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I have sat through a lot of resignation conversations. Not the ones where someone has outgrown the role, but the avoidable ones. The person who was frustrated for eight months who never said so. The manager who was surprised, when nobody else was.
Retention is one of those areas where the evidence is unusually clear and the practice is unusually patchy. CIPD recommendations make the point plainly: understanding why people leave is what allows employers to design anything that actually reduces turnover. Most organisations skip that step and go straight to the intervention.
There is a commercial case too. Research by Oxford Economics put the average cost of replacing an employee at £30,614, most of it lost output while a new starter gets up to speed over roughly 28 weeks. That study is over a decade old, so treat the number as directional, but the shape of it holds. Losing good people is expensive in ways that rarely appear on a single budget line.
Here are the five strategies to help you improve employee retention I would prioritise.
1. Measure turnover properly before you try to fix it
An overall turnover percentage tells you almost nothing on its own. Break it down by team, by manager, by tenure and by whether the leaver was someone you wanted to keep. A 20% figure driven entirely by first-year leavers in one department is a different problem from 20% spread evenly across a stable workforce.
Exit interviews help, though people are often diplomatic on the way out. I get more value from stay interviews: a conversation with people who are still here, asking what would make them consider leaving and what keeps them. The answers arrive while you can still act on them.
2. Invest in your line managers
This is the biggest lever most organisations have and the one most often left alone. The CIPD's Good Work Index 2025, based on responses from over 5,000 UK workers, found that employees who viewed their line managers positively were more likely to feel effective in their roles, less likely to say work harmed their health, and less inclined to consider leaving.
Most managers are promoted for technical competence and then expected to absorb people management by osmosis. Training, time and a clear sense of what good looks like is not a soft investment. It changes the experience of everyone reporting to them.
3. Make progression visible, not just available
People rarely leave because no development exists. They leave because they cannot see it. Limited opportunity for career growth was the most common barrier employees feel is holding them back.
Publish your career frameworks. Show people what the next role requires and how long it typically takes. Be honest about lateral moves where upward promotions are limited. Ambiguity is what pushes people to test the market.
4. Define flexibility more broadly than working from home
Flexibility has become shorthand for hybrid working, and that framing does employers a disservice. Location is one variable, and for plenty of roles it is the least available one. The organisations that retain people well are flexible across a much wider range of things.
Not every role, team or organisation can offer a lot of flexibility, but you can start with looking at hours. Compressed weeks, staggered start and finish times, term-time arrangements, part-time roles and the ability to move a day around a commitment often matter more than where the laptop opens. Then look at how you accommodate specific circumstances: caring responsibilities, health conditions, neurodivergence, religious observance, a phased return after leave. Handling those individually and well earns more loyalty than any blanket policy.
Benefits can also be flexible. A fixed package built around the average employee suits almost nobody. A pick list, where people choose between additional leave, pension contributions, healthcare, learning budgets or childcare support, recognises that your workforce comes from different backgrounds, carries different responsibilities outside work and is at different life stages.
Flexibility programmes or policies fail when there is inconsistency: flexibility available in theory, granted unevenly in practice, and more accessible to senior staff than junior ones. That does more damage than a clear, firmly held position ever would.
5. Take workload and wellbeing seriously at source
A quarter of UK workers report that their job has a negative impact on their mental health, equivalent to an estimated 8.5 million people, and CIPD analysis links that experience to excessive workload, pressure and poor relationships with managers. Those same people are more likely to quit within twelve months.
Wellbeing initiatives that sit alongside an unmanageable workload do not work. The useful questions are about job design, resourcing and how pressure is distributed, which are harder to answer than adding another benefit.
Where I would start
Pick one thing. Most retention strategies fail because organisations attempt everything at once and sustain none of it. Understand why your people leave, fix the reason that comes up most often, and measure whether it worked. Once that change is locked in and settled, rinse and repeat - don't make
Sources
• CIPD, guidance on employee turnover and retention. https://www.cipd.org/uk/knowledge/factsheets/turnover-retention-factsheet/
• Oxford Economics, The Cost of Brain Drain, 2014, reported via HR Review. https://hrreview.co.uk/hr-news/recruitment/it-costs-over-30k-to-replace-a-staff-member/50677
• CIPD, Good Work Index 2025, June 2025. https://www.cipd.org/uk/knowledge/reports/goodwork/
• ADP, People at Work 2025, reported in People Management, October 2025. https://www.peoplemanagement.co.uk/article/1935987/one-five-workers-complain-limited-opportunities-career-advancement-study-finds
• CIPD, Good Work Index 2025, reported in People Management, June 2025. https://www.peoplemanagement.co.uk/article/1921073/quarter-employees-say-work-negative-impact-mental-physical-health-cipd-research-reveals