Reduce your company’s office carbon footprint through smart space management

16 Jan 2025

A company’s office carbon footprint is a major challenge in the fight against climate change. Did you know that the real estate sector accounts for nearly 40% of CO₂ emissions in France? Heating, air conditioning, lighting, construction of new facilities… workspaces are among the biggest energy consumers. Yet, concrete and accessible solutions allow companies to significantly reduce their carbon footprint while optimizing costs: office subleasing, coworking spaces, and resource sharing. In this article, discover how smart office management can transform your environmental strategy.

Table of Contents

The real estate sector: a major contributor to companies’ carbon footprint

Before seeking solutions, it is essential to understand the scale of the problem. According to data from the European Commission, the building sector accounts for approximately 40% of final energy consumption in Europe and generates nearly 36% of the continent’s CO₂ emissions. In France, businesses contribute significantly to this alarming figure.

The main sources of emissions in offices

The carbon footprint of offices stems from several well-identified sources:

Heating and air conditioning: on average, they account for 60 to 70 percent of a commercial building’s energy consumption. Outdated systems and poorly insulated spaces significantly worsen this situation.
Artificial lighting: In offices that are occupied all day, lighting can account for up to 20% of the energy bill. Overly bright spaces or lights left on in vacant areas waste valuable energy.
IT and electronic equipment: computers, servers, printers, monitors… Each workstation consumes an average of 300 to 500 watts per hour when in use.
Construction and renovation: Building one square meter of new office space generates between 500 kg and 1 ton of CO₂ (depending on the materials used), not including construction waste.
Vacant or underutilized office space: this is arguably the most overlooked form of waste. In France, it is estimated that 30 to 40% of workstations in large companies are empty every day due to remote work, travel, or absences.

The Hidden Cost of Unused Office Space

Empty office space represents a double waste: financial and environmental. A company that rents 1,000 square meters of office space in Paris spends an average of €600 to €900 per square meter per year, or between €600,000 and €900,000 annually. If 35% of that space is unoccupied, that amounts to between €210,000 and €315,000 spent for nothing, while continuing to heat, light, and maintain those empty spaces.

This observation calls for smart and responsible management of workspaces, using innovative approaches that balance economic performance with environmental responsibility.

Office subleasing: an eco-friendly and cost-effective solution

Subleasing office space is one of the most effective ways for companies to reduce their carbon footprint while generating additional revenue. It involves renting out part of their vacant space to other companies or freelancers.

The environmental benefits of subletting

When you sublet your unused office space, the environmental benefits are immediate and measurable:

Avoiding the construction of new buildings: every subtenant who moves into your existing offices helps prevent the construction of a new building. This directly translates to tons of CO₂ that are not emitted during the production of materials (concrete, steel, glass) and the construction process.
Optimizing energy consumption: By sharing the costs of heating, cooling, and lighting among multiple users, energy consumption per person decreases significantly. A space shared by two companies consumes far less energy than two separate spaces.
Reduce commuting: By bringing in subtenants to your building, you may be sparing them long daily commutes. Shorter commutes mean fewer transportation-related CO₂ emissions.
Minimizing resource waste: meeting rooms, common areas, shared equipment… anything that isn’t used full-time can be shared, thereby reducing the need for additional resources.

The financial benefits of subletting

Beyond its environmental impact, subleasing office space offers significant financial benefits:

Generating additional income: the rent you collect from your subtenants can cover a significant portion of your own rent. In some cases, a company can reduce its real estate expenses by 20 to 50 percent.
Sharing of fixed costs: electricity, internet, building maintenance, condominium fees… all these expenses are split among the occupants, significantly reducing housing costs.
Contractual flexibility: Unlike a standard commercial lease of 3, 6, or 9 years, a sublease can be arranged for shorter, more flexible terms, tailored to the actual needs of each party.
Real estate valuation: Well-occupied and vibrant office spaces retain their value and appeal, which can facilitate future negotiations with your primary landlord.

How do you set up an office sublease?

Subleasing office space requires certain legal and organizational precautions:

Check the terms of your lease: First and foremost, make sure your main lease allows subletting. Without your landlord’s written consent, subletting is generally prohibited.
Define the subleased spaces: clearly identify the areas you wish to sublease, while taking into account your own current and future needs.
Drafting a sublease agreement: Consult a specialized attorney to draft a clear agreement that outlines the rights and obligations of each party, the term of the lease, the rent, and the terms of termination.
Find compatible subtenants: choose companies or freelancers whose business aligns with yours—ideally potential partners or complementary businesses.
Designing spaces: Consider the layout to ensure privacy and productivity for all occupants, while fostering positive interactions.

Coworking: An Innovative Solution for Reducing the Carbon Footprint

Coworking spaces represent a major shift in how companies view their workspaces. For freelancers, startups, and even large companies looking to reduce their real estate footprint, coworking offers a particularly eco-friendly alternative.

Coworking: a naturally eco-friendly model

By its very nature, coworking is a model of resource sharing. Dozens, or even hundreds, of professionals share the same space, its resources, and its equipment. This resource sharing has a direct impact on the carbon footprint:

Optimized energy consumption: The energy used to heat or cool a coworking space is shared among all users. A 500-square-meter space occupied by 50 people consumes significantly less energy per workstation than a traditional office, where each employee has 15 to 20 square meters to themselves.
Maximum occupancy rate: Unlike traditional corporate offices, which are often empty 30 to 40% of the time, a well-managed coworking space maintains a high occupancy rate throughout the day thanks to the turnover of users.
Shared equipment: printers, scanners, meeting rooms, audiovisual equipment… all of this equipment is used to its full capacity, thereby avoiding the need to purchase additional equipment and the energy waste associated with underutilized individual units.
Strategic location: Many coworking spaces are located in areas with good public transportation access, reducing reliance on private cars and, as a result, emissions from commuting.

Coworking spaces committed to environmental sustainability

The best coworking spaces don't just share space; they incorporate eco-friendly practices into their day-to-day operations:

Renewable energy: Many coworking spaces use green electricity generated from renewable sources (solar, wind, and hydroelectric).
LED lighting and motion sensors: smart lighting automatically adjusts to room occupancy, preventing any waste.
Sustainable and recycled materials: When designing their spaces, eco-friendly coworking spaces prioritize recycled materials, secondhand furniture, or furniture sourced from local suppliers.
Optimized waste management: recycling, composting, reducing plastic packaging… best practices are becoming increasingly common in socially conscious coworking spaces.
Sustainable transportation: bike storage, showers for cyclists, charging stations for electric vehicles… coworking spaces make it easier for their members to get around in an eco-friendly way.

Coworking vs. Traditional Office: A Comparison of Carbon Footprints

Recent studies show that working in a coworking space can reduce an individual’s carbon footprint by up to 60% compared to a traditional office. This figure is due to a combination of several factors: shared spaces, energy efficiency, convenient locations, and built-in eco-friendly practices.

For a company with 10 employees that switches from a traditional office to a coworking space, the reduction in CO₂ emissions can amount to several dozen tons per year—equivalent to the carbon footprint of several round-trip flights between Paris and New York.

Implement a smart strategy for managing your office spaces

Smart office management goes beyond simple subleasing or coworking. It is a comprehensive approach aimed at optimizing every square foot and every kilowatt-hour consumed.

Conduct an energy audit of your offices

The first step toward responsible management is to measure your current carbon footprint. A comprehensive energy audit of your offices will help identify:

The most energy-intensive appliances
Outdated equipment that needs to be replaced as a priority
Areas of heat loss (windows, roof, walls)
Actual space utilization over time
Employees' energy consumption habits

This audit will enable you to develop a prioritized action plan and track your progress over time, using key metrics such as energy consumption per workstation or CO₂ emissions per square meter.

Flex office (flexible office) involves no longer assigning fixed workstations to employees. Each employee chooses their workstation upon arrival, based on their current needs. Desk sharing takes this concept a step further: multiple employees share the same workstation at different times.

These approaches can reduce the amount of office space required by 30 to 50 percent, which directly translates into a proportional reduction in the carbon footprint associated with office space. These solutions are particularly well-suited for companies with a high rate of remote work.

Smart building technologies that benefit the environment

Smart building technologies offer powerful tools for optimizing energy consumption in offices:

Occupancy sensors: They detect in real time which areas are occupied and automatically adjust the heating, air conditioning, and lighting accordingly.
Smart thermostats: They learn occupants’ habits and optimize the temperature based on occupancy times, weather forecasts, and stated preferences.
Centralized energy management: Digital platforms enable real-time monitoring and optimization of a building’s total energy consumption.
Smart meeting room booking: Avoiding situations where meetings are canceled but the rooms remain heated or air-conditioned and lit can result in significant savings.
Smart meters: They allow for precise monitoring of energy usage and send alerts in the event of an anomaly (such as appliances left on over the weekend, heat loss, etc.).

The Economic Benefits of Sustainable Office Management

While the environmental argument is fundamental, the economic benefits of sustainable workplace management are just as compelling. Here’s why profitability and environmental responsibility go hand in hand.

Significant reduction in real estate costs

Real estate is, on average, the second-largest expense for businesses, after human resources. Optimizing the use of space can lead to substantial savings:

Subletting: Generate additional income amounting to 20–50% of the primary rent
Flexible office: reduce leased space by 30% to 50% upon lease renewal
Coworking: Turning Significant Fixed Costs into Variable Costs Tailored to Actual Needs
Smart buildings: Save up to 30% on energy bills through automated optimization

Attracting talent and brand image

Beyond direct cost savings, a responsible real estate policy enhances your company’s appeal. New generations of workers are placing increasing importance on their employers’ environmental commitments. A company that adopts sustainable practices in managing its offices sends a strong message:

It is reducing its carbon footprint in a concrete and measurable way
It offers modern, flexible, and inspiring workspaces
It fosters collaboration and innovation through thoughtful design
It is part of a consistent corporate social responsibility (CSR) initiative

Creating synergies and expanding the professional network

One of the most overlooked benefits of sharing workspaces is the creation of professional synergies. Whether you sublet to partner companies or join a dynamic coworking space, you’ll increase your opportunities for networking and collaboration:

Business partnerships between neighboring companies
Sharing complementary skills and expertise
Joint contracting and joint bids on tenders
Informal exchanges that spark ideas and innovation
Access to an expanded network of professional contacts

Regulations, Corporate Social Responsibility, and Companies' Environmental Obligations

Responsible management of office spaces is subject to an increasingly stringent regulatory framework. Companies would be well advised to anticipate these requirements in order to avoid penalties and take advantage of available assistance.

The Tertiary Decree: A Requirement to Reduce Energy Consumption

The Tertiary Sector Decree (Decree No. 2019-771 of July 23, 2019) requires commercial buildings larger than 1,000 m² to reduce their final energy consumption:

-40% by 2030 compared to a base year
-50% by 2040
-60% by 2050

Companies that fail to meet these targets face financial penalties. On the other hand, those that exceed these targets receive official recognition and strengthen their brand image among their partners and customers.

Carbon Footprint and ESG Reporting: Measuring to Take Better Action

More and more companies are required to publish a carbon footprint and an ESG report (Envir