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SKYDB Building database

Tall buildings worldwide, with heights, construction status and the companies involved.

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Tall Building Markets

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Professional building research, data exports and API access, plus advertising offerings.

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SKYDB Insights charts showing buildings by decade, status, use, floor count and height

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Professional research into buildings and participating companies.

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Tall buildings, tracked.

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definition strict definition

horizontal addition completed

A new extension to the side of an existing structure is finished and ready for use.

A horizontal addition to a built object is completed when a significant extension at the side of the existing object, abutting it while resting on new foundations, is physically finished and ready for use. If the addition is built on top of the existing object, it should be classified as a vertical addition.

The completed extension must abut the existing object and rest on new foundations beside it. A separate building nearby is not this side addition.

Horizontal addition begins construction records the start of the extension. Its completion concerns readiness of that new space for use and can occur long after the original object was completed.