Office Manager (Part-time 3 month fixed-term contract)

Greenhouse is an award-winning communications agency with a mission to power positive social and environmental change. We work with clients in sectors where we can have the biggest impact on the transition to net-zero; from energy, clean tech, transport, finance, food, nature, oceans, to youth and future generations.

We are looking for a dynamic and experienced Office Manager who wants to make a positive difference in the world and would enjoy working in a busy and mission-focused
team, based in either our London or Bristol office.

Reporting into the Head of People and Culture.

Roles and Responsibilities

Office Manager

  • Managing London and Bristol office facilities and supplies.
  • Supporting staff and managing requests in the London and Bristol office.
  • Monitoring office related expenditure against a budget.
  • Managing condition and appearance of offices.
  • Fielding enquiries to our office via mailbox and office phone.

Supporting the Managing Director

  • Planning ahead and helping to prepare MD for upcoming events or meetings.
  • Responsible for the proactive management of MD’s inbox and calendar.
  • Anticipates diary/calendar changes and responds accordingly.
  • Sources information/documents and pre-brief material from relevant sources for MD.
  • Develops high quality documents e.g. presentations/agendas/letters.
  • Manages business-sensitive information in a professional manner with confidentiality.


  • Support on new business tendering – fielding new enquiries and responding.
  • Working alongside finance team updating agency management system, Forecast.
  • Managing the relationship with our IT Managed Service provider.
  • Managing international travel for COP29.


  • Support for recruitment of roles, co-ordinating interviews and tracking applicants.
  • Creation of ad hoc letters (salary rises/promotions/bonus/offer letter).
  • Updating HR system.

Skills and experience

  • Personable, efficient, motivated.
  • Organised and adept at prioritising your workload and juggling deadlines.
  • Self-starter who learns quickly and is able to use initiative.
  • Flexible and able to adapt to the needs of a growing team.
  • Proven experience supporting business leaders in senior management roles.
  • Strong communicator and able to engage with key stakeholders.
  • Able to pre-empt issues/problems before they arise and remain solutions focused.
  • Proficient in Microsoft applications, with a keen eye for design and attention to detail.
  • Experience using Forecast agency management software or similar will be a bonus.
  • Passion for making a positive difference to the environment and world around us.

Salary and benefits

  • £35-45K per annum (dependant on experience), pro rata.
  • Fixed term contract for 3 months, working 3-4 days per week.
  • Flexible working: core hours 10am-4pm
  • 25 days holiday pro rata
  • Office perks such as breakfast, organic fruit.

How to apply

Please get in touch with your CV and a cover letter telling us about why you are interested and what you would bring to the role to

The diversity of our workforce is important to us, and we particularly encourage candidates from Black, Asian and Ethnically Diverse backgrounds or Disabled, D/deaf and/or neurodivergent people. To help us track the background of our applicants, we would appreciate you completing a short survey along with your application. This will also help us to offer you the appropriate support if you are successfully invited for an interview.