Whitburn's new Partnership Centre will bring a number of local facilities and services under one roof in the heart of the town centre.
The original Burgh Halls façade will also be kept and restored.
The project is the latest in the council's partnership centre model that has proven successful in other parts of the area including Armadale, Bathgate, East Calder, Broxburn, Fauldhouse and Linlithgow.
West Lothian Council will invest nearly £5 million in the facility which will see the redevelopment of the Burgh Halls on East Main Street to create a centre.
A new two-storey extension is being constructed to the retained East Mains Street building which will provide a new easily accessible main entrance leading in to an airy reception area with seating. The redeveloped building will provide accommodation for the Library, Housing Office, Access 2 Employment, Customer Information Service and Museum as well as providing two community rooms, separated by a sliding folding partition which can be opened up to form one large Community Hall.
A kitchen is also being installed with a servery which opens in to the larger of the two community spaces. The ground floor also provides public toilets, an accessible WC and a baby change within an extra unisex WC. The upper floor houses additional office space and meeting rooms with staff WCs.
Central Building Contractors have been appointed to carry out the works and existing local facilities will continue to operate, with the new facility expected to open late 2020.
Depute Council leader Kirsteen Sullivan said: "This is a significant investment in the town and the new building better meets the needs of customers by hosting a wider variety of services under one roof as well as providing new spaces for the local community. There is a lot of work to be done and we are delighted that the project is now underway. I am sure that the investment in this new facility in Whitburn will prove extremely popular once it opens."
Ann Marie Carr, Acting head of housing, customer and building services added: "Our Partnership Centres have proved very successful in other towns and we have high hopes for the new Centre in Whitburn which is really about creating a new, modern facility that delivers a range of services under one roof. In other locations we've seen an increase in the numbers of visitors to libraries within Partnership Centres so we know this model of service delivery works well."