Six wins at the 2026 RIBA National Awards
The RIBA Stirling Prize celebrates the very best of British architecture.
Working alongside talented and committed clients, architects and wider design teams, we helped shape four of the projects shortlisted for the 2026 prize. From ambitious new buildings to transformative retrofits, these projects demonstrate the power of collaboration in creating places that are beautiful, sustainable and enduring.
Lion Green Road is a landscape-led residential development in the London Borough of Croydon, delivering 157 new homes across five sculpted pavilion buildings set within a richly planted parkland setting. The scheme responds to a challenging sloping site while creating a distinctive new neighbourhood that combines higher-density housing with generous open space, biodiversity and strong connections to the surrounding landscape. The pavilion arrangement maximises daylight, privacy and views, with homes organised around shared gardens, play spaces and allotments.
We developed the MEP design to Employer's Requirements Stage 3 and undertook sustainability, energy and overheating modelling to support planning, helping shape a scheme that prioritises comfort, resilience and low operational energy use. A fabric-first approach combines highly insulated, airtight construction with high-performance glazing and careful detailing of thermal bridges. To address the challenges of a warming climate, glazing ratios, solar gains and shading measures were carefully balanced, with inset balconies and deep window reveals helping to reduce overheating risk while maintaining excellent daylight levels. A high proportion of dual-aspect homes enables effective cross-ventilation, supported by generous opening windows and summer bypass modes on MVHR systems to provide low-energy cooling. Together with LED lighting and other passive design measures, these strategies create comfortable, low-carbon homes that are efficient to operate and resilient for the future.
“It’s fantastic to see Lion Green Road recognised on the Stirling Prize shortlist. Congratulations to the client, both architects and the wider project team for creating an exemplary development that demonstrates how great design and environmental performance can work hand in hand. Through a fabric-first approach, passive environmental design and significant on-site renewable energy generation, the project sets a benchmark for sustainable housing. We’re looking forward to joining the celebrations at the Stirling Prize ceremony in October.”
BEng EngD CEng FIMechE
Director, MEP Engineering
Partner
Mill Lane is part of Pembroke College’s £75 million wider masterplan and multi-phase transformation, the largest expansion of the college since the 14th century. The development includes the extension of several historic buildings and the creation of a new residential court.
The Mill Lane project represented a unique opportunity for Pembroke College to expand within the city centre, directly adjacent to its existing estate. Many of the buildings on the Mill Lane site were fully or partially retained and repurposed. The project transforms a congested urban site by bringing together listed and historically significant buildings with new development, providing social, teaching and living accommodation alongside flexible cultural and performance spaces that serve both the college and the wider city.
The project prioritised the transition away from gas boilers, creating a fossil fuel-free site through the integration of a low-carbon heating network. We worked together with the team to set the sustainability strategy, steering it through planning and a complex BREEAM assessment.
“The project's key driver was to sympathetically provide modern facilities within retained buildings, while preserving the site's history. The calm and considered designs of the buildings were highly detailed with input from all of the consultants to ensure the architectural vision was achieved. Space planning and interior design choices neatly conceal the huge challenge of reusing existing buildings that were designed with much lower levels of servicing in mind. This has allowed the college to expand into fossil fuel-free buildings that exceed current expectations, but with reduced carbon emissions. Personally, it was a great project to work on and we are immensely proud that the buildings have been so well received. Congratulations to Pembroke College, Haworth Tompkins and the entire project team on an outstanding achievement and a thoroughly deserved place on the 2026 Stirling Prize shortlist.”
BEng AMIMechE
Principal Engineer
Partner
The transformation of Hertford Theatre has created a fossil fuel free multi-purpose arts and culture venue for live performances and film.
We worked alongside Bennetts Associates to transform and extend Hertford Theatre, providing MEP engineering and sustainability consultancy for the arts venue, which is now fossil fuel-free. The project grew out of East Herts District Council’s recognition that culture is a vital contributor to the future prosperity and wellbeing of local people. The newly renamed BEAM cultural hub also provides an all-day café/bar and events spaces for community use.
BEAM incorporates the shell of the old theatre and its stage and backstage areas, but adds significant new spaces for the cinemas, studio, and café/bar spaces in a series of brick-clad volumes. These new spaces enclose a covered triangular courtyard space, which forms the main foyer. The main theatre was transformed from a 400-seat flat-floor room with a large retractable seating unit, into a 547-seat auditorium with a shallow-raked stalls, a balcony and a fully accessible technical grid. A second theatre space opened in 2025.
“BEAM proves that you don't need to choose between environmental ambition and creating great places for people. Behind the scenes, the project delivers a fully electric, fossil fuel-free venue with a strong focus on reducing both embodied and operational carbon. But what visitors experience is something much simpler: a welcoming, flexible and inspiring place for culture and community. That's exactly how it should be. We're incredibly proud to have been part of the team that transformed Hertford Theatre into BEAM, and we'd like to congratulate East Herts District Council, Bennetts Associates and everyone involved on achieving a place on the 2026 Stirling Prize shortlist.”
BEng MCIBSE CEng
Director, MEP Engineering
Partner
Working with Witherford Watson Mann and Freeland Rees Roberts, we are supporting Clare College's ambitious efforts to conserve and improve the Grade I-listed Old Court, undergoing a three-phase process to upgrade facilities for students, faculty, and staff and to preserve the historic building for future generations.
The River Room Café, designed by Witherford Watson Mann Architects, combines the challenges of working in a confined space and alongside historic building fabric, which meant that the structure was constructed in timber to sit within the space. The site required the clever use of light wells and exact detailing to fit the services into the cabinetry. The River Room uses a mixed-mode ventilation scheme including mechanical ventilation heat recovery (MVHR). Ductwork runs are concealed within services trenches in the slab, to maximise useable floor-to-ceiling heights while complying with strict planning requirements. The café, finely detailed in brick and wood, opens out to the River Cam with a view to the Fellows Garden. The main college kitchens were refurbished, and innovative MEP design utilised medieval chimney flues to route the kitchen extract ventilation.
“Clare College Old Court occupies a highly constrained site, requiring careful coordination with the architect to accommodate mechanical plant and service distribution routes while respecting the Grade I-listed building and the architectural vision for the new elements. Lightwells were carefully designed to bring daylight and visual interest into the building. The completed project is both sustainable and elegant. It's great this has been recognised through its shortlisting for the Stirling Prize.”
MEng
Principal Engineer
Partner
The four shortlisted projects in 2026 bring our total to 17 RIBA Stirling Prize-shortlisted projects, including three winning projects, in the last 20 years.
You can find many of our shortlisted projects, and read more about them, on our Awards page.
We look forward to the awards ceremony and announcement of the winner at the RIBA Stirling Prize ceremony in October. You can read about all the six shortlisted projects on the RIBA website.
Total of 3 projects