My questions are:
1) Are there any affordable houses in Japan? depends what you mean by affordable. I had an expat from the US tell me that the price of homes in his area was less than the average for San Francisco, which he quoted as 350,000 USD. Expect to pay that much or more for something quite small is a big city, but that same amount will get you a nicer home further out int he country.
2) Is it possible to buy a house without having to pay money back your whole life if you have a average salary job or a bit higher. this is between you and the bank. Of course if you have a high paying job (we are talking low level executive) you won't spend the rest of your life in debt.
3) What does the average house look like in Japan? Do you have a link with some pictures of it? Took a bit of work to find this picture. No one wants to take pictures of the normal house, because most of the normal houses in all honesty do not look good. They are surrounded by other houses built on on top of the other, and there are always powerlines running around. Since the average modern house is mainly built of plastic, houses are not all that remarkable. See the attached photo though if you wish.
4) What does the average house block look like? Do you have some pictures to show of that also? think of a group of houses like the one in the photo are right next to each other and using up all the avalible land. Often windows will look directly into or onto the neighbors house and everything is very crowded
5) What percentage of the cities buildup in Japan on the average has house blocks? More than most sane city planners would allow, since the concept of city planning seems to be nonexistant here
6) If you buy a affordable house do you almost always have to travel to work 1 hour or more? Depends where you live, but your guess is about right. I would even hazard that you would have to commute even longer
7) In what areas are the most affordable houses in Japan that are near cities and not in the middle of nowhere?anything incovenient to most anything else For sure, stay away from places like Tokyo and Osaka. Any major city is going to be pricey, but land prices further from the economic and industrial centers tend to be lower - out in places like Hokkaido, the Sea of Japan side of Honshu, most all of Shikoku and parts of Kyushu.
*Or is Japan mostly built full with apartments and flats, skyscrapers? since this tends to be the most affordable option in big cities if you don't have the cash and don't want a home that is going to lose its value in about 15 to 20 years, then apartments are the way to go.
Part of the problem with Japanese housing is that the organizations in charge of building and building materials severly limit foreign products, which are almost always better, cheaper, and look better. Prices are kept artificially high and while while quite flashy with lost of bells and whistles, they tend not to last. In my house I can think of maybe 8 major household items (like a bookshelf) not made of plastic made to look like wood. One of them is my cutting board.
Energy-wise, Japanese houses tend to be very inefficent when it comes to heating and cooling, and most walls lack good insulation - again, this is all because of the construction interests like JIS
Not saying you shouldn't give up buying a home in Japan, but just be aware of what your money is getting you.