Interview guide · Frontline and high-volume roles
Janitor interview questions
In short
Janitor interview questions should test safe chemical handling, cleaning methods for restrooms and floors, reliability on night or early shifts, trustworthiness when working alone in secure buildings, and pride in finishing a route properly. Below are 31 janitor, custodian and cleaner interview questions with what each reveals, strong answers, red flags, sample answers and a scorecard.
Janitorial work is easy to underestimate and hard to do well. A custodian on an office night shift might clean 25,000 to 40,000 square feet in eight hours: emptying trash, cleaning restrooms to a disinfection standard, vacuuming and mopping, spot-cleaning glass, and locking up behind them. In a school, the day custodian also handles spills, sick students and event setups. In a hospital, environmental services staff follow infection control steps where a missed surface matters. Across all of these, the job runs on three things: doing the route properly when nobody is checking, handling chemicals and equipment safely, and showing up.
Use these questions for janitors, custodians, cleaners and porters in offices, schools, healthcare, retail, industrial sites and contract cleaning companies. For entry-level roles, a 15-minute interview with six to eight questions is enough; most candidates will learn your specific chemicals and methods in training. For lead custodians and floor techs, add the questions in the experienced group and consider a short practical demonstration. Use the same questions for every candidate for the same role, and score as you go.
What to look for in a janitor / custodian
- Chemical and equipment safetyCleaning chemicals cause burns, breathing problems and dangerous reactions if mixed or diluted wrongly. Workers who read labels and follow safety data sheets protect themselves and building occupants.
- Thoroughness when unsupervisedMost janitorial work happens with no supervisor present. The difference between a clean building and complaints is whether each step gets done every night.
- ReliabilityA no-show leaves a whole route undone and the client notices by 8 am. In contract cleaning, repeated misses can cost the contract.
- Trustworthiness and discretionCustodians hold keys and alarm codes and work near confidential papers, money and personal belongings. Honesty is essential.
- Physical readiness for the work as describedThe job involves walking, lifting trash and equipment, bending and pushing machines for a full shift.
- Courtesy with building occupantsDay custodians in schools, hospitals and offices interact with people constantly. A friendly, helpful custodian improves how the whole facility is seen.
Opening and fit questions
What cleaning or custodial work have you done before, and in what kind of buildings?
- Why ask it
- Establishes experience with the facility type, which affects training needs.
- A strong answer
- Describes buildings and tasks specifically: offices, schools, healthcare, restrooms, floors, trash, and any equipment used.
- Red flags
- Very vague or describes only household cleaning without any detail.
This shift runs from 6 pm to 2:30 am, Monday to Friday. How does that work for you?
- Why ask it
- Night shifts drive early turnover if not discussed openly.
- A strong answer
- Confirms with specifics about sleep, family and transport, and asks about breaks.
- Red flags
- Agrees quickly but mentions a day job that ends at 6 pm across town.
The job means walking and standing most of the shift, lifting trash bags and equipment up to 40 pounds, and bending to clean low areas. Can you perform these duties with or without reasonable accommodation?
- Why ask it
- States the essential functions and asks the lawful way.
- A strong answer
- Confirms clearly and may ask about equipment such as carts or lifts.
- Red flags
- Does not listen to the description before answering.
What do you like about cleaning work?
- Why ask it
- Motivation predicts retention in a job some see as a last resort.
- A strong answer
- Enjoys working independently, seeing a finished result, keeping a routine, or helping a building run well.
- Red flags
- Says they dislike cleaning and are only here until something else comes up.
How will you get to and from this site for this shift?
- Why ask it
- Late shifts and suburban office parks make transport a common cause of absences.
- A strong answer
- Clear plan and a backup for when the main option fails.
- Red flags
- No plan for getting home after transit stops running.
Cleaning skills and methods
Walk me through how you clean a public restroom from start to finish.
- Why ask it
- Restrooms drive most complaints and need a correct order to avoid spreading germs.
- A strong answer
- Puts out signs, wears gloves, restocks, works top to bottom and clean to dirty, applies disinfectant and lets it sit for the dwell time on the label, cleans toilets and urinals with dedicated tools, then mirrors and fixtures, empties trash and mops last, working toward the door.
- Red flags
- Uses the same cloth for toilets and sinks, or mops first.
What is the difference between cleaning, sanitizing and disinfecting?
- Why ask it
- Basic knowledge that affects health outcomes.
- A strong answer
- Cleaning removes dirt; sanitizing reduces germs to a safer level; disinfecting kills most germs on a surface and needs the surface wet for the label's contact time.
- Red flags
- Thinks they are all the same.
Why do many cleaning programs use color-coded cloths and mops?
- Why ask it
- Prevents cross-contamination between restrooms and other areas.
- A strong answer
- Explains that specific colors are used for toilets, restroom surfaces, general areas and food areas so tools are never mixed.
- Red flags
- Has never heard of it and sees no reason for it.
How do you mop a large hallway that people are still using?
- Why ask it
- Tests safety and method.
- A strong answer
- Puts out wet floor signs, mops half the width at a time, works from the far end toward an exit, uses the right dilution, and changes water when dirty.
- Red flags
- Mops the whole width with no signs.
What floor care equipment have you used, such as an auto scrubber, burnisher, carpet extractor or floor stripping machine?
- Why ask it
- Equipment experience reduces training time and protects floors.
- A strong answer
- Names machines and explains basic use, safety checks and cleaning the machine afterward.
- Red flags
- Claims experience but cannot describe how to use them.
How would you strip and refinish a vinyl tile floor?
- Why ask it
- Floor tech skill, relevant for some roles.
- A strong answer
- Clears the area, sets signs, applies stripper and lets it dwell, scrubs, picks up the slurry, rinses thoroughly, lets the floor dry, applies thin coats of finish allowing drying between each.
- Red flags
- Skips rinsing or applies thick coats of finish.
You have eight hours to clean a floor of offices. How do you plan your route?
- Why ask it
- Shows organization and time management.
- A strong answer
- Follows a set sequence, such as trash first, then dusting, then restrooms, then vacuuming and mopping last, works in one direction to avoid backtracking, and checks off completed areas.
- Red flags
- Cleans whatever looks dirtiest first, with no system.
What would you do if you found a surface or stain you did not know how to clean?
- Why ask it
- The wrong chemical can ruin surfaces like stone, wood or upholstery.
- A strong answer
- Tests in a hidden spot or asks a supervisor before trying, and checks product labels for surface compatibility.
- Red flags
- Tries the strongest chemical available.
Safety questions
What is a safety data sheet, and when would you look at one?
- Why ask it
- OSHA's Hazard Communication Standard requires employers to keep safety data sheets for hazardous chemicals and train workers on them.
- A strong answer
- Explains it describes the chemical's hazards, required protective equipment, first aid and safe handling, and says they would check it before using a new product or after a spill or exposure.
- Red flags
- Has never heard of it and is not interested.
Why should you never mix bleach with other cleaners such as ammonia or acids?
- Why ask it
- Mixing creates toxic gases and is a common cause of injuries.
- A strong answer
- Knows it can produce dangerous gases and that chemicals should only be used alone, diluted as labeled, in ventilated areas.
- Red flags
- Mixes products to make them stronger.
How do you dilute a concentrated cleaner correctly?
- Why ask it
- Too strong damages surfaces and harms people; too weak does not work.
- A strong answer
- Follows the label or dispensing system, measures rather than guesses, labels any secondary container, and wears the PPE shown on the label.
- Red flags
- Eyeballs it or uses unlabeled bottles.
You find a needle in a restroom trash can, or blood on a surface. What do you do?
- Why ask it
- OSHA's bloodborne pathogens standard covers workers with reasonably anticipated exposure. Safe handling matters in schools, healthcare and public buildings.
- A strong answer
- Does not touch with bare hands, uses gloves and tools, follows the site's sharps and spill procedures, uses a sharps container if trained, and reports it.
- Red flags
- Picks it up by hand or ignores it.
How do you stay safe when using a ladder to dust high areas or change a light?
- Why ask it
- Falls from ladders are a common cause of serious injury.
- A strong answer
- Inspects the ladder, uses the right height, keeps three points of contact, never stands on the top steps, and gets help to hold it if needed.
- Red flags
- Uses a chair or stands on the top of the ladder.
You are working alone at night and something feels wrong, like a door is propped open or a stranger is in the building. What do you do?
- Why ask it
- Lone worker safety and building security.
- A strong answer
- Does not confront the person, moves to a safe place, calls security, the supervisor or 911 according to site procedure, and reports it.
- Red flags
- Confronts the person or ignores it.
Behavioral and trust questions
Tell me about a time no one was checking your work. How did you make sure it was done right?
- Why ask it
- Self-checking is central to this job.
- A strong answer
- A specific example with a personal checklist or habit, such as a final walk-through of each restroom before leaving.
- Red flags
- Admits to cutting corners when unsupervised.
While cleaning an office, you find a wallet on the floor. What do you do?
- Why ask it
- Honesty test relevant to daily work.
- A strong answer
- Leaves it untouched if possible or turns it in to the supervisor or security right away, according to site procedure, and documents it.
- Red flags
- Keeps it at their cart until later or says it depends what is in it.
Tell me about a time you got a complaint about your work. What did you do?
- Why ask it
- Tests how they handle criticism.
- A strong answer
- Listened, fixed the problem, and changed their routine to prevent it.
- Red flags
- Blames others or argues.
In your last job, how many times were you late or absent in the past six months?
- Why ask it
- Attendance is the single most important reliability signal. Do not ask about medical reasons or protected leave.
- A strong answer
- Honest answer with context and steps taken to avoid repeats.
- Red flags
- Many unexplained absences and no ownership.
Describe a time you had to finish your work faster than usual because of an event or emergency.
- Why ask it
- Events, flooding and spills change the plan often.
- A strong answer
- Prioritized the most visible or urgent areas, communicated with the supervisor about what could wait, and kept safety steps.
- Red flags
- Skipped restrooms or safety steps without telling anyone.
How would you respond if a building occupant asked you to do something outside your normal route?
- Why ask it
- Day custodians get frequent requests.
- A strong answer
- Helps if it is quick and within their role, and checks with the supervisor if it would affect the route or needs special equipment.
- Red flags
- Refuses rudely or drops the route to do favors.
Questions for lead custodians and experienced cleaners
How do you inspect an area to know it meets standard?
- Why ask it
- Leads inspect others' work.
- A strong answer
- Uses a checklist, checks high and low touchpoints, restrooms, floors, trash and supplies, and gives specific feedback.
- Red flags
- Only looks at whether it seems clean from the doorway.
How would you train a new custodian on your site?
- Why ask it
- Leads often train new hires.
- A strong answer
- Walks the route with them, shows each task, has them do it while watching, then checks their work for the first week.
- Red flags
- Gives them keys and a map on day one.
A team member keeps skipping tasks on their route. How do you handle it?
- Why ask it
- Leads must address performance issues.
- A strong answer
- Talks privately, shows evidence, explains the standard, checks back, and involves the supervisor if it continues.
- Red flags
- Covers the work silently or confronts publicly.
How do you manage supplies and chemicals for a site?
- Why ask it
- Running out of paper or soap leads to complaints.
- A strong answer
- Keeps a par level, counts weekly, orders before running out, stores chemicals safely and labeled, and tracks waste.
- Red flags
- Orders only when something runs out.
What do you know about green cleaning or reducing chemical use?
- Why ask it
- Many clients and schools ask for safer products.
- A strong answer
- Mentions certified products, microfiber, correct dilution, and dispensing systems that reduce waste.
- Red flags
- Believes stronger chemicals are always better.
How would you handle a client or building manager who is unhappy with the cleaning?
- Why ask it
- Contract cleaning depends on client relationships.
- A strong answer
- Listens, walks the area with them, agrees on fixes and a follow-up date, and reports to their manager.
- Red flags
- Gets defensive or promises things without checking.
Sample answers
I put the closed sign out and my wet floor sign, and put on gloves. First I flush everything and spray the toilets and urinals with disinfectant so it can sit, because the label usually needs a few minutes wet to actually kill germs. While it sits I restock paper, soap and seat covers and empty the trash. Then I clean high to low: partitions and dispensers, mirrors, sinks and counters with the blue cloth, then the toilets and urinals with the red cloth and the bowl brush, inside and out, handles too. Last I sweep and mop starting at the back and working out to the door. Before I leave I do a quick look around, check nothing's dripping, and take the sign down.
I wouldn't open it. At the school district where I worked, the rule was that anything valuable went straight to the night supervisor, and we wrote down where we found it and the time. So I'd do that. If the supervisor wasn't on site, I'd call and leave it with security. It protects me as much as the owner. If something's missing later, there's a record that I turned it in right away. I've had keys to buildings for six years, and the reason people trust you with keys is stuff like this.
I don't reach in the trash with my hands, ever, for that reason. If I see a needle, I'd use tongs or the tool we have, gloves on, and put it in the sharps container. If I'm not trained or there's no container, I'd block the area and call my supervisor. For blood, I'd put on gloves, use the spill kit to absorb it, then use the disinfectant made for that, leaving it wet for the time on the label, and throw everything in the right bag. Then I'd report it. We did bloodborne pathogens training every year at the hospital, so I know the steps.
Interview scorecard
| Competency | Weight | Strong (4–5) | Weak (1–2) |
|---|---|---|---|
| Safety and chemical handling | 25% | Knows SDS, never mixes chemicals, dilutes correctly, handles sharps and blood safely, ladder safety. | Mixes products, guesses dilution, handles sharps by hand. |
| Cleaning knowledge and thoroughness | 25% | Correct restroom sequence, understands disinfection and dwell time, plans an efficient route, checks own work. | Uses same tools everywhere, no system, cannot describe checking own work. |
| Reliability | 25% | Solid attendance history, realistic plan for shift and transport. | Several unexplained absences, no transport plan. |
| Trustworthiness | 15% | Clear, consistent answers on found property and security, respects confidential areas. | Hesitates or gives conditional answers on honesty questions. |
| Courtesy and communication | 10% | Polite and helpful with occupants, handles complaints calmly, reports issues. | Dismissive with occupants or defensive about feedback. |
Score each competency from 1 to 5 straight after the interview, before discussing the candidate with anyone else, then multiply by the weight.
How to structure a janitor interview
For most custodian roles, a short, structured process is enough:
- Application screen. Shift availability, ability to perform the essential functions with or without accommodation, and consent to the background check your sites require. Schools, healthcare facilities and some government buildings often require specific background checks under state law or contract, and the timing of criminal history questions is restricted in many states and cities.
- Interview, 15 to 20 minutes. A supervisor or site manager describes the route, shift and physical work, then asks six to eight questions from the groups above.
- Site walk or short demonstration. For floor techs or lead roles, ask the candidate to show how they would set up and run a machine, or how they would clean a restroom stall. Five minutes shows more than another five questions.
Score right after each interview, using the same scorecard for everyone. When you post or update the role, the custodian job description is a useful starting point for duties and physical requirements.
Mistakes to avoid
Assuming anyone can clean. Untrained cleaners damage floors, mix chemicals and spread germs from restrooms to break rooms. Ask the method and safety questions even for entry-level roles. You are not looking for perfect answers from beginners, but you are looking for care and willingness to learn.
Skipping reliability. In janitorial work, attendance is most of performance. Ask directly about recent attendance, and use our reliability interview questions for more depth.
Asking the wrong questions about health or background. Do not ask about medical conditions, injuries, workers' compensation history or arrest records. Ask about the ability to do the described tasks, and handle background checks after a conditional offer with the required FCRA disclosure and authorization. Rules vary by state and city.
Mixing up roles. Janitorial, housekeeping and maintenance roles overlap but need different skills. Use our housekeeper interview questions for hotel and residential cleaning, and our maintenance technician interview questions for repair work.
Hiring custodians at volume and across sites
Contract cleaning companies and large facilities teams may hire dozens of custodians a month across many buildings, often part-time and on nights. Turnover in contract cleaning is high, so the hiring process needs to be fast and repeatable.
- Hire for each site's shift. Post by building and shift, so candidates know exactly where and when they would work.
- Use short, structured screens. Text-based or recorded screens with five or six of the questions above let candidates respond after their current job, and let supervisors review answers when they have time.
- Keep a ready pool. Keep strong candidates who were not hired warm with a quick message every few weeks, since another site will need someone soon.
- Train in the first week, not just the first day. Pair new hires with an experienced custodian for at least two or three shifts before giving them a route alone.
Track 30- and 90-day retention by site and supervisor. If one building keeps losing new hires, look at the route size and the supervisor before you look at the candidates.
Frequently asked questions
What are common custodian interview questions?
Expect questions about your cleaning experience, how you clean a restroom, how you handle chemicals and safety data sheets, what you do if you find something valuable, your availability for night or early shifts, and your attendance history.
What are good cleaner interview questions?
Ask about cleaning order and methods, the difference between cleaning and disinfecting, chemical dilution, how they check their own work, and how they would handle a complaint. A short practical task is also very useful.
What are custodial interview questions for school jobs?
School custodian interviews often add questions on cleaning up after sick students, handling blood or bodily fluids, interacting with students and staff, setting up for events, and following security procedures. Background checks are usually required.
How do I answer janitor interview questions with no experience?
Talk about any job where you were trusted to work alone, kept a routine or handled physical work. Show that you take safety seriously, follow instructions, and are reliable. Mention that you are comfortable working nights or early mornings if the role requires it.
What should a janitor know about chemical safety?
Read labels and safety data sheets, wear the protective equipment listed, dilute products correctly, never mix chemicals, label every bottle, and store chemicals properly. Report any spill or exposure right away.
How long is a janitor interview?
Usually 15 to 20 minutes, sometimes with a short site walk or demonstration for floor care or lead roles. Many employers make offers within a day or two.