On screen
Slough House
An administrative dumping ground for MI5 officers whose careers have stalled through mistakes, politics or bad luck.
London location · fiction versus street
Where is Slough House?
Slough House is fictional. Its familiar television frontage is a real building at 126 Aldersgate Street, near Barbican in the City of London.
- Slough House
- Fictional MI5 office
- Front exterior
- 126 Aldersgate Street
- Nearest station
- Barbican
- Public attraction?
- No · exterior view only
Screen geography
One office, several real places
Television editing joins separate exteriors and interiors into one convincing, shabby workplace.
Created from
In London
Aldersgate + St John Street
The front and rear are filmed at different real locations. Interior office spaces are production environments rather than a publicly visitable MI5 workplace.
The front: 126 Aldersgate Street
The recognisable façade stands on Aldersgate Street near Barbican station. Exterior establishing shots make it the public face of the fictional office. The building is real; its Slough House identity is not.
Open the detailed frontage evidence file →
The back: St John Street and Smithfield
The grim rear entrance and service-alley world are filmed separately. Editing, sound and repeated movement between front and back persuade viewers that both sides belong to one building.
Open the rear-alley evidence file →
What about the interiors?
The cluttered desks, stairs, meeting rooms and Jackson Lamb’s office should not be assumed to sit behind the Aldersgate façade. Screen interiors are constructed and selected for production, then joined to the exterior through editing.
Visitor file
How to visit responsibly
This is a working London street, not a studio tour.
Arrive by public transport
Barbican is the nearest Underground station to the frontage. Farringdon provides additional Underground and rail connections for the wider route.
Stay on public pavement
Do not enter the building, tailgate occupants, block doors or treat service areas as sets.
Photograph lightly
Take quick exterior photographs without identifying workers, residents or vehicle details. Move aside during busy periods.
Evidence and access check: reviewed 14 September 2026. Recheck transport and street conditions before travelling. The site is independent and has no access to private interiors.