extension
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extension
An additional part of a building that is added to an already existing building in order to create more space. A synonym for this is the term annex.
Die Schule bekommt einen Erweiterungsbau für die neuen Klassenräume und die Bibliothek.
The school is getting an extension for the new classrooms and the library.
This word is a compound made up of 'Erweiterung' (extension/expansion) and 'Bau' (building/construction). The linking element '-s-' connects the two parts. Literally, it describes a construction that serves to expand an existing building.
Der geplante Erweiterungsbau wird zwei neue Stockwerke haben.
The planned extension will have two new floors.
Common verbs used in connection with 'Erweiterungsbau' (extension) are 'planen' (to plan), 'bauen' (to build), 'errichten' (to construct), and 'genehmigen' (to approve). These words describe the process from the idea to completion.
Die Firma plant einen Erweiterungsbau für die Produktion.
The company is planning an extension for production.
The term 'Erweiterungsbau' (extension) is used mainly in formal and technical contexts, such as architecture, urban planning, or official announcements and news reports.
In der Zeitung stand, dass das Museum einen Erweiterungsbau bekommt.
The newspaper said that the museum is getting an extension.
expansion / removal
'der Ausbau' and 'der Erweiterungsbau' can both have to do with more space or greater capacity. 'der Ausbau' is a general process: something existing is expanded, improved, or enlarged. 'der Erweiterungsbau', on the other hand, is a concrete additional part of a building that is added to an existing building. The words can be confused because an Erweiterungsbau can be part of an Ausbau. If you are talking about the process or the measure, 'Ausbau' fits. If you mean the new part of the building, 'Erweiterungsbau' fits.
Hinter der Schule entsteht ein Erweiterungsbau mit sechs neuen Klassenräumen.
An extension with six new classrooms is being built behind the school.
Der Ausbau des Krankenhauses soll mehr Behandlungsräume schaffen.
The expansion of the hospital is intended to create more treatment rooms.