Does a swimming pool add value to a house?

If you are getting enjoyment out of the pool that is what matters! Do not look at a pool as a full return on the investment. If you put $50K in a pool it does not mean you increased your home value by $50K. However, you enjoyed it and it was important to you. When I work with buyers and if they are specifically looking for a pool, it is of more value to them if it is already in place. If the buyer does not want a pool, they will just move on from that listing. If it is done well then it definitely makes it more appealing to a buyer if they are looking for an entertainment space and a way to enjoy their own backyard. Keep in mind it also depends on the price point of your home, to begin with prior to the pool installation. So to directly answer your question a pool is not a dollar-for-dollar upgrade you get back in full. But it could be a selling point if this is specifically what someone is looking for when you go to put your home on the market and if there are few with pools and entertainment spaces compared to others on the market, this might work to your advantage.

I would say it is not a dollar for dollar return, and it depends on the condition of the pool.

Both ! depends entirely on the buyer however most of the time a pool will add value to your home

As stated you will not get dollar for dollar value. Most of the time on an appraisal (in Michigan) the appraiser will give maybe a $10k value. The pool could actually deter some buyers from purchasing your home but if you are looking to stay in this home for some time- your enjoyment might be worth the cost.