Is It Illegal to Subcontract Work Without a License?

In most US states, yes - it is illegal to subcontract work without the required contractor license. Subcontracting all the physical work out does not change that. In construction arbitrage, you are the prime contractor in the eyes of the law: you signed the contract with the client, so the licensing obligation is yours. In around 33 states that means holding a contractor license before you take the first job. Doing it unlicensed in those states carries criminal penalties, civil fines, and - critically - the loss of any right to collect what you are owed.

The model itself is legal. Subcontracting work is how the entire construction industry runs. What is illegal is running it without the compliance that applies where you are working.

There are actually two distinct questions here, and both matter for anyone running this model.

When is it illegal to subcontract work without a license#

Question one: do YOU need a license to take the prime contract?

In states with statewide general contractor licensing - California, Florida, Georgia, Nevada, Tennessee, Virginia, Washington and around 28 others - yes. If your name or your entity's name is on the prime contract with the client, you are the contractor of record. The licensing obligation attaches to that role, not to who is on the tools. Subcontracting 100% of the physical work makes no difference.

In around 17 states - including Texas, Colorado, Kansas, Illinois, Pennsylvania and Vermont - there is no statewide GC license for most general construction work. You can enter a prime contract without a state-issued credential. Local rules still apply: Austin, Dallas, Houston and San Antonio each have their own contractor registration requirements. New York has no statewide GC license but New York City, Nassau, Suffolk and Westchester County all have their own systems. Always check where the specific job sits, not just the state.

Question two: do YOUR subcontractors need their own licenses?

Almost always yes - even in states with no statewide GC license. The regulated trades carry their own licensing requirements everywhere. In Texas, electricians are licensed by the Texas Department of Licensing and Regulation (TDLR), plumbers by the Texas State Board of Plumbing Examiners, and HVAC by TDLR. Your subs must hold the relevant trade license regardless of whether you need one as GC.

In California, every sub must hold a valid CSLB license in the correct trade class. There is no general exemption for subs because the GC is licensed. A roofing sub needs a C-39. A concrete sub needs a C-8. That is the compliance picture, and it extends to everyone you put on a job.

The penalties, jurisdiction by jurisdiction#

Here are the verified figures - not estimates.

California - source: CSLB

A first offense for contracting without a license carries up to six months in jail and/or a $5,000 fine. A second offense carries a mandatory 90-day jail sentence and a fine of 20% of the contract price or $5,000, whichever is greater. On top of the criminal exposure, SB 779 raises the minimum administrative civil penalty to $1,500 from July 1, 2026. Under Business and Professions Code section 7031, an unlicensed contractor cannot sue to collect payment - and the client can demand a full refund of everything paid.

The sub angle is where this gets serious for construction arbitrage operators: a licensed GC can be forced to return all money paid by the client for work performed by an unlicensed sub, even if the GC was unaware of the sub's unlicensed status. That is not a gray area - it is the law. Verify your subs' license status on the CSLB's online register before they go on any job.

Florida - source: Florida Statutes Chapter 489

Fines reach up to $10,000 per offense for unlicensed contracting. Under Florida Statute 489.128, contracts entered into by unlicensed contractors are unenforceable - the client owes you nothing, legally. In serious cases, hiring an unlicensed sub can itself constitute a criminal offense.

There is one narrow exception: an unlicensed person may work under the supervision of a licensed GC, provided the work falls within the GC's license scope and is not a regulated trade (electrical, mechanical, plumbing, roofing, swimming pool, air-conditioning). For the regulated trades, the sub must hold their own independent license, period.

Maryland - source: NASBP

Contracting or hiring an unlicensed sub without a required license is a misdemeanor - fine of up to $1,000 and/or up to six months imprisonment.

Virginia: The Department of Professional and Occupational Regulation (DPOR) governs contractor licensing. GCs face sanctions and fines for using unlicensed subs. Licensing is required statewide.

The model is perfectly legal. Running it without the compliance your jurisdiction requires is not - and in the wrong state the consequences are not theoretical.

The UK position#

The UK has no contractor license system comparable to the US state boards. There is no exam to pass, no credential to hold, and no penalty for "subcontracting without a license" in that sense. What IS required - and what carries real penalties - is the Construction Industry Scheme (CIS).

As the main contractor in the UK, before you pay your first sub you must:

• Register with HMRC as a CIS contractor
• Verify every sub's registration status with HMRC before their first payment
• Deduct the correct rate: 0% for subs with gross payment status, 20% for registered subs without gross payment status, 30% for unregistered subs
• File monthly CIS returns with HMRC

From 2025, HMRC strengthened the fraud provisions. If you knowingly fail to make the correct CIS deductions, HMRC can charge you 20% of the gross amount paid to the sub, plus 100% of any CIS credit that sub claimed, plus penalties of up to 30% of the lost tax. That is on top of the underlying deduction you should have made. The exposure stacks quickly on any real job.

Register at GOV.UK before the first payment goes out.

How to protect yourself on the subcontractor side#

Here is what I do before a sub goes on any job:

1. Check their license live - not a copy of a certificate. In California, use the CSLB's contractor licence check tool. In Florida, use the DBPR portal. A certificate can be outdated or fake; the live register cannot.
2. Confirm the scope matches - their license class must cover the actual work. A plumbing sub cannot do roofing under their plumbing license.
3. Get a certificate of insurance naming your entity before work starts.

If a sub cannot pass those three checks, they do not go on a job. The liability exposure for using an unlicensed sub - losing the client's entire payment in California, criminal exposure in Florida - is not a risk worth taking.

The bottom line#

The question is usually asked the wrong way. "Can I subcontract all the work?" - yes, that is the model. "Do I need a license to do it?" - in most US states, yes, and your subs need theirs too. "What happens if I don't?" - civil fines, criminal charges, and the loss of the right to collect what you are owed.

For the full breakdown of which license class you need and how to get licensed in each state, see do you need a contractor license for construction arbitrage. For the California-specific detail, see is construction arbitrage legal in California. For a complete view of the risks in this model - not just licensing - see what are the risks of construction arbitrage.

The room where people are actually running this model licensed and properly set up is Construction Arbitrage Players on Skool. That is the place to get the practical side sorted.

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 advice. Licensing rules, penalty thresholds and CIS rates change. Verify current requirements with the relevant state licensing board, HMRC or a qualified construction attorney before you take work.

Last checked: 2 July 2026.