Harperbury Hospital

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Radlett, Hertfordshire


  • - Bloor Homes

Our Roles

  • - Project Manager
  • |
  • - Quantity Surveyor

"Alun and his team have successfully worked on a number of large consortium projects working with all developers involved in a fair and professional manner as well as co-ordinating infrastructure and services at the early stages of construction and I would have no hesitation in recommending the services offered by
Isaac Mercer Ltd"

Carl Slater
Construction Director | Bloor Homes South Midlands
The Brief
To work with developers and other stakeholders to prepare this brownfield site for housing development.


A labyrinth of derelict mental health hospital buildings dating back to the First World War needed to be cleared to create 200 new houses for Bloor Homes.

Working alongside the mental health hospital, the works needed to be undertaken with sensitivity, with particular consideration for the shared access routes of the hospital.


Given the deteriorated state of the original buildings, the site required extensive asbestos removal, demolition, remediation and infrastructure works in preparation for the construction of the new homes.

We ensured that the creation of a new S278 roundabout was a priority to ensure continuous access for the nearby hospital, and managed detailed traffic and pedestrian routes. Because these works were undertaken on a major M25 diversion road, we were required to handle challenging traffic management issues.

Remediation was managed in a cost-effective way whilst complying with strict ecological regulations. The phasing of the demolition of buildings with bat roosts was prioritised to be completed within the required seasonal timings, whilst ensuring creation of new bat roosts to mitigate ecological impacts for works to commence.

Other Developers / Stakeholders:

  • - Department of Health
  • |
  • - NHS

Key Works:

  • S278 Works
  • Demolition of Existing Buildings and Underground tunnels
  • Ground Remediation
  • Bulk Earthworks