How to Choose an Office Fit Out Company in London (2026)

An office fit-out company is a contractor that builds, and often designs, the interior of an office, from partitions, ceilings and services to furniture and finishes.

Choosing a fit-out contractor is one of the biggest decisions in an office project. The right partner delivers on time and on budget with little disruption; the wrong one can leave you with delays, variations and a space that doesn’t work. London has a large and competitive fit-out market, from small refurbishment specialists to national design-and-build firms. This guide gives you a practical way to shortlist and compare them.

Decide how you want to procure

Design and build: one company designs and builds, giving you a single point of responsibility and often a faster start. Traditional: you appoint designers and consultants first, then tender the construction to contractors, which gives more design control and competitive pricing on a fixed design but more interfaces to manage. Construction management is mostly used on large, complex projects. For most small and mid-sized London offices, design and build is the most common route.

Match experience to your project

Ask for case studies that resemble your project in size, budget, building type and sector, ideally in London buildings with similar landlord rules. A contractor experienced with City or Canary Wharf estates will understand loading restrictions, out-of-hours working and estate approvals. Ask to visit a completed project and speak to the client.

What accreditations and insurance should you check?

• Health and safety: schemes such as CHAS, SafeContractor or Constructionline show a contractor’s health and safety arrangements have been independently assessed.
• ISO certifications: ISO 9001 (quality), ISO 14001 (environmental) and ISO 45001 (health and safety management) indicate formal management systems.
• Workforce: ask whether site operatives hold CSCS cards.
• Insurance: public liability, employer’s liability and, where the contractor designs, professional indemnity insurance. Ask for certificates and check the limits suit your project.
• Financial standing: check accounts at Companies House and consider asking for a parent company guarantee or performance bond on larger projects.

Understand their CDM approach

Under the Construction (Design and Management) Regulations 2015, you as the client have duties, including making suitable arrangements for managing the project and appointing a principal designer and principal contractor where more than one contractor is involved. Ask contractors how they will fulfil the principal contractor role, how they plan health and safety, and how they will produce the construction phase plan and the health and safety file at handover.

How do you compare fit-out quotes?

Give every contractor the same brief, drawings and specification so quotes are comparable. Then check:

• Scope and exclusions: what is not included, such as furniture, IT, AV, landlord fees or out-of-hours premiums.
• Provisional sums: allowances for items not yet designed. Large provisional sums make a quote look cheaper than it may end up.
• Preliminaries: site management, welfare and logistics costs.
• Programme: a realistic timeline with key milestones and lead times.
• Assumptions about access, working hours and the condition of existing services.

Use published benchmarks to sense-check prices. Our cost per sq ft guide shows current London ranges. A quote far below benchmark often has gaps in scope.

Agree the contract

Most fit-outs use a recognised standard form, such as a JCT contract, rather than a contractor’s own terms. Key points to agree include the contract sum, payment terms, retention, how variations are priced and approved, completion date and damages for delay, defects period and warranties. Take professional advice before signing on larger projects.

Communication during the project

Agree at the start how you will be kept informed: who your day-to-day contact is, how often progress meetings happen, and how cost reports and programme updates are shared. Regular, written updates on variations and their cost help avoid surprises at the final account stage.

What are the red flags?

• Reluctance to provide insurance certificates, accreditations or references.
• Pressure to sign quickly or pay large deposits upfront.
• Vague quotes with few line items and many exclusions.
• No clear answer on who will manage the site day to day.
• Unwillingness to engage with your landlord’s requirements.

Think about the whole life of the space

The cheapest fit-out is not always the best value. Ask contractors about the durability of finishes, the running costs of lighting and air conditioning, how easily the layout can be adapted as your team changes, and what your reinstatement liability will be when the lease ends. A contractor who raises these points unprompted is usually thinking about your interests, not just the contract.

Questions to ask at interview

• Who will be our project manager and site manager, and can we meet them?
• What similar London projects have you delivered in the last two years?
• How will you handle the landlord’s licence for alterations and building control?
• How do you manage variations and keep us informed on cost?
• What is your defects and aftercare process after handover?
• Which elements will you subcontract, and to whom?

After handover

A good contractor’s involvement does not end on completion day. Expect a snagging list to be agreed and closed out, operating and maintenance manuals, the health and safety file required under CDM, warranties for equipment and finishes, and a defects period during which the contractor returns to fix problems. Ask at interview how they handle aftercare, how quickly they respond to defects, and whether they offer ongoing maintenance.

Shortlisting made simpler

Finding and vetting contractors takes time. You can send your brief through our matching service and we will pass it to one vetted London contractor suited to your size, location and timescale, so you can start with a qualified conversation. Read more about office refurbishment in London and Cat A vs Cat B fit-outs.

Frequently asked questions

Sources and further reading

Official guidance and registers relevant to this guide (checked 4 October 2026):

• HSE: Construction (Design and Management) Regulations 2015 (hse.gov.uk)
• GOV.UK: Building Regulations approval (gov.uk)

Related guides

• Office Fit Out Cost per Sq Ft in London (2026)
• Cat A vs Cat B Fit Out: What’s the Difference?
• Cat A Fit Out in London: What’s Included and What It Costs (2026)
• Office Dilapidations in London: A Tenant’s Guide
• Office fit-out and refurbishment across London: areas we cover

This guide is general information for office occupiers, not professional cost, legal or construction advice. Costs are published benchmarks and will vary with your building, specification and programme. Always get a detailed quote and take professional advice on your lease and statutory duties.