Office Grading Systems Explained: What’s Current and What Might Change

If you’ve ever searched for office space or planned a workplace move, you’ve likely come across terms like Cat A, Cat B and even Cat A+. These grading systems are widely used across the UK commercial property market, but they’re not always clearly understood.

Put simply, office grading systems define how “finished” a workspace is when it’s handed over to a tenant. Understanding them is key to making informed decisions about cost, timelines and how much control you’ll have over your environment.

What Are Office Grading Systems?

Office grading systems are used to classify the condition and level of completion of a commercial workspace. They help landlords, agents and tenants align expectations before a lease is signed.

At a high level, the categories represent a spectrum, from empty, functional spaces to fully designed, move-in-ready environments. The most common classifications in today’s market are Cat A, Cat A+ and Cat B.

Cat A: The Blank Canvas

A Cat A office is essentially a ready-to-lease space with the basics in place, but little else. It provides the infrastructure required for occupation without any customisation.

Typically, a Cat A fit-out includes:

• Raised access flooring
• Suspended ceilings
• Basic lighting
• Heating, ventilation and air conditioning (HVAC)
• Fire safety systems

This type of space is often described as a “blank canvas”. It gives tenants full flexibility to design the office around their needs, but it also means additional time and investment are required before the space becomes fully usable.

Cat A tends to suit businesses that want complete control over layout and branding, or those planning a phased office development.

Cat B: Fully Customised Workspaces

At the other end of the spectrum is Cat B. This is where a workspace becomes a fully functioning office tailored to a specific business.

A Cat B fit-out typically includes:

• Meeting rooms and private offices
• Workstations and furniture
• Branding and décor
• Kitchens and breakout areas
• IT infrastructure and AV systems

Unlike Cat A, this level of fit-out reflects a company’s identity and working style. It’s designed for immediate use, with everything in place from day one.

For organisations prioritising employee experience, culture and productivity, Cat B is often the preferred choice. However, it comes with higher upfront costs and longer lead times.

If you’re planning a workspace transformation, understanding the difference between Cat A and Cat B office fit out options is crucial for balancing budget, speed and design control.

Cat A+: The Middle Ground

In recent years, Cat A+ has emerged as a popular alternative. Sitting between Cat A and Cat B, it offers a partially fitted, ready-to-use office without full customisation.

A Cat A+ space may include:

• Pre-built meeting rooms
• Basic furniture and workstations
• Kitchen facilities
• Lighting and power
• IT infrastructure

These spaces are often described as “plug and play” offices. They allow businesses to move in quickly, with minimal setup required, while still leaving room for light personalisation.

Cat A+ is particularly attractive to start-ups, growing companies or organisations needing flexibility without committing to a full bespoke fit-out.

What’s Driving Change in Office Grading?

While Cat A, Cat B and Cat A+ remain the industry standard, the way they’re used is evolving. Several key trends are shaping the future of office grading systems.

1. Demand for Flexibility

Hybrid working has changed how businesses view office space. Companies now want environments that can adapt quickly rather than fixed layouts tied to long-term needs.

This shift is pushing demand for Cat A+ and flexible fit-outs that reduce commitment while maintaining usability.

2. Speed to Occupation

Time is becoming just as important as cost. Businesses increasingly want to move in quickly, without lengthy design and build phases.

As a result, landlords are investing more in ready-to-use spaces that sit between traditional categories.

3. Landlord-Led Fit-Outs

Historically, Cat B fit-outs were driven by tenants. Now, landlords are taking a more proactive role, offering higher-spec spaces upfront to attract occupiers.

This is blurring the lines between categories and making grading less rigid than it once was.

4. Sustainability and Smart Design

Modern office spaces are expected to meet higher environmental and technological standards. From energy efficiency to smart systems, these features are becoming part of baseline expectations rather than optional extras.

This could lead to new classifications in the future, reflecting not just fit-out level, but performance and sustainability credentials.

What Might Change Next?

Looking ahead, office grading systems are likely to become more fluid. Rather than strict categories, we may see more bespoke descriptions that reflect how spaces are actually used.

Terms like “fully managed”, “flex workspace” and “plug-and-play” are already becoming more common, especially in urban markets.

In practice, this means businesses will need to look beyond labels and focus on what a space offers, from functionality and flexibility to long-term value.