How to hire a custodian

To hire a custodian, start by measuring the building's real cleaning load, test for attention to detail and safe chemical handling before anyone sits an interview, check references for reliability rather than technique, and be ready to make an offer inside two weeks. The role is easy to fill badly and expensive to fill twice.

That last point is the one most hiring plans miss. Custodial work looks like a role you can fill from a stack of applications on a Friday afternoon. Then the new hire mixes two cleaning chemicals in a closed restroom, or quietly stops showing up on Tuesdays, and you are back at the start with a dirtier building and an annoyed tenant.

TL;DR

• Custodial hiring is a churn problem, not a growth problem. The occupation is projected to grow only 2 percent this decade, yet about 321,800 openings come up every year.
• Pay is the floor, not the differentiator. The national median is $17.71 an hour, so competing on wage alone gets you the same applicants as everyone nearby.
• Test for chemical safety and attention to detail before the interview. Those two failures cost the most and are the hardest to spot in conversation.
• A custodian and a janitor are not the same hire. If the job is mostly cleaning with no minor repairs, you want the janitor route.
• References tell you about reliability. The cover letter and the resume tell you almost nothing about whether someone shows up.
• Budget two weeks from posting to offer, and expect to lose good candidates to anyone faster.

What does a custodial staff hire actually cost?

Budget the wage, the employer load on top of it, and the cost of the vacancy itself. The Bureau of Labor Statistics reports a median hourly wage of $17.71 for janitors and building cleaners as of May 2025. At 2,080 hours that is roughly $36,800 a year in base pay before taxes, insurance, uniforms, supplies or training.

The wage is the part everyone budgets. The vacancy is the part nobody does. Every week the role sits open, someone else covers it, usually on overtime. Work out that number for your own building before you set the pay rate, because it is often larger than the gap between a median offer and a strong one.

Two more lines belong in the budget and rarely make it. Training time is real: a custodian who has never handled your floor machine needs supervised hours on it, not a handover conversation. And replacement cost compounds because you pay for advertising, screening, and training twice when the first hire doesn't last the quarter.

Pro tip: Price the offer against the vacancy, not against the market. If a week of uncovered cleaning costs you more than a dollar an hour across the year, pay the dollar.

Should you hire a janitor or a custodian?

Hire a custodian when the job includes light maintenance alongside cleaning: swapping filters, resetting a breaker, fixing a loose handle, reporting a leak before it becomes a claim. Hire a janitor when the work is cleaning, restocking, and waste, full stop. The titles get used interchangeably in job ads, and that is exactly why so many of these hires land wrong.

The distinction matters for what you test and who applies. A custodial posting that lists minor repairs will filter out strong cleaners who have never held a wrench, and a janitorial posting that hides the repair work will land you someone who declines it in month two.

If your scope is genuinely cleaning only, our guide to hiring a janitor is the better starting point, and the screening differs more than the job titles suggest.

Custodian skills worth testing before you hire

Two failures account for most bad custodial hires: someone who cannot follow a chemical label, and someone who cleans what is visible and skips what is not. Both are testable in twenty minutes. Neither reliably shows up in an interview, because both candidates will tell you they are careful and detail-focused, and both will mean it.

This is where a competency-to-evidence matrix earns its keep. Instead of starting with a test, start with the role, then map each competency to the evidence that would actually prove it. For a custodian, that looks like this.

Notice what is not on that list. Years of experience do not predict much here, and a tidy resume predicts less. The evidence column is the point: if a competency has no evidence source, you are not assessing it, you are guessing at it and calling the guess a judgment.

A practical note on the testing itself, because it bites hardest in exactly this kind of hiring. Testlify assessments run on Chromium desktop browsers, and the mobile app is a capture fallback for audio and video rather than a way to sit a whole test on a phone. Plenty of strong custodial applicants have a phone and no laptop.

Plan for that: put a laptop in the break room, run the test on site during the walk-through, or accept that a phone-only requirement will quietly filter out people who would have been good at the job.

Two things help when the workforce is multilingual, which it often is. Test and custom questions can be translated into the candidate's preferred language in real time, though the quality varies by language pair, so it is worth reading the translated version before you send it.

Furthermore, candidates can request an accommodation, including for limited english fluency, which routes to an administrator who adjusts the session.

What does a custodian cover letter really tell you?

Less than you would like. A custodian cover letter mostly measures whether the applicant had help writing one, and it is a weak proxy for the things that actually decide this hire: showing up on time, reading a chemical label, noticing the corner nobody else noticed.

So read it for two narrow signals and then put it down. First, does the applicant name the setting they have worked in, a school, a hospital, a factory floor, a multi-tenant office?

Setting transfers better than task lists do, because the pace and the interruptions differ more than the cleaning does. Second, do they mention shifts? Someone who volunteers that they have worked nights and early opens is telling you something real about availability, which is the constraint that sinks most custodial schedules.

What it hides is everything about reliability. No cover letter has ever disclosed a pattern of Tuesday absences. That signal lives in the reference check, which is why the next section matters more than this one.

How to review a custodian's references and service history

Call the direct supervisor, not the HR line, and ask about attendance before you ask about anything else. A reference check on a custodial hire has one job: confirm that the person turned up and did the work unsupervised. Everything else you can test. Attendance you cannot.

Ask four questions and keep them concrete. On how many occasions did they miss a shift without calling? Did they work alone, and was the building right the next morning? Who checked their work, and what did they check? Would you put them back on the same site tomorrow? The last one is the tell. A supervisor who hesitates on a rehire question has told you what a scripted answer never will.

Service history deserves the same literal reading. Gaps in custodial work are normal and usually say nothing, because the sector runs on contract cycles that end whether or not you were good at the job.

A pattern of very short stays at multiple sites is different, and it is worth asking about directly rather than inferring. Sometimes the answer is that the contracts kept changing hands. Sometimes it is not.

One more check that gets skipped: confirm the reference is who they say they are. Call the building's main number rather than the mobile number you were given. It takes a minute and it is the only part of a reference check that can be faked outright.

What safety training must you provide on day one?

If your custodian will handle hazardous cleaning chemicals, training is not optional and it is not a nice-to-have on the onboarding checklist. Under OSHA's Hazard Communication Standard, all employers with hazardous chemicals in the workplace must keep labels and safety data sheets for exposed workers and train them to handle those chemicals appropriately.

The injury data explains why this sits on day one rather than week three. In 2020, janitors and cleaners recorded 21,100 injury and illness cases involving days away from work, at a rate of 191.6 per 10,000 full-time workers. The leading cause was not a fall. It was exposure to harmful substances or environments, at 4,740 cases, just ahead of falls on the same level at 4,720.

Chemical exposure was the single leading cause that year, narrowly ahead of same-level falls. NIOSH makes the same point for employers in its guidance on protecting workers who use cleaning chemicals, published in 2012, noting that some cleaning chemicals cause problems ranging from skin rashes and burns to coughing and asthma.

Three things belong in the first shift, then. Walk the actual chemicals in your actual storage closet, not a generic slide deck. Show where the safety data sheets live and confirm the new hire can find one without help. And name the one rule that matters most, which is never to mix products, because the combination that sends someone to the hospital is usually two things that are individually fine.

Key takeaway: screen for chemical judgment, then train on your own chemicals in the first shift. It is the cheapest risk reduction available in this role and the one most often postponed.

Where to find custodians who stay

The hiring problem in this occupation is not a shortage of people. It is churn. Employment of janitors and building cleaners is projected to grow just 2 percent from 2025 to 2035, slower than average, while about 321,800 openings are projected each year across the decade.

Those openings are almost all replacements rather than new posts, and the arithmetic is stark: annual openings run at about 13 percent of the occupation's 2.4 million jobs, while growth adds a fraction of a percent a year. The same jobs, refilled, over and over.

Read that as a retention brief rather than a sourcing one. If the sector refills roughly 321,800 roles a year against near-flat growth, then whatever you spend attracting applicants leaks straight back out unless the job itself is worth staying in. Fixed schedules beat flexible ones here. So does a named supervisor who actually walks the building, and equipment that works.

For sourcing, the practical order is: current staff referrals first, because they pre-screen for reliability better than any job board; then local posting with the shift pattern and the pay rate stated in the ad, not withheld; then contract agencies last, for cover rather than for permanent hires. Publishing the rate is the single change that most improves applicant quality, because it stops you interviewing people who will decline the offer.

If you need the posting itself, our custodian job description template is built to be edited rather than copied, and the related janitor and cleaner assessment covers the cleaning-only version of the role.

A 30-day custodian hiring workflow

Two weeks from posting to offer is achievable, and 30 days from posting to a fully trained custodian is a reasonable target for a single hire. The sequence matters more than the speed.

1. Days 1 to 2. Write down the cleaning load: square footage, restrooms, shifts, and whether minor repairs are in scope. This decides custodian or janitor, and it decides the pay rate.
2. Days 3 to 5. Post with the rate and shift pattern stated. Send the custodian skills test automatically on application, before any screening call.
3. Days 6 to 10. Review results against a benchmark you set in advance. Treat the chemical-safety section as a gate. Shortlist on evidence, not on resume polish.
4. Days 11 to 14. Run a short on-site walk-through with a practical on your own equipment, then two reference calls to direct supervisors. Offer inside 48 hours of the last call.
5. Days 15 to 30. Hazard communication training on your own chemicals in shift one, supervised equipment hours in week one, and a check-in at day 30 with the person who runs the shift.

The one step people cut is the benchmark in step three, and cutting it undoes the rest. If you score candidates against each other rather than against a standard, a weak applicant pool produces a hire who looks fine on paper and is not.

Hire custodial staff on evidence, not on a hunch

Custodial hiring rewards boring discipline: a clear scope, a safety gate you do not bend, a reference call to the person who actually supervised the work, and an offer that moves before the candidate takes another one. Test the two things that break this hire, train on your own chemicals in the first shift, and the role stops being one you fill twice a year.

If you want to see how the assessment side of that works on a real requisition, book a demo and bring your own custodial scope to it.

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