Generally 7th house is the most important house for marriage but there are other houses also which are important to know more things about your marriage life in detailed or precise way.
1sthouse(Self): 1st house is ‘7th from 7th house’ (Bavathbavam concept),so its important house for marriage. 1st house represents your body, how you look, whether you are healthy or not,strengths etc.When you will marry someone definitely these things are very important along with your career. So 1sthousetoo plays a very important role in your marriage life.
2nd house(family house): ”Marriage brings changes in to your family”. Family is represented by 2nd house in vedic astrology.After marriage women move to husband’s house and enter in to new family and hence after marriage women get changes inher family. Similarly for men, wife becomes the part of his family and hence marriage brings changes to his family.
5th house(love and romance in marriage life,kids):Marriage is for lot of purpose among those kids is one of the important purpose. Love, affections, romance etc. between wife and husband is also controlled by 5th house thus making it an important house as well.
7th house(legal bondage, general house for marriage): General house for marriage from which married life is predicted.
8th house:8th house represents In-laws family, sexuallife, longevity of spouse etc. matters which are again very important part to marriage. In India generally for female In-laws relationship is important especially due to joint family culture which still exist in some parts of India .Even if 7th house is good,but 8th house is bad then there might be problems in marriage life.
12th house: Bed pleasures,spouse’s pastaffair and whether spouse was already married or not can be predicted.
So these are the important houses for marriage after 7th house.