NYC's Trusted Land Surveyor Expert Witness for Insurance Defense
When a claim comes down to inches, angles, or a disputed property line, Expertmapco delivers the rapid, court-ready surveying evidence that insurance defense teams, carriers, and counsel can build a case on across all five boroughs and New York State.
Response time
48hrs
On-site mobilization to preserve evidence before conditions change
5
NYC Boroughs served
PLS
Licensed New York Land Surveyor
The Facts on the Ground
When liability comes down to precise measurement, not opinion.
A sidewalk height differential. A property line no two surveys agree on. An easement nobody remembers signing. These are the details that decide NYC premises liability and property casualty cases, and they don’t hold up in court on opinion alone. They hold up on measurement, documentation, and code compliance that can survive cross-examination.
Frank S. Ferrantello, PLS brings decades of licensed New York surveying expertise to insurance defense teams, carriers, and counsel who need one thing fast: objective, litigation-ready evidence. From §7-210 sidewalk defect claims in Manhattan to boundary disputes in Brooklyn and accident site mapping in Queens, Expertmapco turns complex site conditions into clear, defensible exhibits the kind adjusters, mediators, judges, and juries can actually understand.
Expert Witness Services
Built for NYC Insurance Defense
Six focused practice areas. Every engagement backed by field measurement, code-compliance analysis, and deposition-ready deliverables.
Premises Liability & §7-210 Sidewalk Defense
Rapid mobilization, scaled photography, and slope analysis to determine whether a condition was de minimis, properly maintained, or unrelated to the alleged incident, and to prove it under NYC Administrative Code §7-210.
Boundary Disputes & Easement Analysis
Historical deed and title research paired with forensic field retracement to resolve conflicting boundary claims and easement rights before they escalate into costly litigation.
Property Casualty & Subrogation Support
Historical surveys, maps, and title records analyzed to establish ownership and responsibility, giving carriers the objective foundation to pursue or defend subrogation with confidence.
Accident Site Mapping
Topographic mapping, sight-distance analysis, and road geometry documentation that integrates directly with accident reconstruction to support liability allocation in vehicular claims.
Condemnation & Ownership Rights
Boundary and title analysis for eminent domain and condemnation matters clarifying ownership where property, easement, and insurance issues intersect.
Expert Testimony & Litigation Exhibits
Deposition-ready reports and color court exhibits that translate technical survey data into evidence that's persuasive at the negotiation table and unshakable at trial.
Our Process
From First Call to Court-Ready Exhibit
You call, we move. On-site within 48 hours to capture conditions before they change, because delayed documentation is the single biggest risk to a defensible case.
Scaled photography, slope and boundary analysis, and, where relevant, historical deed, title, and survey research, all conducted to a standard that holds up under cross-examination.
Findings are checked against the relevant NYC and NY State standards, including §7-210, so the analysis speaks directly to the legal question at hand.
A clear, deposition-ready report paired with color court exhibits built for adjusters, mediators, judges, and juries, not just other surveyors.
Available for deposition and trial testimony, ready to explain findings in plain language and defend them under questioning.
Proven Results
Case studies across NYC.
Where Precision Met the Courtroom
Case Studies: Where Precision Met the Courtroom Anonymized, real-world engagements across NYC and New York State. Behind every favorable settlement or successful defense is a moment where objective evidence made
What 24+ Years in the Field Teaches You
The Facts on the Ground Practical knowledge for defense counsel, carriers, and property owners. Some of the most costly mistakes in insurance defense and property casualty claims come from misunderstanding
Vehicular Accident Site Mapping
What Clients Say
Trusted by carriers, counsel, and claims teams.
Get Expert Support
Ready for your next NYC matter?
Whether you’re evaluating a sidewalk claim, untangling a boundary dispute, or need a qualified expert witness for trial, Expertmapco is ready to mobilize- fast, objective, and court-ready from day one.