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Interaction

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Sustainable Office Fit-Outs in London

We deliver high-quality, sustainable office fit-outs across London, specialising in CAT A, CAT A+ and CAT B fit-out solutions. With over 30 years’ experience, Interaction is one of London’s leading office design and fit-out specialists. We’ve delivered a wide range of commercial fit-out and refurbishment projects across the capital – working closely with landlords, asset managers and end users to create workspaces that attract tenants, support productivity and deliver long-term value.

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Workspaces built for London

Where we work

We operate across Greater London, including the City, West End, Bloomsbury, Clapham, Shoreditch, Whitechapel and Wandsworth, with designs delivered by our award-winning studio in Bath.

Our teams regularly work from our Shoreditch office so we’re always ready to offer early-stage advice and fresh ideas whenever you need them. Whether you’re refurbishing a workspace in Islington or need a CAT A fit-out in Southbank, we’ve got you covered.

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Our services

We offer a full suite of services tailored to business owners, landlords, flex space operators and developers seeking fast, high-quality delivery with minimum disruption and maximum ROI.

We work with you to create bespoke workspaces that meet your goals and elevate performance.

Interior Design

We craft the character of your office through thoughtful use of colours, materials and furniture, creating spaces that reflect your brand and inspire your team.

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Workplace Consultancy

Processes boost productivity and efficiency. We help you optimise how your teams work through research-led strategy, including surveys, workshops and post-occupancy studies.

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Fitted Spaces

With over 30 years of experience delivering CAT A and CAT B fit-outs in London, we provide end-to-end design and build solutions that stay on time and on budget.

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Sustainable Spaces

We help landlords boost building credentials and businesses create healthier, future-ready workplaces. With in-house SKA assessment, we guide clients from day one. Our sustainable office design approach ensures your London space meets ESG goals while boosting tenant appeal.

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Client Care Services

Our service doesn’t end at handover. Our client care team proactively supports you with maintenance, upgrades, and ongoing solutions to any challenges that arise.

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Why Interaction for your London office fit-out?

We know London’s commercial property market inside and out – and we understand what it takes to deliver standout spaces in this unique and fast-paced environment.

Deep market understanding

London’s office landscape is evolving. With outdated Grade C spaces falling out of favour, today’s tenants demand high-performing, ESG-aligned buildings with strong amenity offerings. We’ve delivered future-proofed fit-outs across the capital, creating compliant, tenant-attractive spaces that enhance property value and occupancy rates.

Reliable high-pressure delivery

From plug-and-play landlord schemes to bespoke tenant fit-outs, we deliver perfection at pace. We’re used to working in occupied buildings and under lease-critical timelines. Our agile teams navigate disruption, streamline programmes, and maintain crystal-clear communication – keeping your project on track from day one.

Strategic stakeholder management

Every project involves multiple stakeholders, from fund managers and asset owners to agents, consultants and tenant decision-makers. Our experienced teams excel at aligning interests, managing risk, and ensuring your commercial objectives stay front and centre.

Why Interaction?

  • Proven track record delivering CAT A, CAT A+ and CAT B spaces across Greater London
  • B Corp certified with strong ESG credentials
  • Known for seamless coordination with agents, consultants, and internal teams
  • Trusted by fund managers, developers, and landlords to deliver high-impact workspaces, fast
 

Certifications and awards

B Corp Certified

Acquired in October 2023, demonstrating our commitment to responsible business practices, sustainability, and long-term impact.

National BCO Award winners

Our project for Osborne Clarke’s Bristol HQ won a national British Council for Offices (BCO) Award – one of the industry’s highest accolades. It’s a great example of the standard we deliver across the UK, including on a growing number of standout projects in London.

example of sustainable office design and build

Case studies

Unlocking London’s full potential

Discover how our office design consultants helped these businesses reach new heights

A modern coworking space with neutral colours and green accents, with statement pendant lighting above

FOUNDRY, Wandsworth

  • Size
    14,000 sq ft
  • Location
    London
  • Sector
    Co-working
  • Type
    CAT B, CAT A+
Communal area with bright orange mural on the wall and cosy sofa

Runway East, Bloomsbury

  • Size
    44,000 sq ft
  • Location
    London
  • Sector
    Co-working
  • Type
    CAT B, CAT A+
A meeting room with large windows, panelled walls and dark oak table

GPE Woolyard

  • Size
    6,000 sq ft
  • Location
    London
  • Sector
    Landlord
  • Type
    CAT B, CAT A+

Discuss your London office fit-out with Charlie

Use the calendar to book a time with Charlie — we’d love to hear your plans and explore how we can bring them to life.

Charlie Moss | Relationships Manager
Email: [email protected]

All general enquiries
Phone: 01225 485 600
Email: [email protected]

Get your office design in London established today.

Latest insights.

We’re passionate about inspirational workspaces, so we’re committed to exploring and sharing the latest and cleverest workplace thinking with you.

Frequently Asked Questions

How to choose an office fit-out company in London?

Choosing the right office fit-out company could make or break your project. Start by identifying your goals and requirements – whether it’s a CAT A, CAT B or turnkey solution. Look for a company with a proven track record in London, relevant certifications, and experience delivering projects of similar scale and complexity. For a more detailed breakdown, explore our Office Fit-Out Guide, or if you’re a landlord, download A Landlord’s Checklist to Choosing the Right Design and Build Firm.

How long does a commercial office design in London take?

The timeline for a commercial office design and fit-out project in London can vary significantly based on the size, complexity, and scope of the work. On average, projects can take anywhere from 6 weeks for a smaller plug-and-play fit-out to some months for a full-scale Cat A or Cat B transformation.

Several factors influence the timeline:

  • Project size and square footage
  • Whether the building is occupied
  • Planning and landlord approvals
  • Sustainability or compliance requirements (e.g. BREEAM, WELL)
  • Design complexity and bespoke elements

At Interaction, we’re built for speed, delivering beautiful, tenant-ready workspaces at pace without compromising on quality. Whether you’re refreshing a 5,000 sq ft space or transforming 50,000 sq ft across multiple floors, we’ll create a tailored programme that meets your deadline, budget, and commercial goals.