I can't answer specifically because you didn't tell me which Harvest Moon DS game you are talking about (Rune factory, Rune factory 2, Sunshine Islands, etc, are all Harvest Moon games for DS; be more specific please!) but usually there is someone in town who builds things for you, who will also upgrade your house or add on to it if you have enough money and resources. In Rune factory 2, it's Yue the merchant; in Sunshine Islands, it's Gannon. Usually, certain upgrades like building a kitchen are only available after a certain point in the game.
One game i have is Harvestmoon DS cute and another is Harvestmoon Isaland of happyness
yes there is just be patient and wait until it comes out there already is 2 harvestmoon ds cutes in the meantime just play harvestmoon ds
You have to get harvestmoon Cute to be a girl
you can get it at praline woods next to dale's carpentry and the blacksmith shop
yes you can
you have 2 work with the girl who does the cenal and house upgrade on the gam go 2 the goddess for help and finish most of the missions
200 Material Stone for the first house upgrade. 700 Material Stone for the second house upgrade.
You buy the upgrade from Gannon's shop.
You can not download Harvest moon. It is a Nintendo DS game
You can never get a second story house in Harvest Moon DS Cute.
Once you get the channel 2 sprite, get the table (you have to have this to be able to extend you house), extend your house, get a kitchen (you extend your house by calling Gotz but get a kitchen by channel 2.) You can finally get a fridge
On your telephone (at your house), ask Gotz to remodel.