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Mace, Rooff and Barnes among contractors behind Stirling Prize projects

Stirling Prize 2026 - contractors that built the shortlisted schemes for this year’s Royal Institute of British Architects Stirling Prize.
The six projects shortlisted for the RIBA Stirling Prize 2026 (clockwise from top left): Pembroke Mill Lane (© Fred Howarth); Fairmead High Beach (© Johann Dehlin); Paddington Square (© Hufton Crow Photography); BEAM; Lion Green Road (© Lorenzo Zandri); River Wing (© Philip Vile)

Mace and smaller contractors Rooff and Barnes Construction are among the contractors that built the shortlisted schemes for this year’s Royal Institute of British Architects (RIBA) Stirling Prize.

The projects in the running for the UK’s highest accolade in architecture include two schemes for separate colleges at Cambridge University, a new piazza and mixed-use scheme next to Paddington train station, and an arts centre in Hertfordshire.

The full shortlist is:

River Wing, Clare College, Cambridge by Witherford Watson Mann Architects

Client: Clare College, Cambridge
Contractor: Barnes Construction

Pembroke Mill Lane by Haworth Tompkins

Client: Pembroke College, Cambridge
Contractor: Cocksedge Building Contractors
Project manager: Bidwells

Paddington Square by Renzo Piano Building Workshop in collaboration with Adamson Associates

Client: SELLAR
Contractor: Mace

Lion Green Road housing, Croydon by Mary Duggan Architects (design) with RUFF Architects (delivery)

Client: Brick by Brick
Contractor: CField

BEAM arts centre, Hertford by Bennetts Associates

Client: East Hertfordshire District Council
Contractor: GPF Lewis

A house at Fairmead, High Beach, Epping Forest by Sergison Bates architects

Contractor: Rooff
Structural engineer: Price and Myers

The winner of the award will be announced on 15 October. Last year’s prize was won by Witherford Watson Mann Architects for its Appleby Blue Almshouse residential scheme in Bermondsey, London.

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