Job details

Office assistant 80% – Sustainable buildings sector

Company details

3E is a consultancy and technology company in renewable energy and sustainability.

The 'Buildings and Sites' department (B&S) consists of a multidisciplinary team with extensive expertise on sustainability of buildings and masterplanning. The team consists of architects, engineers and architectural engineers. B&S team is trilingual in Dutch, French and English.

B&S specialises in the preparation of integrated sustainability concepts. This takes into account energy efficiency, thermal comfort, visual comfort, sustainable materials, waste & water strategies, etc. The economic aspects are extensively investigated using detailed financial modelling and simulation.

Our clients include real estate developers, architects, building product manufacturers, energy utilities, and regional and international public authorities.

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For its Buildings & Sites department, 3E is looking for a proactive Office assistant. Reporting to the Team Manager, you’ll join a team of dozen people and are responsible for day-to-day organisation of the department, including:

  • Administrative support.
  • You’re the primary point of contact with clients, you define their needs and refer them to our team of consultants.
  • You prepare the quotations and the contracts.
  • You support the team in the tenders, you make sure that the files are complete.
  • You plan and prepare the meetings (documents and necessary material).
  • You ensure the coherence of the documents with our graphic charter.
  • You prepare the invoicing.
  • You prepare documents and materials for events that the department participates in.
  • You keep the team calendar up to date.


  • You have a pro-active, flexible and ‘hands on’ approach to work.
  • You are team-oriented, but also able to work independently, with minimal supervision.
  • You have excellent written and oral communication skills.
  • You are a good organiser, with the ability to manage your time well and deal with competing demands.
  • You have strong Office Package knowledges.
  • You are very interested in everything related to architecture, sustainable buildings.
  • Graphic knowledge is an asset.


You speak fluently English, Dutch and French.


In addition to a job related to current climate issues and a stimulating atmosphere in a highly motivated group of people, 3E offers:

  • Attractive salary package in line with your level of experience, including group insurance, hospital insurance, meal vouchers, representation allowance and company mobile phone.
  • Part-time position (4/5).
  • Sustainable transport: easy access with public transport, 100% reimbursement of public transport fare; bike allowance.
  • An international environment: projects in over 40 countries worldwide, colleagues of 20 nationalities.

  • Location: Brussels (City Center)


Kalkkaai 6 Quai à la Chaux
1000 Brussels



For more information:
at the number: 022292894
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