Office design in 2026 is being shaped by pressure on cost, speed to occupation, and how effectively space is used. Landlords need to lease faster. Occupiers are scrutinising how their workspace performs day to day. That shift is changing how CAT A, CAT A+ and CAT B fit outs are planned.

Design decisions now carry weight beyond aesthetics. Layout, services, and finishes all influence leasing, retention, and long-term flexibility. The strongest projects are the ones where design intent and delivery constraints are aligned from the outset.

CAT A+ Is Replacing Basic CAT A in Competitive Buildings. Standard CAT A no longer creates enough impact in many buildings. A typical CAT A scheme delivers core infrastructure. Ceilings, lighting, HVAC, and raised access floors. It provides a usable base, but it still leaves tenants facing additional design work, cost, and programme risk before they can move in.
CAT A+ is closing that gap.

Landlords are now delivering fitted, ready-to-use spaces that include meeting rooms, kitchen areas, and a considered design finish. The aim is to reduce the time between viewing and occupation and remove uncertainty for incoming tenants.

The design challenge sits in control. The space needs to feel complete without limiting how it can be used. Neutral finishes, flexible layouts, and carefully selected furniture allow tenants to adapt the space without starting again.

For Base Interiors, CAT A+ requires the same level of coordination as a CAT B fit out. Services, layout, and design need to be resolved early. Treating it as a light upgrade usually creates issues later in the project.

Space Planning Is Now Performance-Led

Office layouts are no longer built around desk density alone. Hybrid working has introduced variation in how and when space is used. Peak occupancy shifts across the week, and teams move between different types of work throughout the day. That has pushed design towards more deliberate space planning.

In CAT B fit outs, layouts are now structured around how people actually work. Desk numbers are reduced in favour of shared workstations, while more space is allocated to collaboration areas, meeting rooms, and quiet zones. The goal is to remove underused areas and improve overall efficiency.

These decisions need to be supported at CAT A level. Services grids, power distribution, and floor layouts must allow for future flexibility. If those elements are fixed too early without considering end use, it limits what can be achieved later. Every part of the space now needs a clear function. And more importantly, it needs to be able to adapt.

Acoustic Design Is Being Addressed at Design Stage

Acoustic performance is now a primary design consideration. Open-plan environments without proper control create distraction and reduce productivity. In many cases, this isn’t picked up until after occupation, when it becomes harder to resolve without disruption.

In 2026, acoustic strategy is built into the design from the start. Ceiling treatments, wall finishes, and spatial zoning are all used to manage sound across the workspace. Enclosed areas for calls and focused work are also becoming standard within CAT B layouts.

These elements rely on early coordination. Ceiling design, services integration, and material choices made at CAT A stage all influence how sound behaves within the space.

Once installed, changes are disruptive and costly. Getting this right early avoids compromise later.

Workspaces Are Taking Cues From Hospitality Environments

Expectations around workplace quality have shifted. Offices are now expected to provide a level of comfort and usability that supports longer, more flexible working patterns. This has led to a more hospitality-led approach to design. Breakout areas are being designed as usable working environments rather than secondary spaces.

Kitchen areas are more integrated and better finished. Lighting is softer and more layered, moving away from purely functional schemes.

This trend sits largely within CAT B fit outs, where the user experience is defined. However, it is also influencing CAT A+ schemes, where landlords are investing more in shared amenities and base finishes to improve building appeal.

The focus needs to stay practical. Materials, joinery, and finishes must be robust enough to handle consistent use without degrading quickly.

Sustainability Is Driving More Informed Design Decisions

Sustainability is now part of the core brief, alongside cost and programme. Clients are placing more emphasis on how materials are used, how systems perform, and how long a fit out will last before requiring major change. This is influencing decisions at both CAT A and CAT B stages.

In refurbishment projects, there is a stronger focus on retaining existing elements where possible. Ceilings, services, and floor systems are being assessed before removal, which can reduce both cost and environmental impact.

At CAT B stage, material selection and furniture specification carry more weight. The emphasis is on durability and lifecycle performance, rather than short-term visual impact. And the key is to balance sustainability with long-term usability. Design decisions need to hold up commercially, as well as environmentally.

Technology Is Being Designed Into the Building Fabric

Technology requirements are increasing, and they’re being addressed earlier in the process.

Reliable connectivity, video conferencing, and smart building systems are now expected as standard. These requirements need to be considered at CAT A stage, where infrastructure can be planned properly.

Power distribution, containment routes, and data provision all need to support a range of future uses. If these elements are overlooked early, retrofitting them later can affect both programme and cost.

At CAT B stage, this infrastructure is translated into working environments. Meeting rooms, collaboration spaces, and individual work areas all rely on it being correctly installed.

Coordination between design, MEP, and technology teams is now essential to avoid rework.

Zoning Is Replacing Uniform Layouts

Uniform open-plan layouts are becoming less common. Offices are now divided into zones that reflect different types of work. Quiet areas, collaboration spaces, and informal meeting points are all planned within the same floorplate.

This approach improves usability and reduces conflict between activities that require different environments. In CAT B fit outs, zoning drives the overall layout. In CAT A and CAT A+, it influences how services are distributed and how adaptable the space will be in the future.

Zoning only works when it is supported by the rest of the design. Acoustics, lighting, and furniture all need to align with how each area is intended to be used.

Design Needs to Align With Approvals and Delivery Constraints

Fit out projects are operating within tighter approval frameworks. Landlord requirements, Licence to Alter agreements, and mechanical and electrical validations all influence how a project progresses. In some buildings, specific systems must be installed by nominated contractors, and work cannot begin until full approval is in place.

These constraints affect both design and programme. For CAT B fit outs, design submissions need to be complete, coordinated, and aligned with landlord expectations. Gaps in information or late changes often lead to delays.

We approach this through early engagement and structured design development. Approval pathways are considered from the outset, which helps keep programmes realistic and avoids disruption during delivery.

Refurbishment Is Being Prioritised Over Relocation

Many businesses are choosing to improve their existing space rather than move.

Refurbishment projects can reduce disruption and allow organisations to upgrade their environment without the cost and complexity of relocation. This is increasing demand for both CAT A upgrades and CAT B reconfigurations.

Working within an existing building requires a detailed understanding of constraints. Services, structure, and access all influence what can be achieved. Design needs to respond to those conditions rather than work against them. Experience in live environments and complex buildings plays a significant role in delivering these projects without delays.

Planning an Office Fit Out in 2026

At Base Interiors, we understand that office design trends are closely tied to how space performs in practice. Layouts need to be efficient. Services need to support flexibility. Finishes need to last.

The difference between a smooth project and a delayed one often comes down to early decisions. When design, approvals, and delivery are aligned in a timely manner, projects move forward with less bottlenecks.

We deliver CAT A, CAT A+ and CAT B fit outs with a clear focus on buildability, compliance, and long-term performance. To discuss your project requirements, get in touch with us today.