The Harlow Health Security Campus is moving back toward construction after years of reviews, cost increases and procurement delays.

The UK Government has approved a new program business case, clearing the way for renewed procurement across the major construction packages and keeping Kier attached to the technically demanding H50 high‑containment laboratory building.

The wider programme carries a £3.52 billion funding envelope, which includes VAT, inflation, risk allowances and relocation costs.

The government plans to reinstate Kier’s pre‑construction services agreement for the H50 building, noting that replacing Kier could trigger another 12‑to‑18‑month procurement process that would threaten the programme’s position in a constrained high‑containment market.

For the wider campus, officials will launch a fresh two‑stage Tier 1 tender, with procurement expected to begin in November, according to Construction Enquirer.

Early construction works are scheduled to begin in 2028, with main construction slated for the final quarter of 2029, demolition of the existing main building to ground level, and validation and dual‑running from early 2034.

The full campus is targeted to become operational in September 2038, with UK Health Security Agency (UKHSA) continuing to run existing facilities during the transition.

Scope and purpose of the Harlow campus

The campus will consolidate UKHSA operations from Porton Down, Colindale and its London headquarters, bringing together up to 2,500 roles currently spread across those sites.

It includes two principal construction packages: the H50 High Containment Building, housing Containment Level 3 and Level 4 laboratories with air‑fed protective suits for the most dangerous pathogens, and the main campus with laboratories, offices, logistics, security, education buildings and extensive infrastructure such as an energy centre and roads.

The programme aims to strengthen national capacity for responding to infectious disease threats and biological emergencies, supporting the UK’s broader biosecurity and scientific resilience objectives.

Economic and regional benefits

Harlow Council estimates the completed campus could create about 2,750 high‑quality jobs and generate significant local economic benefits through construction activity.

The site sits within the London‑Cambridge Innovation Corridor, contributing to wider regeneration and supporting the UK’s drive for greener healthcare infrastructure as part of the NHS net‑zero ambition.

Upcoming steps and timeline

The government will reinstate Kier’s pre‑construction services agreement for the H50 building while a new two‑stage Tier 1 tender for the wider campus is expected to launch in November, followed by early works in 2028 and main construction in late 2029.

Seven professional services procurements are planned for 2027/28, and the programme’s net present social value has been estimated at £6.70 bn with a benefit‑cost ratio of 4.77.