'Thames House' is an office development in
Millbank,
London on the bank of the
River Thames adjacent to
Lambeth Bridge. It has served as the headquarters of the
British Security Service, commonly known as
MI5, since December
1994.

MI5 headquarters at Thames House, seen from the Lambeth side of the River Thames.
The building was constructed in
1929-
30 by
John Mowlem & Co on riverside land cleared after the disastrous
1928 Thames flood severely damaged run-down residential properties. It was built to designs by Sir
Frank Baines, of the Government's
Office of Works. It is a uniform but not identical design to Nobel House which is opposite it on the north side of Horseferry Road; while Nobel House was exclusively for
Imperial Chemical Industries, Thames House originally had various uses. Baines' design owes much to the 'Imperial Neoclassical' tradition of
Sir Edwin Lutyens and deliberately ties in with the Imperial design of Lambeth Bridge when it was redesigned from
1929. High up on the frontage are statues of St.George and Britannia sculpted by
Charles Sargeant Jagger.

The archway, showing the GMW infill extension built for MI5.
As MI5 headquarters
The dispersed and dilapidated state of its previous buildings in
Curzon Street House (since demolished) and 140 Gower Street (also demolished) led MI5 to seek a new home in the late 1980s. The
Secret Intelligence Service (MI6) were engaged in a simultaneous hunt for new headquarters and consideration was given to co-location of the two. However this proposal was abandoned, due to the lack of buildings of adequate size (existing or proposed) and the security considerations of providing a single target for attacks. At the same time, Thames House, which was largely used as government offices, became vacant and it was decided to convert and refit it for MI5's use. The GMW Partnership undertook the design and
Mowlem carried out the necessary reconstruction work from
1990, which included part-infilling of the building's distinctive archway.
Thames House now stands almost directly across the
River Thames from the
headquarters of its sister organisation
MI6 at 85
Vauxhall Cross. The building is shared with the
Northern Ireland Office.
The
BBC television series ''
Spooks'' uses the exterior and lobby of the
Freemasons' Hall in
Great Queen Street as a location for the show's portrayal of Thames House.
See also
★
SIS Building – Headquarters of
MI6
External links
★
National Audit Office report on the building conversion (PDF)