How to Choose a Commercial Building Contractor in Medway (2026 Guide)

By the Meridian Contractors team, Chatham. Last updated September 2026.

TL;DR: When choosing a commercial building contractor in Medway, check three things first: proof of relevant commercial experience (not just domestic work), a clear understanding of your CDM 2015 duties as a client, and a fixed, itemised quote rather than a rough estimate. Expect to pay roughly £2,200 to £3,200 per square metre for a standard Cat A office fit-out in the South East in 2026, less for shell-and-core retail or warehouse space. Get at least three quotes, ask to see a construction phase plan before work starts, and choose a contractor who project manages the whole job rather than subcontracting oversight away. A good Medway-based contractor should be able to walk you through all of this before you sign anything.

What does a commercial building contractor actually do?

A commercial building contractor delivers construction work for businesses, landlords and developers rather than private homeowners. That covers new commercial builds, office and retail fit-outs, warehouse and industrial units, extensions to existing commercial premises, and full refurbishments.

The scope is different from domestic building work in a few important ways. Commercial projects usually involve more stakeholders (landlords, tenants, building control, sometimes a planning authority), stricter regulatory obligations under the Construction (Design and Management) Regulations 2015, and tighter programme deadlines because every week a unit sits unfinished is a week of lost trading or rent.

A contractor who mainly does home extensions and loft conversions is not automatically equipped for this. If your own project is actually a home extension rather than a commercial one, our guide to planning permission for a house extension in Medway covers that process instead. For a commercial project in Medway, ask specifically about a contractor's commercial portfolio, not just their overall build experience.

How much does commercial construction cost in Medway in 2026?

Costs vary significantly by building type and specification. National average figures for 2026 from industry cost data give a useful starting point, though your actual quote will depend on the specific site, access, and finish level.

(Source: RapidQS UK, Construction Cost Per m² UK 2026 report)

These are national and South East benchmarks rather than Medway-specific figures, since published cost data is rarely broken down to town or borough level. Treat them as a sense check for any quote you receive, and ask your contractor to explain any figure that sits well outside these ranges.

Why quotes from different contractors can vary so much

Two quotes for what looks like the same job can differ by 20% or more. The usual reasons are: whether the price includes professional fees (architect, structural engineer, building control), whether it is a fixed price or a provisional sum with contingencies added later, and whether the contractor has priced a full site survey or is working from drawings alone. Always ask what is and isn't included before comparing figures side by side.

What questions should you ask before hiring a commercial contractor?

A short vetting conversation upfront saves a lot of problems later. At minimum, ask:

• Can you show me two or three completed commercial projects of a similar size and type in Medway or the wider South East?
• Who will be my main point of contact, and will they be on site or managing remotely?
• Is the quote fixed price, and what would trigger a variation?
• What is your typical programme for a project this size, and what happens if it overruns?
• Do you hold public liability and employer's liability insurance, and can I see current certificates?
• Who takes on the CDM 2015 principal contractor role, and will you prepare the construction phase plan?

A contractor who answers these clearly and without hesitation is generally a safer bet than one who is vague on specifics. Our own project management service is built around answering exactly these questions upfront, before any contract is signed.

What are your legal duties as a commercial client under CDM 2015?

This catches out a surprising number of business owners taking on their first construction project. Under the Construction (Design and Management) Regulations 2015, if you commission construction work for your business, you are a "commercial client" and you have specific legal duties, not just your contractor.

You must:

• Appoint contractors and designers (including a principal designer and principal contractor on any project involving more than one contractor) with the right skills, knowledge and experience for the job.
• Allow sufficient time and resource at every stage, not just to complete the build but to plan it and manage it safely.
• Provide pre-construction information to everyone bidding for or appointed to the work.
• Make sure suitable welfare facilities are provided for the duration of the project.
• Ensure a construction phase plan is drawn up by the principal contractor before work starts on site.

If your project runs for more than 30 working days with more than 20 workers on site at once, or totals more than 500 person-days of work, it also becomes notifiable to the Health and Safety Executive using form F10.

(Source: Health and Safety Executive, CDM 2015: commercial clients, hse.gov.uk)

A competent Medway contractor should raise CDM 2015 with you unprompted at quote stage. If a contractor doesn't mention it at all, that's worth asking about directly.

Design and build vs traditional contract: which suits your project?

Most commercial clients in Medway choose between two routes.

Design and build means a single contractor, such as Meridian Contractors, takes responsibility for both design and construction under one contract. You get one point of accountability, fewer gaps between design intent and what actually gets built, and typically a faster overall programme because design and early construction planning can overlap.

Traditional contract means you appoint an architect or designer separately, get the design fully worked up, then put the completed design out to tender to contractors. This can give slightly more competitive pricing at tender stage because contractors are pricing a fixed design, but it puts more of the coordination risk on you as the client, and any design changes once the contract is signed tend to be slower and more expensive to make.

For most straightforward commercial fit-outs, extensions and refurbishments in Medway, design and build is the lower-risk route for a business owner who doesn't have construction expertise in-house. Larger or more architecturally complex new builds may still suit a traditional route.

Signs of a reliable commercial contractor (and red flags to avoid)

Reliable signs:

• They ask detailed questions about your business operations, not just the building, before quoting.
• Their quote is itemised, not a single lump sum.
• They can name their principal designer or explain how CDM 2015 duties will be handled.
• They give you a realistic programme, including likely lead times for materials.
• References check out when you contact previous commercial clients directly.

Red flags:

• Pressure to sign quickly or pay a large deposit before any contract is agreed.
• No fixed address or verifiable trading history in Medway or the wider South East.
• Reluctance to put the scope of work and price in writing.
• No mention of insurance, warranties, or CDM responsibilities unless you ask first.
• Quotes that are dramatically lower than every other bid, with no clear explanation why.

Why work with a Medway-based commercial contractor

A contractor based in Medway, rather than commuting in from London or further afield, tends to know the local supply chain, local building control teams, and realistic local lead times for materials and subcontractors. That local knowledge often shows up as fewer surprises during the build and a more accurate initial programme.

Meridian Contractors is a Chatham-based building contractor delivering commercial construction, residential construction, renovations and extensions, and full project management across Medway, Kent and the South East. Our commercial construction service covers new builds and fit-outs for businesses, landlords and developers, and our project management service covers end-to-end oversight, including CDM 2015 compliance, from planning through to handover.

If you're planning a commercial building project in Medway, get in touch for a fixed, itemised quote and we'll talk you through the process, your CDM duties, and a realistic programme before you commit to anything.

FAQ

How much does a commercial building contractor cost in Medway?

It depends heavily on the project type. A standard Cat A office fit-out typically runs £2,200 to £3,200 per square metre in 2026, while a shell-and-core retail unit is usually £1,500 to £2,200 per square metre. Get an itemised quote rather than relying on a headline figure, since inclusions vary between contractors.

Do I need planning permission for a commercial building project?

Often yes, especially for a change of use, an extension, or significant alterations to the external appearance of a building. Some internal fit-out work can fall under permitted development, but this depends heavily on the specific building and its planning history. Check with Medway Council or your contractor before committing to a design.

What is a principal contractor under CDM 2015?

The principal contractor is the party responsible for planning, managing, and coordinating health and safety during the construction phase on projects involving more than one contractor. As the client, you must appoint one in writing, and they must prepare a construction phase plan before work starts on site.

How long does a typical commercial fit-out take in Medway?

A standard office Cat A fit-out of a few thousand square feet typically takes eight to fourteen weeks once design is finalised, though this varies with scope, materials lead times, and whether the building is occupied during works. Your contractor should give you a realistic programme in writing before work starts.

Should I choose design and build or a traditional contract?

For most commercial fit-outs, extensions and refurbishments, design and build gives a single point of accountability and a faster overall programme, which suits business owners without in-house construction expertise. Larger or architecturally complex new builds may still suit appointing an architect separately and tendering the finished design.