If you're looking at a new office lease, you've probably already bumped into the terms cat a and b fit out and wondered what the real difference is between them. It's one of those industry quirks where everyone talks like you should already know the lingo, but in reality, the line between the two can get a bit blurry. Essentially, we're talking about the stages of "readiness" for a commercial space, and knowing which one you're dealing with—or which one you need—can save you a massive headache (and a lot of money) down the line.
Let's break down the Cat A basics
Think of a Cat A fit out as a blank canvas. If you've ever walked into a brand-new office building and seen nothing but a big, open room with shiny raised floors, white walls, and a grid ceiling, you're looking at a Cat A space. It's functional, but it's definitely not "move-in ready."
Usually, the landlord is the one responsible for the Cat A work. They want the space to look clean and professional so they can show it off to potential tenants. In a typical Cat A setup, you'll find the basic mechanical and electrical services (like AC and lighting) already installed, but they're just there. They aren't tailored to anyone's specific office layout yet. You get the essentials: basic flooring, finished internal walls, and maybe some fire alarms. It's the skeleton of an office.
For a tenant, moving into a Cat A space means you have a lot of work ahead of you, but you also have total control. You aren't fighting against someone else's weird design choices or awkward glass partitions. You get to decide exactly where the boardroom goes and where the coffee machine will live.
Moving into the Cat B territory
Now, this is where things get interesting. A Cat B fit out is where the personality comes in. This is the stage where a business takes that empty shell and turns it into a place where people actually want to work. If Cat A is the house, Cat B is the furniture, the paint on the walls, the kitchen, and the Wi-Fi.
When you go for a Cat B fit out, you're looking at everything from the installation of private offices and meeting rooms to the funky breakout areas and the reception desk. It covers: * Branded signage and color schemes. * Kitchenettes and "tea points" (the heart of any office, let's be honest). * Specialized lighting and IT infrastructure. * Furniture, workstations, and those ergonomic chairs everyone fights over.
The Cat B phase is usually handled by the tenant because it's so specific to how their business operates. An ad agency is going to want a very different Cat B finish than a firm of accountants. It's all about the "vibe" and the workflow.
The rise of the "Plug and Play" (Cat A+)
Lately, there's been a bit of a shift in the market. Landlords have realized that some companies—especially startups or those moving quickly—don't want the hassle of managing a massive construction project before they can start working. This has given birth to "Cat A+," which is basically a hybrid.
In a Cat A+ scenario, the landlord does the heavy lifting of a Cat B fit out but keeps it somewhat generic. You get the desks, the meeting rooms, and the kitchen, but without the heavy branding. You just bring your laptops, plug them in, and you're off. It's great for flexibility, though you might pay a bit more in rent for the convenience.
Why the distinction actually matters
You might be thinking, "Who cares what it's called as long as the office looks good?" Well, your bank account cares. Understanding the cat a and b fit out hierarchy is crucial for negotiating your lease.
If you're a tenant, you need to know exactly where the landlord's responsibility ends and yours begins. If the landlord says the space is "Cat A," but you realize there aren't enough power outlets for your team of 50 developers, that's an extra cost you'll have to swallow during your Cat B phase.
On the flip side, sometimes you can negotiate a "fit out allowance." This is when the landlord gives you a chunk of cash to help cover the costs of turning their Cat A space into your dream Cat B office. If you don't know the difference between the two, you might not even know that's something you can ask for.
The hidden costs of "making it your own"
Let's talk about the stuff no one likes to talk about: the budget. A Cat B fit out is almost always more expensive than people think. It's easy to look at a floor plan and imagine a few desks, but it's the "invisible" stuff that adds up.
Think about the air conditioning. In a Cat A space, the AC is usually just a few big units designed to cool an empty room. Once you start putting up walls for meeting rooms, you have to redirect all that ductwork so people don't suffocate in a 10-person glass box. That's a Cat B cost. Then there's the data cabling, the security systems, and the acoustic dampening so the sales team doesn't distract the legal team.
It's always a good idea to bring in a professional early on. An interior designer or a fit out specialist can look at a Cat A space and tell you straight away if your Cat B dreams are realistic or if they're going to cost a fortune in plumbing redirects.
Which one should you choose?
There's no right or wrong answer here, but it usually comes down to how much time and control you have.
If you're a growing company that wants to build a very specific culture, you probably want to start with a Cat A and do the Cat B yourself. It's more work, sure, but the end result is a space that is 100% "you." You can design the layout to encourage collaboration, or build in quiet zones for deep work. It's an investment in your brand and your people.
However, if you need to move in three weeks and you don't have the bandwidth to pick out carpet tiles and light fixtures, look for a space that's already been through a Cat B fit out (often called "second-hand" space) or a Cat A+ setup. You might have to live with someone else's choice of kitchen cabinets, but you'll be up and running way faster.
The "Dilapidations" trap
Here's a little tip that often catches people out at the end of their lease. Most commercial leases have a "dilapidations" clause. This basically says that when you move out, you have to return the space to the condition you found it in.
If you took over a Cat A space and spent a fortune on a fancy Cat B fit out with custom walls and a mahogany bar, the landlord might make you tear it all down and turn it back into that empty white box before you leave. It feels heartbreaking to destroy a perfectly good office, but that's the law of the land. When planning your cat a and b fit out, always keep an eye on how easy (or expensive) it will be to undo everything in five or ten years.
Wrapping it all up
At the end of the day, an office is more than just four walls and a roof; it's where your team spends most of their waking hours. Whether you're staring at the blank slate of a Cat A space or picking out the finishing touches for a Cat B project, the goal is the same: creating a spot where people can actually get stuff done.
Take your time with the planning. Don't rush into a lease without knowing exactly what "state" the building is in. If you get the balance right between the landlord's shell and your own personal touches, you'll end up with a workspace that doesn't just look good on Instagram, but actually works for your business.