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Soho Foundry

Boulton & Watt · 1795

The foundry opened by Boulton & Watt in 1795 near Birmingham, which made their firm a complete manufacturer of steam engines.

This foundry, commissioned by Watt and Boulton, let their firm manufacture complete steam engines itself.

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Front view of a brick industrial building with a stone-columned portico entrance. The arch reads 'SOHO FOUNDRY' and a sign says 'AVERY'. A large sign on the right facade reads 'Avery Weigh-Tronix'. A street with a lamp post is in the foreground.
Soho Foundry, Smethwick, built 1794-5 for Matthew Boulton and James Watt.

About this source

What it is

Soho Foundry in Smethwick was built in 1794-5 for Matthew Boulton and James Watt. It allowed their firm to manufacture complete steam engines on site rather than relying on outside suppliers for parts.

Why it matters

The foundry marks the maturing of Boulton & Watt's business from a partnership supplying engine designs into a full manufacturing operation, reflecting the growing scale and organisation of industry in Watt's later career. The building was later altered and used by other companies, showing how industrial sites change use over time.

Look closer

  • What does the current signage on the building tell us about its later history?
  • Why might Boulton and Watt have decided to build their own foundry instead of buying parts elsewhere?
  • What does the modern facade hide about the original 18th-century workshops behind it?

This artifact is part of the curated material that grounds the AI version of James Watt on Humy.ai — when students ask about related events, the AI can quote it and cite it.

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Printed first page of Watt's Specification, patent No. 913 dated A.D. 1769, headed Steam Engines, &c., with a royal coat of arms above. The text begins 'To all to whom these presents shall come, I, James Watt, of Glasgow, in Scotland, Merchant, send greeting.'Document

Primary source

James Watt Patent No. 913

James Watt · 1769 (reprinted 1855)

Dark metal cylindrical object standing upright on a wood-grain surface, viewed from above. It has a short pipe projecting from its left side, and a hand-painted marking reading roughly '1744-786' runs down its front.Artifact

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Watt's First Condenser

James Watt · c. 1765

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Model Newcomen Engine Repaired by James Watt

Unknown maker (repaired by James Watt) · c. 1760

Interior of a cluttered 18th-century style workshop with a wooden workbench, a large iron lathe-like machine, shelves of white ceramic jars and stoneware, plaster busts and casts, and hanging chains and a beam overhead. A window is at the left.Artifact

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James Watt's Workshop

Interior of a museum showing the Smethwick Engine: a large dark cylinder with a steam pipe and valve rises beside a steel walkway. Above, wooden beams and a large iron beam structure stand. In the background, a red-spoked flywheel engine sits on a green base.Artifact

Primary source

Smethwick Engine

James Watt · 1779

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