filing requirements. It does not confirm that the legal description of the easement correctly corresponds to the physical improvement on the ground. The surveyor's insurer is leaning on exactly that distinction, and it is a defensible read.

On sequencing for future projects: the point in the cycle where easement language needs pressure-testing is before the plat is recorded, not before the first deed. Once the plat files, the legal descriptions are locked into every subsequent instrument. What that means practically is that you want a licensed surveyor, separate from the one who prepared the plat, to perform a field verification that the bearings in the easement description actually correspond to the physical road as built. That second check is the one that catches bearing errors before they get into chain of title. It costs a few hundred dollars and eliminates the scenario you are now in.

The structural risk you did not name in your post is that staging a lot sale to fund carry is a capital structure decision, and it places a third party into chain of title before you have tested every instrument that the remaining lots depend on. The first buyer is not a partner in the project, has no obligation to cooperate, and has real negotiating power once they understand the situation. That $18,000 demand is not irrational from their position.

On the E&O claim, you need a coverage attorney to review the policy language, because whether county acceptance of the plat constitutes a bar to the claim turns on how the policy defines a covered error. That is not a general question; it is a policy reading question. Get that opinion before the insurer gets further into their denial position.

Eight months of negotiation at $1,100 a month is already $8,800. What is your current ceiling for the corrective deed payment before the net per lot on the three remaining lots falls below your floor, and have you modeled what the lots net if you concede the $18,000 today versus two more months from now?

The sequence question has a clean answer: easement language gets reviewed by a real property attorney, confirmed against the physical survey, and signed off by title before the first lot goes under contract, not at closing. The error here was treating county plat acceptance as a proxy for legal sufficiency, and those two things measure different things entirely.

What nobody has named yet is that the lot one buyer's $18,000 ask is actually a negotiating position shaped by their own title exposure. If they ever try to sell, finance, or encumber lot one, their deed carries the same misdescribed easement, which means their own title is clouded too. That shared defect is real pressure in a negotiation that so far seems to be running as if the leverage is entirely on their side.

Does the lot one buyer have any financing on their parcel, because a lender holding a mortgage on a lot with a title defect has standing and motivation that can change the dynamic here?

The county accepting a plat does not validate the legal description of an easement against physical conditions on the ground, and that distinction is exactly what the E&O fight turns on, so the surveyor's insurer is running a weaker argument than they may appear to be.

On sequencing: the first deed that records on any multi-lot split should never be the lot whose chain of title will control access for the remaining inventory. If you need early capital from a lot sale, the correct lot to sell first is one that takes access from a separately recorded instrument or a public road, so that buyer lands in chain of title without holding any veto. When no such lot exists and the access easement is shared, the instrument has to be recorded and title-insured as a standalone step before any lot deed closes, which means running a title commitment on the easement itself, not just on the lot, and confirming the bearing and distance against field survey monuments before the plat goes to the county. That confirmation step costs almost nothing relative to where you are now.

What is the lot one buyer's actual basis for the $18,000 figure, and have you had a real property attorney assess whether a court-ordered reformation of the easement description is viable if the buyer stays at that number?