Planning, Development and Infrastructure Act 2016

The expense of building a party wall, or carrying out any work in relation to a party wall, is to be borne in due proportion by the adjoining owners, having regard to the use that each owner is to make of the party wall.

The building owner must, within 28 days after the completion of any work in respect of which a contribution is payable by the adjoining owner, serve on the adjoining owner in accordance with the regulations an account showing the cost of the building work and the proportion of that cost that the building owner claims to be payable by the adjoining owner.

If after the expiration of 28 days from the service of the account the account remains unpaid, the building owner may, by action in any court of competent jurisdiction, seek a determination of the amount payable to him or her by the adjoining owner, and recover that amount as a debt.