The cost of your injunction will depend on the type of order and whether solicitor fees are applicable. An injunction application is free in most cases and always when related to domestic abuse, but you may need a solicitor to represent you in court or to push through an emergency order, which can cost thousands depending on their rates. Court fees start at £308.
You may be entitled to Legal Aid to cover the cost, or a charity such as Women’s Aid or Citizen’s Advice may be able to assist you with the fees.