Inrichting categorie B versus inrichting categorie A: wat is het belangrijkst voor de gebruikers?

Cat A fit out prepares an office space with the basic finishes and infrastructure needed before a tenant moves in. Cat B fit out takes that space and turns it into a working office, with meeting rooms, furniture, branding, technology, breakout areas and the details that make it suitable for the occupier.

In simple terms, Cat A creates the foundation. Cat B creates the finished workplace.

The difference matters because it affects cost, timings, lease negotiations, employee experience, sustainability and how well the office supports the way people actually work. For occupiers, especially those taking space in London or across several European locations, understanding this early can prevent expensive mistakes later.

A Cat A office fit out is the basic level of finish that turns an empty commercial space into a functional office environment.

It usually includes the essential elements of the building, such as raised access flooring, suspended ceilings, basic lighting, mechanical and electrical services, air conditioning, fire safety systems, lifts, toilets and core communal areas.

A Cat A space is not usually ready for employees to move into. It may look clean and complete, but it still needs the tenant’s layout, furniture, meeting rooms, technology and branding before it becomes a working office.

For landlords, Cat A helps make the space easier to market and lease. For occupiers, it provides the starting point for the next stage of design.

Studio Alliance delivers cat a office fit out projects across London and Europe, helping landlords and occupiers create spaces that are technically prepared, compliant and ready for the next phase of workplace design.

Cat B fit out is the stage where the office becomes specific to the occupier.

It takes the Cat A base and turns it into a complete workplace. This can include workstations, private offices, meeting rooms, collaboration spaces, reception areas, kitchens, breakout zones, acoustic solutions, furniture, IT, AV, lighting design, flooring, signage and brand details.

This is where the workplace starts to reflect the company using it.

A cat b fit out is usually the stage occupiers care about most because it affects how people use the office every day. It shapes how teams meet, focus, collaborate, welcome clients and feel when they come into work.

Good Cat B design should not just look impressive. It should make the space easier to use.

For occupiers, the difference between Cat A and Cat B is not just a technical point. It has a direct impact on the project budget, move-in date and quality of the final workplace.

If you take a lease on a Cat A space, you may still need a full Cat B project before your team can move in. That can include design work, furniture, technology, meeting room installation, tea points, branding, storage, acoustic treatments and final finishes.

If you take a space with an existing Cat B fit out, you need to understand what can be reused, what needs to be changed and what may need to be stripped out. A space may look finished but still be wrong for your team.

This is why it helps to involve workplace and fit-out specialists before the lease is signed. They can review the space, identify risks and help you understand the real cost of occupation.

Studio Alliance has also written a useful guide on the difference between Cat A and Cat B fit out, which explains how the two stages compare in more detail.

Before deciding how much Cat A or Cat B work is needed, occupiers should start with a simple question: what does the office need to do for the business?

That sounds obvious, but it is often missed.

An office may need to support hybrid working, client meetings, focused work, training, social connection, brand experience or all of these at once. The right fit-out route depends on how the space will be used in real life.

A law firm, creative agency, technology business and financial services company may all need offices in the same city, but the right layout and specification could be completely different for each one.

The starting point should always be the people using the space.

1. Timings and move-in dates

Time is often one of the biggest pressures for occupiers. If your current lease is ending, your team is growing or a new location needs to open by a fixed date, the fit-out programme becomes critical.

A Cat A office gives you a clean base, but it still needs design, approvals, procurement and delivery before occupation. A space with some existing Cat B elements may appear faster, but only if those elements actually suit your needs.

Occupiers should ask:

• What is already included in the space?
• What needs to be removed or changed?
• Are landlord approvals needed?
• Are there long lead-time items such as furniture, AV or specialist finishes?
• Is the building infrastructure suitable for the planned layout?

The British Council for Offices’ Guide to Fit Out highlights the need for office interiors to respond to changing work trends, wellbeing and environmental expectations. That is a useful reminder that fit out is not just about finishing a space quickly. It is about getting the workplace right.

2. Kosten- en budgetbeheersing

Cat A can look simple at first, but occupiers need to understand the full cost of making the office ready to use.

A space may have lighting, flooring and core services, but it may still need upgraded power, new meeting room infrastructure, better acoustic treatment, extra data points, kitchen areas, partitions, furniture and AV.

Cat B costs are often more visible because they include the elements people can see and use. But they can also increase quickly if the scope is not controlled.

The best approach is to look at total project cost. Not just the cost of the Cat A works or the Cat B works in isolation.

A realistic budget should include:

• Design and consultancy fees
• Surveys and technical checks
• Landlord approvals
• Mechanical and electrical changes
• Furniture
• IT and AV
• Branding and signage
• Staff move costs
• Onvoorziene
• Reinstatement obligations at lease end

This is especially important for businesses planning a cat a office fit out London, where property costs are high and decisions made early can have a major impact on the final project cost.

3. Lease obligations and landlord approvals

Fit out and lease terms are closely linked. Occupiers should understand what they are allowed to change, what approvals are needed and what they may have to remove at the end of the lease.

Some leases require the tenant to return the space to its original condition. This is known as reinstatement. If the Cat B fit out is highly bespoke, that could create additional cost later.

Other leases may include rent-free periods, landlord contributions or fit-out allowances. These can make a big difference to the commercial case for the project.

There may also be sustainability clauses. Green leases are becoming more common as landlords and occupiers look for ways to reduce energy use, waste and carbon impact. The Better Buildings Partnership Green Lease Toolkit is a useful source for understanding how landlords and tenants can work together on this.

Before signing, occupiers should be clear on:

• The condition of the space at handover
• What works are permitted
• Who approves the design
• Who pays for each part of the work
• What must be removed at the end of the lease
• Whether there are sustainability requirements in the agreement

These details can affect the whole project.

4. Hybrid working and how the office is used

Hybrid working has changed what people expect from the office. Many employees no longer come in just to sit at a desk. They come in for meetings, collaboration, training, mentoring, client work and time with their team.

Volgens de Office for National Statistics, 28% of working adults in Great Britain were hybrid working between January and March 2025. The CIPD also continues to report that flexible and hybrid working affects performance, engagement and wellbeing.

This matters for Cat B design.

A layout built around fixed desks may not support a business where office attendance changes throughout the week. Equally, an office with too many open collaboration areas may frustrate people who need quiet space to focus.

Occupiers should think about:

• How many people are in the office on peak days?
• Which teams need to sit near each other?
• How many meeting rooms are needed?
• Are there enough quiet rooms?
• Is there enough space for informal collaboration?
• Does the office give people a reason to come in?

Een sterke cat b office fit out should be based on how people work now, not how they worked five years ago.

5. Employee wellbeing and productivity

A good office needs to do more than look professional. It needs to support comfort, focus and daily performance.

Poor lighting, bad acoustics, uncomfortable temperatures and cramped layouts can all affect how people feel and work. The Gezondheids- en veiligheidsfunctionaris provides guidance on workplace factors such as lighting, thermal comfort, working space, noise and vibration.

These are not small details. They can make the difference between a workplace people enjoy using and one they avoid.

Cat B fit out should consider:

• Lichtkwaliteit
• Akoestisch comfort
• Desk spacing
• Luchtkwaliteit
• Temperatuurregeling
• Access and movement through the space
• Stille zones
• Sociale ruimtes
• Inclusief ontwerp
• Beschikbaarheid van vergaderruimtes

The best workplace design balances practical needs with human needs. It should help people do their work well without adding friction to their day.

6. Sustainability and reuse

Sustainability is now a major part of workplace decision-making.

Fit out can involve a lot of material, transport, waste and energy. Stripping out a usable office and replacing everything from new can be expensive and wasteful.

De Britse Green Building Council encourages a move away from a take, make and waste approach towards circular economy thinking. In office fit out, that means looking at reuse, adaptability, material choices and long-term flexibility.

Occupiers should ask:

• Can existing furniture be reused?
• Can partitions or flooring be retained?
• Can the design be adapted in future?
• Are materials responsibly sourced?
• Can waste be reduced during the project?
• Is the Cat A specification likely to be removed during Cat B works?

Cat A and Cat B decisions both affect sustainability. If the Cat A space is fitted out in a way that does not suit the future tenant, parts of it may be stripped out shortly afterwards. That creates avoidable waste.

Early planning between landlord, occupier and fit-out team can reduce this risk.

7. Brand, culture and client experience

Cat B is where brand and culture come into the office.

This does not mean filling the space with logos. It means creating an environment that feels right for the people, clients and visitors using it.

For some businesses, that might mean a polished client suite with private meeting rooms and a strong reception experience. For others, it might mean open project areas, flexible collaboration settings and relaxed breakout spaces.

The right Cat B fit out should reflect the way the business wants to work and be seen.

This is particularly important for occupiers planning a cat b office fit out London, where the office often plays a role in recruitment, retention, client meetings and brand perception.

In a competitive market, the workplace can help show who the business is.

London occupiers often have to balance high space costs, complex lease terms, staff expectations and tight project programmes.

A well-planned Cat A space can make the next stage easier. A poor Cat A specification can create rework, delays and waste. A strong Cat B fit out can help businesses make better use of every square foot.

For London projects, occupiers should be especially careful with:

• The quality of the base specification
• Existing building services
• Planning and building control requirements
• Landlord approval periods
• Access for contractors
• Furniture and material lead times
• Toekomstige flexibiliteit
• End-of-lease obligations

Getting advice early can save time and money.

Studio Alliance brings together workplace experts across London and Europe, supporting clients with office design, fit out, refurbishment, workplace consultancy, digital transformation and change management.

This is useful for occupiers planning a single office, but it is especially valuable for businesses managing projects across different cities or countries.

A business may need a London office, a Dublin office and a Milan office to feel consistent, while still respecting local rules, suppliers, codes and ways of working. Studio Alliance’s model combines local expertise with wider European coordination, helping occupiers avoid a fragmented approach.

Whether the project is Cat A, Cat B or a wider workplace transformation, the aim is simple: create offices that are practical, well delivered and ready for the people using them.

Before starting a project, occupiers should ask:

• What does the office need to do for the business?
• How will people use the space during a normal week?
• What is already included in the building?
• What needs to be added, changed or removed?
• What is the full cost before move-in?
• What approvals are needed?
• What are the lease obligations?
• Can existing materials or furniture be reused?
• How flexible does the space need to be?
• What will make the workplace successful after move-in?

These questions help keep the project focused on the right outcome.

What is the main difference between Cat A and Cat B fit out?

Cat A fit out prepares the basic office space. It usually includes core services, flooring, ceilings, lighting and essential building systems. Cat B fit out turns that space into a finished workplace with furniture, meeting rooms, branding, IT, AV, kitchens and staff areas.

Is Cat A fit out ready to move into?

Usually, no. A Cat A office may look clean and complete, but it is not normally ready for employees to use day to day. Most occupiers still need Cat B works before moving in.

Who pays for Cat A and Cat B fit out?

Cat A is often delivered by the landlord, but this depends on the lease and the condition of the space. Cat B is usually paid for by the occupier because it is tailored to their specific workplace needs.

Do occupiers always need a Cat B fit out?

In most cases, yes. Unless the office already has a suitable existing fit out, occupiers usually need Cat B works to make the space practical, branded and ready for staff.

Can an existing Cat B fit out be reused?

Yes, if it suits the occupier’s needs. Reusing existing furniture, partitions, flooring or meeting rooms can reduce cost, shorten the programme and improve sustainability. But the space still needs to be checked carefully before making a decision.

What should London occupiers consider before starting a fit out?

London occupiers should look closely at the lease terms, landlord approvals, base building specification, project timings, budget, sustainability goals and end-of-lease obligations. These factors can have a major impact on the success and cost of the project.

Cat A and Cat B are not just industry labels. They shape how much you spend, how quickly you can move, how your people experience the office and how well the space supports your business.

Cat A gives you the foundation. Cat B creates the working environment.

For occupiers, the most important thing is understanding what you are taking on, what you need to add and how each decision affects cost, time, sustainability and long-term value.

The best office is not always the most expensive or the most visually striking. It is the one that fits the organisation, supports the people inside it and gives the business room to adapt.