Hi All

The construction around the front facing windows of our home has 3 windows which, internally, are "inset" into the front elevation.

Typically the front stonework is approx 450 mm thick, but where the windows sit the stonework is approx 200 mm thick and very cold with it.

I intend to flush the walls off with a small studwork partition, in line with the thicker parts (450mm) so that the bay, if that's what its called is removed.

My question is, what should I use to insulate the newly created void ?

I'll use cls timber for the stud and probably cap them off to form the windowsill with u pvc or timber sills.

Is this a good form of insulating works or are there other methods I should consider ?

Thanks

Dave