After moving to Germany, I was blown away by the property prices (relative to comparable buildings internationally) and the building materials.
This is a typical German door, with a bevel: http://higherlogicdownload.s3.amazonaws.com/AIA/UploadedImag...
Typically these have a matching rubber seal, which dramatically reduces noise and draughts: https://www.modern-doors.co.uk/blog/wp-content/uploads/2014/...
Additionally the apartment walls are like a bunker, which means you don't hear traffic, trains or your neighbours even if you live in a city centre.
I had a look at these doors as I was intruiged and beguiled by them. They always felt substantial and well-engineered to me. I found that one typically buys a 'door set' which includes a frame and door which have been made to work, lock, seal etc together. You can then fix the door set into your building. In the UK this is not typically the case, I don't know about the states or elsewhere.
The systems for tiling are also wonderful and exported throughout the world (see Schluter). There is a trend of concealing toilet cisterns by companies such as Gerberit, although I hear these aren't as reliable as the doors. I'm still on the lookout for more of these systems (I can see there's a standard for residential electric circuit breakers, I haven't got to the bottom of those yet). I love how well thought-out they are.
http://www.dailymotion.com/video/xx0k9r_se04e06-grand-design...
I'm surprised to hear those heavy duty doors are not available internationally, they utterly destroy any interior door in terms of quality that I was familiar with growing up.
I can tell you that you can throw a full blown house party without the neighbours hearing a peep, and you almost never use the heating if you live a few floors up (a few days per year at most due to the completely sealed building and the rising heat from downstairs neighbours).
I found that there were suppliers of the doors in the UK but I haven't looked further afield. The windows (opening two different directions) are also similarly impressive though much more widespread. I spend half my time in Germany trying to look out for these things and marvelling at them.
The nice thing is, you can easily hoover and mop under the cistern very quickly, instead of dust gathering behind it like with a typical toilet. It's a simple, unassuming design too, does just the job and stays out of the way otherwise.
Other details that I've noticed is every single door, inside and out, has that bevel/seal combination I mentioned, and not just in higher-end building like offices either but also regular apartments.
The doors - yes. With beautiful solidity. I had a look and possibly Grauthoff is a name of one manufacturer. When I was last in Berlin I kept looking for labels or manufacturer marks but I couldn't find any. I daresay someone in construction in Germany would immediately know.
Any chance that stuff (doors and whatnot) is available for sale in or to the US? I'm in a crazy noisy American city with 19th century levels of noise isolation (literally).
Failing that, some of the major German "baumarkt" (building supplies stores) chains:
http://www.hornbach.com/de/index.html
http://www.obi.de/decom/home.html
Use google translate and see what you get. It might be worth investigating the pricing on a shipping container if you have an upcoming renovation or build in mind, shipping is cheap these days due to the global supply glut. If you have a friend who wants to do a project, a 40 foot container will cost you the same whether it's 10% or 100% full so you split the cost (weight doesn't matter). Try a shipping forwarder to the US or maybe you know someone in Germany and order to their address, and forward it.
Our German friend constantly remarks about how terrible the roads are here. And not even like roads that I'd consider bad (I-95 in New Jersey). Ones like GW Parkway that I thought were pretty good.
How can I learn more about this stuff?
For example, anecdotally, a major reason for Germans to oppose TTIP is that we're concerned about our standards in consumer and health protection and build quality. U.S. standards are perceived to be much lower (although the reality is of course not always like that).
https://ec.europa.eu/energy/en/topics/energy-efficiency/buil...
You can be sure Germany had a primary role in establishing these standards.
Not really expensive if you are only considering sleep.
http://www.howardleight.com/earplugs/laser-lite
I buy them by the 200 count for about $30, works out to $0.15 per pair. I started using these for motorcycling years ago then woodwork and blacksmithing or any time I use loud machines. For sleeping I use them a couple of times before throwing them away, for other activities they're single use.
I also run a fan in my bedroom and have a cheap ($20) white-noise generator for use with a baby that I can use when traveling.