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11 Overview
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33 Basements are a planned Build Mode feature for inZOI scheduled for the Q4 2026 (October to December) timeframe per the 2026 Roadmap Part 1 letter. The feature will introduce underground floor construction, letting players build below ground level.
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55 As of April 25, 2026, Basements have not shipped on the live build (v0.7.5). The current building system supports above-ground floors with adjustable foundation height, but does not allow constructing below ground level. The Q4 2026 update will add basement support as a complementary expansion to the existing multi-story building tools.
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77 Confirmed Components
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99 ComponentDescriptionUnderground Floor LevelsFloors constructed below ground level. Specific number of supported underground levels has not been disclosed.Basement ConstructionWalls, floors, ceilings, and fixtures placed in basement spaces. Compatible with existing furniture catalogs.Lighting and VisibilitySpecific lighting model for basements (whether windows, lighting wells, or stair-down access provide visibility) has not been disclosed.
1010 Connection to Other Q4 2026 Build Mode Updates
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1212 Basements are part of the Q4 2026 building expansion that also includes:
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1414 Basements: This article.Wall Decoration Modules: Interior and exterior wall decoration system.Terrain Editing: Custom landscape sculpting (initial development).
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1616 Together these features substantially expand the construction toolkit and complete the planned 2026 Build Mode roadmap. Curved Walls (in Q3 2026) and Basements (in Q4 2026) round out the major shape and dimensional expansions for the year.
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1818 Use Cases
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2020 Once shipped, basements will enable:
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2222 Residential basement spaces (workshops, hobby rooms, home theaters, wine cellars).Commercial basements for owned businesses (gym lower-level studio space, restaurant cellar storage, basement bars).Storage and utility spaces that don't take above-ground square footage.Themed basement environments (haunted house, prison cell, secret hideout) using existing decorative items.
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2424 Timeline
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2626 DateStatusDecember 26, 2025Announced in the 2026 Roadmap Part 1 letter as a Q4 2026 deliverable.March 26, 2026v0.7.0 anniversary update did not include Basements. Q4 schedule reaffirmed.Current targetQ4 2026 (October to December) per published roadmap.
2727 Open Questions
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2929 Number of underground floor levels supported (one basement only, or multi-level basements).Whether basements support windows, lighting wells, or only artificial lighting.Whether existing properties can be retrofitted with basements or only new builds.Whether basements affect property value calculations or appear separately on Edit City listings.Whether weather and natural disasters affect basements differently from above-ground floors.
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3131 See Also
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3333 Build Mode covers the current building system. Foundations and Basements covers existing foundation system. Curved Walls is the Q3 2026 partner feature. Wall Decoration Modules is bundled in the same Q4 update. 2026 Roadmap tracks delivery status.