ade possible by money raised by National Lottery players, the project is the result of an innovative partnership between Northumberland National Park Authority and YHA (England and Wales). The Heritage Lottery Fund awarded a National Lottery grant of £7.8m towards The Sill project to help transform how people connect with the landscape.

Designed by JDDK Architects for the Northumberland National Park Authority (NNPA) and YHA (England and Wales), the 18-month construction programme began in late 2015. On its opening weekend, The Sill had over 5000 visitors with superb reviews for both the facilities and building itself.

Named after the adjacent Great Whin Sill, the volcanic crag on which Hadrian’s Wall is partly built, the building forms the heart of a seven-year investment plan to increase visitor numbers to the Northumberland National Park and Hadrian’s Wall World Heritage sites.

The facility has been designed as a showcase of local pride and passion, featuring an exhibition space, learning and event spaces, a local produce cafe, rural business hub, a world-class 86-bed youth hostel and a shop specialising in local crafts and produce.

But, for many, it’s the actual building that is the main attraction. The result of a truly local enterprise, with more than 3000 local residents taking part in the extensive community consultations during the design period and 90% of the construction employment coming from within the region. The most striking feature is the Whin Sill grass roof, planted to replicate the unique natural grasslands of the surrounding area. The Sill’s fully accessible living roof sweeps gently upwards, giving visitors a bird’s eye vantage point across one of the UK’s most magnificent landscapes and the UNESCO World Heritage Site of Hadrian’s Wall.

JDDK Project Architect, Alison Thornton-Sykes, commented: “The Sill is inspired by the Great Whin Sill, Northumberland’s internationally-renowned geological feature, and grows from the landscape that surrounds it. An aerial view of the wider landscape shows these dramatic geological outcrops as diagonal ripples in the landscape. The building is developed as another ripple rising out of the landscape so that the diagonal flowing lines of the building echo the natural undulations and outcrops in the landscape.

“We hosted a series of open events and workshops where we discussed site layout, materials and architectural style. The participative design process gave the local community a chance to get involved, voice their opinions and feel some ownership of the project. It also allowed us to draw on a vast wealth of local knowledge and expertise.”

The building has also been designed on sustainable principles to target a BREEAM ‘Very Good’ rating, including orientation to maximise on solar gains in some of the public spaces while offices are placed to the north to prevent overheating. A central atrium provides daylight into the heart of the building while allowing a summertime natural ventilation strategy and mechanical ventilation with heat recovery in the winter.

The south-facing entrance canopy provides solar shading to the glazed frontages of the classrooms and main entrance while also supporting photovoltaics for generating electricity. Solar panels are also incorporated on the youth hostel roof to provide hot water while the remaining Whin Sill vegetation roof increases biodiversity and reduces surface water runoff. The building also incorporates high levels of insulation and airtightness, low embodied energy materials and enhanced ecology including habitats for bats and birds.

As such, the building harmoniously reflects the distinctiveness of the Northumbrian landscape in both its shape and the materials used in its construction, rising from the Northumberland landscape with little impact on the environment, perfectly mirroring its inspiration; the unique landscape of the Hadrian’s Wall corridor. 80% of the external walls of the building are finished in local materials including Whin stone, sandstone and native larch.

Alison added: “The whole team at JDDK are incredibly proud of what we achieved at The Sill. Our brief was for a landmark building which would become the hub of visitor activities, welcoming visitors and supporting communities throughout the Northumberland National Park. Sustainability and public consultation were at the core of the design process with the finished building inspired by the rugged Northumbrian countryside. A contemporary addition to the landscape, respectfully fitting into its natural surroundings.”

Tony Gates, Chief Executive of Northumberland National Park Authority, commented: “The unique concept and rural location of The Sill: National Landscape Discovery Centre, located in a National Park and within the Hadrian’s Wall World Heritage site, presented challenges which required experienced and high-quality architectural design services. JDDK took the building from a list of required uses through an extensive and detailed public engagement process, establishing a public desire for a modern design response in this key heritage location. This has ultimately led to a building in, and of, the landscape, with its very fabric drawn from the land within which it sits.

“The Sill is the largest project of its kind undertaken by a National Park anywhere in the country. Its opening weekend was a huge success and the very first stepping stone towards achieving our vision to excite, inspire and enable people of all ages to understand and explore the landscapes, history, culture and heritage of Northumberland.”