Does anybody know about how much it is to construct a wood fireplace to a 30 year old home?

Are you asking about adding a wood burning fireplace to a home that has none? First, wood burning fireplaces are becoming limited in some areas- so check with your building dept. Wood burning however, are extremely expensive to add, because of fire danger & building codes ($10,000 +); it is much cheaper to add a gas fireplace or even the new alcohol burning ones as they do not need to have fire proof chimneys.