The Subcontractor Onboarding SOP

Purpose

A standard operating procedure (SOP) is the written, repeatable process every person follows the same way, so the result does not depend on who set it up. Bringing on a subcontractor without a standard intake is how a shop ends up liable for a sub's uninsured injury, stuck with a surprise tax mess, or represented to a customer by someone who never agreed to your standards. This SOP is the gate every sub clears before they touch a job: the agreement signed, insurance verified, tax paperwork collected, and expectations set. Run it the same way every time and an unqualified sub never reaches a customer's property under your name.

Scope

Applies to any independent subcontractor or outside crew performing work you are responsible for, on a residential or commercial job. Covers the paperwork, the verification, and the orientation that happen before their first job. Two pieces have their own detailed procedures, the W-9 and 1099 tax workflow and certificate-of-insurance tracking, this SOP ties them into the single "before they start" sequence and points to those for depth.

Roles and responsibilities

Procedure

1. Confirm they are genuinely independent

Before anything else, confirm the relationship actually is a subcontract, not an employee you are misclassifying. A worker you control day to day, whose schedule and methods you dictate, whose tools you provide, may legally be an employee regardless of the label, and getting that wrong carries back-tax and penalty exposure. If they run their own business, carry their own insurance, and control how the work gets done, a subcontract fits. When it is close, get advice before you proceed.

2. Sign the subcontractor agreement

No work starts without a signed agreement. It names the scope, the pay terms, insurance and indemnification requirements, the standard of work, and who owns the customer relationship (you do). A handshake sub is an argument waiting to happen. The signed agreement is the document you fall back on when a job goes sideways.

3. Collect the tax paperwork up front

Collect the W-9 before the first payment, not at tax time. Chasing a completed W-9 after the work is done, when the sub has already been paid and moved on, is the classic year-end scramble that leads to filing errors. Get it in the file at onboarding. See the W-9 and 1099 workflow for the full process.

4. Verify insurance and license, do not just collect the paper

Get a current certificate of insurance and confirm it is real: coverage types and limits that meet your agreement, active dates, and ideally your business named as additional insured. A collected certificate is worthless if it expired last month or the policy was cancelled. Verify licensing where the trade and jurisdiction require it. Then track the expiration so you are not exposed the day the policy lapses, covered in the COI tracking article.

5. Orient them to your standards and the site rules

Walk the sub through how you work: safety expectations, how they represent the company on a customer's property, how they document their work, and how issues get escalated. A sub who does not know your customer-facing standards will improvise them, and the customer will judge you by the result. Keep it short but explicit.

6. Grant only the access they need

If the sub needs into your scheduling or job system, grant the narrowest access that lets them do the work, their assigned jobs, not your whole customer book or your financials. Over-granting access to an outside party is a data risk with no upside. Note the access so you can revoke it cleanly when the engagement ends.

7. Set the first job up to be checked

Assign the first job knowing you will inspect it. Define what "done right" looks like, and plan to review the completed work before it is billed to the customer. The first job is where you learn whether this sub meets your bar. Catch a standards gap on job one, on your terms, not on job ten in front of a customer.

Watch out for

• Starting work before the agreement is signed. You lose your fallback exactly when you need it.
• Filing the certificate without reading it. Expired or thin coverage leaves you exposed.
• Chasing the W-9 at year end. Collect it before the first payment.
• Handing over full system access. Give the narrowest access the job requires.

References

• IRS guidance on worker classification and Form W-9 / 1099-NEC
• See related: W-9 Collection and 1099-NEC Workflow; COI Tracking for Subcontractors
• SBA guidance on using independent contractors
• Trade-standard practice for subcontractor qualification