Delivering Civil Engineering
And Construction Projects

Meeting Deadlines. Maintaining Quality. Solving Problems.

Delivering Civil Engineering
And Construction Projects

P1 Construction

Civil Engineering and Construction Solutions

P1 Construction delivers civil engineering and construction projects across the UK.

We support projects from initial consultancy and early-stage planning, or work with client-provided designs, through to construction, commissioning and final handover.

Projects range from smaller works through to those exceeding £10 million, under a variety of contract models including traditional, design and build, and full turnkey delivery.

Our team is known for meeting tight deadlines, maintaining quality, prioritising safety, and responding quickly to challenges on site.

‘What struck me was the unwavering commitment to safety’

Gary Porter

Porterbrook

Core Services

Highly focused, solutions-driven, bespoke service

Civil engineering and construction
Road Construction
Design and build industrial / work space structures
General building works
Bulk earthworks
Rail infrastructure
View all services

Porterbrook Underpass Project

Long Marston Rail Innovation Centre – September to December 2025

  • Multi-lane underpass constructed to replace existing level crossing.

  • Over 100,000m³ of earth excavated within two weeks.

  • 25 metre pre-cast concrete sections installed within five days.

  • Critical access achieved by 21st October to maintain the railway programme.

  • Full underpass and associated works completed by December 2025.

‘P1 are fantastically agile – they can respond to most situations dynamically’

Luke Binner

Siemens

‘What struck me was the unwavering commitment to safety’

Gary Porter

Porterbrook

Porterbrook Underpass Project – Long Marston Rail Innovation Centre

September 2025 – December 2025

Porterbrook commissioned P1 Construction to deliver works at their Long Marston site as part of the ongoing modernisation of the Rail Innovation Centre. P1 designed and constructed a multi-lane underpass valued at approximately £6 million, replacing the existing level crossing to improve access to and from the site.

Construction commenced on 8th September 2025, with the underpass required to be handed over by 21st October 2025 to provide access over the structure and facilitate the installation of track and overhead electrification.

Working in challenging weather conditions, P1 completed the bulk excavation within two weeks, moving in excess of 100,000 cubic metres of earth while carrying out extensive watermanagement operations. By 1st October, installation of the pre-cast concrete sections had begun, with the main structure completed within just five days – exactly four weeks from commencement of excavation.

Upon completion of the main structure, the team carried out backfilling and prepared the formation, including placement of the railway bottom ballast, enabling handover on programme.

P1 then progressed with the remaining wider underpass works, including drainage, attenuation systems, road construction, and associated structural elements, with the scheme brought fully into use by 20th December 2025.

Additional Works at Long Marston

P1 has delivered multiple packages of work at the Long Marston site.

In 2025, P1 was commissioned to construct a two-storey Depot Control Centre for the train test track. This included delivering a fully completed signalling IT room, required as part of Porterbrook’s commitment to maintain the wider signalling programme. Construction began on 1st August 2025, with the IT facility completed and handed over by 19th September – ensuring the programme remained on schedule.

Following the successful delivery of both the Depot Control Centre and underpass works, P1 was further commissioned to install an innovative GRP rail platform adjacent to the new facility, completed within just 20 days.