This page lists all house improvements in Fallout 3.: The content is not described in full detail on this page. For details, please see the respective articles. For house improvements in other Fallout games, please see 'House improvement'.; For an overview of Fallout 3 content, please refer to 'Portal:Fallout 3'. Fallout 3 - Game of the Year Edition. Its located by default outside of Megaton, but you can chose to have it located in one of 4 different locations when the mod is installed. A downside is it can't be purchased until after Rivet City is discovered during Scientific Pursuits. I think its a great house mod as it offers a bunch of unique and desirable features. Fallout 3 - Megaton House Extended v2.61 The main function of this mod is to greatly expand upon the Megaton House. First off the back wall of the bottom floor was removed to make way for a massive new living room, Kitchen w/ bar, and a full bathroom. I got all the megaton house themes in Fallout 3 but how do i change it? I downloaded this mod which had all these items i got all the house themes but how do i change the theme? Source(s): megaton house themes fallout 3 change it: https://biturl.im/6FftK.