> For the complete documentation index, see [llms.txt](https://docs.ladybug.tools/dragonfly-primer/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ladybug.tools/dragonfly-primer/components/0_create/rejoin_to_building.md).

# Rejoin to Building

![](/files/sch01opxA3Fav9yQGW8q)

![](/files/NxbydHhoAGYWVOF5Qh6h) - [\[source code\]](https://github.com/ladybug-tools/dragonfly-grasshopper/blob/master/dragonfly_grasshopper/src//DF%20Rejoin%20to%20Building.py)

Rejoin a list of Room2Ds that were originally a part of a Building back to a new Building with updated Room2Ds.

In the event that the input contains Room2Ds that were not a part of an original Building, this component can still be used but the stories will be regenerated based on the Room2D floor elevations and a warning will be given.

### Inputs

* **room2ds \[Required]**

A list of Dragonfly Room2D objects to be re-joined into Buildings.

### Outputs

* **buildings**

Dragonfly Buildings containing the input Room2Ds. This may be multiple buildings when the input Room2Ds originally had several different parent buildings.