Transport for NSW calls for builders on the $940 million Milton Ulladulla bypass

Transport for NSW is looking for the contractor to build the Milton Ulladulla bypass, a new 12-kilometre section of the Princes Highway that will take through traffic around the Milton and Ulladulla town centres. Expressions of interest (EOIs) for the Design and Construct contract opened on 21 August and close at 3pm on Thursday 15 October.

The Australian and NSW governments have committed $940 million to the project. It leads a group of NSW road projects moving forward this spring, alongside the Bandon Road and Windsor Road upgrades in Sydney's growing North West.

Project at a glance

How the procurement works

A Design and Construct (D&C) contract puts both the detailed design and the build with one contractor. Transport is running it in two phases: applicants submit an EOI, a shortlist is chosen, and the shortlisted teams are invited to tender.

EOI documents are held in a project data room. Interested firms gain access by signing and returning a corporate confidentiality deed to the procurement team, as set out in the EOI notice on buy.nsw. Transport has said it is considering bid cost contributions, though these are not guaranteed. The successful contractor must also be accredited under the Australian Government's Work Health and Safety Accreditation Scheme.

What will be built

The concept design has three connections to the existing highway:

• Northern connection: a four-leg roundabout joining Little Forest Road, the Princes Highway and the bypass
• Central connection: a grade-separated interchange linked to the highway by a new extension of Bishop Drive, giving access to Ulladulla, Mollymook and Narrawallee
• Southern connection: a three-leg roundabout near Canberra Crescent at Burrill Lake

The design also includes ten new bridges or large culverts over creeks and local roads, walking and bike riding links, fauna crossings and noise walls. Most of the route will carry a 100 km/h speed limit.

Transport expects the bypass to make daily commutes up to nine minutes quicker than driving the existing highway, and up to 48 minutes quicker during the busiest holiday periods.

Also moving: Bandon Road and Windsor Road

Bandon Road, Riverstone to Vineyard. Gamuda Engineering and Seymour Whyte Constructions have been shortlisted for Sections 3 and 4 of the Bandon Road Upgrade and Extension in Sydney's North West. Transport published the shortlist on 11 August after evaluating six EOIs.

The two teams now move into the Design and Constructability Early Contractor Involvement (ECI) phase, where each tenderer works through its design and construction approach with Transport in one-on-one sessions. A pricing phase follows, after which Transport will select the contractor.

Sections 3 and 4 cover the corridor between Riverstone West Spine Road and Windsor Road at Vineyard. The scope includes a four-lane divided road with room to widen to six lanes, a grade-separated crossing of the Richmond railway line at Vineyard to replace the existing level crossing, a pedestrian bridge, a shared path and upgrades to the flood evacuation route. In July the NSW Government announced an extra $250 million to fast-track major construction on the corridor's priority eastern section, which is expected to start by September 2027.

Windsor Road, Rouse Hill. The Australian and NSW governments have each committed $200 million to the $400 million Windsor Road Upgrade at Rouse Hill. The proposed features include widening Windsor Road to three lanes plus a bus lane in each direction between Mile End Road and Commercial Road, upgrading four intersections and building a shared path along the eastern side. The project will also provide access to the new Rouse Hill Hospital, which Health Infrastructure and Western Sydney Local Health District are building on the corner of Commercial Road and Windsor Road. Transport is in early planning and design, with site investigations along Windsor Road and Commercial Road scheduled to run until the end of October.

What's next

For Milton Ulladulla, the next milestone for industry is the 15 October EOI close, followed by the selection of a shortlist to tender. The project's Environmental Impact Statement (EIS) is also on public exhibition until midnight on 19 October 2026 through the NSW Planning Portal. Community drop-in sessions are scheduled for 11, 13 and 14 October in Ulladulla and Milton. Transport expects to publish its response to submissions in early to mid-2027, with planning approval to follow.

On Bandon Road, Gamuda and Seymour Whyte will work through the Design and Constructability phase ahead of pricing. Windsor Road will move forward as Transport's design and planning progress.

Published 4 October 2026 · Updated 2 October 2026