Pire,

Few points from me,

I don't know much about economics but the exponential growth of the price of land plots and houses  doesn't seems natural. So hakim_saab and few others could be true on their points. Definitely you can't expect to get back your investment by renting the house whether it follows the normal rule of economics or not; the fact is that you will not able to get back your investment simply by renting the house, even you will be not able to get interest that you will earn from bank. If you want get good return of your money from renting the house then you have to start from scrap, need to find cheapest piece of land, build a house with very low quality construction materials with  maximum numbers of rooms. There will be huge difference between the cost of house you made by yourself and the house bought from someone else. My point is forget about making good money from just renting your house. As you mentioned above, deposit your money in bank and enjoy with the interest they will pay you. Other option to make good money from house is buy a house and hold it for couple of years then you will make good money by selling it. Meanwhile, you will be also earning from renting. This option will work only if you are investing from your own pocket and can wait to sell the house during unfavorable econmic condition in the market. I have seen people involved in town planning business becoming millionare and going back to street within a year.

But if you seriously looking for a house to with resident purpose then I will suggest to move little far from the hub of Kathmandu valley. Places like Budhanilkantha, Bhainsepati are ideal. But I will also suggest to consider the risk of natural hazards in the place you are planning to buy a house. Well, Dhulikhel could be the best option but you need to consider also your work. What you are planing to do after you return in Nepal. Do you need to commute Dhulikhel to Kathmandu everyday for your work? If yes then Dhulikhel might not be the best place and the reasons are obvious.