#15 Best Interview Questions for a Janitor or Custodian (With Scoring Guide)

TL;DR (Direct Answer): The best interview questions for a janitor or custodian test reliability (the most predictive trait), knowledge of cleaning chemicals and safety, attention to detail, and response to unexpected situations. Generic questions like "tell me about yourself" reveal nothing useful for this role. The 15 questions below are organized by competency, include what a strong vs. weak answer sounds like, and can be used as a complete structured interview. Hirenest provides pre-built janitor interview frameworks with these questions and scoring rubrics already built in — so you run a consistent process without building it from scratch.

#Why Standard Interview Questions Fail for Janitorial Roles

The skills that predict janitorial job performance — reliability, consistency, attention to detail, safety awareness — are almost impossible to assess through standard interview questions. "Where do you see yourself in five years?" tells you nothing about whether this person will show up every day and clean the bathrooms properly.

The questions below are designed specifically to surface the traits that actually matter for custodial work.

#The 5 Competencies That Predict Janitor Performance

1. Reliability and consistency — will they show up, every day, on time
2. Cleaning knowledge — do they know what to use and how
3. Attention to detail — do they notice what needs doing without being told
4. Safety mindset — do they handle chemicals and equipment safely
5. Communication — can they flag problems and work alongside others

#The Questions

#Reliability and Consistency

1. "Tell me about your attendance record at your last job. Did you ever miss shifts and how did you handle it when you needed to call out?"

Strong answer: Describes a strong attendance record, gives an example of calling out in advance when genuinely sick, shows awareness that their absence impacts others.
Weak answer: Vague, defensively minimizes past absences, cannot remember their attendance, or blames previous employer for absences.

2. "This role is [days/hours]. Is there anything in your current schedule — family, second job, transportation — that might make that consistency difficult?"

Strong answer: Gives a direct yes or no, volunteers any relevant information honestly, has thought through logistics.
Weak answer: Says "I'll figure it out" without specifics, hedges, or surfaces constraints that clearly conflict with the schedule.

3. "Tell me about a job where you had to do the same tasks every day. How did you stay motivated?"

Strong answer: Describes taking pride in consistent results, mentions noticing small improvements, talks about the satisfaction of a clean space.
Weak answer: Says they got bored, could not stay at the job long, or has no experience with repetitive work.

#Cleaning Knowledge

4. "Walk me through how you would clean a commercial restroom. What do you do first and why?"

Strong answer: Describes a systematic process — typically top-to-bottom, applying cleaners to let them dwell before wiping, disinfecting high-touch surfaces last, restocking supplies, checking drain function.
Weak answer: Vague ("I just clean everything"), no logical order, unfamiliar with dwell time for disinfectants.

5. "What cleaning chemicals have you worked with? What do you need to be careful about when mixing or using them?"

Strong answer: Can name specific products (bleach-based, quaternary ammonium, acid-based), knows never to mix bleach and ammonia, understands PPE requirements, mentions reading SDS sheets.
Weak answer: Vague about specific products, unaware of chemical incompatibilities, shows no safety awareness.

6. "How do you clean a floor that needs both mopping and disinfecting? Walk me through the process."

Strong answer: Sweeps or vacuums first, uses appropriate cleaning solution, changes mop water when dirty, allows floor to dry before traffic resumes, uses wet floor signs.
Weak answer: Skips sweeping step, unaware of wet floor safety, does not change mop water.

#Attention to Detail

7. "Tell me about a time you noticed something that needed to be done that was not in your regular duties. What did you do?"

Strong answer: Specific example — noticed a leaking faucet, broken light, pest evidence, security issue — and either fixed it or reported it immediately.
Weak answer: Cannot think of an example, says it is "not my job," or describes noticing something but not acting on it.

8. "If a manager walked through after your shift and found one area consistently not meeting standards, what would you want them to tell you and how would you respond?"

Strong answer: Welcomes feedback, describes adjusting their process, asks how they can improve, takes accountability.
Weak answer: Defensive, blames tools or supplies, says they would dispute the feedback.

#Safety Mindset

9. "Have you ever had a near-miss or safety incident while cleaning? What happened?"

Strong answer: Shares an honest example (slip on wet floor, chemical splash) and describes what they did afterward to prevent recurrence. Most experienced custodians have a story.
Weak answer: Claims nothing has ever gone wrong (suggests limited experience or dishonesty), or describes incident without any learning.

10. "You are cleaning and find an unlabeled container of liquid. What do you do?"

Strong answer: Does not use it — treats it as unknown and potentially hazardous, reports to supervisor, does not dispose of without guidance.
Weak answer: Would use it anyway, throw it away without reporting, or open it to smell it.

11. "What would you do if a building occupant asked you to use a cleaning product that you know is not appropriate for the surface?"

Strong answer: Politely explains the issue, uses the correct product, offers to get what they need if available, escalates if necessary.
Weak answer: Just does what they are told regardless of damage risk, or becomes confrontational.

#Communication and Professionalism

12. "Tell me about a time you had to work around other people — office workers, customers, building tenants — while cleaning. How did you handle it?"

Strong answer: Describes adapting their schedule, communicating about wet floors or area closures, being courteous while efficient.
Weak answer: Found it annoying, waited for everyone to leave, avoided contact.

13. "If you completed your regular duties and still had 30 minutes left in your shift, what would you do?"

Strong answer: Looks for additional tasks, deep cleans an area, restocks supplies, checks areas done earlier in the shift.
Weak answer: Waits for the time to pass, sits in the break room, asks what to do and then waits.

14. "Your supervisor asks you to use a new cleaning product you have never used before. What do you do before you start?"

Strong answer: Reads the label and SDS sheet, asks for training if provided, tests on a small area if appropriate, uses proper PPE.
Weak answer: Just uses it, ignores instructions, does not think about safety precautions.

15. "What would make you leave a janitorial job after a few months?"

Strong answer: Describes genuine dealbreakers (unsafe working conditions, promised pay not delivered, constantly changing schedules without notice) — things that reflect reasonable expectations.
Weak answer: Describes easily resolved issues as dealbreakers, lists expectations that conflict with the role, or cannot answer.

#Scoring Template

A score of 35+ indicates a strong candidate. Below 25 suggests significant gaps worth addressing before advancing.

#How Hirenest Makes This Easy

Hirenest provides this janitor interview framework pre-built — questions, scoring rubrics, and candidate comparison in one platform. Run consistent interviews for every janitorial candidate without building the process from scratch.

#FAQ

How long should a janitor interview take?
25–35 minutes is appropriate. Enough to ask the key questions without being excessive for a service role. A working interview or brief walkthrough of the space can add 15–20 minutes.

Should I do a practical skills test for janitorial candidates?
A brief walkthrough of the facility — asking the candidate to describe how they would approach specific areas — is a useful practical assessment. A full cleaning test is harder to administer fairly but can be done for final candidates.

What is the single most predictive interview question for janitorial hires?
Question 2 — directly asking about schedule constraints — eliminates the most common cause of janitorial turnover (schedule mismatch) before it becomes a problem. Most employers never ask directly.

Should janitorial candidates be asked about criminal history?
In ban-the-box jurisdictions, only after a conditional offer. Even then, assess relevance to the specific role. A past conviction for theft is more relevant for a role with unsupervised building access than for a role with constant supervision.