Office retrofit vs office relocation: which is the lower carbon choice? 

Deciding whether to stay and retrofit or move to a new office is usually treated as a property question. It is also a carbon question, and increasingly a compliance one. The instinct is that a newer building must be the greener, safer choice. Once embodied carbon enters the room, it often isn’t.

A move can trigger new materials, strip-out waste, transport emissions and a fresh fit-out cycle, while a well planned retrofit keeps the value already locked into the building you occupy. The right answer depends on the building, the business and how much really needs to change; which is exactly why it should be compared properly, not assumed.

For occupiers, this is not only a landlord compliance issue. It shapes lease strategy, dilapidations, dual rent, downtime, staff disruption, client experience, whether the next office genuinely supports hybrid working, and how the move reads in your ESG reporting. The carbon question sits inside all of those decisions, not beside them. 

The short answer:

If your location still works and the building has good bones, retrofit is usually the lower-carbon choice. If the building can’t meet your performance, comfort or business needs without disproportionate intervention, relocation can still be the right call.

The direction of travel just got clearer

Office decisions used to turn on rent, size and location. Now they turn on energy performance too. In its interim response of 18 June 2026, the Government confirmed its intention that, from 2031, it is proposed that privately rented commercial buildings over 1,000 square metres in England and Wales will need to reach EPC B where cost effective, with smaller buildings staying at the current EPC E minimum, and the previously proposed interim EPC C milestone for 2027 dropped. The change takes effect only once secondary legislation passes through Parliament.

It is proposed, not yet law, but the direction is set and the lead times are long. A meaningful upgrade runs 12 to 18 months, and CBRE estimates 58% of Central London office stock currently sits below EPC B. There is a direct occupier upside, too: the Government expects the change to cut energy bills for tenants of the largest rented buildings by up to £360 million a year by 2031.

For owners and occupiers alike, this reframes stay-versus-move. The risk is no longer just cost, it’s the “brown discount”, the growing valuation and lettability penalty on assets that can’t meet the standard. Move into a building that only scrapes EPC B and you may inherit tomorrow’s problem; walk away from one you could have upgraded and you may be leaving a compliant asset behind to start a fresh carbon and capital bill elsewhere.

For a practical route through the rating itself, see our guide to improving commercial property EPC ratings. 

Two carbon clocks: embodied vs operational

Here is the part most stay-or-move conversations miss. A building carries two kinds of carbon on two different clocks. Operational carbon is the energy it uses year after year. Embodied carbon is locked into its materials and fit-out, and it is spent up front the moment something is built or fitted out.

That distinction decides the argument. A newbuild move may come with a lower operational-energy story. But the embodied carbon in the building has already been spent, and a move triggers a fresh fit-out whose carbon is spent immediately, the moment you build it out. As the grid decarbonises, operational emissions keep falling while that up-front embodied hit stays fixed, so embodied carbon is becoming the larger share of the total. The fit-out you don’t rip out, and the materials you don’t rebuy, are increasingly the whole climate case.

Newer does not mean lower carbon – not once embodied carbon enters the room. 

What relocation actually costs in carbon

A move is rarely just a move. UCL’s research into non-domestic fit-outs found the supply chain is largely linear, with mixed waste the highest-mass waste stream and very little closed-loop recovery.

Three costs stack up:

• Fit-out. A new space means a new fit-out, and interiors carry a heavy embodied-carbon load. JLL’s circular-office work shows how much sits in the materials and components most people overlook.
• Strip-out. Before the new space is occupied, the old one is usually stripped out. UCL found office strip-out produces large volumes of mixed, plasterboard and timber waste, much of it downcycled rather than genuinely recovered.
• Duplication. Serviceable desks, joinery and partitions get binned because they don’t suit the new layout or brand; so you pay for your fit-out twice, once in money and once in carbon.

When retrofit is the lower carbon, and lower risk choice 

Retrofit usually wins when the building is fundamentally sound and the job is to improve performance, layout or experience. The savings come from three places. 

Retaining structure and fabric

More than half of a new build’s embodied carbon sits in the substructure, frame and roof, the very things a refurbishment keeps and a rebuild discards. Savills puts the carbon saving from deep retrofit over redevelopment at 40 to 70%. Policy is catching up: the City of London now runs a “retrofit first” regime, with schemes expected to retain at least 50% of the existing superstructure by mass and a “retrofit fast track” through planning. In the City at least, retention is increasingly the faster consent route, not the harder one. 

Reusing the fit-out

Circular fit-out strengthens the case again. When PLP Architecture treated its own London studio as a circular test bed, 92% of materials were reused or donated and embodied carbon fell by 75.4% against a conventional fit-out, delivered at roughly a third of a typical London cost. Reuse isn’t the compromise; it’s frequently the cheaper, lower-carbon answer.

We see the same on our own projects: for Ecosurety, 99% of the furniture from the previous office was reused, refreshed and reupholstered on a SKA Gold scheme; for TLT, existing meeting tables, desk frames and storage were retained and 1,600 acoustic desk screens reupholstered rather than skipped; and at FOUNDRY, 100% of construction waste was reused or diverted from landfill.

Cutting waste at source

A retrofit also avoids the over-specification that full relocation invites. UCL found that early material review, standardisation and reuse channels are what actually enable recovery, and that the most wasteful projects are usually the ones that default to full replacement.

When relocation still makes sense

Sometimes moving is right, and it’s worth being honest about when.

• The building genuinely can’t perform. If the asset is technically unsuitable or so constrained that bringing it up to standard would cost more than it’s worth, a move may be the sounder long term call.
• Operational carbon can’t be improved enough. A poorly performing building may need such deep intervention that a well designed new one delivers lower whole-life carbon over a long enough horizon. The answer isn’t automatic either way.
• The business has fundamentally changed. If headcount, location strategy or working model have shifted dramatically, a better fitting building may win; but the move should still be tested against its carbon and compliance cost, not just the operational upside.

How to compare them properly

Whichever way you lean, compare like with like.

• Carbon: whole life, not just operational energy; model embodied and operational together.
• Compliance: where each option leaves you against the proposed EPC B standard from 2031, including the building you’d leave behind.
• Cost: relocation adds fit-out, dilapidations, transport, advisory fees and downtime; retrofit is often leaner where existing value is retained.
• Programme: a move looks faster until you add fit-out and logistics; retrofit can be phased and occupied.
• Disruption: moving is a hard reset; retrofit can be planned around your people, which is why more organisations now improve without a full decant.
• Flexibility: the real test is whether the resulting space absorbs future change without another major intervention.

Retrofit vs relocation at a glance

A simple decision framework

1. Can we stay? If the location still works for people, staying and improving is usually the lowest carbon route.
2. Can we retrofit to standard? If the building can reach the performance, comfort, brand and EPC level you need, then UKGBC’s guidance is clear that prioritising retrofit over relocation is the stronger carbon decision.
3. What can we reuse? Identify early what can be retained, reused or repurposed; once the design is fixed, the best circular opportunities are gone.
4. Only then, should we move? If the answer to the first three is no, relocation may be right. You can still plan a move that reuses assets and minimises the carbon involved in the transition.

How we approach it at Interaction

We start every project with the same question: what can be kept, improved or reused? That protects value and usually cuts carbon faster than defaulting to a new office. As a B Corp with an in-house SKA assessor and a supplier database that tracks EPDs, we measure embodied carbon rather than guess at it, and we target 99% diversion of project waste from landfill. You can see that thinking across projects from Ecosurety to TLT and Osborne Clarke.

Whether the answer is retrofit, partial move or new building, reuse should be on the table early and explicitly. The best workplace decision is never only about carbon or only about cost; it balances sustainability, compliance, workplace quality, programme and commercial reality.

For more on how that improves the asset itself, see how sustainable design boosts commercial property value, or explore our sustainable office solutions approach. 

The bottom line

Relocation is not automatically the greener choice. In many cases a well-planned retrofit delivers lower embodied carbon, less waste, easier EPC compliance and better value by making the most of what already exists. The smart decision compares carbon, cost, disruption and compliance before committing. For a lot of organisations, that means staying put, retrofitting well, and reusing as much as possible.

Before you move, measure what staying could save. Let’s compare the carbon, cost and disruption of staying versus moving before you commit – talk to us about sustainable office retrofit.