When it comes to home improvements that impact upon systems in the home, such as plumbing, heating or electricity, it may be best to hire a professional, it has been claimed.According to the National Home Improvement Council (NHIC), some jobs require certification that could be needed when selling a property.While installing a new kitchen sink may be a relatively simple task for those in the know, other projects may require specialists.Andrew Leech, director at the NHIC, says details of improvements could be important when trying to sell a property.He explained [A solicitor] may also ask for certificates to show that you have made these improvements if you havent got certificates, then you wont sell the house.DIY enthusiasts embarking on new projects need to ensure they are quite competent when undertaking tasks.Research from MyHammer has revealed that 60 per cent of homeowners in the UK are planning home improvement projects this year.Over a third of those polled plan to fit a new bathroom or kitchen, which could boost sales of kitchen sinks and sink accessories.