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Porton - Main Plenum Replacement (North-East Wing)

UK Health Security Agency

This public procurement record has 2 releases in its history.

Award

08 Oct 2026 at 11:10

UK6 - Contract Award Notice
Award

08 Oct 2026 at 11:04

UK5 - Transparency Notice
Summary of the contracting process

The UK Health Security Agency is procuring building works at Building 1, Porton Down: complete replacement of asbestos-contaminated supply and extract ductwork in the North-East Wing phase of its Main Plenum Replacement project. The work covers both supply and extract ducts and is a full replacement, rather than a limited repair. It sits within the agency’s wider project to replace the building’s main plenum. The requirement is specifically for the North-East Wing at Porton Down, so it is most relevant to contractors able to deliver building and mechanical services work at this site, including work involving contaminated ductwork.

The procurement is complete and the contract was awarded directly to Limburn Boiler & Heating Services Ltd. The buyer justified a direct award for additional or repeat works: changing supplier could result in incompatible works and disproportionate technical difficulties in operation or maintenance. The award date was 8 October 2026. The awarded value is £7,000,000. The contract period runs from 22 October 2026 to 30 July 2027, with signature scheduled for 22 October 2026. There is one lot, and the procurement was considered suitable for SMEs and voluntary, community and social enterprises. The published data gives no separate scoring or evaluation criteria for comparing bids.

This award shows demand from the UK Health Security Agency for major building works involving full replacement of contaminated supply and extract ductwork at Porton Down. Limburn Boiler & Heating Services Ltd, an SME, was selected through a direct award because continuity with the existing supplier was considered important to avoid incompatibility and disproportionate technical difficulties in operation or maintenance. A supplier competing for a similar requirement from this buyer would need credible building-services delivery capability, including the technical capacity to replace supply and extract ductwork in an asbestos-contaminated setting. Experience managing the interfaces with existing systems and the operational risks of changing contractors would be commercially relevant, as would the capacity to undertake a substantial, site-specific package of works.

How relevant is this notice?

Notice Information

Notice Title

Porton - Main Plenum Replacement (North-East Wing)

Notice Description

Full replacement of the asbestos contaminated supply and extract ductwork in the North-East Wing (NEW) Phase of the MPR Project, Building 1, Porton Down

Procurement Information

Sch. 5 para. 7 - Additional or repeat goods, services or works The public contract concerns the supply of goods, services or works by the existing supplier which are intended as an extension to, or partial replacement of, existing goods, services or works in circumstances where (a) a change in supplier would result in the contracting authority receiving goods, services or works that are different from, or incompatible with, the existing goods, services or works, and (b) the difference or incompatibility would result in disproportionate technical difficulties in operation or maintenance.

Notice Details

Publication & Lifecycle

Open Contracting ID
ocds-h6vhtk-07837a
Publication Source
Find A Tender Service
Latest Notice
https://www.find-tender.service.gov.uk/Notice/095092-2026
Current Stage
Award
All Stages
Award

Procurement Classification

Notice Type
UK6 - Contract Award Notice
Procurement Type
Standard
Procurement Category
Works
Procurement Method
Direct
Procurement Method Details
Direct award
Tender Suitability
SME, VCSE
Awardee Scale
SME

Common Procurement Vocabulary (CPV)

CPV Divisions

45 - Construction work

CPV Codes

45210000 - Building construction work

Notice Value(s)

Tender Value
Not specified
Lots Value
Not specified
Awards Value
£7,000,000 £1M-£10M
Contracts Value
Not specified

Notice Dates

Publication Date
8 Oct 20262 weeks ago
Submission Deadline
Not specified
Future Notice Date
Not specified
Award Date
8 Oct 20262 weeks ago
Contract Period
22 Oct 2026 - 30 Jul 2027 6-12 months
Recurrence
Not specified

Notice Status

Tender Status
Complete
Lots Status
Complete
Awards Status
Pending
Contracts Status
Not Specified

Buyer & Supplier

Contracting Authority (Buyer)

Main Buyer
UK Health Security Agency
Contact Name
Available with D3 Tenders Premium →
Contact Email
Available with D3 Tenders Premium →
Contact Phone
Available with D3 Tenders Premium →

Buyer Location

Locality
LONDON
Postcode
E14 4PU
Postcode Area
East London
Country
England
Major Region (ITL 1)
TLI London
Basic Region (ITL 2)
TLI4 Inner London - East
Small Region (ITL 3)
TLI42 Tower Hamlets
Delivery Location
Not specified
Local Authority
Tower Hamlets
Electoral Ward
Canary Wharf
Westminster Constituency
Poplar and Limehouse

Supplier Information

Number of Suppliers
1
Supplier Name

LIMBURN BOILER and HEATING SERVICES LIMITED

Further Information

Notice Documents

Open Contracting Data Standard (OCDS)

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The Open Contracting Data Standard (OCDS) is a framework designed to increase transparency and access to public procurement data in the public sector. It is widely used by governments and organisations worldwide to report on procurement processes and contracts.

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