In a leaflet issued to local residents SGN state:
"We are investing £150, 000 to upgrade the gas network in High Street in Nairn.
This essential work involves the replacement of old, metal gas mains with new plastic pipe to ensure a continued safe and reliable gas supply.
Following discussions with the Highland Council, the work will start on Monday 7 September and will take approximately 21 weeks to complete"
You can see how the work will be phased and how long each section will take on a copy of the information leaflet in PDF format here.