Yes, there is a way to show a house on the map in Rage V3. You can use the SetBlipAsShortRange function to create a blip on the map and set it as a short-range blip. Then, you can use the SetBlipSprite and SetBlipColour functions to customize the appearance of the blip, such as setting it to a house icon and changing its color to red. Finally, you can use the SetBlipCoords function to set the position of the blip on the map to the location of the house.