We plaster a lot of house extensions, from the bare shell we will fix all the plasterboard in place and skim the whole thing. 

Many people make the mistake of using an inexperienced builder to do the plastering.

Even if they are great at the rest of the work they do on your property, plastering is an absolute specialist trade.

We would not recommend using anyone less than the best for this if you want an A1 perfect finish.