Combs, The $ per sq ft costs varies depending on several criteria. One is whether you are replacing the home on a lot you already own (so the replacement cost does not have to cover the cost of the land) or are rebuilding at a new location (where the lot cost has to be calculated as well). Another is the level of amenities you intend to include. While you may be able to approach $100 per sq ft when your standards are vinyl flooring or carpet, laminate countertops, one or one & a half baths, modest kitchen, etc., if you prefer to include hardwoods & tile flooring, granite countertops, several baths perhaps with seperate tub + shower, extensive millwork, etc. the cost would more likely be in the $200 per sq ft range. Custom homes can be higher in cost and the average home in the Exton area may be somewhere in the middle.