Work planned by the National Grid will disrupt roads across north Watford for 12 months.
The National Grid have a £1.4 million project in which they plan to replace 13km of old gas piping as part of their promise to replace all gas mains within a 30 metre range of buildings.
A spokesperson for the company apologised for any inconvenience caused but said the project was part of the National Grid's ongoing mission to help provide secure energy supplies for future generations.
Roads affected by the closures will include: Biddenham Turn, Bovingdon Crescent, Bridger Close, Bucknalls Lane, Butterwick, Codicote Drive, Colne Way, Cow Lane, Cranfield Drive, Cuffley Avenue, Eastlea Avenue, First Avenue, Gaddesen Crescent, Gadswell Close, Garsmouth Way, Garston Crescent, Gwent Close, Heronslea, Holland Gardens, Holtsmere Close, Kelshall, Kilby Close, Kimpton Place, Kytes Drive, Lemonfield Drive, Mallard Way, Meriden Way, Second Avenue, Spring Gardens, St Albans Road, The Gossamers, The Phillipers, The Turnstones, Westlea Avenue, Whitwell Road, Widgeon Way and York Way.
Sections of the Colne Way footpath will be closing too.
Work will begin in April and is expected to take twelve months to complete.