My Megaton house is a player residence in Megaton, which becomes available after you disarm the bomb during The Power of the Atom quest. Sheriff Lucas Simms gives you a key to the house as a reward for disarming the atomic bomb in the center of Megaton. If Simms is killed during or before the aforementioned quest, his son Harden Simms will give you the key instead. At this point the "Empty House" is renamed as My Megaton house. The house includes a main floor lounge, a very small kitchenette, an upstairs landing, and an undesignated room that Wadsworth often spends time in, along with your bedroom.
You have access to a robot butler, Wadsworth, who is able to tell you jokes, supply you with purified water (he will give up to five bottles, then you must wait one week for him to recharge), style your hair and explain what your home improvements are used for. If the player has purchased the My First Infirmary, Wadsworth will remind you to use it if you pass by him injured. Sleeping in the bed on the second floor of the shack (or the heart-shaped bed if you bought the "Love Machine" theme from Craterside Supply), grants the player the "Well Rested" effect (+10% xp) for 12 hours from when he/she wakes. There are various places to store an infinite amount of items within the house, including: two lockers, a fridge, a desk and a filing cabinet. There is also a bobblehead display stand where you can place your bobbleheads.
Once you are a resident of Megaton and a proud owner of your new house, you can enhance your new home by adding various improvements, which can be purchased from Moira at Craterside Supply.
You can improve your house with an infirmary, jukebox, laboratory, Nuka-Cola vending machine and a workbench. All of these improvements add new functionality to your house, which ranges from being able to heal yourself instantly and for free, to simply being able to listen to music in your house without using your Pip-Boy radio.
If you talk to Moira, she can change the decor from a rundown shack to one of the following themes: Raider, Wasteland explorer, Vault, Science, Pre-War and Love Machine. You can't sell the themes back to her but you can always buy a new one. Players looking to obtain skill books from their themes will want to buy the Science (Nikola Tesla and You), and the Love Machine (Lying, Congressional Style) themes, since they are the only two that offer this extra gift. These skill books can only be obtained once, however. Themes will displace any items you may have already placed outside of item storage such as lockers for storage/decoration.
Stored items in the living room lockers may disappear.
You might want to remove any decorations placed around the house before purchasing themes, as once the theme is purchased, the items may end up underneath theme objects, rendering them unobtainable.
On the premises of the Megaton House there is a ledge overlooking the Nuclear Bomb. To get to it go to the stairs that leads to the Megaton gate from your house. Look to your left and there is a ledge (Opposite you is Lucas Simms' house). Then Jump onto the ledge and follow it along. There will be a small ledge where the player can store things or simply view Megaton.
The house is half standing on pillars on the roof of the Brass Lantern and half on land. From outside, it may look like it is going to collapse at any time.
It is unknown who used the house before Lone Wanderer. Moira Brown indicates that somebody lived there not a while ago.
The following is based on Fallout 3 cut content and has not been confirmed by canon sources.
An unused early version of My Megaton house called Abandoned House exists and can be accessed with the use of console command coc MegatonAbandonedHouseDummyCell. It is empty except for a chair on the first floor and a bed on the second floor. This version is untextured and some players may experience crashing shortly after entry.
ps3xbox360 Sometimes Wadsworth will get stuck in your room and you will not be able to access your bed or the file cabinet next to it (loading a previous save may work, or you can kill Wadsworth.) [verified]
xbox360 Items may teleport from the shack room to the left of the front door, but only if manipulated against another object. [verified]
xbox360pc Sometimes items will vanish from all containers in My Megaton house. Reloading an earlier save sometimes fixes this, but sometimes the glitch affects all saves. [verified]
xbox360 After sleeping in the bed a Brotherhood of Steel Paladin will spawn in your room. Cleaning out saves games sometimes fixes this. [verification overdue]