Energy efficiency isn’t just an infrastructure issue, it’s a design one too.
Because increasingly, the sustainability of your space isn’t a side note - it’s a performance metric in its own right.
As tenants and investors prioritise greener buildings, your EPC rating has become far more than a formality.
It’s a shorthand for your asset’s value, viability and future-readiness; and it’s one that directly influences leasing, lending and long-term ROI.
With new UK regulations tightening the screws around commercial property compliance, landlords, asset managers and occupiers alike are under pressure to meet EPC minimums or risk penalties, plummeting asset values and unlettable spaces.
But while attention traditionally lands on boilers, windows and insulation to achieve compliance, there’s a quieter, smarter and undeniably powerful tool many overlook - and that’s office design.
The way we light, lay out and furnish a space can make a real, tangible difference to how a building performs - offering an opportunity to build better, elevate the experience and lock-in your return.
And here at Design Tonic, we firmly believe that compliance doesn’t need to come at the cost of style!
Our team is well versed in the kind of thoughtful planning, material choices and fit out strategies that help push clients’ EPC ratings up the scale to comfortable, compliant B and beyond.
Here, we’ll dive deep into some of our design tactics - but first, let’s start with the fundamentals.
Nailing the fundamentals at Design Tonic HQ at Rose Wharf
Why EPC Ratings matter more than ever
Energy Performance Certificates (EPCs) have long been part of the compliance landscape for commercial properties, but deadlines have quickly moved them from a background technicality to a central pillar of your asset’s viability:
- As of 2023, it became illegal to continue letting an existing commercial lease if the property didn’t meet a minimum EPC E rating (unless exempt).
- From 2025, all commercial properties in the UK must meet a minimum EPC rating of C to remain legally lettable.
- And by 2030, commercial EPC requirements rise to an EPC B rating - a dramatic shift when you consider that a whopping 83% of commercial buildings currently fall below this threshold according to research by the British Property Federation.
The implications of non-compliance are real
So what happens if your EPC rating is too low?
The truth is that falling short isn’t just inconvenient - it’s commercially unsustainable.
Landlords with low EPC ratings risk substantial fines (up to £150,000 in some cases) as well as restrictions on leasing or renewing tenancies in non-compliant buildings.
The Times found that, in prime commercial cities across the UK, lower EPC scores “are affecting leasing dynamics and valuations”, showing that the cost of inaction is already real.
That means that property investors risk holding stranded assets; buildings that become unlettable or uninsurable, dragging down portfolio performance and pushing up capital expenditure.
And what’s more, lenders and institutional investors are certainly factoring EPC ratings into their underwriting risk assessments, so properties who don’t make the grade are less attractive and more likely to suffer from unfavourable borrowing terms - or might even struggle to access funds.
The upside to making improvements now?
Making the right energy improvements now doesn’t just mitigate your risks, it enhances the appeal of your commercial property.
For existing and future tenants, better EPC ratings mean lower running costs, improved comfort and a stronger environmental performance from their chosen office - all key factors when making leasing decisions.
And for landlords?
This is where clever office design plays a far more strategic role than you might expect…
Perfectly configured - Design Tonic X White Rose Education
How Smart Office Design can improve EPC Ratings
Yes, some of the big wins lie in improving the essentials - your insulation, glazing and systems - but these are only part of the picture.
In addition, think of your interior design and fit out choices as subtle but strategic efficiency boosters; making your upgrades work harder, last longer and perform better every day.
At Design Tonic, we always see every fit out as an opportunity to hardwire sustainability right into the fabric of an office (alongside the out-of-this-world looks and supreme functionality, of course).
So how do we go about improving your EPC through ingenious interior design?
Here are 5 top tips straight from our team’s playbook:
1. Choose Smart Lighting Systems
Accounting for a good chunk of a commercial building’s total electricity use (and cost), lighting is one of the quickest EPC wins around.
We specify LED lighting by default, but that’s just the starting point.
Factoring in integrated daylight sensors, motion-activated controls and zoned layouts makes sure that lighting is only used when and where it’s needed.
This is a win-win.
On the EPC front, smart lighting improves sustainability and locks in cost savings.
And for tenants and their teams, better lighting equals better ambience, better wellbeing and ultimately better productivity.
2. Configure for better Heating and Cooling
The layout of a workspace can have a big impact on how hard your HVAC systems need to work.
That’s why interior design for EPC improvement involves strategic zoning and intelligent space planning that maximises natural light and air as well as the use of smart finishes - from insulating wall systems and dividers to curtains and carpets - chosen to reduce energy loss and costs while maximising thermal comfort.
The best thing about clever configuring?
It’s perfect for heritage or constrained buildings where upgrades might be limited, like the stunning period offices of White Rose Education (above), where we employed these layout tips to fabulous effect.
3. Opt for Sustainable Materials
Crucial to any sustainable fit-out, material choices are also playing a bigger role in EPC ratings as whole-life carbon becomes a more important metric in property performance.
But what should you be prioritising to reduce embodied carbon?
Think:
- FSC® timbers
- Recycled composites
- Natural finishes
- Low-VOC products
- And repurposed pieces, from furniture to fittings
Choosing these eco-conscious alternatives has a second upside too, in that they help to create healthier interiors that align with wellbeing certifications like SKA and WELL.
And don’t miss the opportunity to take a leaf from our talented team’s books and design with longevity and disassembly in mind - this way you can keep your office adaptable and make sure you’re not unnecessarily contributing to strip-out waste in the future.
4. Build in Intelligent Tech
Today’s intelligent building systems offer powerful ways to optimise performance, reduce consumption and support better EPC ratings, improving the experience for tenants at the same time.
In our sustainable fit-outs, we often integrate zoned HVAC controls that adapt to how and when different areas are used, together with responsive lighting and heating systems that adjust automatically depending on occupancy.
Smart metering and real-time energy monitoring take things further, offering detailed, data-led insights that show exactly where energy savings can be made, and sustained.
These technologies create workplaces that are responsive, low-impact and built to perform - reducing carbon output and unlocking tangible operational savings from day one.
Their value isn’t short-term, and it’s not a one-trick pony either.
By supporting clearer ESG reporting, they help make your property more attractive to future tenants, and offer the kind of demonstrable ROI that investors are looking for.
And in EPC terms?
They can help you maintain and even improve your EPC rating over time, while keeping running costs low and energy use transparent; major wins for everyone involved.
5. Design to enable Green Behaviours
And the simplest way to improve a building’s efficiency over the long-term?
Make it easy for people to act sustainably.
We design workplaces that gently nudge teams into better habits - from visible recycling systems to layout and furniture decisions that reduce overconsumption and excess travel within a building.
These design touches are super-subtle, but they work - a beautifully designed space supports the smart use of resources day in and day out.
EPC B and beyond at Design Tonic X Zerum Manchester
The Business Case for EPC Improvements
Beyond necessary compliance, EPC improvements offer serious commercial upside, with measurable gains for everyone - landlords, asset managers and tenants alike.
Why? Because a strategic investment now in EPC delivers:
Lower running costs
Properties rated EPC D or E typically come with higher monthly costs, eating into profits and creating frustration for tenants responsible for the energy bills.
Higher tenant appeal
Tenants want efficient, comfortable and future-ready spaces, and EPC ratings are influencing leasing decisions, with better scores attracting (and retaining) longer-term, higher-quality tenants.
ESG alignment
Showing you’re taking action on carbon and energy use supports your business's environmental, social and governance goals, with measurable progress you can highlight to stakeholders.
Protection from fines and restrictions
Non-compliance doesn’t just carry hefty penalties (up to £150,000) - it risks making your asset unlettable. Acting now avoids fines, downtime and costly retrofits further down the line.
Long-term ROI
And last but definitely not least! Energy-efficient upgrades and design enhancements aren’t sunk costs; they’re a worthy investment towards increasing the value of your asset - with the potential to deliver meaningful returns well before 2030.
Strategic, Sustainable and SKA-worthy - Design Tonic X Kinrise Real Estate
Design Tonic - Future-Ready Creativity
Here at Design Tonic, we don’t see energy performance and stylish interiors as unrelated - we see them as opportunities that complement one another perfectly.
We’ve delivered out-of-this-world office refurbishments across the UK with sustainability and compliance built in from day one; each one a meticulously crafted fit out solution that blends creative flair, technical expertise and carbon-conscious planning to help our clients meet regulations without compromising a single ounce of style.
So, whether you’re a landlord looking to avoid fines and enhance your leasing prospects, an asset manager seeking to protect and grow your portfolio value or a tenant wanting to align with ESG goals and reduce long-term costs, we can help.
