Heritage Category:
Listed Building
List Entry Number:
Date first listed:
Statutory Address:


Ordnance survey map of WAR ROOM BUNKER
© Crown Copyright and database right 2019. All rights reserved. Ordnance Survey Licence number 100024900.
© British Crown and SeaZone Solutions Limited 2019. All rights reserved. Licence number 102006.006.
Use of this data is subject to Terms and Conditions.

The above map is for quick reference purposes only and may not be to scale. For a copy of the full scale map, please see the attached PDF - 1272463 .pdf

The PDF will be generated from our live systems and may take a few minutes to download depending on how busy our servers are. We apologise for this delay.

This copy shows the entry on 22-Oct-2019 at 15:12:01.


Statutory Address:

The building or site itself may lie within the boundary of more than one authority.

Greater London Authority
Barnet (London Borough)
Non Civil Parish
National Grid Reference:
TQ 24196 92306


31/0/10411 02-DEC-02

PARTINGDALE LANE Mill Hill War Room Bunker


War Room. Early 1950s. Reinforced concrete construction. Two storey surface structure, with a central map room surrounded by control cabins, offices and plant room. Plain elevational treatment, with projecting parapet to flat roof and steel doors to entrance. Three protruding ventilation/exhaust structures on the roof of the bunker, arranged in line along the eastern edge of the roof, above the plant rooms. These are all box-like structures, perhaps 1.5m x 1m in plan and 1.5m tall, concrete or render, with black louvres in several faces.

INTERIOR: The central planning room is surrounded by wooden framed windows connecting to the suite of surrounding rooms. These windows have fabric mesh instead of glass, and in each case one opening frame (to allow passage of documents etc). All the surrounding rooms leading off the main corridor retain their original wooden doors, painted red (like the main entrance/blast doors) with white room numbers at eye level. The two entrances each have twin doors, a wooden (metal sheet reinforced) outer door with fairly normal locks and a substantial inner blast door set along each passage, fastened from within by two locking levels.

Most of the rooms retain original light fittings (single bulb fitments, covered by inverted glass domed cylinders) attached to original metal tube conduits for the wiring, metal light switch boxes etc. Most rooms also retain features such as metal coat hooks on wooden battens, and the original box-ducting for the ventilation system.

There are two lavatory/shower rooms, one male and one female. These are complete with shower stalls, hand basins, toilet cubicles and pedestals, and hot water tanks (twin sets of emersion heated tanks - each the size of a domestic hot water tank). Fresh water tanks (each made in rivetted painted metal steel, about 1.5m square) occupy the small rooms adjacent to each shower room,and there is one further water tank room on the southern corridor.

The oil fired engine for the electrical plant is completely intact (1953 on the manufacturers plate), together with the electrical plant itself (AC transformer, junction boxes, regulators, etc) mostly in the room alongside the power plant. In the adjacent room, the fan system for the internal ventilation appears substantially intact, together baffle/filter chamber and the main duct leading into the rest of the system (with summer/winter flow controls).

HISTORY: This is an exceptionally well-preserved example of a 1950s War Room, a specialised type of building designed to protect its occupants from the effects of nuclear attack and which relates to a major defining characteristic of the Cold War period of 1945-89. During much of the 20th century the possibility of the breakdown of central government control was a constant concern, prompted first by revolutions on the continent, later by industrial strikes at home and finally the spectre of total war through air attack. To counter these threats, the country was divided from the 1920s into 12 Home Defence Regions, each to be controlled by a Regional Commissioner in case of emergency. Initially these regions were to be run from existing government offices, or improvised shelters in basements. However, in the early 1950s, each of the Regional Commissioners was provided with a War Room, in an attempt to protect them and their staff (of around 50), from an attack on the country with atomic bombs. Of the 12 bunkers built, the examples at Brislington in Bristol and Mill Hill are the best preserved, the Mill Hill example being the sole survivor of four which originally served London. The surviving components include steel exterior doors, a ventilation system complete with plant and exterior flues and baffles and generator plant.

These War Rooms - bunkers designed to counter the effects of nuclear weapons - represented a new type of architecture in Britain. Their form, with a central operations room surrounded by control cabins, supported by communications rooms, air conditioning plant and emergency generators, was designed for this one purpose. They provide a direct visual relationship to the fear of nuclear annihilation of civilian populations that characterised much of the Cold War period. They are also significant in a national context for their linkage to the built infrastructure - ranging from USAAF bases, Rotor radar bunkers and missile bases - established during the first phase of the Cold War, resulting from the detonation of the Soviet atom bomb in 1949, the Korean War and the worsening situation in eastern Europe.


The contents of this record have been generated from a legacy data system.

Legacy System number:
Legacy System:


This building is listed under the Planning (Listed Buildings and Conservation Areas) Act 1990 as amended for its special architectural or historic interest.

End of official listing

Your Contributions

Do you know more about this entry?

The following information has been contributed by users volunteering for our Enriching The List project. For small corrections to the List Entry please see our Minor Amendments procedure.

The information and images below are the opinion of the contributor, are not part of the official entry and do not represent the official position of Historic England. We have not checked that the contributions below are factually accurate. Please see our terms and conditions. If you wish to report an issue with a contribution or have a question please email [email protected].