addition / increase
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building addition
The addition of one or more extra floors to an existing building.
Die Schule plant eine Aufstockung des Hauptgebäudes, um neue Klassenzimmer zu schaffen.
The school is planning an addition to the main building to create new classrooms.
increase
The increase of something, for example staff, capital, a budget, or an amount of money.
Wegen der vielen neuen Projekte wurde eine Aufstockung des Personals um zehn Stellen beschlossen.
Because of the many new projects, an increase in staff by ten positions was approved.
'Aufstockung' (addition/increase) is the nominalization of the verb 'aufstocken' (to add to/increase). The verb combines 'auf' (up) and 'Stock', which can mean both 'floor' and 'stock' or 'supply'. This gives rise to the two main meanings of the noun.
Wir müssen unser Personal dringend aufstocken.
We urgently need to increase our staff.
You can easily recognize the meaning from the context. If it is about 'Gebäude' (building), 'Haus' (house), or 'Stockwerke' (floors), it refers to construction. If it is about 'Personal' (staff), 'Kapital' (capital), 'Budget' (budget), or 'Gehalt' (salary), it means an increase.
Die Aufstockung des Gebäudes schafft Platz für neue Büros.
The addition to the building creates space for new offices.
'Aufstockung' (addition/increase) is very often used with a genitive object to specify what is being increased. This pattern is 'die Aufstockung des/der ...' (the increase/addition of ...).
Die Aufstockung des Personals wurde vom Vorstand genehmigt.
The increase in staff was approved by the board.
In a construction context, typical verbs are 'planen' (to plan), 'genehmigen' (to approve), or 'vornehmen' (to carry out). The purpose is also often stated, e.g. 'zur Schaffung von Wohnraum' (to create housing).
Die Familie plant eine Aufstockung ihres Einfamilienhauses.
The family is planning an addition to their single-family home.
increase / rise
Both words can refer to a planned increase in a budget or amount. Erhöhung is the general term for a higher value. Aufstockung emphasizes that additional funds or people are added to an existing quantity.
Der Stadtrat beschloss eine Aufstockung des Budgets um eine Million Euro.
The city council decided to increase the budget by one million euros.
Der Stadtrat beschloss eine Erhöhung des Budgets von zwei auf drei Millionen Euro.
The city council decided to increase the budget from two to three million euros.
