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When to clean an office: during working hours, in the morning or in the evening after staff leave
Evening, early morning or during the day? How to choose the time for office cleaning based on how the office operates, building access, the alarm and documents left on desks.
In short
- The main clean (vacuuming, mopping, bins, toilets) is usually done in the evening or early morning, when nobody is working in the office.
- Cleaning during the day suits restocking and quick cleaning of the kitchenette, toilets and frequently touched surfaces.
- Evening cleaning requires an agreement on keys, the alarm, building access and what the cleaner must not touch.
- When cleaning during working hours, corridors and escape routes must stay clear and wet floors must be marked.
- It is a good idea to have the cleaning rules (who, what, when) in writing, both at the office and with the supplier.
Most offices choose a combination: the main clean in the evening after staff leave or early in the morning before they arrive, and a short clean during the day only where things get dirty quickly, namely the kitchenette and toilets. Evening cleaning disturbs nobody, but it requires an agreement on keys, the alarm and documents. Cleaning during working hours is easier in terms of access, but noisier.
Below you will find how to compare the individual options, what to consider when ordering, and what to agree in writing with a cleaning company or your own cleaner. What exactly to clean daily, weekly and monthly is covered in a separate office cleaning checklist.
Three timing options compared
| Cleaning time | Advantages | What to watch out for |
|---|---|---|
| Evening after staff leave | Neither the noise of the vacuum cleaner nor the wet floor disturbs anyone, the floor dries by morning, and meeting rooms and desks can be cleaned too. | Keys, alarm, building access, reception; who is responsible for locking up and switching off the lights. |
| Early morning before arrival | The office is clean right at the start of the day, and the previous day's rubbish is gone. | Cleaning must be finished before the first people arrive; with flexible working hours this can be tight. |
| During working hours | The cleaner is available when something is spilled or the paper runs out; there is no need to deal with the alarm. | Noise, wet floors in a working environment, clear passages, discretion during meetings and with screens. |
None of the options is universally right. The deciding factors are mainly how many people are in the office, how long it is occupied, and whether you have your own entrance or share the building with other tenants.
Evening cleaning: what must be agreed in advance
Evening cleaning is the most convenient option for most small and medium-sized offices, because nobody has to adapt. At the same time, it means that a person from outside will be in the office unsupervised. So clarify the organisational side beforehand.
- Building access. Find out from the building manager or at reception until what time the building is open, whether a chip is needed, whether a name must be given at the reception desk, and where waste is taken out.
- Keys and alarm. Decide who will receive the keys or chip, whether the cleaner will get their own alarm code, and what to do if the alarm is triggered by mistake. A separate code for cleaning can be cancelled if needed without reconfiguring the others.
- Time window. Agree from when the cleaning may start (e.g. only once the last person has left) and by when it must finish.
- Locking up and checks. Write down what the cleaner checks when leaving: windows, lights, meeting room doors, locking the entrance, setting the alarm.
- Contact for unexpected situations. The name and phone number of the person to call if someone is still working in the office, something is leaking or the door cannot be locked.
We describe in more detail how to hand over keys and what to put in writing about them in the article how to hand over keys to a cleaning company. The procedure applies to offices too; instead of a flat, it is a matter of building entry and the alarm.
Protecting documents and privacy on desks
With cleaning outside working hours, the most common question is what the cleaner may touch. A simple rule helps both sides: whatever lies on a desk stays where it is.
- Clear desk. Agree within the team that documents and personal belongings are put away in drawers or cabinets in the evening. An empty desk is wiped; a cluttered one is simply skipped.
- Shredding and bins. Confidential papers do not belong in an ordinary bin. If you have a shredding box, the cleaner does not empty it unless explicitly agreed.
- Locked rooms. The management office, server room or archive can remain locked and be cleaned only at an agreed time in the presence of a responsible person.
- Electronics. Keyboards, monitors and phones are cleaned according to the manufacturer's instructions, usually switched off and with only a slightly dampened cloth, never by spraying.
If you are dealing with personal data protection in relation to a cleaning supplier, consider a confidentiality obligation in the contract and check the specific obligations with an expert; this article is not legal advice.
Cleaning during working hours: noise, wet floors, clear passages
Daytime cleaning during operation makes sense in larger offices, where toilets and the kitchenette get dirty quickly during the day, or where the building does not allow access in the evening. A few principles help to keep it unobtrusive and safe.
- Leave noisy work, such as vacuuming an open-plan office, for a time outside peak activity or for the lunch break, and agree where cleaning will not take place at a given moment (a meeting room during a meeting).
- Mop a wet floor in a corridor in sections and mark it with a sign so that people do not slip on it.
- The trolley, bucket and waste bags must not be left in the corridor. The government regulation on workplace requirements stipulates that routes must be permanently clear and escape routes free of obstacles (Government Regulation No. 101/2005 Coll.).
- Do not use strongly smelling products in rooms where people are seated, and ventilate during cleaning. Recommendations on ventilation during cleaning are also given by the US CDC (CDC).
Hygiene of shared areas: what to clean between the main cleans
Even if the main clean takes place in the evening, some surfaces need attention during the day. These are mainly places touched by many people: door handles, light switches, lift buttons, the kitchen counter, the coffee machine, the microwave and toilet fittings. The CDC recommends cleaning frequently touched surfaces regularly and gives door handles, handrails, lift buttons, desks and toilet fittings as examples (CDC).
In practice, the following division works well:
- Evening or morning: floors, bins, toilets and sinks thoroughly, the kitchenette including the sink, and desks that are clear.
- During the day (in larger offices): topping up soap, paper towels and toilet paper, a quick wipe of the counter and sinks, and emptying a full bin in the kitchenette.
- Employees themselves: dishes into the dishwasher, wipe up spilled coffee straight away, and take food out of the fridge before the weekend.
During flu season it may be worth disinfecting selected surfaces more often; which surfaces and how often we describe in the article office disinfection during flu season.
Occupational safety when an external company cleans
If the cleaning is provided by an external supplier, employees of two employers work in the office. In this context, the State Labour Inspection Office reminds us of Section 101(3) of the Labour Code: employers are to inform each other in writing about risks and the measures to protect against them, and to cooperate in ensuring safety and health protection (SÚIP – questions and answers).
For an office, in practice this is a short overview: where the main water shut-off valve, fire extinguisher and first-aid kit are, which areas are off limits, and where cleaning products may be stored. Government Regulation No. 101/2005 Coll. also requires the employer to designate the persons who ensure the cleaning of the workplace, and to state the cleaning intervals for routes in an internal regulation (Government Regulation No. 101/2005 Coll.). This is general information, not legal advice; check the specific obligations with a person qualified in occupational health and safety (BOZP).
For cleaning products, regardless of the time of cleaning, the following applies: follow the label, work in gloves, ventilate and never mix products containing chlorine with acids or with ammonia. Test a new product first on a hidden spot. Store products in a lockable cabinet away from the kitchenette, not next to food.
How to decide: a short procedure for an office manager
- Find out from the building manager the building's operating hours, the rules for external persons and for taking out waste.
- Work out how many hours a day the office is occupied and whether there is a reliable window when nobody is in it.
- Decide which areas need cleaning during the day as well (toilets, kitchenette) and which are fine once a day or less often.
- Write down the rules: time window, keys and alarm, locked rooms, clear desk, contact person.
- After the first two weeks, evaluate what is not working (noise, running out of time, forgotten locking up) and adjust the timing.
When choosing a supplier, it is worth asking whether they can provide cleaning at the time you have chosen and how they handle keys and the alarm; you will find further questions in the article how to choose a cleaning company. If you are considering external cleaning, you can also discuss the scope and frequency with us as part of our office cleaning service. Indicative prices by area and frequency can be found on the page how much office cleaning costs.
Frequently asked questions
Is it better to clean an office in the evening or in the morning?
Both work, provided the office is empty at the time. Evening cleaning has the advantage that the floor dries by morning and there is no need to rush. Morning cleaning hands over a clean office right at the start of the day, but it must be finished before the first people arrive, which can be tight with flexible working hours. Decide based on the building's opening hours and on when the last employee leaves and the first one arrives.
Does the cleaner have to have their own alarm code?
It is not mandatory, but it is practical. A separate code can be cancelled at any time without changing anyone else's codes, and the alarm log shows when the cleaning took place. Also agree what to do if the alarm is triggered by mistake and whom to call. Write the procedure down and hand it over together with the keys or chip, ideally with a signature on receipt.
What should be done about documents on desks when cleaning takes place in the evening?
The simplest approach is a clear-desk rule: documents and personal belongings are put away in drawers before leaving, and the cleaner wipes only empty desks and skips those that are cluttered. Confidential papers belong in a shredding box, not in the bin. Rooms with sensitive materials can stay locked and be cleaned only at an agreed time.
Can office cleaning be done during working hours without disturbing anyone?
Yes, if it is limited to quiet tasks: restocking hygiene supplies, wiping the kitchenette and sinks, and emptying bins. It is better to leave vacuuming an open-plan office to times outside peak activity. Mark wet floors with a sign, do not leave the trolley and waste in corridors, and do not use strongly smelling products in rooms where people are working.
Sources
- Nařízení vlády č. 101/2005 Sb., o podrobnějších požadavcích na pracoviště a pracovní prostředí – Zákony pro lidi (checked 8 November 2026)
- Bezpečnost práce – otázky a odpovědi – Státní úřad inspekce práce (checked 8 November 2026)
- When and How to Clean and Disinfect a Facility – Centers for Disease Control and Prevention (checked 8 November 2026)
Prepared by the Úklid 1-2-3 editorial team with the help of AI and verified against the sources listed. Manufacturers' instructions and regulations change: always follow the current wording of the source and the product label. This article is general information, not professional or legal advice. This article was translated from Czech with the help of AI. The sources are in the original language.
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