Most of the Dharmaville filming occurred in and around a group of five Camp Erdman cabins numbered 18 through 22 inclusive. Cabin 19 appeared on film as Juliet Burke's Island home. It is in fact the first Barracks abode to appear onscreen, debuting along with Juliet in the season 3 opener A Tale of Two Cities. On the day we visited Camp Erdman a red shirt lay on the picnic table in front of cabin 19 -- I couldn't help but be reminded of the red blouse worn by Juliet during her final days.
Season 4's The Other Woman showed us the moment when Ben offered the house to Juliet.
Jack and Sayid passed by the home shortly after acquiring Jughead's thermonuclear core in The Incident.
This is a shot of the right side of cabin 19, which is visible onscreen a couple of times. The side door, as well as the trim on this and other cabins, has been repainted dark brown.
And for completeness this is the left side of the cabin. The small structure in which Ethan was poking around seems to have been temporarily positioned there for filming.
In the cap below from A Tale of Two Cities Juliet's home is directly behind her.
The shot below from Namaste features a different angle, with Juliet's home on the far right. The house directly behind Juliet is in reality cabin 18, which did not appear often onscreen and didn't seem to house any major character.
I did manage to snap a pic of cabin 18 as it appears today.