People are also 'having a go' at tasks best left to the professionals such as adding extra lights and re-wiring, the study from the Electrical Safety Council (ESC) found.
It surveyed consumers and electricians and found that almost half of all severe electric shocks are caused by DIY attempts, with people confessing to such errors as cutting through power leads, drilling into wiring in walls and repairing electrical items that are switched on.
Electricians say they are spending an increasing amount of time repairing such blunders and are concerned that 'dive-in DIYers' are endangering themselves and their families.
Phil Buckle, director general of the Electrical Safety Council, said: "As budgets continue to be stretched, many people will look for the easy solution but this can often be more costly in the long term and can also pose severe risks.
"There is a lot of good advice out there on how to go about tasks safely, but you must make sure the advice you take is reputable.
"For the small tasks that you are not sure of and for all the major jobs, my message is DDIY - Don't Do It Yourself."
Some 47% of people surveyed by the ESC accept DIY advice from unqualified friends or family, 42% of respondents say they use Google and 39% use online video tutorials, such as on YouTube.
The charity suggests finding a registered electrician through the Electrical Safety Register.
TV personality Andy Kane, aka Handy Andy, is supporting the ESC's call for safety. He said: "I'm well known for my DIY skills and love getting stuck into a good project. But when it comes to electrical DIY I always get professional advice and help. I don't think it's unmanly to want peace of mind for yourself and your family."