Home Extensions are a game feature in Harvest Moon 64.
The player may purchase extensions from the Head Carpenter in exchange for money and lumber. These extensions often serve a useful purpose for the player and make managing the farm and inventory easier.
- Cost: 5000G, 450 Lumber
The kitchen is required to get married. In it will be the recipe book, a poster showing the Power Berries collected, and a refrigerator for storing food. After marriage, it will be used to celebrate birthdays (player's, wife's, and child's) and the player's anniversary.
- Cost: 3000G, 300 Lumber
The bathroom consists of a toilet, and a spa like that in the mountains. Both the spa and toilet recover fatigue once per day.
- Cost: 2000G, 250 Lumber
It leads to the roof of the house.
- Cost: 30000G, 580 Lumber
The greenhouse is possibly the best extension to can get. It allows the player to grow any plant at any time of the year (they all become available for purchase at Flower Lillia), without having to worry about it dying when the seasons change, or wasting time during the day. The only downside to it is that it can be destroyed in a typhoon, which will cause the player to have to pay again to get another built. This can avoided if the dog is kept inside though, or winning the Invincible Katori in the Sea Festival.
- Cost: 7000G, 350 Lumber
The log-terrace is a patio that is built behind your house. Sometimes you and your wife will use it to view fireworks. Other than that, it serves no purpose, but those you make friends with will gather on it during the evaluation by the player's father.
- Cost: 1000G, 150 Lumber
The baby bed is required for you to be able to get your wife pregnant. Once it is built, it will appear at the foot of your bed. When your baby is born, he will sleep here throughout his entire life.