Extensions

Bridge

The bridge gives you access to a whole new area of land to farm. It's fairly useless if you're conservative and don't plant much, but if you like to plant as much as humanely possible, then you'll love this.
Cost - 10000 G
Wood - 200 pieces

1st House Extension

This makes your house bigger, and better. The layout changes around as well.
Cost - 30000 G
Wood - 300 pieces

Hothouse

The hothouse will allow you to start planting flowers, but you'll need to plant them in flower pots. This will help you complete your picture books.
Cost - 50000 G
Wood - 600 pieces

Sheep Shack

The Sheep Shack will let you raise sheep for an added profit to your farm. See the animals section for more information on sheep.
Cost - 70000 G
Wood - 500 pieces

2nd House Extension

This is a BIG house. You don't need this much room, but its cool to have anyways, and it improves your score.
Cost - 100000 G
Wood - 900 pieces