The firm you paid usually stays answerable for the people it sent

You contracted with one party, and a van arrived with another name

A homeowner engages a company to fit a bathroom. On the morning of the work, two people arrive from a business the homeowner has never heard of, do the job, and leave. Something goes wrong a month later, and the argument immediately becomes a question about who is responsible to whom. It is an extremely common shape of dispute, and the confusion is usually genuine on both sides.

The starting point in most systems is that your contract is with whoever you agreed with, and it does not change because they arranged for somebody else to do the work. The subcontractor made an agreement with the main contractor, not with you. That structure explains the answer to most of what follows, including several results that feel counter-intuitive when you are standing in a damaged bathroom.

Performance can be delegated, responsibility generally cannot

Legal systems draw a distinction between doing something and being answerable for it. A contractor is usually free to have the work performed by others, but that arrangement does not transfer the obligation owed to the customer. If the work is defective, the customer’s claim is against the party they engaged, whose remedy is then to pursue their own subcontractor separately.

That chain exists for a sensible reason. A customer cannot investigate a supply chain, negotiate with everyone in it or monitor who was on site on a given day. Placing responsibility at the point where the customer actually made an agreement keeps the claim manageable and pushes the cost of a bad subcontractor onto the party who chose them. It also means a contractor’s insolvency can leave a customer stranded even though the person who did the work is still trading, which is an uncomfortable feature of an otherwise coherent rule.

When the subcontractor is separately exposed anyway

The contractual chain is not the only route. Where careless work causes injury or damages property beyond the work itself, many systems allow a claim in negligence against whoever did the work, independent of any contract. The duties are different in scope from contractual ones and the damages recoverable are often narrower, particularly for purely financial loss, but the route exists.

Some arrangements also create a direct relationship deliberately. A separate warranty, a collateral agreement, or a manufacturer guarantee on installed equipment can give the customer rights against a party they never engaged. Those are creatures of the paperwork rather than of general principle, so whether one exists is answered by reading what you were given rather than by reasoning about it.

Sometimes you cannot substitute the person at all

Where the identity of the performer is the point of the contract, delegation is usually not permitted without consent. Engaging a particular consultant, artist, surgeon or specialist adviser is generally understood as engaging that person, and quietly passing the work to a colleague may itself be a breach. Whether a contract is of that character depends on what was agreed and on the nature of the service, and it is a frequent source of argument in professional work.

Written terms often address this expressly, either by reserving a right to subcontract or by requiring approval first. Reading that clause before signing is more useful than discovering it afterwards, particularly where the reason you chose a supplier was a named individual whose availability nobody confirmed.

Chasing the wrong party quietly spends the clock

The practical damage from this confusion is rarely legal. It is temporal. Months disappear in correspondence with a subcontractor who has no obligation to the complainant, while the party who does have one hears nothing and later argues that the problem was never properly raised. Meanwhile a limitation period continues to run, indifferent to how reasonable the confusion was.

Establishing early who you actually contracted with is therefore worth more than a strongly worded letter to the visible party. The quotation, the confirmation, the invoice and the payment record usually answer it between them. Where they contradict each other, which happens more often than it should, that inconsistency is itself something to raise before positions harden.

The variation, and where to take the question

How far responsibility can be passed down a chain, what direct duties a subcontractor owes, and how far a written term permitting delegation will be enforced all differ between jurisdictions and between kinds of contract. Construction and professional services are often treated distinctly, and consumer protections may sit on top of everything.

This is a description of a recurring structure rather than advice about a live problem, and any real outcome will turn on the documents and facts of the particular job. Where the work is significant or damage has occurred, take advice from a qualified lawyer in your own jurisdiction early. Ask about time limits in the first conversation, because an internal complaints process run by a large contractor does not normally stop the clock while it grinds on.