Sachakins
The most wasted of days is one without woodwork
I have fitted double bifolds uPVC With oak style finish on outside and white inside on a wooden Lodge before and the sound and heat insulation the provided is fantastic.I'm into wood and anyway want heavy doors for sound proofing and security.
Wouldn't do it again on my own, weight crucified me, even without the glass in.
I was pretty impressed with them.
But not cheap option though.