Portballintrae Boat House, Beach Road, Portballintrae, Co. Londonderry

Portballintrae Boat House is a detached single-cell stone boat house built around 1880, located on Beach Road at the eastern entrance to Portballintrae Harbour in County Londonderry. It faces south onto a stone slipway and represents a relatively rare surviving stone maritime structure of its type in the region.

The building is rectangular on plan with a pitched natural slate roof fitted with black clay ridge tiles. A tall red brick chimneystack rises from the east side elevation, and cast-iron rainwater goods are present. The walls are constructed of painted coursed rubblestone with cement pointing and squared stone quoins at the corners. The gabled front elevation contains a segmental-headed opening with a rendered surround, fitted with sheeted double-leaf timber doors on iron hinges. The west side elevation features a single segmental-headed window opening with a red brick surround, iron bars, and a concrete sill. The rear gable is abutted by a rubblestone lean-to structure with a corrugated iron roof and a single sheeted timber door. The east side elevation matches the west side elevation in its fenestration and detailing.

The building has group value with the nearby listed coastguard cottages, which were constructed around 1875 when a new coastguard station was established at this sheltered harbour location. The boat house was erected some years after the station, replacing an earlier coastguard boat house shown on the Ordnance Survey map of 1855. The building is first recorded on the third edition Ordnance Survey map of 1904, though valuation records from 1886 refer to the "site of boat house". It was purchased by James McNeill in 1912 following the Admiralty's sale of the coastguard station and associated buildings, and valued for the first time in 1913 at £1 15 shillings. McNeill sold the boat house and cottages to Margaretta McMullen around 1920. By the 1930s, valuer's notes record that the boat house was being let in summer months as a holiday home comprising a kitchen and two bedrooms. The lean-to privy attached to the north and the chimney with two windows date from this period of holiday accommodation use, though the windows have since been bricked up. The building is believed to have reverted to use as a boat house.

The boat house remains in its original setting beside the harbour, facing onto a rubblestone slipway that is flanked by rubblestone retaining walls. It is an important little-altered maritime structure and retains its authenticity as a rare stone-built example of this building type.