SMBL, a company partnered with the British Library and wholly owned by Mitsui Fudosan UK Ltd., has selected Mace as construction manager on the £1.1 billion new development of the Library’s St Pancras site.

The selection of Mace marks the latest milestone in the project’s timeline, following the announcement in March 2025 confirming Mitsui Fudosan’s commitment to the development.

Mace is an international consultancy and construction company and has played a key role in delivering major projects such as The Shard, London 2012 Olympics infrastructure and Heathrow Terminal 5.

Mace will join the project under the direction of development manager Stanhope Plc and will contribute construction expertise for the procurement and delivery phase of the development.

The proposals include a 100,000 sq ft (9,290 sq m) extension to the British Library comprising new spaces to enhance the Library’s public service offer, provide more than 600,000 sq ft (55,742 sq m) of commercial facilities and integrate Crossrail 2 infrastructure.  The project includes exhibition galleries, events spaces and learning facilities.  Located at the heart of London’s Knowledge Quarter, the development will incorporate circulation areas to connect it with the existing Library building and provide easy access from all directions through the enhanced facility.  It will also include provision to extend the Library’s business offer, with maker spaces to create and pilot products.  The Library is launching a major fundraising campaign to bring these areas to life.

Construction is due to start on site in 2026 once detailed design is complete and planning conditions met.  The construction work is expected to take around six years to complete.

For further information please contact Redwood: 

Paul Stelmaszczyk on +44 (0)7808 870704 / stel@redwoodcomms.co.uk

Debbie Cracknell on +44 (0)7860 658288 / debbie@redwoodcomms.co.uk