Willard...by respectable downpayment, I hope you mean 30% of the cost of the house (not including land). Assuming you want a decent sized home (70-80 tsubos for a family of 2) you'll need around $200k for a house, so around $60K for the downpayment. If you need land, it will cost a little more. Many people here rent the land long term (say 20-30 years). I personally don't plan to go that route. I plan to purchase the land and build the house all at the same time! Have your in-laws talk to Tokuzato housing. They specialize in building homes for families like yours. If you shoot me a PM, I'll tell you some more. There are some ways for you to save some money. What area of Okinawa is your wife from? Were you at Torii before?
Doctor P ,I am only going to share my experience with you here so please take it as that. First I will say that I have bought and own a house here in Japan.
I do think that you have underestimated the price of a house by a little bit. If you go off current trends, they( housing companies) do the math by multiplying a "tsubo/坪"(I am explaining like this for the OP BTW) which is about 3.3m/sq or 35 ft/sq by a certain amount of money which is decided by what plans and materials you end up using.
This price ranges from about 400,000yen/$3,700 US to anything up and over 1,000,000yen/$9200 US. Going off these figures you would be looking at least $300,000 K US just for the house and this would be a very ordinary house, you would be looking at much more if you change around the plans too much.
One of my staff recently built a house with a cheap but big company here (Sekisui House) and it was about 35 tsubo/1225ft sq/115m sq and that cost them $240,000 US just for the house. The land cost them $100,000 US for 30 tsubo of land/1,200ft sq.
Now for land, the average price in Okinawa is about $3,000 US for one tsubo and if you were going to build a house that was 80 Tsubo you would need at least 100 tsubo of land, now do the math, you will need close to $300,000 US for that much land. Sure you will find cheaper places , but not much cheaper.
Add them both up and you are looking at over $600,000-$700,000 for a house that big (80 tsubo) if you skiped all luxuries. Of corse if you built a house that had a few nice luxuries like inbuilt air conditioners ect, it will easily go over the 1 mil mark.
Just some food for though.
@Willard Boyd, can you give me specifics as I know I can help you out on a few things.
Dave