Frequently asked questions about Didcot infrastructure improvements
Why is the scheme needed?
The scheme will provide vital transport infrastructure to reduce congestion and enable more reliable journey times, improve pedestrian and cycling connectivity, and support new employment sites and housing. It is currently expected that the project will directly unlock 11,711 new homes and support the delivery of more than 17,000 new homes in total in the Didcot Garden Town area. These future residential areas are located across 12 separate sites in and around Didcot in South Oxfordshire (SODC) and Vale of White Horse (VoWHDC) districts.
How much funding has been secured?
The £332 million project is fully funded. Successful discussions with government in 2022 , and again in 2024 , resulted in additional grants from Homes England. Approval was also given to underwrite up to £30m from Oxfordshire County Council’s capital budget in February 2022, while Oxfordshire Local Enterprise Partnership contributed a £10m capital investment generated from Enterprise Zones’ business rates retention.
What is the overall programme of works?
The planning application was submitted in November 2021.
Following a conjoined planning and Orders (compulsory purchase order, side roads order and bridge scheme) Public Inquiry which took place between February and May 2024, planning approval for the scheme was granted by the Secretary of State for Housing, Communities and Local Government in December 2024.
The Side road order (SRO) and compulsory purchase order (CPO) needed to secure all of the land for the scheme were confirmed by the Secretary of State for Transport in July 2025.
Recordings of the sessions and core documents relating to the Inquiry can be found on the official inquiry portal.
Construction is anticipated to start on site in early 2026 and last approximately two years.
How is the land being obtained for the scheme?
Every effort is being made to acquire the necessary land and new rights by private agreement.
If we can't reach an agreement, we now have the legal ability to use compulsory purchase powers to buy the land or other rights we need. These powers can be used until 29 July 2028.
Using the CPO is a last resort, wherever possible. We are continuing to negotiate with affected parties and other key stakeholders.
What are the speed limits of the four elements?
- A4130 Widening: 40mph
- Science Bridge: 30mph
- Didcot to Culham River Crossing: 30mph at the southern end, 50mph elsewhere
- Clifton Hampden Bypass: 40mph at the southern end at the new roundabout, 50mph elsewhere
What about the impact on wildlife and the environment?
An Environmental Impact Assessment (EIA) has been carried out to ensure any impacts on the environment, wildlife and ecology are properly investigated and mitigated or avoided where possible in accordance with the applicable legislation. The EIA also includes the impact on the historic environment, an Air Quality Impact Assessment and Noise Impact Assessment. As part of the landscaping strategy, there is the potential for planting alongside some sections of the schemes.
Will construction traffic cause traffic disruption in Didcot?
There will be some disruption during construction, but through the implementation of a Construction Traffic Management Plan this disruption will be minimised wherever possible.
The construction of the four elements will also be carefully phased in order to avoid, where possible, works taking place simultaneously in multiple locations on the existing highway network. Residents will be informed of traffic management arrangements closer to construction. During construction, residents and businesses can also check live road works on One Network.
What type of pedestrian and cycle crossings will there be across the scheme?
The type of each pedestrian and cycle crossing depends on the nature of the environment, the anticipated usage, and the proposed speed limit in each location.
The next stages of design will further consider the appropriateness of each type of crossing, taking into account the comments received from the planning application, and further Road Safety Audits.
How can I find out more?
If you have any specific questions about the overall programme or its individual elements, please contact the delivery team at HIF1project@oxfordshire.gov.uk