A company announces that everyone may work flexibly. Hours are not fixed, home days are welcome, and the policy document says so in friendly language. Then, over a few months, the real arrangement shows itself. Messages sent at nine at night get a reply within minutes from the people who are seen to be committed. A request to leave early for a school event is granted, but quietly noted. Nobody wrote any of this down, yet everybody learns it.
This piece looks at that gap between the flexibility a business offers and the unwritten rules that govern how it can actually be used, with a focus on after-hours expectations. It is a hypothesis drawn from general research on job control and working time, not a finding about any particular South African employer.
Flexibility on paper, rules in practice
Flexible work usually arrives as a promise of control: the employee decides where and, to some extent, when the work gets done. The promise is real in many businesses. The difficulty appears when the arrangement has no stated edges. If nobody has said when a reply is expected, or which hours are genuinely free, each person has to guess, and the safest guess is to be available all the time.
The World Health Organization's guidance on mental health at work identifies low job control, poor communication and unclear roles among the working conditions that pose a risk to mental health. An unwritten rule is a form of unclear communication. It carries all the weight of an instruction without the clarity of one, and it cannot be questioned because it was never spoken.
The UK Health and Safety Executive's management standards for work-related stress treat control as one of the core conditions of a healthy workplace, meaning how much say a person has in the way they do their work. Control that exists in principle but is quietly cancelled by an expectation of constant availability is not control in the sense the standard describes. The person has the freedom to choose, and the penalty for choosing differently.
How invisible rules form
Invisible rules rarely come from bad intentions. They tend to grow from three ordinary sources.
- Imitation. A senior person answers late messages, perhaps because it suits their own rhythm. Others read this as the standard.
- Tool defaults. Chat and email show who is online and when a message was read. A tick or a green dot becomes a small public record of responsiveness.
- Client pressure passed down. A customer who expects quick answers makes the business anxious, and the business turns that anxiety into an unstated expectation for staff.
Self-determination theory, a long-established body of psychology research, describes autonomy as one of the basic needs that support motivation and wellbeing. Flexible arrangements that quietly come with strings can deliver the opposite: a sense of being controlled, with the added burden that one is not allowed to say so.
An illustrative case
Consider an illustrative example, not a real case: a Cape Town marketing agency of fifteen people that adopts flexible hours after a difficult stretch of load-shedding. Staff may start late if their suburb is without power in the morning, and may work from wherever the lights are on. The managing director means every word of it.
Within a season, a pattern emerges. Because the directors tend to send briefs in the evening, staff who reply the same night are seen as dependable. A designer who wants to protect her evenings begins to feel that her flexibility is a favour she is being granted, not a condition of the job. A project manager starts keeping his phone beside his plate at dinner. Nobody is told to do this. When the agency later asks why morale has dipped, the answer is not found in any policy, because the policy says nothing about evenings at all.
The human tax: autonomy and predictability
The first cost is autonomy. People lose the ability to decide, without justification, when their working day ends. The second is predictability: if the rules are unwritten, nobody can plan an evening, a class or a family commitment with confidence that it will survive a message arriving.
These costs are not evenly shared. People with fewer alternatives, such as junior staff, those on probation or those who cannot easily change employer, are least able to test where the line is. In a country with high unemployment, many workers will quietly absorb an unstated expectation rather than risk finding out it was real. The business sees compliance and may read it as contentment.
South African law gives some anchor points. The Basic Conditions of Employment Act sets out rules on ordinary hours of work, overtime and rest periods for the employees it covers, though coverage and thresholds vary and it is worth checking the current position for a particular role. A business that relies on invisible after-hours expectations may be creating obligations it has never priced or recorded.
What could realistically change
The fix is not to abolish flexibility. It is to say out loud what flexibility means in this business, and to make the answer something people can rely on.
- Write down the response expectations. For each kind of communication, say how fast a reply is expected and in which hours. "Within one working day" is a clear rule. "ASAP" is an invisible one.
- Separate urgent from important. Agree one channel, such as a phone call, that is reserved for real emergencies, and treat everything else as able to wait until the next working morning. The note on the quiet power of choosing when to respond describes why this distinction matters to the person receiving the message.
- Schedule sending. Leaders who write in the evening can delay delivery until morning, so that their own working pattern does not become everyone else's expectation.
- Have the managers go first. Rules are believed when they are visibly followed by the people who set them. A director who takes a real afternoon off does more than a paragraph of policy.
- Review the pattern, not just the policy. Look at when messages are actually sent and answered over a month. The guidance in Friday evening should start on Friday evening shows how a small, concrete boundary can be agreed and kept.
The business outcome
A business with explicit after-hours rules has fewer misunderstandings about what is owed. It spends less energy on unspoken competition to look responsive, and can see more clearly when work genuinely does need out-of-hours cover, so that the cost can be planned for, rostered and, where required, paid. Where the pattern is already causing strain, when the working day has no natural end is a useful companion read.
The human dividend
The dividend is autonomy together with predictability: knowing that the evening is the employee's own unless a stated emergency says otherwise, and being able to build a life around that. What a person does with the time is theirs to decide. It might be family, study, rest, a side project or doing nothing at all. The point is not a particular kind of evening but the freedom to have one.
The trade-offs
- Some responsiveness is lost. Clear boundaries mean some replies will wait until morning, and a few clients may find that frustrating.
- Not every role can be bounded. Support, operations and incident roles may need genuine out-of-hours cover, which should then be rostered and compensated, not assumed.
- Rules need maintenance. A written expectation that nobody follows becomes another invisible rule with a document attached.
- Some people prefer to work at night. The aim is choice, not a uniform schedule, so individual patterns should be allowed without becoming a standard for others.
Why it matters
Flexible work is only as flexible as its unwritten rules allow. When the edges are stated, shared and honoured by the people at the top, employees get a freedom they can actually use, and the business gets what the flexibility was meant to buy: people who work well because they are trusted to manage their own time.
Sources and further reading
- Mental health at work (last verified 10 October 2026)
- Management Standards - Control - HSE (last verified 10 October 2026)
- Self-determination theory - Wikipedia (last verified 10 October 2026)
- Basic Conditions of Employment Act 75 of 1997 - South African Government (last verified 10 October 2026)
Related Mellorca reading
- The Freedom That Comes From Knowing Where Things Stand
- Why Approval Chains Make Capable People Wait
- When Monitoring Replaces Trust