An average undefended divorce will cost in the region of £600 plus vat for the solicitor to deal with it on your behalf. In addition there is a court fee of £550 to start the proceedings. Other cases can be more complicated, for example where there is an international element to them or the other party fails to cooperate. In addition, if there are any other issues, for example, in relation to the finances or the children then the costs are likely to be more. A family lawyer should be able to give a best estimate of costs on a case by case basis and as the case progresses.