Buildings Nos 31, 35 and 37 (Seaplane Sheds) and Winch Houses, former HMS Daedalus

The site comprises three paired seaplane storage hangars, buildings 31, 35, and 37, dating from around 1917-18, and two winch houses, formerly part of HMS Daedalus. Buildings 31 and 35 are positioned on either side of the former slipway, with winch houses associated with the raising and lowering of planes. Building 37 is located at a right angle to the others and represents the southeasternmost part of the group.

The hangars are constructed with a steel framework and roof trusses. The original asbestos-cement cladding and roofing have been replaced with corrugated steel, which is not considered of special interest. The steelwork was fabricated by Frodingham Iron and Steel Co. Ltd.

Each hangar pair is designed as an end-opening structure, with a span of 14.6 meters (48 feet) across five bays, each measuring 3.6 meters (12 feet). At the inner end of each pair, facing a large concrete apron, are twin gables situated above full-height pairs of sliding doors, allowing for maximum half-width openings. Two pairs are arranged along the southwest perimeter of the site, adjacent to Marine Parade, originally separated by twin slipways, but now featuring a single slipway leading to the water's edge. The third pair is positioned at a right angle to the others, at the south end of the apron.

The exterior of each hangar couple features twin gables above the paired sliding doors, facing the apron. Original design included a series of five multi-pane steel casements along the long flanks, with similar casements to the outer gables. Most of these have been lost due to re-cladding; however, Building 35 retains two steel-framed windows on its southeast elevation and one on its southwest elevation. Two other windows on the southwest elevation are later wooden-framed additions, and two are boarded up, suggesting they were originally wooden-framed. To the southeast of building 31 is a restored winch house, built of brick with a formerly slate roof, now covered with corrugated sheet. It has a pair of timber double doors under a heavy concrete lintel in the end gable facing the slipway, and a casement window with a similar lintel in the northeast elevation, alongside a fixed window in the southwest elevation. A further brick winch house is located to the north of building 35, but has been altered with a flat roof and a narrowed gable-end door.

Inside the hangars, original steel trusses, frame cross-bracing and portal framing remain, along with original rails for the sliding doors. Modern additions are not considered to be of special interest.