A housing project in south London has won the UK’s most prestigious architecture prize.
Lion Green Road, a housing scheme in Coulsdon commissioned by Croydon Council, won the Royal Institute of British Architects (RIBA) Stirling Prize 2026.
The suburban scheme by Mary Duggan Architects delivers 157 homes, divided across five blocks, combining privately-owned and socially-rented properties.
Replacing a former car park on a challenging, sloping site that varies in height by eight metres, RIBA president Chris Williamson praised the design as a "new approach to higher density development" creating "a new connection between the bustling Lion Green Road and a distinctive area of green parkland beyond".
The arrangement uses the site's changing levels and views to create a new "living landscape" for 635 residents, RIBA said.
Lion Green Road
RIBA
A spokesperson said said: “Notwithstanding subtle variations in height, each of the five sculpted blocks is built to the same specification.
“However, each is carefully rotated and positioned to respond to the site's topography and offer distinct views, with some looking towards the historic monument - the Surrey Iron Railway - a fragment of the world's first fully independent public railway.
“The shared design creates a coherent family of buildings that belong within the landscape. Unified by a palette of brickwork in three subtle shades of brown, the housing blocks blend into the parkland beyond, while small variations in pattern add texture and give each building its own identity.
“Arranged around open, shared outdoor spaces, and with access to a new public pathway from Lion Green Road to parkland beyond, the blocks encourage interaction between residents and help foster a strong sense of community.
“Inside, every home is dual-aspect, drawing in generous daylight, while private balconies are carefully positioned to avoid directly overlooking neighbouring homes. This thoughtful, carefully considered arrangement allows the buildings to sit closer together while giving residents open views from their own outdoor spaces. The result is density achieved through careful orientation and planning, rather than at the expense of privacy, daylight or views.”
Lion Green Road
Lorenzo Zandri
The project was designed and built to reduce its environmental impact. By using efficient construction methods, simple finishes, and a more streamlined building process, Lion Green Road was able to cut carbon emissions.
Speaking on behalf of the RIBA Stirling Prize Jury, Chris Williamson, RIBA President, said: "At a time when we urgently need to deliver more homes, Lion Green Road shows that density can be achieved without compromising the quality of the places we create. Through a consistent specification, with subtle variation in height and orientation, it offers housing at scale without uniformity.
“The architects have created a new kind of garden neighbourhood that balances privacy and generous views with a strong connection to nature - it's a living landscape.
This is thoughtful, resourceful architecture that proves that even the most challenging of sites can be transformed into truly distinctive places for people to call home."
Mary Duggan, Director, Mary Duggan Architects, on behalf of Mary Duggan Architects, RUFFARCHITECTS and the London Borough of Croydon, said: We believe the significance of Lion Green Road lies in what it says about the future of housing: that architectural ambition, social value and generosity can co-exist within the realities of contemporary development.
The project transforms a challenging suburban site into 157 homes woven through a mature, accessible landscape, using topography, shared space and carefully calibrated thresholds to support a rich culture of dwelling. Its transformative values are not expressed through spectacle, but through the everyday experience of living in a secure, generous environment - supporting privacy and encounter, independence and belonging, and the multiple patterns of contemporary domestic life."