My flat at the moment has all the switches at about 1 meter off the floor. Naturally my growing kids are starting to toggle the lighting now that they are tall enough. Is it possible to raise the switches and is it a DIY job? Can you list out the stages I will have to do including making a new hole in the wall etc. etc?
They make various types of "child proof" switch guards, which might be a more practical approach than moving all the switches.
Well....you could install light switch guards such as these:
...that would be used to keep the switch on all the time. Then install remote controlled light socket adapters like these on critical lighting circuits:
You can find many choices for the "remote controlled light switch" by using that phrase as a search string on Google or eBay.
There's really a lot to a job like this. One doesn't know what entails until it's started.
While the work isn't terribly complicated, getting it done (and done right) is not a weekend job for the average diy'er. I mean, we don't know if it's '70s aluminum wiring, the grounding scheme of the house, if the switch was properly wired initially, what kind of switch it is, etc. A person could do the job easily or seriously mess things up, costing them more if they realize their mistakes by calling a pro, or costing them a lot more if they don't by causing a fire.
Yes it can be simple, but if something complicates the move it is just as much work to put the switch back in the original location as it would have been to move it under simple scenarios.
Basically, try your hand at drywall repair before moving light switches. If you get really good at that, then open up the wall knowing you can close it again. What you find behind the drywall is going to tell you if the move is easy. Most of the time such a job isn't difficult, but if you lack the drywall repair skills, it is difficult to even know if moving that switch is easy or not.
--- If it is easy ---
--- If it's not easy ---
You probably opened up the drywall and realized that your wiring doesn't facilitate easy movement of the switch upwards. Perhaps they drilled through studs and ran the wiring sideways or it's coming up from the floor. In any case, you don't have enough existing wire to place the box where you want it.
At this point, seriously consider just skipping to the patch the drywall steps, or hire a professional. The job just grew from moving a box to installing a junction or possibly rewiring that run. You don't want your building to go out of code. A licensed professional carries insurance and is held to a different standard that you are, and that makes all the difference in whether your insurance policy will pay or not should the work create an electrical fire.
A simple move of the box isn't fundamentally changing the electrical wiring, but if you need more wire, the necessary changes are considered beyond the boundaries of simple home repair / maintenance.
You could place a new outlet box and switch above the existing switches and cover the existing switch boxes with a blank plate.
This is better as a comment than an answer, but since it includes pictures, I'll post it as an "alternative" answer.
A possible alternative to raising your light switches, is making something switch-y for your kid(s) to play with. I ran across an electronics kit at Jameco when I was looking for toggle switches and remembered this question on DIY.
I discovered there's a history to the box, which you can find here at GeekDad.
So here is the home-brew version:
And the kit version from Jameco: