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vCheap ∞ House Stack w/Mods (538 Wood, 124 Stone, 81 Minerals, 360 Oxygen)

Blueprint for 4 houses (36 population), which can be stacked infinitely. Includes mods (Home Extension and Airtight Insulation), but can still be built (and stacked) if those haven't been unlocked. After unlocking the mods you can build upon previous layers without mods too. I've tweaked this to use as few resources as possible: 360 Oxygen, 538 Wood, 124 Stone, 81 Minerals.