Cat A vs Cat B Office Fit Out Guide

Navigating the world of commercial property can often feel like learning a second language. Between “FRI leases,” “dilapidations,” and “heads of terms,” there is a lot of jargon to digest. However, if you are looking for a new workspace or planning an office refurbishment, two terms will appear more frequently than any others: Cat A and Cat B.

Understanding the distinction between a Cat A and a Cat B office fit out is critical. It doesn’t just dictate what the space looks like when you move in; it determines your budget, your timeline, and who is responsible for the bill. At JLH Office Interiors, we’ve spent years helping both landlords and tenants transform empty shells into thriving hubs of productivity.

In this guide, we’ll strip away the complexity and explain exactly what these terms mean for your business.

The Foundation: What is a Cat A Fit Out?

Think of a Cat A fit out as a functional blank canvas. Usually commissioned by a landlord or developer, a Cat A project brings a commercial space up to a basic, leasable standard. It’s the “shell and core” plus the essential services required for a business to operate, but without the personality or specific layout of a finished workplace.

When you walk into a Cat A space, you won’t see desks, meeting rooms, or a branded reception desk. Instead, you’ll see a clean, open-plan environment.

What’s Typically Included in Cat A?

• Raised Access Floors: A level floor surface with space underneath for power and data cabling.
• Suspended Ceilings: Basic grid ceilings that house lighting and ventilation.
• Mechanical and Electrical Services: Essential HVAC (heating, ventilation, and air conditioning), basic lighting, and fire detection systems.
• Basic Internal Finishes: Generally, walls will be plastered and painted white.
• Core Areas: Toilets and basic lift lobbies are usually finished to a high standard.

For a landlord, a Cat A fit out is a strategic investment. It makes the property far more marketable to potential tenants who want to see the potential of the space without being restricted by a previous occupant’s design choices. For you, the tenant, it provides the “skeleton” upon which you can build your dream office.

The Transformation: What is a Cat B Fit Out?

This is where the magic happens. A Cat B office interior fit out takes that blank Cat A canvas and transforms it into a living, breathing workspace tailored specifically to your company’s culture, workflow, and brand identity.

If you are a tenant moving into a new building, the Cat B phase is where you make the space your own. This is where we sit down with you to discuss how your teams collaborate, where you need privacy, and how you want your clients to feel when they walk through the door.

What’s Included in Cat B?

• Internal Partitioning: Creating individual offices, boardrooms, and quiet zones. We often recommend office glass partitions to maintain a sense of space and light while providing acoustic privacy.
• Specialist Facilities: This includes fully fitted kitchens (or “tea points”), breakout areas, and dedicated server rooms.
• Furniture and Workstations: From ergonomic desks to sophisticated boardroom tables and bespoke storage solutions.
• Branding and Decor: Incorporating your corporate colours, logos, and unique wall finishes or floor coverings.
• Enhanced ICT and Lighting: Customising the basic Cat A power and data layout to suit your specific desk configuration and adding feature lighting in reception or social areas.

A Cat B fit out is about more than just aesthetics; it’s about performance. A well-designed office can significantly boost employee well-being and retention. By choosing the right finishes: such as acoustic glass: you can solve common workspace challenges like noise pollution and lack of natural light.

The “Middle Ground”: What is Cat A+?

In recent years, we’ve seen the rise of “Cat A+.” This is a hybrid model often referred to as “plug-and-play” space.

Landlords are increasingly opting for Cat A+ fit outs to attract smaller businesses or startups who want to move in immediately without the capital expenditure of a full Cat B project. A Cat A+ space includes the basics of a Cat B fit out: some partitioning, a kitchen, and basic furniture: but it remains generic enough to suit a variety of different businesses.

While convenient, the downside of Cat A+ for a tenant is the lack of bespoke branding and a layout that might not perfectly align with your specific operational needs.

Cat A vs Cat B: A Quick Comparison

To help you visualise the differences, here is a summary of how the two styles stack up:

Cost Considerations and Financial Planning

One of the biggest questions we get at JLH Office Interiors is: “How much will it cost?”

The truth is that every office refurbishment is unique. However, there are some general rules of thumb. A Cat A fit out is a lower cost per square foot because it deals with bulk materials and basic infrastructure. A Cat B fit out is an investment in your business’s future. While the upfront cost is higher due to the level of customisation and furniture, it is often more cost-effective in the long run than a “DIY” approach.

Pro Tip: If you are a tenant, check your lease agreement for a “Rent-Free Period” or a “Fit-Out Contribution.” Landlords often provide these incentives to help offset the cost of your Cat B works.

If you are planning a project from scratch, combining the Cat A and Cat B delivery can save a significant amount of money. By having one contractor (like our team) manage the entire process, you avoid the “double-handling” of materials and ensure that the HVAC and electrical systems are installed in exactly the right places for your final layout, rather than having to move them later.

Choosing the Right Path for Your Business

Deciding between a Cat A and Cat B approach depends entirely on your position in the property lifecycle.

For Landlords:

Your goal is to reduce “void periods” (the time a property sits empty). A high-quality Cat A fit out demonstrates the potential of your building. If you are struggling to move a space, considering a Cat A+ “plug-and-play” option could be the key to securing a tenant quickly in a competitive market.

For Tenants:

Unless you are taking a short-term serviced office, you will likely need a Cat B fit out. Don’t settle for a generic layout. Your office is a physical manifestation of your brand. Whether it’s through sleek glass partitions or vibrant breakout areas, your space should tell your story.

Why Partner with JLH Office Interiors?

At JLH Office Interiors, we don’t just move walls; we build environments where businesses can thrive. With our deep expertise in office fit out and refurbishment, we guide you through every step of the process: from the initial “shell” stage to the moment you turn the key on your new, branded front door.

Whether you are a landlord looking to modernise a commercial unit or a business owner ready to take your workspace to the next level, our team provides a seamless, professional service. We pride ourselves on our family values, our transparency, and our commitment to high-end finishes.

We understand that an office transformation is a big step. That’s why we focus on practical outcomes: better acoustics, smarter layouts, and designs that actually work for your people.

Ready to start your transformation?
If you have more questions about the fit-out process or want to see how we can bring your vision to life, visit our FAQ page or contact us today for a consultation. Let’s build something brilliant together.