The agency will work with OnePlusOne, after teaming up with the charity to win a brief put out to tender by the Department for Education (DfE).
The campaign aims to encourage couples to regard accessing relationship support as a normal thing to do to strengthen their relationship, rather than something sought at crisis point.
The campaign is part of a two-year contract and a wider drive by the DfE to provide support to 2.5 million families up to 2015. As part of that, organisations from the voluntary and community sector have been bidding for £15m of funding to encourage stronger relationships.
Claremont has hired Nancy Platts, an expert in children and family policy. She has previously worked at senior level for Daycare Trust, the Maternity Alliance, National Childbirth Trust and Child Poverty Action Group.
Platts will develop a campaign targeted at new parents, young people and employers that aims to engage the public and intermediaries such as parenting organisations and housing associations.