You may be looking for some other kind of answer, but it seems clear that after you put in the sweat, an unbiased professional appraisal (not a realtor's market analysis or estimate of value) will give you a good idea. Of course, an appraisal prior to the work would give you a reasonable comparison, given that you can adequately adjust for market changes between appraisals. If you are not in a position to pay for appraisals, a realtor's market analysis would be informative.
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Yes it is possible that sweat equity to the individual could attract some attention.
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