Mars in the 4th house (Bandhu / Sukha, the house of home & happiness) brings the significations of Mars, namely energy & courage, younger siblings, land & property, into the area of mother, home, comforts and inner happiness. The 4th house governs mother, home & property, vehicles, emotional happiness.
Results of Mars in the 4th House
Mars is a malefic planet, so here it tends to bring anger, impulsiveness, accidents, conflict and disputes over property focused on mother, home, comforts and inner happiness. As an angular (kendra) house, this placement strongly shapes the overall life direction.The exact result depends on which sign Mars occupies here and the aspects it receives.
When It Activates
These results typically surface during the Vimshottari mahadasha or antardasha of Mars, and when transiting planets trigger the 4th house. A well-placed Mars here supports a happy home, property, vehicles and emotional contentment; when afflicted it can indicate domestic unrest, property disputes and an unsettled inner life.