First thing you have to think trough, are getting windows
. Of course, you got plenty of alternatives to select, but if you are living in the area with cold winters, the greatest will be to choose isolated ones. There are a lot of different great species of it, from any possible brands. Only ask someone skilled for his opinion, cause it will help your internal and external wall insulation. So when you are visiting local market for fibreglass mesh, maybe ask salesman about it?
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Different thing is the inside of your home. The classic walls will be nice, but not if you like to leave as many warm air inside as workable. You must to get any information about interior paintings, fibreglass mesh, and another objects that will do this work nice. Beside, even if you are living in flat, mostly with self heating, you could consider to invest in this, because it will lower your costs likely, only wait for winter to come. Good option will be wainscotting, but several people are afraid of getting bugs over it.
Last but no least, is external wall insulation, the most important of all - learn more. If you won't do it in good way, another two methods will be spoiled. You have many of materials available right now, in various prizes. You might also install exterior playwood, which would change the look of your home. There are many of another tones of it, it may looks like an oak, or nut tree, be far more stylish, like steel, or imitation of glass. The only edge is your imagination. But the most relevant - it would assist you to leave the warm air inside your house.
When you are building your own home, you have a lot of plans to make. The size, height, amount of floors. You must to choose builders, buy the greatest fibreglass mesh and wooden bricks. But also, do not forget to invest into good windows and interior & exterior wall insulation, cause it will assist you to save plenty of money during the winter.