The improvements you mentioned are added to the basis of the total property (land + house) in order to calculate your capital gain on the sale.
You do not split the costs between land and improvement, but consider the property as a whole. [The only time you separate the land and the improvement is when you are calculating depreciation.]
Add the improvements to the basis of the house (what you originally paid for the house and land together), as well as any closing costs (from the purchase AND the sale of the property).
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