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A483/A489 Newtown Bypass

Client Corderoy | Welsh Government
Project Value £100m
Status Complete - open for traffic

The A483/A489 trunk roads at Newtown form part of the north-south and east-west transport corridors linking areas such as Mid Wales and the West Midlands. Newtown was a pinch point on the network and the junction of the A483(T) and A489(T) regularly suffered from traffic congestion. Further industrial development of Newtown was hampered by transport and congestion issues.


The project is one of the largest ever to be delivered in mid-Wales and entailed the construction of a new bypass around the southern edge of Newtown that crosses the Cambrian Railway and involves the bridging of several valleys and culverting a number of significant water courses that feed into the River Severn.


The highly complex scheme aimed to deliver several transport planning objectives such as maintaining the economic base of the town and reducing air pollution in the town centre. The A483 / A489 Newtown Bypass consists of;

  • 5m3 tonnes of earthworks and extensive ground improvement works;
  • New 6.1km 2+1 carriageway;
  • 1km of new side roads on the side of the Severn Valley;
  • Five new roundabouts providing connectivity to existing roads and improved access to the three main industrial areas in Newtown;
  • 4 underpasses creating connectivity for land severed by the Bypass;
  • Four underbridges taking the Bypass over existing features (one a railway crossing, one a 90m long, three span structure);
  • 7 attenuation ponds;
  • 3 overbridges taking existing roads over the Bypass.


Welsh Government appointed an integrated Corderoy/Capita client-side Employer’s Agent team in 2012. Following which the team worked in true collaboration with Welsh Government to develop the £100m scheme through Procurement to Contract Award, Public Inquiry, Detailed Design, Construction and Handover.


Capita provided multi-disciplinary technical advisory services, including;

  • Engineering; highways, drainage, structures, road safety, traffic signage and road markings and geotechnical as ‘Overseeing Organisation’s Geotechnical Advisor’;
  • Environmental;
  • Land and orders; line order/ side roads order/ compulsory purchase order.


Specialists provided ongoing technical advisory throughout all key stages of delivery and co-ordination of technical issues between the designer and contractor and on-site supervision, recording changes and managing them to ensure no delay to the construction programme.


Our role also included acting as NEC Supervisor to principal contractor Alun Griffiths, liaising closely with all key stakeholders and affected parties to help reduce impacts and ease the construction phase through to handover and aftercare.


“Thanks for managing what is a complex scheme with confidence and calmness – our patience was sorely tested this year, but you handled it all with great professionalism and without bringing Welsh Government into disrepute – something I am sure a few Newtown Residents would have been keen to promote. Thanks again”

Peris Jones, Project Director, Welsh Government


Creating better outcomes

The Newtown Bypass now reduces traffic volumes through the town leading to reduced journey times in the area and better access to jobs and services. Construction has been completed to the highest standard and strong emphasis has been placed on providing local employment opportunities which has delivered a boost to the local economy.


Around 17,000 vehicles now drive on the bypass every day, significantly reducing the traffic moving through the gridlocked town by 50%. 90% of large high-sided HGV’s and agricultural vehicles previously causing major congestion and air quality issues through the centre now use the bypass.


“I am delighted to officially open what is a significant development in Mid Wales. The Newtown Bypass has been delivered ahead of schedule and completed to the very highest standard. The scheme improves north-south and east-west links and will provide a real step change in how people travel in the area as well as to and beyond Newtown. The amount of traffic passing through the town will reduce as a result of the development leading to shorter journey times and improved air quality in the area.


“The new bypass will strengthen the local economy by making it easier and better for people to access jobs and services and businesses will benefit too as the new route makes it simpler to import and export goods. It also provides improved links to tourist destinations which will be a boost for the industry. I have been impressed with the role apprentices and graduate trainees have had working on the construction of the bypass. I’d like to congratulate them, Alun Griffiths and everyone who has worked on delivering this excellent feat of engineering.”

Ken Skates, Welsh Government Economy and Transport Minister


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