For Immediate Release
Stockbridge Capital Holdings Enters Strategic Steel Design and Supply with Investment in Extraspace Industries
UK private equity firm backs a market-leading designer and supplier of steel storage, secure and specialist buildings — spanning commercial storage through to ballistic-rated and blast-resistant structures in service with NATO, the United Nations, the United States Navy and allied armed forces
Key facts
- Investor
- Stockbridge Capital Holdings, UK private equity firm
- Company
- Extraspace Industries, Surrey, United Kingdom
- Announced
- Sectors entered
- Strategic steel design and supply; defence and security
- Product ranges
- Five, from flat-pack steel storage to blast-resistant buildings
- Certifications
- NIJ Level IV, NATO B7, EN 1063; ISO 9001 (cert. no. 313642019)
- In service with
- NATO, the United Nations, the United States Navy, the British Army and allied armed forces
- Terms
- Not disclosed
East Grinstead, UK, . Stockbridge Capital Holdings, a UK-based private equity firm, today announced an investment in Extraspace Industries, a market-leading designer and supplier of steel storage, secure and ballistic-rated buildings. The transaction marks the Firm’s entry into strategic steel design and supply, and into the defence and security sector.
The investment reinforces Stockbridge’s positioning as a disciplined industrial investor. The Firm targets category leaders in essential, asset-backed sectors with defensible market positions, durable demand and clear operational upside, then scales them through hands-on portfolio operations spanning commercial strategy, digital transformation and buy-and-build expansion.
Two businesses in one
Extraspace Industries is a leading designer and supplier of steel storage containers and specialist buildings, supplying construction, logistics, retail and public-sector customers across five product ranges, supported by a growing e-commerce channel and a national delivery footprint.
Alongside that commercial range, Extraspace designs and supplies the Arma range, including the Armastore and Armakabin, together with ballistic-rated and blast-resistant buildings certified to NIJ Level IV, NATO B7 and EN 1063. These structures are already in service with NATO, the United Nations, the United States Navy, the British Army and allied armed forces worldwide, positioning Extraspace as a specialist supplier of secure and protective infrastructure to government and defence customers. The business is ISO 9001 certified, with every unit built to a documented, audited process.
“Extraspace is two businesses in one,” said Stuart Guy, CEO and Principal at Stockbridge Capital Holdings. “A commercial steel storage designer and supplier with a fast-growing digital channel, and a defence and security specialist whose ballistic and blast-rated structures are trusted by NATO, the UN and allied armed forces. That combination, resilient commercial cash flows underwriting a high-barrier defence franchise, is exactly the kind of asset we are built to own and scale, and it establishes Stockbridge in the defence and security market.”
Stuart Guy, CEO and Principal, Stockbridge Capital Holdings
Strategic rationale
The investment extends Stockbridge’s strategy of acquiring and scaling market leaders in essential, asset-backed sectors with high barriers to entry and significant headroom for operational improvement. Extraspace’s vertically integrated model — designing, engineering and supplying across the full spectrum from flat-pack commercial storage to certified blast-resistant structures — represents the kind of strategic, high-specification manufacturing capability Stockbridge is built to own and grow.
Under Stockbridge ownership, the priorities are scaling Extraspace’s e-commerce and direct-to-trade channel, expanding capacity behind the Arma and ballistic ranges, and broadening access to government and defence procurement frameworks in the UK and allied markets.
Terms of the transaction were not disclosed.
Frequently asked questions
Who has invested in Extraspace Industries?
Stockbridge Capital Holdings, a UK-based private equity firm, announced an investment in Extraspace Industries on 4 August 2026. Terms of the transaction were not disclosed.
What does Extraspace Industries design and supply?
Extraspace Industries designs and supplies steel storage containers and specialist buildings across five product ranges, from flat-pack storage and chemical stores to modular offices, secure and armoured units, ballistic cabins and blast-resistant buildings. Extraspace Industries serves construction, logistics, retail and public-sector customers, supported by an e-commerce channel and a national delivery footprint.
What certifications do Extraspace Industries ballistic and blast-resistant buildings hold?
Extraspace Industries ballistic-rated and blast-resistant buildings are certified to NIJ Level IV, NATO B7 and EN 1063. Extraspace Industries is ISO 9001 certified under certificate number 313642019, with every unit built to a documented, audited process.
Who uses Extraspace Industries ballistic-rated and blast-resistant buildings?
Extraspace Industries ballistic-rated and blast-resistant structures are in service with NATO, the United Nations, the United States Navy, the British Army and allied armed forces worldwide.
What is the Extraspace Arma range?
The Arma range is the defence and security line designed and supplied by Extraspace Industries. It includes the Armastore and the Armakabin, alongside ballistic-rated and blast-resistant buildings certified to NIJ Level IV, NATO B7 and EN 1063.
What is Stockbridge Capital Holdings?
Stockbridge Capital Holdings is a UK-based private equity firm investing in market-leading businesses across downstream energy, industrials, strategic steel design and supply, defence and security, and ultra-luxury hospitality and real estate. Its portfolio includes Extraspace Industries, FuelFixer, The NorthWest Fuel Drain Group, The Gilchrist Collection and Stockbridge Properties.
Where is Extraspace Industries based?
Extraspace Industries is based in Surrey, United Kingdom, and supplies direct to trade and public customers across the UK.
About Stockbridge Capital Holdings
Stockbridge Capital Holdings is a UK-based private equity firm investing in market-leading businesses across downstream energy, industrials, strategic steel design and supply, defence and security, and ultra-luxury hospitality and real estate. Its portfolio includes FuelFixer, the global misfuelling-recovery multinational, The NorthWest Fuel Drain Group, The Gilchrist Collection, and Stockbridge Properties, owner of the historic Homestall Manor and Rockwood Park Estate. The Firm combines patient capital with hands-on portfolio operations, spanning commercial strategy, digital transformation and operational value creation, to build category champions. For more information, visit stockbridgecapitalholdings.com.
About Extraspace Industries
Extraspace Industries is the UK’s trusted designer and supplier of steel storage, secure and specialist buildings, from flat-pack storage and chemical stores to modular offices, secure and armoured units, ballistic cabins and blast-resistant buildings. Its defence-grade Arma and ballistic ranges are certified to NIJ Level IV, NATO B7 and EN 1063 and in service with NATO, the United Nations, the United States Navy and allied armed forces. ISO 9001 certified (cert. no. 313642019). Supplied direct to trade and public from its Surrey base. For more information, visit extraspacestore.co.uk.
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