Mistakes with DIY work on features such as kitchen sinks costs British homeowners 2.1 billion per year, it has been discovered.More than 24 per cent of people have had a DIY disaster in the last year, with each one having an average repair cost of 145, while 42 per cent of residents claimed that they should have hired a tradesman before embarking on improvement work, MyHammer.co.uk has found.Gerrit Mueller, chief executive officer of the website, said If you are not terribly skilled it can be more cost effective to pay for work to be done to be sure of a professional job and save money in the long run rather than righting DIY disasters.In addition, the survey found that 60 per cent of homeowners tackling DIY work want to consider the advice of people who have completed renovations themselves.MyHammer.co.uk previously advised homeowners to consult professionals when carrying out improvement work.