Tommygunner321 has published three free mods for Fallout 4 that add a total of 32 new interior locations to the Commonwealth. The packages place new interiors across Cambridge, the Fens, and East Boston and focus on small businesses and living spaces rather than large dungeons.
The three mods break down as follows: 10 interiors for Cambridge, 12 interiors for the Fens, and 10 interiors for East Boston. Each install adds standalone shops, apartments, and other explorable indoor areas designed to populate sections of downtown Boston that can feel sparse in the base game.
All three mods are available on Nexus Mods. Download links are below:
The author posted two walkthrough videos that show the interiors in action and give a good idea of scale and placement. Watch them before installing if you want to check for overlap with other location mods or to preview any potential conflicts.
Video previews:
Players who enjoy bolting new indoor spaces onto the Commonwealth will likely find these mods an easy way to add more life and loot to downtown areas without touching quests or major map changes. Each mod is distributed as a standard Nexus package, so load order and conflict checks with other interior or city-overhaul mods are still recommended.
Find the mods and preview footage via the Nexus pages and the linked videos, and follow the author on Nexus for updates.
Follow CPG on X, Bluesky, YouTube, and Instagram for more mod coverage.
Fallout 4
Developed by Bethesda Game Studios



















