The office carbon footprint calculator shows how much CO₂e is associated with preparing the space and its subsequent use. It separates the impact of materials, systems, equipment and construction from energy use over the analysed period. It compares fit-out, modernization and refurbishment and shows the effect of retaining existing elements.
Calculate the carbon footprint of preparing an office, see the impact of materials and building systems, then examine how the project performs during its use phase. The result also shows the effect of retaining existing elements, the monetary equivalent of CO₂ and comparisons that help put the scale of emissions into context.
Review the basic project data. If they were entered earlier for the same office, the fields will be completed automatically. You can change them without leaving the calculator.
Complete only the elements included in the project. Meeting rooms, offices, booths, focus rooms and storage areas affect the amount of material required for the fit-out.
Glazing is calculated from the room programme and the share of glazed partitions in meeting rooms and offices. If the project already has a detailed scope, set the values to match the actual design.
Retaining existing elements reduces the amount of new material. Select solutions that match the planned design and specify how much of the existing fit-out will remain.
First define the scope of new systems and the elements that will remain. Below, you can separately calculate the impact of office use: energy, controls, lighting and the analysis horizon.
Enable only the elements actually included in the investment. If equipment is outside the project scope, leave it disabled.
Logistics, work intensity and waste management affect the construction stage. Set the parameters to match the actual delivery conditions.
This is not an additional fee or lease cost. The calculator converts the footprint into a monetary value using the selected CO₂ price so that different options can be compared more easily.
The calculator combines the project scope with data for materials, systems and delivery, while the impact of office use is shown separately. Below you will find sources for the key factors and the values used in the calculations.
Preparing an office is a functional, financial and environmental decision. A new fit-out from developer standard creates a different footprint from a modernization that retains existing elements, while a reinstatement refurbishment creates a different profile again. Ecoffices Carbon Engine structures these differences: its primary result shows the office preparation footprint within A1–A5, while the impact of energy and replacement cycles over the analysed operating period is presented separately. This makes it clear which part of the impact is created at the start of the project and which accumulates later.
The scenarios below were calculated using the logic of Carbon Engine 3.0.8. They cover three scopes of work — fit-out, modernization and refurbishment — and show the impact of resource retention, functional program, standard, building systems, equipment, data quality and energy. They are comparison examples, not environmental declarations for specific completed projects.
| Scenario | Scope | Floor area | Users | Work model | Standard | Resource retention | Existing systems retained | Data quality | Energy | Cooling | Horizon | Preparation A1–A5 | Preparation / m² | Preparation / workstation | Operation | Combined | Baseline / m² | Difference vs baseline | CO₂ value | Value / month | Data confidence | Main driver | Conclusion |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| S1Refurbishment with high retention | Refurbishment | 320 m² | 32 people | Hybrid | Eco Refresh | 65% | 55% | Design data | Supplier data · 0.120 kg/kWh | Existing VRF | 7 years | 14.8 t CO₂e | 46 kg CO₂e | 568 kg CO₂e | 29.0 t CO₂e | 43.8 t CO₂e | 74 kg CO₂e | −37.5% | PLN 14,791 | PLN 176 | 72 / 100 | retention of partitions, finishes and part of the building systems | The lowest preparation footprint in the comparison. The benefit comes from a real reduction in new materials, not from the scope label itself. |
| S2Modernization with retention | Modernization | 320 m² | 32 people | Hybrid | Eco Refit | 45% | 40% | Design data | Supplier data · 0.120 kg/kWh | Optimized VRF | 7 years | 38.6 t CO₂e | 121 kg CO₂e | 1 485 kg CO₂e | 30.3 t CO₂e | 68.9 t CO₂e | 161 kg CO₂e | −25.3% | PLN 23,276 | PLN 277 | 72 / 100 | balance between retention, program and new systems | Modernization has a higher starting footprint than refurbishment, but still benefits significantly from retaining existing elements. |
| S3New Eco Start fit-out | Fit-out | 320 m² | 32 people | Office-based | Eco Start | 0% | not applicable | Generic data | Grid mix · 0.553 kg/kWh | VRF | 7 years | 55.9 t CO₂e | 175 kg CO₂e | 1 746 kg CO₂e | 179.2 t CO₂e | 235.0 t CO₂e | 175 kg CO₂e | 0.0% | PLN 79,442 | PLN 946 | 50 / 100 | new partitions, HVAC and grid electricity | A neutral reference point for a new fit-out. Over a seven-year horizon, energy has a larger impact than office preparation. |
| S4New Eco Flow fit-out | Fit-out | 800 m² | 72 people | Hybrid | Eco Flow | 15% | not applicable | Design data | Grid mix · 4% annual factor reduction | Chilled water | 7 years | 161.8 t CO₂e | 202 kg CO₂e | 2 697 kg CO₂e | 307.0 t CO₂e | 468.8 t CO₂e | 210 kg CO₂e | −3.8% | PLN 158,462 | PLN 1,886 | 72 / 100 | program scale, systems and operating period | Retaining part of the materials reduces the preparation footprint, but energy still has a major influence on the result over the full period. |
| S5HQ Eco Signature | Fit-out | 1,500 m² | 130 people | Office-based | Eco Signature | 5% | not applicable | Generic data | Grid mix · 0.553 kg/kWh | VRF · high standard | 7 years | 528.2 t CO₂e | 352 kg CO₂e | 4 063 kg CO₂e | 1 170.7 t CO₂e | 1 698.9 t CO₂e | 310 kg CO₂e | +13.5% | PLN 574,259 | PLN 6,836 | 50 / 100 | standard, HVAC, glazing, IT/AV and server room | An extensive program and high standard increase both material and technical layers. Product-specific data is required for further verification. |
| S6ESG-optimized fit-out | Fit-out | 1,000 m² | 95 people | Hybrid | Eco Flow | 45% | not applicable | Product-specific / EPD | Supplier data · 0.040 kg/kWh | District cooling | 7 years | 151.2 t CO₂e | 151 kg CO₂e | 1 989 kg CO₂e | 18.6 t CO₂e | 169.8 t CO₂e | 205 kg CO₂e | −26.3% | PLN 57,389 | PLN 683 | 92 / 100 | retention, local sourcing, disassembly and energy | A lower result requires work on both materials and operation. Low-carbon energy alone does not replace reducing the use of new resources. |
The difference between a high-retention refurbishment and an extensive HQ is almost 36 times. The result is driven by scope, standard, program and technology.
They should not be combined into one number without explanation. The first shows the impact of delivery; the second shows the consequences of energy use and replacements over time.
The percentage assessment does not compare different offices. It compares the scenario with the same floor area, scope, standard and program using neutral settings.
The calculator is a decision model for office preparation and operation. Its primary result covers A1–A5: materials and products, transport, the preparation process and the elements required to put the office into operation. The impact of later operation is calculated separately based on floor area, declared energy use, system type, electricity factor and analysis horizon.
This separation helps prevent misinterpretation. An office may have a low preparation footprint but a high energy impact in subsequent years. It may also require more materials initially while benefiting from low-carbon electricity. The calculator shows both effects without blurring the distinction between them.
The model does not base the result on one averaged indicator. It divides the project into ten categories: construction works and partitions, finishes, HVAC, electrical and lighting, low-voltage systems and IT/AV, fire protection, controls and technical systems, furniture and built-ins, server room, and transport, waste and construction activity. This makes it possible to identify project hotspots and see which decisions actually change the result.
The functional program also matters. Meeting rooms, private offices, phone booths, focus rooms, storage and shared functions affect the number of partitions, glazing and building-services scope. Two offices with the same floor area and standard can therefore have different preparation footprints.
Fit-out assumes the preparation of a new space and therefore usually has the highest share of new materials and systems. Modernization uses a lower scope factor and can additionally account for retained existing elements and equipment. Refurbishment has the smallest base scope, but its advantage depends on whether the project genuinely remains a refurbishment rather than a full rebuild described by a softer label.
In the model, resource retention reduces the impact associated with existing partitions and finish layers. For modernization and refurbishment, the share of retained HVAC equipment can be defined separately. Reuse of light fittings and floor boxes affects the electrical layer. The calculator therefore does not treat “reuse” as one general discount across the whole project, but assigns the effect to specific categories.
The result is also compared with the same project without retaining existing elements. This shows avoided emissions and the percentage reduction directly attributable to retention. In practice, the retention level should be confirmed by a technical audit rather than only declared at brief stage.
Flooring type, ceiling strategy and wall finish change the project’s material intensity. Retained flooring, polished concrete, LVT, carpet or a mixed solution use different multipliers. The same applies to full, mixed or open ceilings and to painted walls, PET panels and heavier wall finishes.
Glazing is calculated from the meeting-room and private-office program, the share of glazed walls, doors, acoustic class and any fire-resistance requirements. Higher acoustic performance, EI30, door closers and access control increase the material or technical scope. The model also allows the locality of glass and other material sourcing to be specified.
HVAC, electrical systems, lighting, fire alarm, sprinklers, BMS, low-voltage systems and the server room form the technical part of the preparation footprint. The same decisions later affect modelled energy use, but in a different way. More extensive ventilation or a higher HVAC standard increases modelled demand, while advanced controls and efficient lighting can reduce it.
The current operational model includes electricity and finish replacements resulting from the assumed durability. It does not separately calculate water use, heating from other energy carriers, employee transport emissions or refrigerant leakage. If these elements are material to a specific report, they require extended analysis outside the calculator.
For the grid mix, the calculator uses a factor of 0.553 kg CO₂/kWh and can model a percentage change in that factor in subsequent years. If the organization has reliable contractual or supplier data, it can enter its own factor. A guarantee of origin, a PPA and an actual settlement emissions factor should be distinguished from one another — the calculator uses the value entered by the user but does not verify the source document.
Furniture and equipment are not automatically included in every scenario. The user defines whether furniture is included, its scope and whether part of it is refurbished. IT/AV can be enabled separately, along with the hardware policy and server-room parameters: type, area, number of RACK cabinets, power and cooling standard.
The number of physical workstations comes from the assigned and shared workstation program. This figure is used to calculate the footprint per workstation and part of the furniture scope. The number of users remains a separate context, so the result per user and per workstation do not have to be the same.
The percentage assessment does not use a fixed Ecoffices benchmark. The engine builds a reference scenario for the same floor area, scope of works, standard and functional program, but with neutral material and building-services settings. The analysed scenario is then compared with this baseline.
Published industry values, such as approximately 120–130 kg CO₂e/m² for selected fit-outs in the RICS context or 185 kg CO₂e/m² for a baseline scenario in the JLL Manchester case study, are presented only as context. They do not determine the project assessment because the scopes and boundaries of individual studies may differ.
The calculator distinguishes between generic, design and product-specific data. A result based on general assumptions is suitable for early scenario comparison. Design data increases reliability because the program and scope are better defined. The highest confidence level requires product-specific data or EPDs that allow the factors for specific materials to be verified.
The confidence score does not certify the result. It only indicates the level of detail used to describe the analysed scenario. Even a high calculator score does not replace verification of quantities, manufacturers, EPDs and detailed design documentation.
The model converts the footprint using a default value of 78.59 EUR/t CO₂e and an exchange rate of 4.3010 PLN/EUR. These values can be changed. The monetary result is intended to compare the scale of scenarios and support management communication. It is not a construction cost, rent, tax, fee or automatic offset price.
Carbon Engine is an early-stage decision tool. It is not a full LCA, environmental declaration, organizational emissions inventory or regulatory audit document. It does not replace bills of quantities, EPDs, manufacturer data, actual material and energy quantities, or the definition of reporting boundaries required by a particular standard.
The office preparation footprint is not determined by floor area or the selected standard alone. It is shaped by scope of works, functional program, resource retention, materials, glazing, building systems, equipment, logistics and data quality. During operation, energy and potential finish replacements are added. Only by separating these elements can you assess whether a new fit-out, modernization or refurbishment is the better option.
Ecoffices Carbon Engine does not automatically produce one “green” answer. It shows the consequences of the assumptions and allows the analysed scenario to be compared with a neutral baseline of the same project. This means the environmental decision is based on the structure of impact rather than a marketing claim.
The office ESG calculator estimates the carbon footprint of decisions related to office fit-out, modernization or relocation.
It is not a full LCA audit, but a decision-support tool that helps identify which project parameters have the greatest impact on increasing or reducing the CO₂e footprint.
The carbon footprint of an office fit-out is the sum of CO₂e emissions associated with preparing the space for use.
In practice, this means that fit-out is not only an investment cost, but also an environmental commitment over the full period of office use.
Phases A, B and C help show when emissions occur over the office life cycle.
This distinction matters because some solutions increase the initial footprint while reducing emissions during operation. Without separating the phases, it is easy to misjudge which option is genuinely more sustainable.
Not always. Staying usually reduces embodied carbon, but it can preserve a high operational footprint.
Staying in the current office can be beneficial if it is possible to retain:
However, if the current office has poor energy efficiency, an unsuitable layout, excess floor area or outdated systems, its operational footprint may remain high throughout the lease term.
Relocation can make environmental sense if the new building and workplace layout significantly reduce the operational footprint.
In that case, it is worth calculating the carbon payback point — the moment when the lower operational footprint begins to offset the higher initial footprint of the new fit-out.
Resource retention is an Ecoffices indicator describing what share of the existing office elements is retained in the project instead of being removed.
Resource retention is one of the strongest ways to reduce embodied carbon because it limits the production, transport and installation of new materials. In practice, it requires a reliable existing-condition survey and deliberate design decisions.
A large share of embodied carbon often comes from layers that are treated as standard fit-out components.
Reducing an office carbon footprint is therefore not only about selecting an “eco material”, but also about eliminating unnecessary layers, retaining useful resources and designing durable solutions.
Electricity is one of the main drivers of the office operational footprint.
If the company uses a green tariff, guarantees of origin or a PPA, the operational footprint can fall significantly. In that case, embodied carbon from materials and systems becomes increasingly important.
HVAC affects both embodied and operational carbon.
The choice of cooling system, ventilation standard and level of automation therefore has significant technical as well as ESG implications.
Environmental data for materials has a direct impact on the reliability of carbon calculations.
In practice, the absence of an EPD does not automatically mean a material is poor, but it does mean lower model confidence and a need for greater caution when interpreting the result.
The footprint of unused space is the share of emissions associated with floor area that has been built and is maintained but is not actually used.
The issue is particularly visible in hybrid working models. If a company designs an office for 100 people but only 45–60 people use it at peak times, part of the materials, energy, cooling and lighting is allocated to unused space.
A sound ESG analysis should therefore consider not only footprint per m², but also footprint per workstation, employee and actually utilized space.
No. The ESG calculator is a decision-support and pre-design tool, not a formal LCA audit.
Formal reporting requires accurate material quantities, specific manufacturers, EPD declarations and detailed energy data. The calculator can nevertheless support better decisions before the project enters a costly detailed-design stage.
The largest reductions usually do not come from one “green” material, but from making the right decision about project scope.
The strongest result comes from combining resource retention, efficient use of space, durable materials and a lower operational footprint.