Because the house and plaster is still drying out, if you wallpaper and the house moves or settles it will crack the wallpaper, the wallpaper may also just peel off and the wall drys out.
I bought a new build 2 years ago when the estate was first put up, a mid terraced 2 bed cost me £169,000, the current 2 bed mid terraced being sold now as the estate is finished are selling for £195,000.
We have also done things like boarding the loft and made the garden low maintenance which...