If you are planning a new office, refurbishing an existing space, or taking on a commercial lease, you may come across the term Cat B fitout. It is a common phrase in commercial construction, but for many tenants, it is not immediately obvious what it includes or how it differs from other fitout stages.
A Cat B fitout is the stage where an empty or partially prepared commercial space is turned into a finished, functional workplace ready for your team to use. This usually includes the practical and visual elements that make the space work for your business, such as partition walls, meeting rooms, flooring, lighting, workstations, kitchens, branding features and other finishes.
For businesses moving into a new tenancy, the Cat B fitout is often the part that shapes how the office feels, functions and supports day-to-day operations.
What Does a Cat B Fitout Include?
A Cat B fitout can vary depending on the size of the tenancy, the type of business and the brief, but it commonly includes:
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Internal partitioning and office walls
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Meeting rooms and breakout spaces
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Flooring finishes such as carpet tiles or vinyl
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Ceilings and feature lighting
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Joinery, kitchens and utility areas
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Workstations and office furniture
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Power, data and communications setup
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Branding elements and signage
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Acoustic treatments
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Painting and finishing touches
In short, this is the stage that takes a space from a blank canvas to a workplace your staff and visitors can actually use.
How Is a Cat B Fitout Different From a Cat A Fitout?
A Cat A fitout usually delivers the base building interior in a more generic, ready-for-lease condition. It may include essentials such as ceilings, lighting, HVAC, fire services and basic finishes, but it does not fully tailor the space to the needs of the incoming tenant. SB Projects already explains Cat A fitouts as part of its office fitout and design-and-construct offering.
A Cat B fitout is the next step. It is more customised and focused on how your business will actually occupy the premises. This is where the layout, functionality and visual identity come together.
A simple way to think about it is:
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Cat A = base level commercial interior
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Cat B = customised, move-in-ready workplace
Why Cat B Fitouts Matter
A well-planned Cat B fitout is not just about appearance. It affects how people work in the space every day.
A quality fitout can help improve:
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Workflow and team collaboration
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Privacy and acoustic control
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Staff comfort and wellbeing
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Client perception and brand presentation
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Efficient use of available floor space
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Long-term flexibility as your business changes
Because the Cat B stage is where most tenant-specific decisions are made, it is also where thoughtful planning can make a major difference to cost control, programme and final usability.
What Types of Businesses Need a Cat B Fitout?
Cat B fitouts are common across a wide range of commercial spaces, including:
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Corporate offices
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Medical and consulting suites
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Labs and specialist environments
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Hospitality venues
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Professional service offices
SB Projects positions itself as a Sydney fitout specialist across office, medical, lab and hospitality projects, with an end-to-end design and construct process from concept through to handover.
What Should Be Considered Before Starting a Cat B Fitout?
Before construction begins, it is important to think through how the space will be used. Some of the key considerations include:
Team Size and Workflow
How many people need to work in the space now, and how many may need to fit in later? The layout should support both current operations and future growth.
Client Experience
If customers, patients or visitors regularly attend your premises, the front-of-house experience matters. Reception design, waiting areas and meeting rooms should reflect your brand and service offering.
Services and Infrastructure
Power, lighting, data, storage and amenities all need to support the way your business operates. These details can have a big effect on performance once the office is in use.
Budget and Programme
A fitout should be well scoped from the start so you can balance quality, design intent and cost. SB Projects emphasises feasibility, preliminary costing and single-point accountability as part of its process, which is especially important when managing commercial fitout budgets.
Is a Cat B Fitout Custom Designed?
In most cases, yes. A Cat B fitout is usually tailored to the tenant rather than delivered as a one-size-fits-all package.
That does not mean every project needs to be overly complex. Some businesses need a practical, efficient office with a few enclosed rooms and a kitchenette. Others want a more refined workplace with custom joinery, branded finishes, collaborative zones and specialised rooms.
The right solution depends on your operational needs, budget and goals for the space.
Why Work With an Experienced Fitout Builder?
Cat B fitouts involve many moving parts, including design, approvals, trades, services coordination, finishes, furniture and handover. A builder with strong project management can help reduce delays, avoid budget surprises and keep the job moving smoothly.
SB Projects promotes a tailored project management approach, transparent costing and a design-and-construct methodology aimed at delivering fitouts on time and on budget across Sydney.
Final Thoughts
A Cat B fitout is the stage that transforms a commercial tenancy into a completed workspace designed around your business. It is where layout, finishes, services and functionality come together to create a space your team can actually use.
Whether you are fitting out a new office, refreshing an existing workplace or planning a move into a commercial tenancy, understanding the Cat B stage can help you make better decisions early and create a more practical result in the long run.
If you are planning a commercial fitout in Sydney, working with an experienced fitout team can make the process far more straightforward from concept and costing through to construction and handover.
