The company undertook a number of projects for the University of Oxford, including at the Clarendon Laboratory, Denys Wilkinson Building, Mathematical Institute, Merton College, Queen Elizabeth House, Osler House, and a number of other departments. In June 2012, the New Radcliffe House on Walton Street, the new location of the Jericho Health Centre, on the Radcliffe Observatory Quarter development site, was completed by Longcross.
From 2012, the Castle Mill site (400m × 25m) between the Cripley Meadow Allotments to the west and the railway tracks by the Castle Mill Stream to the east, north of Oxford railway station on Roger Dudman Way, was developed as extensive student accommodation for the Oxford University Estates Directorate (OUED) by Longcross. The development was controversial due to its visibility from Port Meadow, an historic area of undeveloped land to the north. Among other environmental issues, there are badgers on the site.
Anger was caused even among members of Oxford University. The development was likened to building a "skyscraper beside Stonehenge". In February 2013, Oxford City Council entered negotiations with Oxford University to reduce the height of the buildings by two storeys. Longcross states that "Engaging with the local community is vital to Longcross’ work as a considerate constructor and Castle Mill is no exception". and claims that the company is "known for [its] non-adversarial approach".
In a 'Considerate Constructor Scheme' (CCS) audit[when?] on the Castle Mill site, the auditor made remarks about:
- the site team that took part in a one-day event, organised by the public, to help clean the River Thames;
- the work with National Rail to ensure the long term safety of the Badger's, and the construction of a Badger run down one side of the site;
- rigorous environmental management controls in place and a clear focus on sustainable construction.
However, in May 2013, it emerged that pollution at Castle Mill had not been checked before work begin, as was required in the planning permission.
In June 2013, Castle Mill was nominated for the 2013 Carbuncle Cup, an annual award by Building Design for "the ugliest building in the United Kingdom completed in the last 12 months." It is described as "A deeply unimaginative and impoverished design which would lower the spirits whatever its setting, but on the edge of one of central England’s most important and ancient landscapes, it is an outrage."
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- "Castle Mill Student Accommodation". UK: Considerate Constructor Scheme. 2014. Retrieved 30 January 2020.
- "Carbuncle Cup nomination — Castle Mill housing, Port Meadow, Oxford by Frankham Consultancy Group". www.bdonline.co.uk. UK. 11 June 2013. Retrieved 19 June 2013.