Scope
Reference
HE0915 M4 Junction 17 Improvement Works
Description
Wiltshire Council are procuring a contract for the delivery of the M4 Junction 17 improvement works, with a view to awarding the contract in early spring 2026. Scope of Works The proposed scheme includes: • Installation of traffic signals on all roundabout approaches • Carriageway widening throughout the junction • Increasing the number of traffic lanes across the motorway bridges from two to three • Widening of the circulatory carriageway The successful contractor must be capable of working on the National Highways network and experienced in delivering complex highway infrastructure improvements. Delivery Phases (estimated) The contract will be delivered in two phases: • Phase 1 - Early Contractor Involvement (ECI): Spring 2026 - Autumn 2026 • Phase 2 - Construction: 2027 (subject to approval of the Full Business Case by the Department for Transport) Estimated Value • £24 million (including VAT)
Total value (estimated)
- £20,000,000 excluding VAT
- £24,000,000 including VAT
Above the relevant threshold
Contract dates (estimated)
- 3 February 2026 to 28 August 2028
- 2 years, 6 months, 26 days
Main procurement category
Works
CPV classifications
- 45233000 - Construction, foundation and surface works for highways, roads
- 71311000 - Civil engineering consultancy services
Contract locations
- UKK15 - Wiltshire CC
Engagement
Engagement deadline
12 August 2025
Engagement process description
Wiltshire Council - M4 Junction 17 Improvement Works
Market Engagement Event Invitation
Wiltshire Council is hosting a market engagement event ahead of procuring a contract for the delivery of the M4 Junction 17 improvement works, with a view to awarding the contract in early spring 2026.
Scope of Works
The proposed scheme includes:
• Installation of traffic signals on all roundabout approaches
• Carriageway widening throughout the junction
• Increasing the number of traffic lanes across the motorway bridges from two to three
• Widening of the circulatory carriageway
The successful contractor must be capable of working on the National Highways network and experienced in delivering complex highway infrastructure improvements.
Delivery Phases (estimated)
The contract will be delivered in two phases:
• Phase 1 - Early Contractor Involvement (ECI): Spring 2026 - Autumn 2026
• Phase 2 - Construction: 2027 (subject to approval of the Full Business Case by the Department for Transport)
Estimated Value
• £24 million (including VAT)
Market Engagement Event Details
This online engagement session will provide an overview of the project, procurement route, and key requirements for interested contractors.
• Date: Tuesday 12th August 2025
• Time: 11:00am - 12:00 noon
• Location: Microsoft Teams (link provided upon registration)
To register your interest and receive the joining link, please contact: jack.francis@wiltshire.gov.uk
Further Information
For additional background about the project please visit: Junction 17 - M4 - Wiltshire Council
Participation
Particular suitability
Small and medium-sized enterprises (SME)
Submission
Publication date of tender notice (estimated)
18 September 2025
Contracting authority
Wiltshire Council
- Public Procurement Organisation Number: PDZR-9968-RYYY
County Hall
Trowbridge
BA14 8JN
United Kingdom
Contact name: Ms Rachel Candy
Email: rachel.candy@wiltshire.gov.uk
Website: http://www.wiltshire.gov.uk/
Region: UKK15 - Wiltshire CC
Organisation type: Public authority - sub-central government