Aside from the chance to blow the dust off their treasured power tools, the key reason people take on DIY projects around the home is to save on residential building work costs.

Unfortunately, without the right skills, knowledge and preparation DIY can actually end up costing more than hiring a professional – with Local Heros estimating Brits spend up to £34 billion (yes billion) each year, fixing bad DIY jobs.

Now whilst a botched job on the garden fence won’t damage much more than your pride, there are some DIY mistakes that can end up costing you hundreds in remedial work – here are 4 costly DIY mistakes and how to avoid them.