NE Provenance

518 New Castle Ave

Portsmouth, NH 03801

residentialSingle Family
Owner
Wal...
Owner Type
Trust
Assessed
$14,154,800
Built
2001
Sq Ft
14,787
Lot
7.70 ac
Bed/Bath
5/—
Type
Single Family
Elevated Risks22ConditionC3Fire GradeDPermits1Last PermitOct 2025FloodX

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518 New Castle Ave, Portsmouth, NH 03801— Property Report

Home& Property Details

518 New Castle Ave is a Contemporary single family built in 2001 located in Portsmouth, Rockingham County, NH. The home has 14,787 square feet of living area on a 7.70-acre lot. The home has 5 bedrooms.

Flood Zone & Natural Hazard Assessment

518 New Castle Ave is in FEMA flood zone X. Zone X is outside the Special Flood Hazard Area, meaning the property has minimal flood risk according to FEMA mapping. This property is at risk of inundation under a 1-foot sea level rise scenario. The FEMA National Risk Index composite rating for this area is Very Low. The ASCE 7-22 design wind speed for this location is 112 mph. The ground snow load is 50 psf. The EPA radon zone is 1 (highest potential).

Fire Protection

NE Provenance rates the fire protection for 518 New Castle Ave at Grade D (Limited fire protection access). The nearest fire station, Portsmouth - Police Station, is 0.7 miles away. This grade reflects fire station proximity, department capabilities, hydrant coverage, and municipal water infrastructure. Properties with Grade D or E may face higher insurance premiums due to limited fire protection resources.

Building Permits & Property History

Municipal records show 1 building permit on file for 518 New Castle Ave. The most recent permit was filed October 29, 2025. In the past five years, 1 permit has been issued. The current municipal assessment is $14,154,800, with $8,828,000 attributed to land and $5,326,800 to improvements. The deed history includes 1 recorded conveyance.

Environmental & Land Use

518 New Castle Ave is classified as a waterfront property. Dam exposure is rated Low.

PortsmouthNeighborhood & Community

518 New Castle Ave is located in Portsmouth, Rockingham County, NH. The property is zoned SRA (Single Residence A). The median home value in this census tract is $798,900. Median household income is $160,740. The owner-occupancy rate in the surrounding area is 77%. The property is served by the Portsmouth school district.

Full Property Intelligence Report

The complete NE Provenance report for 518 New Castle Ave, Portsmouth, NH includes over 430 data attributes sourced from 140+ public and proprietary datasets. The full report covers building construction and materials, NEP Condition Estimate derived from permit history, system ages for roof, electrical, plumbing, and HVAC, complete ownership and deed chain with transaction classification, FEMA flood and coastal hazard analysis, environmental contamination screening, and neighborhood demographics. Available as a professional property wallet, PDF report, or structured data export.