Typical costs for home improvements

Any suggestions re. prices for following?
3bedroom semi- west Dublin

1. Upgrade gas heating system
2. Two windows upvc for main bedroom/ ensuite
3. Painting of house
4. change of doors to ground floor- upgrade to any real wood!
5. any options to get rid of creaky floors in bedrooms
6. ensuite to be retiled and new toliet/ sink/ shower unit -incl electric shower

1.gas heating system...need more info...full fit from scratch about 5k
2.Window...again need sizes...probably about 600e
3.A friend got her 3 bed semi painted for 1300e (supplied own paint)..all internal..ceilings,walls,wood trims, bannister.
4.How many doors...maybe 100e per door plus 50e to hang and 50e for door furniture handles.
5.a carpenter could solve the problem easily...approx cost 150e per day
6.ensuite...totally depends on quality of fittings...if replacing in same layout...maybe 1000e for labour...at a guess you could do a complete refit for 2k?