Quick Answer
Moving from residential to commercial means higher day rates, bigger contracts, and steadier income. But you need proper insurance (minimum £5 million public liability), at least one SSIP accreditation like CHAS or SafeContractor, and a clear understanding of how commercial payment terms work. Budget £2,000-5,000 for accreditations and insurance upgrades, start by subcontracting to established contractors, and give yourself 6-12 months for the transition. It is a marathon, not a sprint.
Table of Contents
- Why go commercial
- The real differences between residential and commercial
- Insurance: what you need and what it costs
- Accreditations and certifications that open doors
- Pricing commercial work
- Finding your first commercial contracts
- Cash flow and payment terms
- Legal and regulatory requirements
- Building your commercial team
- What tradespeople are saying
- Recommended videos
- Frequently asked questions
- My verdict
HMRC
Xero
SageWhy go commercial
The domestic market is crowded. There are 885,000 construction SMEs in the UK, and a good portion of them are competing for the same boiler swaps, rewires, and bathroom refits. The margins are tight and the work comes in waves.
Commercial work offers a different equation entirely. Day rates for electricians sit at £300-400 on commercial projects, compared to £250-350 for residential. Plumbers and HVAC engineers see similar uplifts. The UK commercial construction market is worth £21.6 billion in 2026, growing at 3.2% annually. That is a lot of work looking for capable contractors.
But the real draw is not just the money per job. It is the predictability. Commercial clients need ongoing maintenance, planned preventive work, and reactive call-outs on a schedule. Once you are on an approved contractor list, work flows steadily. You stop relying on homeowners remembering to call you back. You can build a pipeline and actually plan ahead.
I went through a version of this transition myself. I started as a domestic gas and heating engineer, fitting boilers and servicing systems in people's homes. Over time, I moved into working with letting agencies, housing associations, and larger institutional clients. The scale changed, the complexity increased, and so did the opportunity. The trades gave me everything: the discipline, the work ethic, the problem-solving. Commercial work just gave me a bigger canvas.
If you are already thinking about building recurring revenue through maintenance contracts, commercial clients are where that model really takes off. A single facilities management contract can be worth more than a month of domestic call-outs.
The real differences between residential and commercial
The technical work is often similar. A pipe is a pipe. A circuit is a circuit. But everything around the technical work changes when you move commercial. The business model, the paperwork, the payment terms, the client expectations, and the risk profile are all different.
Here is a straightforward comparison of what changes:
| Aspect | Residential | Commercial |
|---|---|---|
| Day rate (electrician) | £250-350 | £300-400+ |
| Payment terms | Immediate to 7 days | 30-60 days |
| Insurance minimum | £1-2m public liability | £5-10m public liability |
| Accreditations needed | Gas Safe / NICEIC Domestic | SSIP + CSCS minimum |
| Documentation | Basic invoicing | RAMS, method statements, CPP |
| VAT registration | Optional under £90k | Practically mandatory |
| Client relationship | Direct to homeowner | Through FM, main contractor, or procurement |
| Contract type | Verbal or simple quote | JCT, NEC, or bespoke |
The documentation burden is the thing that catches most people off guard. For a domestic job, you write a quote, do the work, send an invoice. For a commercial job, you may need risk assessments, method statements, a construction phase plan, site induction records, COSHH assessments, toolbox talk logs, and weekly progress reports. All before you pick up a tool.
VAT registration is another practical shift. Most commercial clients expect VAT invoices. If you are under the £90,000 threshold and not registered, you look like a small outfit that is not ready for the work. It is not a legal requirement, but it is a practical one.
And the client relationship changes fundamentally. In residential work, you deal with the person who owns the property. In commercial, you might deal with a facilities manager, a main contractor's site agent, a procurement team, or a quantity surveyor. None of them live in the building. They care about compliance, cost, and schedule. The personal touch that wins domestic work does not carry the same weight.
Insurance: what you need and what it costs
Insurance is the first gate. No commercial client, facilities manager, or main contractor will let you on site without it. And the levels they expect are higher than what most residential tradespeople carry.
Here is what you need:
Public liability insurance: The minimum for most commercial contracts is £5 million. Larger clients, local authorities, and construction firms often require £10 million. For context, most domestic tradespeople carry £1-2 million. A £5 million policy typically costs £300-700 per year depending on your trade, turnover, and claims history. The uplift from £5 million to £10 million adds roughly £13-50 per year, so it is worth going straight to £10 million if you can.
Professional indemnity insurance: Not legally required for most trades, but more and more commercial clients now demand it. Around 85% of local government contracts in 2025 required proof of PI cover. If you do any design work, provide certificates, or sign off installations, you need it. Costs range from £150-500 per year for £1 million of cover.
Employers' liability insurance: This one is legally required if you employ anyone, even one person. The minimum cover is £5 million, and the penalty for not having it is £2,500 per day, per employee. Costs run £60-250 per employee per year. If you are hiring to take on commercial work, this is non-negotiable.
Talk to a specialist trade insurance broker, not a comparison site. Brokers like Rhino Trade Insurance, Kingsbridge, or Towergate understand the specific requirements for commercial construction work. They will make sure your policy wording actually covers the work you intend to do, which is critical if you ever need to make a claim.
Accreditations and certifications that open doors
Accreditations are the second gate. Most commercial clients and all public sector bodies require contractors to hold at least one SSIP (Safety Schemes in Procurement) accreditation. Without one, your tender goes straight in the bin.
The three main SSIP schemes are:
CHAS (Contractors Health and Safety Assessment Scheme): Starts at £239 per year for sole traders, £279 for small businesses. Three tiers: Standard, Advanced, and Elite. You will need comprehensive evidence of your health and safety policies, risk assessments, training records, and accident reporting procedures.
SafeContractor (Alcumus): Similar scope and pricing to CHAS. Covers health and safety compliance, equal opportunities checks, and environmental management. Many facilities management companies specifically ask for SafeContractor.
Constructionline: Government-backed pre-qualification platform. Goes beyond health and safety to cover financial stability, environmental management, quality management, GDPR compliance, and modern slavery policies. Bronze starts at £249, Gold at £499 for the smallest turnover band. Fees scale with company turnover.
The good news is that all three are SSIP members, so they are mutually recognised. Having one satisfies clients who require any of the three. If you can only afford one to start, pick whichever your target clients mention most. CHAS is the most commonly requested in my experience.
CSCS cards: Not legally required, but practically mandatory on most commercial construction sites. Site managers will turn you away at the gate without one. A skilled worker blue card requires an NVQ Level 2 or 3 plus the CITB Health, Safety and Environment test. Total cost is about £58.50 and the card is valid for five years. Get this sorted before anything else. It is cheap and opens every door.
Trade-specific certifications: Depending on your trade, you may need additional commercial qualifications. NICEIC Approved Contractor status (£400-700 per year) covers all electrical work including commercial and industrial. Gas Safe commercial modules (COCN1, CIGA1, CORT1) cost £995-1,350 for training. F-Gas certification for refrigeration and air-conditioning is a one-off £1,280 for a lifetime qualification.
Pricing commercial work
Pricing commercial work is different from quoting Mrs. Jones for a new bathroom. The numbers are bigger, the margins are tighter, and you need to account for costs that do not exist in residential work.
Your commercial price needs to cover:
Direct costs: Labour (at commercial day rates of £300-400 for electricians, £320-480 for plumbers), materials, plant hire, and subcontractor costs. These are the same categories as residential, just larger.
Indirect costs: This is where commercial differs. You need to factor in your insurance premiums, accreditation fees, CSCS card renewals, ongoing training costs, vehicle costs, site welfare contributions, and admin time. On a residential job, these might add 10-15% to your costs. On commercial work, it can be 20-30%.
Retention: Most commercial contracts withhold 5% of each payment as retention. Half is released at practical completion, the remaining half at the end of the defects liability period, which is typically 12 months. On a £50,000 contract, that is £2,500 you will not see for a year or more. Your pricing needs to account for this cash being locked up.
If you are using structured quoting tools like those covered in our quote-to-invoice automation playbook, you will want to build commercial-specific templates that include all these additional line items.
For your first few commercial jobs, get a quantity surveyor or an experienced commercial estimator to review your pricing. A two-hour consultation (£100-200) can save you from underpricing a job by thousands.
Finding your first commercial contracts
Finding commercial work is a different game from waiting for the phone to ring. You need to go out and find it. Here are the main channels, ranked by how accessible they are for a business making the transition.
1. Subcontracting to larger firms. This is the easiest entry point and the one I would recommend starting with. Find an established commercial contractor in your area and offer your services as a subcontractor. You will earn less per day than working directly for the end client, but you skip the tender process, the accreditation requirements are lower, and you learn how commercial sites operate. Build your track record here first.
2. Property management and facilities management companies. Companies like Savills, CBRE, Knight Frank, and JLL maintain commercial properties across the UK. Their supply chain teams are always looking for reliable local subcontractors. Register on their approved supplier lists. Start with reactive maintenance (lower barrier to entry) and build towards planned maintenance and project work.
3. Contracts Finder. The UK government's portal for contract opportunities above £12,000 (including VAT). Free to register, free to bid. Covers councils, NHS bodies, and arms-length government bodies. This is where many small trades businesses find their first public sector work.
4. CompeteFor. A free supplier platform linked to major public and private capital projects. 75% of contracts awarded through CompeteFor have gone to SMEs, and two-thirds to businesses outside London. Partners include HS2 and other major infrastructure projects. Worth registering even if you are not ready to bid immediately.
5. Direct approaches. Identify commercial buildings in your area: offices, retail units, restaurants, gyms, hotels. Find out who manages the property and introduce yourself. Many smaller commercial landlords do not use formal procurement. They want a reliable local tradesperson they can call when something breaks. Carry your SSIP certificate, insurance documents, and a one-page capability statement.
When it comes to winning tenders, the key is to answer exactly what they ask. Follow the tender format precisely. Address every evaluation criterion. Include your accreditation certificates, insurance schedule, and relevant case studies. A clean, complete submission beats a technically brilliant but disorganised one every time.
Cash flow and payment terms
Cash flow is where the residential-to-commercial transition gets uncomfortable. In domestic work, you finish a job, send an invoice, and get paid within days. In commercial work, 30-60 day payment terms are standard. Some contracts stretch to 90 days.
The 2025 Late Payment Reform introduced a 60-day cap on payment terms for large firms paying smaller suppliers, with mandatory interest of 8% above the Bank of England base rate on late payments. Finance directors can now be held personally accountable for persistent late payment. This is real progress, but it still means you could be waiting two months for your money.
Here is what this means in practice. Say you take on a commercial job worth £15,000 in materials and labour. You buy the materials on 30-day trade credit, pay your team weekly, and then invoice the client on completion. With 60-day payment terms, you are funding the entire job plus your team's wages for at least 8-10 weeks before you see a penny from the client. Add 5% retention on top of that, and the cash flow gap can be significant.
If you are working as a subcontractor, the Construction Industry Scheme (CIS) adds another layer. The main contractor deducts 20% from your payments (or 30% if you are not registered). You reclaim this through your tax return, but it means your cash flow takes a further hit in the short term. Our full CIS guide covers how to manage this.
Practical steps to manage commercial cash flow:
Invoice factoring: Specialist construction factoring companies will advance 80-90% of your invoice value within 48 hours, charging 1-3% of the invoice value. It costs money, but it plugs the cash flow gap.
Stage payments: For larger contracts (£10,000+), negotiate monthly stage payments based on work completed. Most main contractors accept this because it matches their own payment structure from the client.
Separate bank account: Keep commercial and residential income in separate accounts. This makes it easier to see exactly where your cash position is and prevents one side of the business from subsidising the other.
Legal and regulatory requirements
Commercial work comes with a heavier regulatory burden. Some of these requirements are legally mandatory. Others are contractually required by clients. Either way, you need to understand them before you set foot on a commercial site.
CDM Regulations 2015: The Construction (Design and Management) Regulations apply to all construction projects. When more than one contractor is involved (which is the case on most commercial projects), a principal contractor must be appointed. Even as a subcontractor, you have specific duties under CDM: cooperating with the principal contractor, reporting unsafe conditions, and following the construction phase plan. Our CDM guide for small projects covers the full requirements.
RAMS (Risk Assessments and Method Statements): Legally required under the Management of Health and Safety at Work Regulations 1999 for every employer and sole trader. On commercial sites, you will be asked to submit task-specific RAMS before you start any work. A risk assessment identifies hazards and control measures. A method statement describes step-by-step how you will carry out the work safely. If you have never written one, there are free templates on the HSE website. Do not overthink them, but do take them seriously.
Fire safety: Commercial buildings fall under the Regulatory Reform (Fire Safety) Order 2005. The responsible person (usually the building owner or occupier) must maintain a fire risk assessment. If your work affects fire compartmentation, alarm systems, or escape routes, you need to understand these obligations. Trades working on fire alarm and sprinkler systems may need specific certifications.
Building regulations differences: Part P (electrical safety in dwellings) does not apply to commercial properties. Commercial electrical work is regulated under the Electricity at Work Regulations 1989 and BS 7671. Part L (conservation of fuel and power) has a separate Volume 2 for non-domestic buildings with different assessment tools and carbon reduction targets. The Building Safety Act introduces additional requirements for higher-risk buildings.
Building your commercial team
You can do residential work as a sole trader. Commercial work is harder to manage alone. The projects are bigger, the paperwork is more demanding, and clients expect continuity. If you are off sick for a week, the job still needs to move forward.
This does not mean you need to hire ten people overnight. Scaling is a funny thing. Scale too quickly and the cracks show. Scale without the proper resourcing and you lose people and clients. Scale at the right time with the right team, and the whole world opens up.
A practical approach:
Phase 1: Subcontract specialists. Before hiring, build a network of trusted subcontractors you can call on for commercial jobs. This gives you flexibility without the fixed cost of employees. Make sure they hold their own CSCS cards and have appropriate insurance.
Phase 2: Your first hire. When commercial work is consistent enough to justify it, bring on a skilled operative with commercial experience. This person is worth their weight in gold because they already know how commercial sites work, what documentation is expected, and how to interface with site managers and quantity surveyors.
Phase 3: Admin support. Commercial work generates three to four times more paperwork than residential. At some point, you will need someone handling invoicing, accreditation renewals, tender submissions, and document management. Using accounting software like Xero or Sage becomes essential at this stage.
Every engineer I have trained has made my business stronger. The learning cycle goes both ways. When you hire people with commercial experience, they bring knowledge you do not have. When you hire apprentices, you shape them to your standards. Both approaches work. The important thing is to invest in people deliberately, not just hire bodies when you are overwhelmed.
CSCS cards are mandatory for all personnel working on commercial sites. Make sure every member of your team has one before you commit to a commercial project. The application process takes 2-4 weeks, so plan ahead.
What tradespeople are saying
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Frequently asked questions
Not necessarily separate policies, but you need to make sure your existing cover extends to commercial work. Many residential-only policies exclude commercial sites. Talk to your broker and get the policy upgraded to cover both. The premium increase is usually modest, £200-400 per year, and one policy covering everything is simpler to manage.
CHAS is the most widely recognised and the cheapest starting point at £239 per year for sole traders. All SSIP schemes are mutually recognised, so having one satisfies clients who require any of them. Start with CHAS, and add Constructionline later if you are targeting local authority or government work.
Plan for 6-12 months from decision to first proper commercial contract. Getting insurance and accreditations sorted takes 4-8 weeks. Building your first commercial track record through subcontracting takes another 3-6 months. Do not expect to walk straight into direct commercial contracts with no track record. Be patient with it.
Yes, plenty of sole traders do light commercial work, especially in reactive maintenance and small fit-out projects. But for larger contracts, clients prefer limited companies because of the additional legal protections. If commercial work is going to be a significant part of your business, forming a limited company makes sense for both credibility and liability protection.
Budget £2,000-5,000 for the basics: insurance upgrade (£300-700), SSIP accreditation (£239-499), CSCS card (£58.50), and any trade-specific certifications you might need. If you need Gas Safe commercial modules, add £995-1,350 for training. That first investment is recoverable from a single medium-sized commercial contract.
My verdict
Moving from residential to commercial is one of the best decisions a trades business can make for long-term stability. Higher day rates, bigger contracts, and recurring maintenance income transform your business model. But it is not something you rush into over a weekend. Get your insurance right, pick up at least one SSIP accreditation, sort your CSCS cards, and start by subcontracting to learn how commercial sites work. Keep your residential income running while you build your commercial track record. Give yourself 6-12 months and invest £2,000-5,000 to do it properly. The commercial market is worth £21.6 billion and growing. There is room for capable, well-prepared trades businesses. Just make sure you are one of them.
