The biomes consist of hundreds of hexagonal and pentagonal ethylene tetrafluoroethylene (ETFE) inflated cells supported by geodesic tubular steel domes.

There are plans to build an Eden Project North in the seaside town of Morecambe, Lancashire, with a focus on the marine environment.

The work was hampered by torrential rain in the first few months of the project, and parts of the pit flooded as it sits 15 m (49 ft) below the water table.

To counter criticism from environmental groups, the Eden Project committed to investigate a rail link to the site.

[9] The rail link was never built, and car parking on the site is still funded from revenue generated from general admission ticket sales.

A bus service links the site to St Austell railway station, on the Cornish Main Line.

In 2007, the Eden Project campaigned unsuccessfully for £50 million in Big Lottery Fund money for a proposed desert biome.

[16] In 2016, Eden became home to Europe's second-largest redwood forest (after the Giants Grove at Birr Castle, Birr Castle, Ireland) when forty saplings of coast redwoods, Sequoia sempervirens, which could live for 4,000 years and reach 115 metres in height, were planted there.

[20] The project was conceived by Tim Smit and Jonathan Ball, and designed by Grimshaw Architects and structural engineering firm Anthony Hunt Associates (now part of Sinclair Knight Merz).

Once into the attraction, there is a meandering path with views of the two biomes, planted landscapes, including vegetable gardens, and sculptures that include a giant bee and previously The WEEE Man (removed in 2016), a towering figure made from old electrical appliances and was meant to represent the average electrical waste used by one person in a lifetime.

The covered biomes are constructed from a tubular steel (hex-tri-hex) with mostly hexagonal external cladding panels made from the thermoplastic ETFE.

The ETFE technology was supplied and installed by the firm Vector Foiltec, which is also responsible for ongoing maintenance of the cladding.

The steel spaceframe and cladding package (with Vector Foiltec as ETFE subcontractor) was designed, supplied and installed by MERO (UK) PLC, who also jointly developed the overall scheme geometry with the architect, Nicholas Grimshaw & Partners.

Grimshaw developed the geometry of the copper-clad roof in collaboration with a sculptor, Peter Randall-Page, and Mike Purvis of structural engineers SKM Anthony Hunts.

Seed is a large, 70 tonne egg-shaped installation, carved from a single block of granite from De Lank Quarry on Bodmin Moor, standing some 13 feet (4.0 m) tall and displaying a complex pattern of protrusions that are based upon the geometric and mathematical principles that underlie plant growth.

The sun can provide massive solar power and the wind has been harnessed by humankind for thousands of years, but because both are intermittent and battery technology cannot yet store all we need there is a gap.

[32][33][34] In July 2024, Lancaster City Council received the first £2.5m of a promised £50m in UK government funding for the scheme.

[35] In May 2020, the Eden Project revealed plans to establish their first attraction in Scotland, and named Dundee as the proposed site of the location.

[38] In 2021, Eden Project announced that they would establish fourteen hectares of new wildflower habitat in areas across Dundee, including Morgan Academy and Caird Park.

[46] Since 2002, the Project has hosted a series of musical performances, called the Eden Sessions, usually held during the summer.

The Eden Project has appeared in various television shows and films such as the James Bond film Die Another Day, The Bad Education Movie, in the Netflix series The Last Bus, in the CBeebies show Andy's Aquatic Adventure and in Armenia’s postcard in the Eurovision Song Contest 2023.

On 18 November 2019, on the Trees A Crowd podcast, David Oakes interviewed Eden Project's Head of Interpretation, Dr Jo Elworthy, about the site.