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


© Crown Copyright and database right 2021. All rights reserved. Ordnance Survey Licence number 100024900.
© British Crown and SeaZone Solutions Limited 2021. 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 - 1251161.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 18-Apr-2021 at 06:33:25.


Statutory Address:

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

Epping Forest (District Authority)
Waltham Abbey
National Grid Reference:
TL 37743 01289


ROYAL GUNPOWDER FACTORY TL3700 3/10020 MOD Building L149 (Group E Incorporating Mills) GV II* Building in two main phases, the core built c1869 as "Pellet Powder Buildings" comprising an Accumulator House, Engine House and Boiler House; converted into incorporating mills in 1877-8. English bond yellow brick with red brick dressings; slate roofs. T-shaped plan: originally a roughly square plan. In 1877-8 the coal yard walls were demolished, the rest of the structure; a new Boiler House was built at the rear of the Engine House and a new coal yard was formed which incorporated the earlier chimney; 3-bay cross wings for incorporating mills added to north and south; Pump House added between 1878 and 1895, extended c1904, on north side of Boiler House. One storey, with taller Engine House to centre having brick dentil cornice and pilasters. Accumulator House has datestone 1887-8, probably recording a rebuilding, semi-circular arched doorway, paired semi-circular arched windows to each elevation with false machicolation pattern of bricks above and to corbelled-out cornice. 1877-8 Boiler House of 4xl bays, the bays articulated by pilasters and the 3 eastern bays on the north and south elevations each containing a pair of semi-circular arched windows with red brick heads and drops, in a style similar to that of the Accumulator House; rubbed red brick semi-circular arch to eastern end. Cross wings each of3 bays, the original insubstantial walling having been replaced. Pump House, added to centre of north elevation of the Boiler House, has semi-circular headed windows to north elevation and square windows to east and west sides. Interior: Boiler House has trusses with wrought-iron tension rods, decorative cast-iron compression members and cast-iron ventilators. Cast-iron columns on the outer west side of the cross wings originally formed part of an open verandah which had ends of corrugated iron. Composite timber and iron roofs to cross wings, the relatively insubstantial fabric being easily replaced should an explosion occur; a drenching apparatus, erected over each pair of runners, would also have been activated. The original gearing for the incorporating mills survives in a chamber below ground level, the manufacturing process being identical to that carried out in L157 (qv), upon which the later incorporating mills were modelled. The accumulator provided hydraulic power to press gunpowder in pellet forms, which resulted in more consistent performance and was particularly important component of the technology of the large-bore guns being developed in this period. (RCHME report, 1993).

Listing NGR: TL3774301289


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

Legacy System number:
Legacy System:


Books and journals
The Royal Gunpowder Factory Waltham Abbey A Survey, (1994)


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

Images of England

Images of England was a photographic record of every listed building in England, created as a snap shot of listed buildings at the turn of the millennium. These photographs of the exterior of listed buildings were taken by volunteers between 1999 and 2008. The project was supported by the Heritage Lottery Fund.

Date: 28 Aug 2001
Reference: IOE01/03632/09
Rights: Copyright IoE Mr Alan Simpson. Source Historic England Archive
Archive image, may not represent current condition of site.
To view this image please use Firefox, Chrome, Safari, or Edge.

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].