518 New Castle Ave
Portsmouth, NH 03801
residentialSingle Family
Building & Site Intelligence
Complete building characteristics, construction details, and site data from municipal assessor records and supplementary sources.
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Property Intelligence: 518 New Castle Ave, Portsmouth, NH 03801
Property Overview
518 New Castle Ave is a Contemporary, Single Family, built in 2001, 14,787 square feet, 7.70 acres in Rockingham County, NH. 5 bedrooms, — bathrooms. Ownership type: Trust. Assessed value: $14,154,800.
Condition & Permits
NEP Condition Estimate: C3. This property-specific condition rating is derived from municipal building permit records, not imagery or automated valuation models. 1 building permits on file from municipal records.
Risk & Hazard Profile
NEP Fire Protection Grade: D. FEMA flood zone: X. Sea level rise: at risk at 1-foot rise scenario. Risk assessment combines NEP proprietary ratings with federal, state, and municipal hazard data at parcel-level precision.
Ownership & Deed History
1 deed and lien records on file. Full ownership chain, entity resolution, lien analysis, and comparable sales available with subscription.
About This Data
NE Provenance assembles property intelligence from municipal assessor records, building permit databases, county deed registries, federal environmental and hazard datasets, business registration filings, and state-level geospatial data — 140+ authoritative, primary sources corroborated at the individual address level.
Property data for Portsmouth, NH and all six New England states. NE Provenance covers Rockingham County and over 4.7 million properties across 29 counties with up to 430 intelligence attributes per property record.
