I've seen it occasionally, but it's really not necessary for every little detail. It just makes it seem like the sellers are desperately trying to justify a price that is way out of range.
Remember, banks are not going to approve loans for more than the appraised price, so unless you have cash buyers who absolutely love and can't live without the house, listing all of these various improvement costs isn't going to sway the average buyer.
Savvy buyers want to know whether the electrical and plumbing are working and up to code and that the roof, water heater, water softener, heating and air are all working properly.
New floors and fresh paint are always appealing to buyers (as long the improvements are generally neutral), but saying that you spent $15,000 on new hardwoods and $2500 on new paint isn't going to make buyers agree to an over-inflated listing price. And, certainly, you know you don't get back your total costs for improvements, right? This is true even for kitchens and baths, which usually net higher returns for improvement dollars spent.
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ETA: So, for example, last year we had our entire house re-piped. It was a HUGE job. I lost count of the cuts in my walls after about 80 or so. Anyway, we did this because our pipes began cracking and leaking. We learned that our pipes were the kind that get brittle and crack, causing leaks.
Although I don't have the paperwork in front of me, I believe it was a little more than $12,000 out of our pocket. We did not have the type of pipes that were part of the huge class-action lawsuit from a few years back, so this was all on us if we wanted to do it. To me, it was a no-brainer. I was not about to worry constantly about where the next leak would show up.
Of course we had all of the proper permits pulled, and a licensed plumbing company did the job. After completion, the city came and did the inspection, and I've got all of those papers filed away for when we sell.
While we will mention "all new plumbing 2014" when we put our house on the market, (hopefully, sometime this year), we won't need to mention the costs. The buyers won't care what we had to pay. All they will want to know is that the plumbing is sound, that the job was done properly, and all of the proper paperwork was completed.
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Seriously, the best thing you can do if you REALLY want to sell your house is get a REALISTIC appraisal; look at comps in your area; and price your home accordingly.
J. F.