Queen Elizabeth II Hospital

East & North Hertfordshire NHS Trust

Installation of a large drainage network; formation of a 12,000m2 car park with by-pass separator; construction of courtyard from
sub-base and laying of granite pavement.

New £23.6m NHS Hospital for the Community in Welwyn Garden City


Works involved deep excavation to 3.5 meters depth which required trench support sheeting. A 1000m3 pit was excavated to accommodate a large attenuation tank. Membranes were installed along with a by-pass separator, drainage gullies and flow control values into manhole covers.

The hospital courtyard also required deep excavation and trench support sheeting. Surface levels were raised to new design levels by importing 10,000 tonnes of fill material. Reinstatement works were carried out using granite block paving. Car park surfaces were reinstated using 3,000 tonnes of asphalt.


  • Due to restricted access, 10,000 tonnes of fill material had to be moved into the courtyard by conveyor belt.
  • Working adjacent to a ‘live’ hospital and managing site safety and security.
  • Liaising with client on handover of areas to ensure continued running of the hospital was not impaired and project not impacted by delays.


Phase 2 now complete and overall project delivered on time with client pleased with the end product.

Client Name
East & North Hertfordshire NHS Trust
Main Contractor
Balfour Beatty
Mackin Value
12 Months
  • QE 2 Hospital 1
  • QE2 Hospital 2
  • QE2 Hospital 3
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