CIBA Laboratories

What: Pharmaceutical factory, offices and laboratories
Where: Horsham, West Sussex
Built: 1937-8 with additions in 1985.
Architect: F. W. Halfhide & R. J. O'Donoghue, additions by Cruikshank & Seward
Abandoned: 2015
Listed: No.
Visited: 2020, 2026
Last Known Condition: Derelict
Page Updated: May 2026

I remember the old CIBA/Novartis site in Horsham from my college days, a closed-off hi-tech enclave of people in white coats doing mysterious experiments in glass-fronted buildings behind high fences. Occasionally it would be picketed by anti-vivisectionists - rumour had it that gruesome experiments were carried out there on primates - probably untrue as it turns out - though there were mice, rats, rabbits and even tree-frogs at different times. When it closed in 2014, Horsham lost one of its biggest employers, a blow to the town still talked about to this day. As an Urban Explorer, the empty buildings taunted me for nearly ten years: I passed them every day on my way to and from work and often checked the perimeter for some way in - a gap in the fence, a change in security shifts, an open gate, but had no luck. I came close in 2020 when a tree fell across the fence, but the main building itself was locked up tight. It was not until Easter 2026, with redevelopment looming, that my luck finally changed.

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The Swiss Gesellschaft für Chemische Industrie Basel (CIBA) came to Horsham in 1937, choosing a site of approximately 20 acres in the fork of the Three Bridges and Dorking railway lines. Close to a water supply and offering scope for the construction of a railway siding, the location was ideal for CIBA's new headquarters and drug manufactory in the UK.
The first buildings were constructed to the designs of architects F. W. Halfhide and R. J. O'Donoghue in 1938, in the Modern International Style using pale buff bricks from Coalville in Leicestershire. A long drive flanked by two gate lodges led to a large E-shaped building comprising offices, production facilities and canteen, with a central clock tower over the main doorway; unusually the clock faces away from the main drive towards the garden courtyard, allowing the front of the tower to incorporate an uninterrupted wall of glass bricks lighting the main stairwell.

Pharmaceutical production started at Horsham in 1939 and continued throughout the war. In 1950 CIBA established a medical department here, followed by a research and development division opened in 1965 in new brutalist buildings to the north of the main drive. In 1970 the company merged with another Swiss pharmaceutical company, J. R. Geigy S.A. to form CIBA-Geigy. The conglomerate had its UK headquarters at Horsham, and the site continued to be an important centre of parmaceutical research and development, by this time employing nearly 1,000 people. In 1985, a five-storey wing by architects Cruikshank and Seward was added to the main building, creating an enclosed internal courtyard. Large laboratory and factory buildings were added to the east some time later.

In 1996 CIBA-Geigy merged with yet another Swiss firm, Sandoz, to form Novartis. Horsham housed the organisation's UK Headquarters and the Novartis Institutes for Biomedical Research in respiratory disease, recognised internationally as a centre of excellence. Novartis was still one of Horsham's largest employers in March 2011 when the company announced a major restructuring plan that involved cutting up to 550 of the 950 jobs here; manufacturing and global development were wound down and gastrointestinal research was moved to Basel. The pharmaceutical giant’s UK board had approved redevelopment of the site, parcelling off some land for new housing and other usages, but stated it was committed to Horsham with plans to invest in the facility long-term. In 2013, however, Novartis' UK President, Sue Webb, confirmed that the Horsham site would close permanently the following year with the loss of 371 jobs. As well as a “difficult” climate in the UK for pharmacauticals (largely thanks to an increasingly ambiguous relationship with the European Union and public opposition to animal testing), the company was going through yet another restructuring, concentrating research in three major hubs in Shanghai, Boston (USA), and Basel; as Ms Webb said, “Economies of scale mean it is better to consolidate into those three hubs rather than have them distributed throughout the world.” The last employees left Horsham in the summer of 2014, and shortly thereafter all buildings were demolished except for the main office building.

In 2016 the West Sussex County Council purchased the site for an undisclosed sum with a view to developing a business park for health and life sciences which would bring up to 1,000 new jobs to the area. Protracted discussions followed, interrupted by a global pandemic and recession, leading ultimately to the abandonment of these plans; per the most recent planning application, the site is to be redeveloped entirely as housing with only the locally-listed clock tower retained.
In the meantime the single remaining building has stood empty, colonised by countless pigeons and a pair of nesting peregrine falcons (which being a protected species have delayed redevelopment even further). There is little here to recall the site's decades at the forefront of pharmaceutical research, but even stripped back to the bare concrete it is a remarkable building.

Sources

Ciba in Britain: New Fundamental Research Unit at Horsham, Nature 207, pp236–239, 1965, [https://doi.org/10.1038/207236a0] accessed 14/05/26

Homes and science park plan for Horsham Novartis site, BBC News, 07/01/15, [https://www.bbc.co.uk/news/uk-england-sussex-35254006

Novartis Country President UK explains why the company intends to pull out of Horsham with the loss of 371 local jobs, Sussex World, 09/11/13 [https://www.sussexexpress.co.uk/news/exclusive-novartis-country-president-uk-explains-why-the-company-intends-to-pull-out-of-horsham-with-the-loss-of-371-local-jobs-2316823] accessed 14/05/26

Novartis job cuts plan in Horsham 'shocking', BBC News, 17/03/11, [https://www.bbc.co.uk/news/uk-england-sussex-12779594] accessed 14/05/26

▪ Howes, L., "Novartis to shut Horsham site", Chemistry World, 06/11/13, [https://www.chemistryworld.com/news/novartis-to-shut-horsham-site/6767.article] accessed 14/05/26

▪ Horsham District Council Planning Application, DC/25/0629

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