In the market Understanding Office Leasing Terms: A Simple Guide to London Workspaces

Making sense of the terms behind London’s office market.

For anyone new to office leasing in London, the terminology can be confusing. CAT A, CAT B, fit-out, specification, plug and play, arguably it can all sound unnecessarily technical. Yet these terms define how an office looks, feels and functions, and understanding them is key to finding the right workspace for your business.

At Rubix, we believe in clarity and simplicity. This guide breaks down the jargon behind London’s premium office spaces so you can make confident, informed choices.

CAT A, CAT B and CAT A+ Explained

One of the most common questions we hear when tenants begin their London office search is about “CAT” categories.

• CAT A refers to a basic, ready-for-fit-out space. It typically includes raised floors, suspended ceilings, lighting, air conditioning and fire safety systems. It is a clean, blank canvas ready for personalisation.
• CAT B describes a fully fitted and furnished office. It includes meeting rooms, breakout spaces, kitchens, furniture and décor that reflects your brand identity.
• CAT A+ sits between the two and has become increasingly popular in the London market. These spaces are fully fitted and furnished, with Wi-Fi and utilities already installed. Often described as plug-and-play offices, they are ready to move into immediately and ideal for businesses wanting a quick, stylish and stress-free start.

Fit-Out and Specification

A fit-out covers everything that transforms an empty space into a functioning workplace. It can include the layout, lighting, joinery, flooring, furniture and finishes. The specification describes the quality of those finishes and systems.

Grade A offices in London are built to the highest specification. They feature advanced air systems, sustainable materials and premium design details. These offices often occupy landmark buildings and appeal to tenants who want an impressive workspace that aligns with modern business standards.

Serviced Offices and Flexible Leasing

When exploring offices to rent in London, you will often see terms like serviced, managed or traditional lease. While they can sound similar, they offer different levels of flexibility and involvement.

Serviced offices are fully equipped and managed by an operator. Furniture, internet, cleaning and utilities are all included in one monthly cost. This makes them perfect for teams that value simplicity, flexibility and speed of move-in.

Traditional leased offices provide more control. You take on the space directly from the landlord and can customise the fit-out to your brand and layout preferences. Although the setup time is longer, many established businesses prefer this approach for its stability and long-term value.

At Rubix, we focus on curating the best serviced and leased offices in London, ensuring every space combines design, convenience and flexibility.

Terms You Should Know

Understanding key office rental terms can make your search far easier.

• Lease length: The duration you commit to the space.
• Break clause: An agreed point in the lease where you can exit early, offering flexibility.
• Service charge: The contribution you pay for shared building costs such as cleaning, maintenance and security.
• Business rates: A local tax on commercial properties, set by the council.
• Amenities: On-site features like gyms, cafés, bike storage or roof terraces that add value to your day-to-day experience.

The Modern Office Experience

Today, the most sought-after London office spaces are about much more than square footage. They combine work and lifestyle, helping people integrate their daily routines into their working week.

Tenants are looking for offices near their favourite fitness studios, independent coffee shops and after-work bars. They want spaces that make coming into the office enjoyable, social and inspiring. Buildings with strong amenities and a sense of community attract professionals who want more from their workday than just a desk.

The Rubix Perspective

The London office market does not need to be complicated. At Rubix, we simplify the process by offering curated workspaces that balance design, functionality and flexibility. Whether you are searching for a Grade A serviced office, a CAT A+ plug-and-play space or a long-term London lease, we guide you through every step with clarity and confidence.

Because choosing an office should not feel overwhelming, it should feel like the next chapter.