37 Main Street, Castlerock, Co. Londonderry, BT51 4RA

A detached two-storey interwar house designed by K.F. Lewis and built circa 1940, situated on the north side of Main Street in Castlerock overlooking the Promenade and Irish Sea. The building has an L-shaped plan with a single-storey canted projection to the west and a conservatory to the re-entrant angle; an original adjoining red brick garage and modern single-storey flat-roof extension (of no interest) stand to the east.

The steeply pitched hipped roof is covered in Westmoreland slate with diminishing course slating and angled terracotta ridge tiles, leaded valleys, and swept eaves. Tall red-brick chimneystacks with chamfered stalks and concrete caps rise prominently from the ridgeline. Plastic rainwater goods hang from heavily projecting timber eaves.

The walling is stretcher-bonded red brick with a header-bonded plinth course and a concrete string-course above the ground floor. Windows are replacement timber sash or timber casements with projecting concrete sills throughout.

The principal south elevation is two openings wide at each floor, the right window opening being wider. The ground floor of the canted section features a tripartite timber mullioned window to the centre with 6/6 windows to either side. A recessed entrance to the left sits in a splayed opening with a string-course rising to a shallow arch overhead. A 6/6 window lights the canted bay at the right and one to the left wall. An ashlar sandstone doorcase with carved spandrels and moulded reveal contains an original round-headed hardwood timber door with five vertical panels and cast-iron door furniture, accessed by a set of two curved stone steps.

The west elevation features a projecting bay at the left with a canted bay projection at ground floor, lit by three plate glass windows and rising to a brick parapet with concrete coping that encloses a balcony. The first floor has a canted timber mullioned window and a glazed timber door opening to the balcony. The south elevation of the projection is lit by two 2/4 windows at first floor on either side of a projecting chimneybreast. The north elevation contains a canted timber mullioned oriel window and another window at first floor.

The right bay contains four windows to the first floor (a group of three at the right) above a later red brick and timber conservatory to the re-entrant angle, lit to the south by three round-headed multi-paned timber windows dating to circa 1980.

The north elevation has two windows at first floor and three at ground floor of various sizes. A canted timber mullioned oriel window to the first floor right displays leaded-and-stained glass panels and is supported on a carved sandstone corbel.

The east elevation is abutted at ground floor left by the flat-roof garage. At first floor are a canted timber mullioned window and a tripartite timber window, with a projecting chimneybreast to the first floor left. The garage opens to the south with an original partially glazed timber-sheeted door in a chamfered reveal.

The property sits on a mature raised plot in a residential area. A tarmacadammed driveway approaches from the south with a lawned and landscaped garden to the west; a steep grassy bank lies to the rear. The original red brick boundary walls to the south incorporate mature hedging. The entrance from Main Street is marked by polygonal red brick piers with pointed concrete caps supporting original ornate steel gates. A red brick garden wall with a round-headed arch containing an original steel latch-gate stands at the east side, adjoining the garage.