Insulation

The most important thing of a building and any extention or alteration is to insulatate.

It's really quite easy to do:

Spray small openings and/or odd ones with builders foam. (be careful not to get it on your clothes though... it's horrible!)



Then evenly space small wooden bars - ideally so, that you can cover them with plasterboard without trouble.



Stuff the insulation between the bars.



I will have to restore the electrical wiring before I close up with plasterboard - but that's optional!