it depends upon how big house you are going to built, what kind of uses/ building types, location- cost may vary with inside and outside ring road of ktm, and other major factor material, and the most imp factor is earthquake- building should be earthquake resistant and should not be lie under the fault line, generally nobody check that kind of infomationbut after M7.5 earthquake we should take consider and check fault lines and proper check of soil test before the built . You cannot easily say the cost without blueprints or design, generally design or blueprint cost may depends 3% -5% of the total building cost.
for the labour and material 40/60 or 30/70 depends upon location.
and for the tax it varies 10 rs sqft to -25sqft depending upon uses , area, and location.

and there are many other factors that may change the cost of the building .
there are only general information .

thanks