Galliford Try and Breheny Civil Engineering have secured contracts to deliver major off-site infrastructure works for the Sizewell C nuclear power station.
The road packages include a £100m-plus scheme to build the 6.5km Sizewell Link Road and the 1.8km Two Village Bypass, awarded to Galliford Try, and a contract to construct two roundabouts on the A12, let to Needham-Market-based Breheny.
The Sizewell Link Road is due to complete in 2027. It will bypass the villages of Theberton and Middleton Moor and link to the existing road network through newly built junctions.
The Two Village Bypass will route traffic around Farnham and Stratford St Andrew, and is expected to finish by the end of 2026.
These awards follow a previous deal with Jackson Civil Engineering for other road schemes.
Sizewell C said it expects to deliver 60 per cent of materials to site by sea or rail to minimise road use.
A trial of hydrogen-powered buses for worker transport is also underway.
The roundabout package marks a return for Breheny to Sizewell, having worked on Sizewell B in the 1980s and undertaken several preparatory schemes on the new project.
Breheny employs in-house construction teams and delivers civil engineering works across East Anglia, the Midlands, and Yorkshire.
Sizewell C site delivery director Damian Leydon said the new roads would help limit construction traffic and reduce disruption in Suffolk.
The power station, a 3.2GW twin-reactor project on the Suffolk coast, is expected to generate 70,000 jobs across the UK and spend £4.4bn in the East of England during construction.
To date, 300 contracts worth £2.5bn have been let to British firms, with a third of the 7,900-strong peak workforce set to be sourced locally.
The project has also pledged to create 1,500 apprenticeships, with 60 already in place.
Source: Sizewell C press release