Innovation, Heritage, and Community: Lion Green Road Claims the 2026 RIBA Stirling Prize as Global Architecture Celebrates 30 Years of Excellence

LONDON — In a landmark moment for the global architectural community, the Royal Institute of British Architects (RIBA) announced today (15 October) the winner of the prestigious Stirling Prize for 2026. Marking its milestone 30th anniversary, the accolade has been awarded to Lion Green Road in Coulsdon, South London—a visionary housing scheme designed by Mary Duggan Architects (with delivery by RUFF Architects).

The announcement, delivered following months of intense nationwide anticipation, highlights a growing shift in British architecture toward context-driven, socially responsible, and landscape-first design. Selected from a fiercely contested shortlist of six diverse architectural marvels, Lion Green Road triumphed for its ingenious handling of a complex topographical site, its seamless integration of private and affordable housing, and its commitment to community-centric public space.

Main Facts: The 2026 Stirling Prize Winner

Lion Green Road comprises 157 mixed-tenure dwellings (spanning both private sale and affordable housing) organized across five striking, prismatic 13-sided blocks. Situated on the green hillside of Coulsdon on the southern edge of Greater London, the project had to navigate formidable site constraints.

These included a dramatic eight-meter level change across a geological basin, the preservation of access to adjacent open lands to the rear, and the stringent requirement to protect a nearby scheduled monument associated with the historic Surrey Iron Railway.

Instead of imposing a dominating corporate footprint on the landscape, Mary Duggan Architects employed a gentle, highly sculptural approach. The buildings are clad in textured brick, meticulously patterned to create subtle visual dialogue with the surrounding greenery. Balconies and sightlines were engineered to prevent direct overlooking, allowing the residential pavilions to sit closer together without sacrificing privacy or long-distance views across the valley.

The project’s identity is anchored by a richly planted, biodiverse landscape strategy that effortlessly binds the multi-level site together. It incorporates a wide array of shared amenities, including children’s play areas, communal seating zones, and dedicated urban growing spaces, all threaded through by public pathways designed to maximize neighborhood permeability.

Chronology: The Road to the 2026 Accolade

The journey toward the 2026 RIBA Stirling Prize winner unfolded over a rigorous, months-long evaluation process:

• Early Summer 2026: RIBA announced the official six-project shortlist, sparking nationwide debate across architectural circles regarding typology, scale, and the evolving purpose of the built environment.
• Summer through Autumn 2026: The judging panel—chaired by high-profile industry leaders—conducted meticulous site visits, assessing each project’s structural performance, sustainability metrics, and everyday social impact.
• 15 October 2026: RIBA officially celebrated the 30th anniversary of the Stirling Prize by crowning Lion Green Road the ultimate winner during a packed ceremony in London, alongside the presentation of several international accolades.

Supporting Data: The 2026 RIBA Shortlist and Global Winners

The competition for the 2026 Stirling Prize was among the most diverse in recent memory, testing jurors across varying scales, budgets, and typologies. The five runners-up on the elite shortlist showcased the breadth of contemporary British design:

1. A House at Fairmead (High Beach, Epping Forest) by Sergison Bates

Nestled on the rural fringes of Epping Forest, this understated residential home prioritizes material and formal restraint to let nature take center stage. Built using sustainable techniques—including insulating clay blocks finished in internal lime plaster for optimal thermal management—the house features a dramatic 4.5-meter-high living room that anchors the home in a masterclass of spatial compression and expansion.

2. Beam (Hertfordshire) by Bennetts Associates

A striking multi-arts venue on the banks of the River Lea, Beam represents a forward-thinking transformation of the ageing 1970s Hertford Theatre. By wrapping the original structure in a contemporary brick envelope, the council-led retrofit houses a modern cinema, multi-use theatre spaces, and community hubs, underscoring the vital role of adaptive reuse in civic architecture.

3. Paddington Square (London) by Renzo Piano Building Workshop in collaboration with Adamson Associates

A masterclass in urban infrastructure, Paddington Square introduces a transparent, glass-cube mixed-use tower alongside a bustling public plaza. The project fundamentally re-engineered the surrounding streetscape to establish direct, highly visible pedestrian access to the transport hub below, integrating the Bakerloo line entrance, retail, and workspace into a cohesive civic destination.

4. Pembroke College, Mill Lane (Cambridge) by Haworth Tompkins

This ambitious expansion within Cambridge’s Historic Core Conservation Area blends six modernized historic buildings with six brand-new structures. The scheme successfully bridges academic heritage with modern student life while implementing aggressive passive design strategies, including triple glazing, exposed thermal mass, and photovoltaic arrays.

5. River Wing, Clare College (Cambridge) by Witherford Watson Mann Architects

Addressing a notoriously difficult Grade I-listed site, this project upgraded a series of underused, unfit-for-purpose spaces to modern academic standards. Historic brick walls were harmoniously paired with a tactile interior palette of structural oak, wall panelling, and Purbeck stone floors, resulting in a seamless union of past and present.

Beyond the Stirling: International and Emerging Honors

The evening also celebrated achievements beyond the UK borders. The RIBA International Prize 2026 was awarded to the Green Field Factory of Karupannya Rangpur Limited in Bangladesh, designed by Nakshabid Architects. The seven-storey textile facility redefines industrial architecture by treating the workplace as a wellbeing and community hub deeply rooted in rural Bengali vernacular.

Meanwhile, the RIBA International Emerging Architect Award 2026 went to Ghent-based studio Maker Architecten (led by Ana Castillo and Lieven De Groote) for their urban residential project YIMBY (Yes In My BackYard) in Kortrijk, Belgium, which revitalized a 1920s garden-city neighborhood through sensitive reuse rather than wholesale demolition.

Official Responses and Jury Statements

The 2026 RIBA Stirling Prize judging panel was chaired by RIBA President Chris Williamson, alongside a distinguished panel including 6a architects director Stephanie Macdonald, RSHP senior director Tracy Meller, CIBSE head of net zero policy Dr. Julie Godefroy, Sir John Soane’s Museum director Will Gompertz, and Autodesk VP of Product & Experience Catherine Winfield.

In their formal citation for Lion Green Road, the jury praised the development’s holistic philosophy:

"[It] delivers meaningful public benefit while offering high-quality amenity for residents and supporting a strong sense of community. The project stands out through a combination of inventive yet relatively quiet design, a site-specific attitude, and a landscape-first approach that weaves the pavilion arrangement into the natural context."

Reflecting on the broader state of the profession during the prize’s landmark 30th anniversary, RIBA President Chris Williamson noted:

"This year’s shortlist shows us what architecture can achieve when creativity, purpose and public value come together. In their distinct ambitions to revitalise communities, transform public infrastructure, deliver exemplary housing, carefully evolve historic institutions and create a thoughtful new home, these projects show that UK architecture is not only defined by style, but by true impact on people and place."

Adding to the sentiment regarding international efforts, the creators of the YIMBY project, Maker Architecten, remarked:

"At a time when affordable housing, resource scarcity and social fragmentation are pressing challenges across Europe, we believe the existing city is one of our most valuable resources. YIMBY is an attempt to work with that potential, creating new value without erasing the stories embedded in the place."

Implications for the Future of Architecture

As the RIBA Stirling Prize enters its fourth decade, the selection of Lion Green Road signals a profound cultural pivot in how the architectural profession measures success. For decades, the accolade frequently gravitated toward standalone monuments, high-culture institutions, or ultra-luxurious private domains.

By awarding top honors to a suburban, mixed-tenure housing project that gracefully resolves complex topography and municipal needs, RIBA has sent a powerful message: the future of architectural excellence lies in social equity, ecological sensitivity, and adaptive placemaking.

Lion Green Road demonstrates that high-density public housing does not require high-rise alienation; instead, through meticulous contextual engagement, careful material selection, and biodiverse master-planning, affordable and private homes can coexist to elevate entire communities. As cities worldwide grapple with housing shortages, climate vulnerability, and the need for urban repair, Mary Duggan’s triumphant scheme provides a vital blueprint for the next thirty years of architectural practice.