Subcontractor Agreements: What General Contractors Should Require in Writing

A general contractor is on the hook to the client no matter which subcontractor actually did the work that went wrong. That single fact is the reason a subcontractor agreement is not optional paperwork — it is the document that lets a GC actually pass responsibility, cost, and timeline expectations down to the sub who is doing the work, instead of absorbing every problem themselves.

A lot of smaller GCs skip this because subs are often people they have worked with before and trust. Trust is exactly why it rarely gets formalized — and exactly why the one time it goes wrong, there is nothing in writing to point to.

The scope of work has to be specific enough to enforce

A subcontractor agreement that just says "electrical work" leaves too much room for disagreement about what was actually included. Break the scope down by task, reference the relevant plans or specs by name, and state what is explicitly excluded — because unclear boundaries are where "I thought that was someone else's job" disputes come from.

Detailed scope of work, referencing plans/specs where relevant

Start date, completion deadline, and any milestone dates

Payment schedule — lump sum, per milestone, or draw schedule

Insurance and licensing requirements the subcontractor must maintain

Change-order process for anything outside the original scope

Indemnification and insurance protect the GC specifically

The agreement should require the subcontractor to carry their own liability insurance and provide proof of it before starting work — a GC who skips this is effectively self-insuring for the sub's mistakes. An indemnification clause, where the subcontractor agrees to cover costs arising from their own negligent work, is what actually lets that insurance requirement mean something in practice.

Retainage — holding back a percentage of payment until the work passes final inspection — is standard in construction subcontracts for a reason: it gives the GC leverage to get punch-list items actually finished instead of chasing a sub who has already been paid in full.

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Payment terms need to survive a dispute with the client

If the GC has not been paid by the client yet, does that delay payment to the subcontractor? "Pay-when-paid" and "pay-if-paid" clauses exist for this exact situation, but they need to be stated explicitly — a subcontractor who assumed they would be paid on a fixed schedule regardless of the GC's own payment status will reasonably push back if that was never disclosed.

Frequently asked questions

Is a subcontractor agreement different from an independent contractor agreement?

They cover similar ground, but a subcontractor agreement is specific to construction and typically includes retainage, lien waivers, and insurance/licensing requirements that a general independent contractor agreement usually does not.

What is retainage and why does it matter?

Retainage is a percentage of the contract value (commonly 5–10%) held back until the work passes final inspection, giving the GC leverage to ensure punch-list items get completed.

Do subcontractor agreements need to be signed before work starts?

Yes — signing after work has already started removes most of the agreement's leverage, since disputes about scope and payment are much harder to resolve once work is already underway.

Can a subcontractor agreement be signed electronically on a job site?

Yes — an e-signature sent by text or email can be signed from a phone on-site, which is often faster than getting a physical signature from someone moving between job sites.