How to Vet a Commercial Cleaning Subcontractor

Why vetting matters more in commercial cleaning than most services

A cleaning subcontractor typically has after-hours access to every space in a building — offices, filing cabinets, server rooms, cash-handling areas — with minimal direct supervision while they work. That access profile makes vetting a security and liability question, not just a quality-of-clean question, and it's the reason a thorough vetting process has to check more than whether a crew shows up on time.

The checklist below is the same one we apply before adding any local cleaning company to our network — every item exists because skipping it creates a specific, foreseeable risk. We publish the full version of this checklist — insurance minimums, reference requirements, background-check triggers, and removal criteria — on our vetting standards page. ISSA, the trade association for the cleaning industry, publishes cleaning industry standards and vendor-vetting frameworks that overlap heavily with the categories below (issa.com), and it's worth reviewing directly if you're building a formal vetting scorecard.

Insurance: confirm coverage, don't just ask about it

Every subcontractor should carry general liability insurance (commonly $1–2 million per occurrence for commercial accounts) and workers' compensation coverage, and you should require a current certificate of insurance directly from their carrier or broker — not a photocopy the vendor provides — before service starts. A certificate that's more than a year old or that lists an expired policy period is a immediate disqualifier.

Confirm your business is named as an additional insured on the policy, which protects you if a cleaning-related incident (a slip, a damaged asset) leads to a claim. This single clause is the most commonly skipped step in informal vendor relationships.

References: call accounts your size, not their biggest client

Ask for references from current accounts similar in scale to yours — a subcontractor's single largest client isn't representative of how they'll treat a mid-sized account. When you call, ask specifically about responsiveness to reported issues and whether pricing or staffing has changed unexpectedly during the contract, since those two questions surface problems a general "are you happy" question won't.

Medical and dental practices should weight reference checks especially heavily given the compliance stakes involved in exam-room and clinical-area cleaning — see our medical and dental cleaning page for the specific reference questions that matter for clinical environments.

Capacity: can they actually staff your frequency and size

A subcontractor can look qualified on paper and still lack the staffing depth to reliably cover a site nightly without gaps when an employee calls out. Ask directly how many crew members they have trained and available as backup for your specific site, not just how many are assigned day-to-day — the backup answer is the one that predicts whether you'll get a missed night three months in.

Confirm this capacity question separately for every location if you're vetting a subcontractor for a multi-site footprint — strong capacity in one market doesn't guarantee the same bench depth in another.

Financial stability: can they survive a slow-paying month

A subcontractor operating on thin margins can be reliable for months and then suddenly lose a crew when they can't make payroll, often with no warning to the client until the next scheduled cleaning simply doesn't happen. Ask directly how long the company has been operating, whether they carry their own workers' compensation policy (rather than leasing employees through a staffing arrangement that obscures who's actually on the hook), and how many other commercial accounts they currently service.

A subcontractor whose entire business depends on one or two large clients is a higher risk than one with a diversified book of business — losing your account wouldn't sink them, and taking on your account isn't a stretch that compromises service elsewhere in their operation.

Background screening for personnel with facility access

For any site with sensitive access — cash handling, patient records, secure areas — require the subcontractor to background- check personnel assigned to your account and provide documentation confirming that screening occurred, rather than taking a verbal assurance. This is one of the most frequently skipped vetting steps because it adds a document request most vendors aren't used to providing.

If your locations are concentrated in a market like Boston, confirm the background-check standard applies consistently across every crew servicing your locations there, not just the crew at your flagship site.

Equipment and supply standards

Ask what equipment and cleaning products a subcontractor actually uses on-site, and whether that equipment is owned and maintained by the subcontractor or borrowed job to job. A crew showing up with worn, poorly maintained equipment — a vacuum that no longer picks up debris, mop heads that haven't been replaced in months — will underperform the written scope regardless of how well-trained the crew members themselves are.

For sites with specific product requirements — hospital-grade disinfectant in medical settings, food-safe products in kitchens — confirm the subcontractor already stocks and uses compliant products rather than agreeing to source them only after being awarded the contract.

Putting the vetting process to work

Running this checklist against every vendor across a multi- location footprint is a real time investment, which is exactly the work a consolidator takes off your plate — every crew in our network goes through this same process before servicing a single location. If you'd rather not run it yourself, request a quote and we'll handle vetting across your entire footprint.