Harley Street Health District releases first annual Impact Report

For the first time, The Harley Street Health District has published its 2026 Impact Report, demonstrating significant growth in market value, private healthcare activity, and economic contribution. 

The report examines the combined market value of the activity conducted by the District’s occupiers and the changes in clinical trends over the last 12 months. Under the guidance of The Howard de Walden Estate – landlord and long-term steward of the Harley Street Health District brand – the District has seen significant growth across multiple measures. 

Harley Street Health District’s private healthcare activity was worth an estimated £1.85 billion last year, representing 11.2% of the UK’s total private healthcare market by patient volume. 

Private spells – a continuous period of care as an inpatient or day-case patient under private treatment –  increased by 10% compared with the previous year, representing approximately £143 million growth in 12 months. 

The District contributed an estimated £810 million to the UK economy in the last year (estimated GDP contribution), with this figure predicted to reach £911 million in the next year. 

Investment in HealthTech property in the District totalled £42.4 million from The Howard de Walden Estate last year. 

Spanning 95 acres of Marylebone, the historic District has grown into a thriving private healthcare ecosystem with nearly 300 occupiers, including HCA Healthcare UK, The London Clinic with Northwestern Medicine, Welbeck Health Partners, Mayo Clinic Healthcare, Cleveland Clinic, King Edward VII Hospital, Cedars-Sinai Clinic London and NHS Private Patient Units. 

The report also highlights significant growth in private chemotherapy activity. A total of 17,865 private chemotherapy treatments were delivered in Harley Street Health District last year, a 25% increase compared with the previous 12 months. Cancer treatment now accounts for 28% of the District’s activity, well above the private healthcare national average of 12.3%, and one in four private chemotherapy treatments delivered in the UK took place within the District. 

Chemotherapy is the District’s most common procedure, followed by cataract surgery and internal medicine diagnostics. 

Commenting on the findings, Mark Kildea, Chief Executive of The Howard de Walden Estate, said: 

“Since 1860, Harley Street Health District has been the home of healthcare. Today, it is evolving into a powerhouse of innovation, collaboration and economic growth. Our Impact Report demonstrates that the District is booming, driving real market value and positive change across the UK healthcare system. We are just getting started, with new occupiers and developments happening constantly and we look forward to further growth and innovation to come.” 

The Rt Hon Lord Kakkar KG KBE, Emeritus Professor of Surgery at University College London, added: 

“These results underline the important economic and clinical impact of the Harley Street Health District. Uniquely positioned in the centre of London, the District has the potential to serve global healthcare, attracting international patients, world-leading providers and inward investment, and strengthening the UK’s position as a destination for both care and innovation.”

Harley Street Health District has been the home of health since 1860 and continues to play a central role in shaping the future of healthcare, innovation and investment in the UK. 

Read the full report here: https://harleystreethealthdistrict.com/impactreport2026/