The classic planning question — asked daily and answered wrongly more often than not. The realistic rule for Berlin: 8–12 m² per workstation across the whole office, including meeting rooms, kitchen and circulation.
Quick numbers by team size
5 people ≈ 45–60 m² · 10 people ≈ 90–120 m² · 20 people ≈ 180–240 m² · 50 people ≈ 450–600 m². Open-plan layouts sit at the lower end, cellular offices at the top; add ~10% if you host clients regularly.
What does that cost in Berlin?
At the current median of about €26/m²/month across our listings, a ten-person office of 100 m² runs near €2600 per month plus service charges — noticeably less in Charlottenburg-Wilmersdorf, Tempelhof-Schöneberg, Lichtenberg, more in Mitte, Potsdamer Platz.
Don't forget the growth buffer
Hiring plans of 20% a year mean your “right size” today is wrong in eighteen months. Either add the buffer now or choose a building with expansion options — both filters work on RentOfficeToday's Berlin search.