Signs have gone up giving advance notice of roadworks in New Town, Uckfield, that could take six weeks to complete.
The works are described on the East Sussex County Council website as “high impact, delays likely”.
Southern Gas are to replace 30m of mains pipe, renewing two service and making three mains.
The work is scheduled to begin on Monday (February 23) with completion expected by March 20. It will take place between 70 High Street, home of Magnet and Saffron and Sycamore, and number 66, on the carriageway, footway and verge.
Multi-way traffic signals will be in place.