With today’s commercial tenants making faster decisions with sharper eyes and higher expectations, the gap between a good office and a great one has never been more visible.
Now, the spaces that convert viewings into signed leases are the ones that feel considered and complete from the moment you enter - clear in the flexibility as much as the finishes; in the style, the layout and the sense that this workspace was designed for modern productivity at all levels, not just superficially.
For landlords, this changes how CAT A and CAT A+ fit outs should be approached; not just in terms of what goes into them, but also in how they’re able to perform over time.
The best? They’re not just designed to get your space leased. They’re about getting it right, for this tenant, and the next one, and the one after that.
Here’s how our talented team helps landlords achieve just that…
Design Tonic X Kinrise Real Estate
CAT A+ has raised the bar - but the bar is still moving
There’s no doubt that CAT A+ - the fully fitted, furnished and move-in ready step-up from a CAT A shell - changed the game for landlords.
Plug-and-play office design that was functional and finished from day one removed the friction of moving in and opened commercial lets up for a wider, more agile pool of occupiers - with faster lettings, reduced voids, higher rents making them a logical choice for forward-thinking owners.
Tenant expectations, though, haven’t stood still, which has ushered in a whole new generation of CAT A+ - and we’ve talked before about what this looks like in practice.
To add further depth for future-focused landlords, here we’re looking at how decisions can be made at the fit out stage that pay dividends not just on first letting, but across the full life of an asset - something which starts with thinking differently about what a CAT A/A+ fit out is actually for.
Ready to let - and ready to last
The traditional approach to a CAT A fit out - or a CAT A office refurbishment - was largely about getting to market.
Neutral, functional, presentable, these spaces presented a clean slate for whoever came next - and while this is a thought process that hasn’t disappeared, it’s just not enough on its own anymore.
The real commercial question for landlords now isn’t only “will this let?”, it’s “will it continue to perform, through renewals, relettings and the inevitable shifts in how businesses use space, and without a costly overhaul each time?”
The good news is that a futureproofed fit out answers both.
Designed for both longevity and immediate appeal, getting the fundamentals right means that smart fit out decisions today are also the ones that are most commercially viable tomorrow.
CAT A perfection at Design Tonic X St Paul’s Street Investments at 26 York Place
What a modern CAT A/A+ office should include
So what does getting it right look like now?
Every project is different, but the best-performing spaces we deliver for landlords tend to share the same core ingredients, from reconfigurable layouts and thoughtful zoning to built-in sustainability and considered comfort designed in that make the space genuinely pleasant to spend time in.
So where should the real work happen? Here’s our take…
Flexibility built in, not bolted on
Adaptability is the quality that separates a fit out that keeps giving from one that dates quickly.
A space designed around one type of occupier - one working style, one vision of how a layout needs to function - works beautifully until it doesn't.
The moment that tenant leaves, its specificity becomes a constraint; with what felt considered for them needing undoing before it can appeal to anyone new.
This is why a Design Tonic office - whether CAT A or CAT A+, is always designed for genuine flexibility from the off - our team thinks in terms of systems rather than fixed solutions.
This means our layouts can be reconfigured without major works, our zones serve different purposes, tasks and times of day, supporting everything from focused solo work to the collaborative demands of a hybrid workspace and our infrastructures support a range of occupier densities without needing big reinvestment between leases.
Our goal is always to create spaces that blend the kind of out-of-this-world style that a wide range of businesses can immediately picture themselves in with the versatility to make that a seamless reality - as well as the ability for a landlord to simply refresh between tenancies without going back to basics.
Design quality that retains as well as attracts
First impressions matter, but they're not the whole story.
A space that photographs and shows well will always have an advantage at the leasing stage - but the fit outs that deliver the strongest long-term returns are the ones where the quality of thinking goes deeper than the surface; where the layout genuinely supports how people work, where the atmosphere makes the commute feel worthwhile and where the details have been considered with enough care that tenants settle in and stay.
None of this is about over-designing or imposing a strong aesthetic that limits appeal.
It's about achieving the balance that the best flexible office fit outs always strike: a space that feels complete and characterful from day one, without ever feeling like it belongs to someone else.
Design Tonic X Kinrise Real Estate
The spaces in between
And let’s never forget comfort at the basic, even subliminal levels, because a great fit out is as much about how it feels through a full working day as it is about how it looks.
This means thinking carefully about things like acoustic comfort and colour psychology.
It means planning in lighting that works beautifully with the time of day and the task at hand.
And it means introducing touches like considered planting - the additions that bring a sense of calm and connection to the natural world into an otherwise urban environment.
These are the elements that don't always make it into the spec sheet, but that occupiers notice immediately - and that quietly shape whether a space feels like somewhere worth coming back to.
And when these layers are designed in from the outset rather than treated as finishing touches, the difference is tangible, creating workspaces that are genuinely a delight to be in.
Sustainability as a long-term asset strategy
For landlords, sustainability has shifted from a reputational consideration to a straightforward, commercial one.
EPC performance, embodied carbon, energy efficiency - these are all material factors now in occupier decisions, asset valuations and financing.
Specifying with longevity and low environmental impact in mind; using materials chosen for their durability as well as their aesthetics, systems designed to adapt rather than be replaced and circular thinking around what stays and what goes - it doesn't just improve credentials on paper, it reduces the frequency and cost of future intervention, which is good for the asset and good for the planet.
And when’s the most cost-effective moment to address these factors?
It’s always at the point of refurbishment, with vacant possession and a clean run at the building fabric and services.
Infrastructure: get it right, then move on
There's a practical reality to any CAT A and CAT A+ fit out that's worth acknowledging: power capacity, connectivity, cabling routes and smart building integration matter to occupiers, and the right time to address them is before a tenant moves in.
Getting the bones right protects the asset's appeal across multiple lettings without costly retrofits between each one - and it might not be the most exciting part of the conversation, but it is the part that makes everything else possible.
Design Tonic X Sovereign House
Is CAT A/A+ worth the investment?
For landlords still weighing the case, the message is consistent: well-specified, design-led CAT A and CAT A+ spaces let faster, command stronger rents and retain occupiers for longer than their lower-spec equivalents.
And viewed across a full investment period?
The logic becomes even clearer.
Lower void costs, reduced re-letting expenditure, stronger asset positioning against tightening legislation and rising occupier expectations — the returns stack up in ways that a less thorough approach simply can't match.
Ready to futureproof your CAT A/A+ fit out?
At Design Tonic, we work with landlords and developers to design and deliver CAT A and CAT A+ spaces that are built to perform - not just on day one, but across the long term.
If you'd like to talk through what that could look like for your next project, our team would love to hear from you - click here to get in touch today.
