Any expense that does not pay for itself by adding to the value of the house or allowing it to be sold more quickly is an unnecessary expense.
Here is an example from the beginning of my career, many years ago. In order to provide a real luxury feel to some offices, I covered one wall in each office with wallpaper. It was an accent wall, which was very popular at the time. Not just any wallpaper would do for me because I expected to have very discriminating tenants. As a result, I chose $120-a-roll Italian silk wall covering. One ten-foot wall cost a little over $1,000, and I had many offices with many such walls.
No doubt about it, the walls were exquisite, for a day or two, until the first fingerprints that could not be wiped off the Italian silk. Until the first tenant drove railroad spikes into that silk to hold up a bulletin board. I quickly realized that my tenants did not care about having an Italian silk wall covering, and it was a really stupid thing on which to spend money for a rental space.
Do not make my mistake. Keep in the forefront of your mind all the details of houses in your ultimate price range. The quality of your materials and your selection of features should match those other houses, not what you want in your own dream home. If you feel you must splurge on something to stand out from the crowd, pick one dramatic thing only. I recommend a steam shower. They cost far less than a whirlpool tub and appeal to men and women both. Other possibilities are a hot tub/spa, closed circuit security cameras, or a water feature in the landscaping. When prospective buyers are talking about homes they have visited, you want them to say, “Which one had the steam shower?” I guarantee you that the dramatic statement in one area will overcome economy choices in other areas.