if shop purchased and used for own business then the asset is business asset. so if renovation incurred is in the nature of repairs ie no addition to building then it is only repairs. so only deduction is only u/s 30 for repairs. if that is the situation depreciation will have to be charged on shop original cost. if that is tha situation the gain will be short term capital gain. if shop is let out it is income from house property. then renovation can be claimed as cost of improvement. so indexed cost can be claimed for both original cost and improvement. then gain will be long term capital gains.if long term capital gains reinvestment can be made either u/s 54F or u/s 54EC to claim exemption