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A483 Newtown bypass

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We are building a bypass to the south of Newtown, connecting the A489 and A483 while avoiding Newtown.

Traffic updates

You can find out about local traffic disruptions due to this project on the Powys County Council website (external link). Information about disruptions on our trunk roads can be found on the Traffic Wales website (external link).


Project status: under construction
Region: mid Wales
End date: late 2018
Employers agent: Corderoy
ECI contractors: Alun Griffiths (Contractors) Ltd
Designer: Atkins, TACP

Why we are doing it

The junction joining the A483 and A489 is regularly congested. We believe that industrial development of Newtown is hampered by congestion issues, and so improving transport will help industry grow in this area.

Current progress

We announced our preferred route for a bypass in October 2010. We modified this route in March 2014 following consultation. In February 2016, following a public local inquiry we announced that we will build the bypass.

Our contractors are currently designing and constructing the bypass. We began site clearance in March 2016 and have started earthworks for the western roundabout on Llanidloes Road. We are also building a temporary road diversion on Upper Dolfor Road to allow us to build one of the larger bridges for the new bypass.

The plan

We are building a 6.53km bypass to the south of Newtown. The route will:

  • begin at a new roundabout on the A489 Llanidloes Road west of Newtown
  • cross over Mochdre Brook and run south of the Mochdre Industrial Estate
  • connect to the A483 Dolfor Road at a roundabout, which would also link to the Mochdre Industrial Estate
  • cross agricultural land to the A489 Kerry Road junction
  • continue south of the Vastre and Dyffryn Industrial Estates then cross the Cambrian railway
  • end at a roundabout on the A483 Pool Road east of Newtown.

The new road will have a 2+1 carriageway allowing safe overtaking in both directions.

The scheme also includes some de-trunking works along Pool Road and New Road in Newtown.

The design will endeavour to avoid or minimise impact from the following constraints:

  • relict landslip areas
  • major utilities
  • known and predicted ecology
  • known and predicted archaeology
  • flood risk areas
  • air quality management area
  • Cambrian railway
  • rights of way and accessibility issues.

How we consulted

Our consultants held a public consultation exhibition between 8 and 10 September 2009 in Newtown.

Proposals incorporating the 2010 preferred route plus alternative options were displayed at a public information exhibition on 9 July 2013, which resulted in a modified preferred route being announced in March 2014. This route was viewed by over 600 people at another public information exhibition on 8 April 2014.

In June/July 2015 there was a public local inquiry.

Alun Griffiths have a site office on the the A483 Dolfor Road, open during normal business hours. Directions to Newtown Bypass Site offices are available below. For appointments outside of these hours you can contact the project manager Nick Cleary or on 01686 806682. For further information on the scheme contact Alun Griffiths (Contracting) Ltd.

For further information on the scheme contact Alun Griffiths (Contracting) Ltd.