for additional works, supplies or services by the original contractor that have become necessary and that were not included in the initial procurement, where the following conditions are fulfilled:
maidir le hoibreacha, soláthairtí nó seirbhísí breise á ndéanamh ag an gconraitheoir bunaidh a bhfuil gá leo anois agus nár cuireadh san áireamh sa chéad soláthar, i gcás ina gcomhlíontar na coinníollacha seo a leanas: