Cat A and Cat B Office Fit Out – The Difference

In the area of office design and construction, the concepts of Category A (Cat A) and Category B (Cat B) fit-outs play pivotal roles in transforming empty spaces into vibrant hubs of productivity and creativity. These terms, while common within the industry, carry significant distinctions that can profoundly influence the functionality, aesthetics, and overall feel of an office environment.

At Spectrum Interiors, our expertise in navigating the intricate nuances of office fit-outs allows us to tailor spaces that not only meet but exceed the expectations of our clients. This blog explores the differences between Cat A and Cat B fit-outs, providing insights into how each approach can be optimally leveraged to create bespoke office interiors.

Understanding Cat A Fit-Outs

A Cat A fit-out essentially prepares a space for occupation, installing the basic infrastructure necessary for a functional office. This type of fit-out is often the responsibility of the landlord or property developer and provides a blank canvas upon which a bespoke office environment can be created.

Key Features of a Cat A Fit-Out

  • Basic Finishes: Includes the installation of suspended ceilings, raised floors, and basic mechanical and electrical services.
  • Essential Services: Provision of services such as lighting, heating, cooling, and power outlets in generic locations.
  • Common Areas: May include the fit-out of communal areas such as lobbies, restrooms, and lifts, depending on the agreement with the landlord.


The primary goal of a Cat A fit-out is to make the space habitable and compliant with building regulations, creating a neutral backdrop for further customisation.

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Exploring Cat B Fit-Outs

Contrastingly, a Cat B fit-out takes the foundational elements of a Cat A finish and transforms the space into a fully customised and branded office environment. This stage is typically commissioned by the tenant and focuses on tailoring the space to specific operational, aesthetic, and cultural needs.

Key Features of a Cat B Fit-Out

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  • Bespoke Design: Incorporates company branding, colour schemes, and design motifs to reflect the organisation’s identity.
  • Custom Layouts: Tailors the space for specific uses, including open-plan areas, private offices, meeting rooms, and breakout zones.
  • Furniture and Finishes: Selects and installs furniture, fixtures, and equipment (FF&E) that align with the company’s style and functional requirements.
  • Technology Integration: Implements advanced IT and communications infrastructure, AV systems, and other technological enhancements.

A Cat B fit-out is where a company’s vision for its workspace comes to life, embodying its values, enhancing its brand, and fostering a supportive and inspiring environment for its employees.

The Spectrum Interiors Approach

At Spectrum Interiors, we excel in the art and science of both Cat A and Cat B office fit-outs. Our approach is distinguished by our commitment to understanding the unique needs and aspirations of our clients, coupled with our relentless pursuit of design and construction excellence.

Navigating the Journey from Cat A to Cat B

Our process begins with an in-depth consultation to grasp the essence of your brand and operational requirements. This understanding informs every stage of the fit-out, ensuring that the transition from Cat A to Cat B not only meets but surpasses your expectations.

  • Strategic Planning: We start by assessing the Cat A space, considering how its elements can be optimised or adapted in the Cat B fit-out. Our strategic planning encompasses space planning, design concept development, and compliance with regulations.
  • Design Innovation: Our designers craft bespoke solutions that reflect your brand’s identity and ethos. We focus on creating spaces that inspire creativity, foster collaboration, and enhance productivity, all while ensuring comfort and wellbeing.
  • Project Execution: With meticulous attention to detail, our project management team oversees the fit-out process from start to finish. We coordinate with contractors, suppliers, and stakeholders, ensuring quality control, timeline management, and budget adherence.
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The Spectrum Difference

What sets Spectrum Interiors apart is our holistic view of office fit-outs. We believe that a workspace should not only look exceptional but also function seamlessly, promoting a positive, productive, and sustainable work environment. Our expertise in both Cat A and Cat B fit-outs allows us to guide our clients through the entire process, making informed decisions that bring their vision to life.


The distinction between Cat A and Cat B office fit-outs is fundamental in the world of office design and construction. While Cat A establishes the basic framework of a workspace, Cat B personalises and enhances that framework to reflect the unique identity and needs of a business. At Spectrum Interiors, our approach to these fit-outs is rooted in a deep understanding of our clients’ visions and a commitment to delivering spaces that are not just workplaces, but environments where innovation, collaboration, and well-being thrive. Whether embarking on a Cat A fit-out to create a versatile blank canvas or a Cat B fit-out to realise a bespoke office environment, Spectrum Interiors stands as a trusted partner, dedicated to achieving excellence in every project.

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