Construction arbitrage is legal. Winning the prime contract and subcontracting the work to specialist trades is exactly how the construction industry operates - general contractors, main contractors and developers have done it for decades. The model is not the issue; what the law checks is compliance: your licence, insurance, registration and tax in your jurisdiction.
That distinction matters. I run this model licensed and insured across multiple markets, and the first question I get from anyone thinking about starting is always the legality one. So let me answer it properly, country by country, from verified sources.
What makes construction arbitrage legal in the first place
Construction arbitrage means acting as the prime contractor - the company the client contracts with - while subcontracting the physical work to specialist trades and keeping the spread between what the client pays and what the trades cost.
There is no law in any English-speaking market that says a contractor must perform work with their own hands. The law says: if you enter the prime contract, hold the correct license and insurance, and be responsible for the result. The model of subcontracting is how every major construction project in the world gets built.
The reason it is legal is the same reason it works as a business: the prime contractor absorbs the accountability and risk that the client needs and the subcontractor does not want. You are not hiding anything. You are being the entity the client hired.
The compliance picture - what every jurisdiction checks
The specific rules differ, but every country is checking for the same four things before they consider your operation legitimate:
- Licensing - do you hold the right contractor license or registration for the type and value of work you are contracting for?
- Business registration - is your entity properly set up in the jurisdiction?
- Insurance - do you carry general liability at minimum, and where required, workers' compensation or public liability cover?
- Tax - are you reporting income and making the correct payments or withholdings on subcontractor payments?
Get those right and construction arbitrage is a clean operation. Miss one and the exposure is real regardless of how well the actual job goes.
Is construction arbitrage legal in the United States?
Yes. The model is legal across all 50 states. Licensing, however, sits entirely at the state level - there is no federal general contractor license.
A handful of states have no statewide GC license requirement at all. Texas, Kansas and Colorado are among them, though local municipalities in those states often impose their own licensing rules. Most other states require a license before you can enter a prime contract above a value threshold, and the boards that issue those licenses are state-level bodies with real enforcement powers.
California is the strictest example: the Contractors State License Board (CSLB) requires a license for any project where the combined labour and materials cost is $1,000 or more. Contracting without one is illegal, and from July 2026 the minimum civil penalty for unlicensed activity rises to $1,500 - plus an unlicensed contractor cannot use the courts to recover payment on work performed.
New York, Florida and most other large states each have their own boards, thresholds and license classifications. Always verify the requirement in the specific state where the work is being performed before you take the prime contract.
For a full breakdown of how it works in the strictest US state, see Is Construction Arbitrage Legal in California?.
Is construction arbitrage legal in the United Kingdom?
Yes - and there is an extra layer of compliance that does not exist anywhere else: the Construction Industry Scheme (CIS).
CIS is an HMRC scheme that requires you, as the main contractor, to verify every subcontractor before you pay them and then deduct tax at source from their payments. The deduction rates are:
- 30% for unregistered subcontractors
- 20% for subcontractors registered under CIS
- 0% for subcontractors holding gross payment status
The deduction applies to the labour element of the payment only - genuine materials costs and equipment hire are excluded from the deduction base. The amounts deducted go directly to HMRC and count toward the sub's income tax and National Insurance bill.
As a CIS contractor you must register with HMRC before making your first payment to a subcontractor. You verify each sub at the start, file monthly returns (including nil returns from April 2026 where no subs were paid), and issue each sub a payment and deduction statement within 14 days of each tax month end.
From April 2026, CIS integrates with Making Tax Digital (MTD), which requires digital record-keeping and quarterly submissions. The system is not complicated once you understand the mechanics, but skipping registration is not an option - HMRC has specific anti-fraud powers under CIS and can assess penalties on the full gross payment, not just the missed deduction.
Register as a CIS contractor at GOV.UK before you pay anyone.
Is construction arbitrage legal in Canada?
Yes - and licensing sits at the provincial level, with significant variation between provinces.
Quebec is the most tightly regulated: the Régie du bâtiment du Québec (RBQ) requires a license for anyone who carries out or contracts for construction work, with limited exemptions. Ontario requires licensing through the Home Construction Regulatory Authority (HCRA) for new home construction, while specialist trades - electrical, plumbing, HVAC - must hold certification from Skilled Trades Ontario. In British Columbia, specialist trade work requires certification from Technical Safety BC. Saskatchewan contractors typically register with the Saskatchewan Construction Association and must hold the relevant trade certifications.
For most provinces, a general contractor acting as a prime contractor faces fewer mandatory licensing barriers than the specialist trades themselves - but municipal permits and local registration requirements vary widely and still apply. The practical rule: before you take a prime contract in any Canadian province, confirm with the provincial licensing authority what applies for that type and value of work in that location.
Is construction arbitrage legal in Australia?
Yes - and like the US and Canada, licensing is handled at the state and territory level.
New South Wales requires a contractor licence from NSW Fair Trading for any building or trade work valued at more than $5,000 in labour and materials (including GST). The application requires approved qualifications and at least two years of documented practical experience. South Australia requires a licence through Consumer and Business Services for all building work contracting. Victoria, Queensland, Western Australia and the other states each run their own licensing frameworks with their own thresholds and classifications.
One important point for the Australian market: as the prime contractor you are also responsible for ensuring your subcontractors hold the appropriate trade licences for regulated specialist work. Using an unlicensed sub on regulated work is a breach in most states, and the liability sits with you as the prime.
What actually makes it illegal
The model - winning the prime contract and subcontracting the delivery - is not illegal anywhere. What is illegal is:
- Contracting without a required licence - the single most common trap. The penalties include fines, prohibition orders, and loss of the right to recover payment.
- Using unlicensed subcontractors for regulated specialist work - passing the work down the chain does not transfer your liability if the sub is not properly qualified or licensed.
- Skipping CIS registration in the UK - HMRC can assess penalties on the full gross payment, not just the missed deduction.
- Misrepresenting your insurance position - taking work you are not insured to cover creates serious exposure for both you and the client.
- Underdeclaring income or subcontractor payments - the tax obligations around paying subs are real and enforced.
None of these are gray areas. They are the compliance requirements that make the margin yours to keep legitimately.
The model is standard general contracting - the same structure that builds every commercial development, every major remodel, every infrastructure project. The compliance is what separates a clean operation from a liability. Get it right once and you run this with a clear conscience.
The next step
If you are at the start, how to start a construction arbitrage business covers the setup in the right sequence - entity, license, insurance, first clients and first subs. For the contracts and insurance layer in detail, contracts, insurance and staying legal goes deeper on the documents that protect you on every job.
The compliance is not the hard part of this business. It is a one-time setup cost you pay to run it clean from the first job. The model is worth doing properly.
If you want the full system in one place, THE FAMILY SECRET - How Construction Arbitrage Really Works is coming soon.
This is general information, not legal or tax advice. Licensing rules, tax thresholds and penalty amounts change. Verify current requirements with the relevant licensing board or a qualified professional in your jurisdiction before you take work.
Last checked: 10 June 2026.
Frequently asked questions
Is construction arbitrage legal?+
Yes. Winning the prime contract and subcontracting the work to specialist trades is legal in every major market. It is how general contracting and development have always worked. The compliance requirements - licensing, registration, insurance, tax - vary by country and state, but the model itself is not illegal anywhere.
Do you need a license to do construction arbitrage?+
In most jurisdictions, yes. If you are entering into a prime contract for construction work, the law typically requires you to hold the relevant contractor license for that type and value of work. States, provinces and countries differ on which license applies, but operating without one where one is required is a serious offence with real penalties.
Is it legal to subcontract all the work out?+
For private construction contracts, there is no general prohibition on subcontracting all the work - and most large general contractors do exactly that. Federal government contracts in the US impose self-performance minimums (15% on general construction), but private work is different. The requirement is that the prime contractor holds the correct license and insurance.
What happens if you do construction arbitrage without a license?+
You face civil and criminal penalties that vary by jurisdiction - fines, prohibition orders, and in some states the inability to enforce payment in the courts. In California, unlicensed contracting carries minimum civil penalties of $1,500 from July 2026. In the UK, failing to register under CIS and missing deductions triggers HMRC penalties. The exposure is real.
Does construction arbitrage require registering under CIS in the UK?+
Yes. If you pay subcontractors for construction work in the UK, you must register with HMRC as a CIS contractor before making your first payment. You then verify each sub, apply the correct deduction rate (20% for registered, 30% for unregistered), and file monthly returns including nil returns from April 2026.
Which US states require a general contractor license?+
Most states do, but a handful - including Texas, Kansas and Colorado - have no statewide general contractor license requirement (though local municipalities in those states may impose their own rules). States like California, New York and Florida have strict statewide licensing boards. Always verify the requirement in the specific state where you are taking work.
Mohamed El HadriCo-Founder
I'm a co-founder of several construction companies. I built a construction business from a 30-van operation into a lean model with 1,400+ subcontractors in the database - winning the work as the main contractor, subbing it out, and running it as a system from a laptop across multiple countries. I write this site from what actually works.
@mointhemarket · 30k followers on Instagram →Run the model with people who already do
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