Now the roof is in place, all that is needed for the final weather proofing is adding some windows (of the non MS variety)

As per modern building (part L) regulations, these windows are double glazed units with low emisitivity Pilkington "K" glass, and a 20mm argon filled gap. They also have trickle vents for background airflow. The bedroom windows open wide enough to provide a suitable "means of escape" - again as per building regulations.

(again the plans only called for 16mm gap glazing, so we went a little better. It turns out the trickle vents could have also been left off because the windows feature a dual position locking mechanism that lets you shut them with a small gap remaining open)

 

Inside the rear bedroom

The effect outside. The outside finish to the windows is a wood grain effect to match the (real) wood windows in in the rest of the house. This will be revealed later when all the protective white tape is removed from the surfaces at the end of the build!

You may ask why nasty plastic was used when the rest of the house has decent hardwood frames. The answer is they were a third the price, and they are far enough away from the ground you can't really see!