With wooden
frames, you have the option of hardwood or
softwood, which, by the way, have nothing to do with the actual «hardness» or «softness» of the wood.
For a more traditional look, consider timber
frames: if you're keen to enhance the thermal efficiency of your property, there are plenty of options to considers — from
softwoods such as Douglas Fir, to pricier hardwoods, such as oak.