Fekin

You only charge V.A.T if your V.A.T registered.

As to how you charge for your labour then that's entirely upto you.

How much do you need to earn a day ?

Some price up by the sqm if it's a big job, some, like most maybe look at a job and work out a price for what evers involved.

There is no set way of pricing up a job as their all different.