Who Are The Top-Rated Office Fit Out Contractors In London?
Are you moving into a new office space or considering an office refurbishment of your existing space? It’s vital to find the best office fit out contractors that fit with your business’s unique needs.
The office fit out process has many moving parts, including planning, interior design, project management and construction. That’s why it’s important to work with teams of experienced professionals.
It’s so important to find the right partner to create your ideal workspace in London. A working environment that promotes productivity, supports wellbeing, functions efficiently and reflects your brand identity. And that’s just for starters!
We’re here to help you find the best office fit out contractor for your business.

Photography by Matt Sprake of www.mattsprake.co.uk
What is an office fit out?
An office fit out isn’t a simple makeover comprising a fresh coat of paint and a reconfiguration of office furniture. The office fit out process is a comprehensive transformation. It converts a bare commercial space into a fully functional workplace tailored to a business’s needs. It involves everything from structural changes and partitioning to installing electrical systems, lighting, IT infrastructure, furniture and finishes.
What factors should you consider when choosing an office fit out company in London?
Your workplace design and functionality needs to work as hard as you do. It’s important to get it right. You need to partner with the best office fit out contractors to ensure you get the results you want. These are essential factors to consider when selecting your contractor:
1. Experience and expertise
You need to trust that your contractor knows what they’re doing and is capable of doing a great job.
Assess their experience in projects similar to yours. It helps if they have extensive experience and the specific expertise to meet your needs. An experienced contractor will navigate challenges efficiently and provide insights that add value to your project.
2. Testimonials and references
Review their past projects and check client testimonials. This provides a glimpse into the contractor’s capability to deliver on promises and adapt to various design requirements.
3. Project management skills
Effective project management ensures delivery on time and within budget. Ask about timescales, processes and how they handle unforeseen issues (something always arises!).
4. Compliance and certifications
Which qualifications, accreditations and certifications do they hold? They’re a mark of quality assurance. You also need to be sure that they’re across building regulations. This safeguards against legal complications and ensures quality standards.
5. Sustainability practices
If your organisation has environmental targets and values eco-friendly practices, that needs to be a key consideration in your office design and fit-out. Look for contractors who prioritise sustainability and employee wellbeing.
6 of the best office fit out contractors in London
We have extensive experience in electrical fit out projects for offices in London. We recognise quality contractors when we see them. These contractors provide exemplary office fit out services in and around London.
Overbury
Overbury execute exceptional office fit out and refurbishment projects. Their reliable teams are easy to work with and consistently deliver the highest quality service for offices, higher education and science facilities around London.
Their 91% net promoter score speaks volumes about their high levels of customer satisfaction. The Overbury teams have provided high quality office fit-out projects for global brands like GSK, Rabobank and Condé Nast.
BW Interiors
BW Interiors pride themselves on being workplace experts. They understand the important role that office space plays in allowing working cultures to flourish. Great office design positively affects the ways teams collaborate together, communicate and create quality work.
BW values innovation, inclusivity and net zero. This is reflected in their high profile projects for renowned organisations like Virgin Media, O2 and Sony Music.
Ardmore
With almost 50 years’ experience, Ardmore’s responsible for some of the UK’s most significant residential, commercial and hotel projects. Their extensive experience and in-house technical and engineering expertise ensures that your fit out project’s in safe hands.
Ardmore expertly transformed the historic Old War Office in Whitehall into a luxury Raffles hotel. They’re also delivering a low-carbon retrofit of 5 Chancery Lane, and are responsible for the transformation of The Ned Hotel and Chelsea Barracks. Their traditional, hands-on approach to construction makes them a trusted business to partner with on your office relocation or fit out.
Walter Lilly
With 100 years of heritage, Walter Lilly has extensive experience and expertise. They’ve forged strong partnerships with world-class designers, artisans and architects.
Their impressive portfolio includes landmark listed buildings and cutting edge modern facilities. They’ve been trusted to restore historic buildings including the Palace of Westminster and Southwark Cathedral. They’re also highly regarded in the science and education sectors, delivering outstanding projects for Imperial College London, The London Institute of Medical Sciences and Kingston University to name but a few.
LJJ
LJJ specialise in the design installation and commissioning of mechanical and electrical services. They have over 20 years experience spanning commercial, industrial, public sector and retail projects.
Professional and friendly, LJJ have successfully completed work on London buildings as diverse as The Design Museum, Ham Yard Hotel and The Ink Rooms in Clerkenwell.
Collins Construction
For nearly 70 years, Collins Construction has been providing superb refurbishment and fit out services to owners and occupiers. They work on projects from £50,000 to £30 million within the commercial office, healthcare, education, student accommodation and leisure sectors.
Recent projects range from a 3,750 sq ft fully fitted office space in Aldersgate for Legal and General to a high quality Cat B fit out of office space in Mayfair for the Crown Estate.
FAQs
What are the different types of office fit out project?
They’re generally divided into Cat B and Cat A fit out projects. Discover the difference.
What does a London office fit out cost?
Each project is unique and requires a tailored plan and service. The cost will vary greatly between a 10,000 sq.ft. office space or a multi-floor corporate HQ. Ask your contractor for a bespoke quote.
What’s involved in a commercial electrical fit out project?
We have extensive experience in commercial electrical fit out services. Each project’s unique and driven by your specific business needs. It could be installing the essential infrastructure such as basic electrical wiring, power distribution, lighting and air conditioning. Or if you want bespoke signage, security systems, HVAC controls, sophisticated data cabling and telecommunications – we can sort that out for you too.
Case study: 33 Kingsway, London
We at Prolec Electrical Services recently delivered a full-scale Cat B fit-out at the prestigious 33 Kingsway in Central London. Working in partnership with leading fit-out specialists Artemis Interiors, we were responsible for the full suite of electrical and data services. This project reflects our commitment to enhancing workspace functionality through smart, efficient and future-proofed electrical solutions.

Photography by Matt Sprake of www.mattsprake.co.uk
Choose Prolec for your next electrical fit out project
Whether you’re moving into a new office or commercial workspace or planning a refurbishment, we can provide high quality electrical fit-out services.
With years of experience and an exemplary track record in providing high quality electrical services, you can trust our experienced team of NICEIC approved electrical engineers. We design, install and maintain electrical systems for commercial premises, from high end commercial office spaces to data centres and historic buildings.
Every fit out project has unique needs. We pride ourselves on collaborating with you to find the best solutions for you. You have a single point of contact who’s firmly focused on providing what you need. Contact us to discuss your office fit out project.