Fairfield Annexe, former Technical Offices extension to Govan Shipbuilders Ltd. (Fairfield House), 1048 Govan Road, Glasgow

Fairfield Annexe is a nineteen-bay, three-storey Modernist building constructed in 1956–57 as an extension to Fairfield House, the former headquarters of Fairfield Shipbuilding and Engineering Works. Designed by the Glasgow-based architects Frank Burnet and Boston, it was built to provide expanded office and technical facilities for the shipyard's marine engineering operations. The building adjoins the west elevation of Fairfield House, a category A listed building completed in 1891.

The structure employs a concrete frame faced in ashlar red sandstone with a rock-faced base course and continuous sandstone cill courses. A concrete eaves canopy runs across the main elevations, interrupted by a pair of four-storey stair towers that rise above the eaves line. The narrow, rectangular plan is distinctly stripped back in composition and detailing compared to the adjacent Fairfield House, reflecting the International Modern idiom of its date.

The main south elevation features diminutive paired ground floor windows set within raised margins, while the upper floors contain larger openings divided by fluted mullions. The concrete eaves extend down the sides of the stair towers as vertical fins. The entrance door in the western tower has a concrete canopy and marble-tiled surrounds. The west elevation presents a single bay with an asymmetrical gable, and wrap-around windows to the northwest corner.

The rear north elevation, which rises nineteen bays with seven bays projecting at the east end, exposes the reinforced concrete frame infilled with red brick. Ground floor windows here have concrete cills and reeded glass. The eastern tower incorporates a concrete canopy over its entrance door, with a loading beam and upper-floor door arrangement.

The slated roof has an irregular pitch and is surmounted by a stylised metal guard rail along the main elevation. The rear northern pitch is glazed. Windows throughout are two-pane crittall-style metal casements: groups of five-lights on the main elevations and three-lights to the towers.

The interior, inspected in 2017, is characterised by plain, minimal detailing. The ground floor and much of the first floor contain small offices and meeting rooms with largely non-structural partitions, some added later. The upper floor former drawing offices remain open plan. Metal trusses and the glazed northern roof pitch survive but are partially concealed by a later suspended ceiling. Services are surface mounted throughout, with some cast iron radiators retained. A few timber doors from the 1950s–60s remain, some with reeded glass vision panels. A handful of former offices retain veneered wall panelling. Bathrooms preserve 1950s–60s tiling, toilets, urinals and sink units. The stairs feature polished concrete treads with horizontal metal balusters and a timber handrail. A sliding metal door at the first floor east end formerly connected to Fairfield House but the linking corridor has been blocked, likely during restoration works in 2014.

Fairfield Shipbuilding and Engineering Works was established on this site in 1864 as the world's first large-scale integrated shipbuilding and engineering operation. The company began as a small engine shop in the mid-19th century and moved into shipbuilding in 1860 under the direction of John Elder (1824–69), a marine engineer renowned for pioneering compounded marine engines in the mid-1850s. By the 1880s, the firm had achieved global prominence. The construction of Fairfield House in 1891 reflected the company's status as the world's most important and successful shipyard of the era.

Following the Second World War, UK shipbuilding required systematic modernisation to compete with foreign yards. In 1953 Fairfield's initiated a major investment programme costing £4 million, completed in three stages by 1964. The Annexe was constructed as part of this modernisation, driven by the need for expanded accommodation following advancements in marine propulsion systems and growth of the engineering department.

By the mid-1960s Glasgow's shipbuilding industry could no longer sustain competition. The company declared insolvency in 1965 and its marine engine-building subsidiary, Fairfield Rowan Ltd., closed in 1966. The yard remained in state ownership for much of the subsequent 35 years before being sold to BAE Systems in 2000, when it continues to operate. The Annexe and Fairfield House were vacated around 2003 and are now separately owned. Fairfield House underwent restoration as a business centre and heritage exhibition between 2009–2014. The Annexe remains vacant as of 2025. Both buildings form part of the southeast frontage of the still-operational shipyard on Govan Road.