The logic behind a trial day is straightforward. A CV tells you what a candidate claims to be able to do; a structured interview tests how they think and communicate; but a trial shift, the reasoning goes, shows you what they actually do when placed in your home and asked to get on with it. For many household employers, particularly those hiring for complex or highly personal roles, this feels like an indispensable step in the recruitment process.
The difficulty is that most employers who run trial days do so without a clear understanding of the legal obligations they are creating. And those obligations are not trivial. Under UK employment law, the moment a candidate performs genuine work — regardless of the label you attach to it, and regardless of whether any job offer has been made — a series of protections and responsibilities come into effect. Navigating these correctly is not optional.
When a Trial Day Constitutes Work Under UK Law
The distinction that matters here is between an assessment and employment. If you invite a candidate to your home to observe, to discuss the role, or to participate in a structured scenario exercise, that is broadly an assessment activity. If you invite them to perform tasks that you would otherwise need to complete yourself or pay someone else to do, that is work — and it must be treated as such.
HMRC and employment tribunals take a functional view of this question. The label you attach to the arrangement — 'trial', 'taster', 'working interview' — carries no legal weight. What matters is the substance of what the candidate actually does. Cooking a meal, accompanying a client to an appointment, managing correspondence, supervising children, or providing personal care are all examples of activities that constitute work, irrespective of the context in which they are performed.
If a candidate performs such tasks during a trial day and is not paid for that time, you are likely in breach of the National Minimum Wage Act 1998. A complaint to HMRC, or a claim at an employment tribunal, could result in back payment of wages, a financial penalty, and reputational damage. The fact that the individual agreed to work unpaid, or that both parties understood it as a trial, provides no legal defence.
The Pay Obligation: Getting It Right
If you proceed with a trial day that involves genuine work, you must pay the candidate for every hour they are present and working. Payment must be at least the National Minimum Wage applicable to their age group — for the 2024–25 tax year, the National Living Wage for those aged 21 and over is £11.44 per hour.
This payment should be made promptly, and you should retain a record of the hours worked and the amount paid. If the candidate is ultimately not offered the position, this payment remains due in full. There is no mechanism under UK law to withhold wages for a trial period on the basis that the individual was not subsequently hired.
From a practical standpoint, you should agree the terms of the trial day in writing before it takes place — including the hours, the tasks, and the rate of pay. This protects both parties and removes any ambiguity about what was agreed.
Insurance and Health and Safety Obligations
Two further obligations that household employers frequently overlook are employers' liability insurance and basic health and safety duties. If a candidate is performing work in your home — even for a single day — they are, for the purposes of these obligations, effectively a worker on your premises.
Employers' liability insurance is a legal requirement for any employer with one or more employees. Whether your existing policy extends to cover individuals during a trial day will depend on the specific terms of your policy. You should contact your insurer before running a trial day to confirm coverage. If your policy does not extend to cover trial candidates, you may need to arrange additional cover or reconsider the format of your assessment.
Your health and safety obligations extend to ensuring that the environment in which the candidate works is reasonably safe: that hazardous substances are stored appropriately, that any equipment they are asked to use is in good working order, and that they are given any information necessary to carry out their tasks safely. These are not onerous requirements in most household settings, but they must be considered.
Structuring a Trial Day That Is Both Legal and Useful
If you are committed to a trial day format, the most important structural principle is to ensure that the tasks involved are genuinely informative rather than simply convenient. A well-designed trial day should test the specific competencies the role requires — not simply provide you with a few hours of free assistance.
Consider the following principles:
- Define the objectives in advance. What specifically are you hoping to learn from the trial that you could not establish through other means? Be precise.
- Limit the duration. A two to three hour structured assessment is generally sufficient to observe the qualities you need. A full working day is rarely necessary and increases your legal exposure proportionally.
- Pay promptly and without conditions. Issue payment at the agreed rate on the day or within a short, agreed period. Do not tie payment to the outcome of the hiring decision.
- Provide appropriate supervision. Do not leave a candidate unsupervised with vulnerable individuals, sensitive information, or complex tasks during a first visit.
- Obtain written consent to the format and terms of the trial day before it begins.
Lower-Risk Alternatives Worth Considering
For employers who find the legal framework around trial days burdensome, there are several alternative assessment methods that can be equally revealing without creating the same obligations.
Structured scenario interviews present candidates with realistic situations drawn from the role and ask them to describe how they would respond. A well-constructed scenario exercise tests judgement, communication, and practical knowledge without requiring physical presence in your home.
Skills-based tasks — such as asking a candidate to draft a sample schedule, prepare a suggested shopping list for a specific dietary requirement, or outline how they would handle a described emergency — can reveal a great deal about their approach and competence.
Extended interviews with multiple formats — combining a formal interview, a home visit (without any task completion), and a structured reference conversation — often provide a more rounded picture than a single trial day, with considerably less legal complexity.
None of these approaches are a perfect substitute for direct observation, but they are substantially lower-risk and, when designed thoughtfully, genuinely informative.
A Note on Fairness and Professional Standards
Beyond legal compliance, there is a straightforward ethical dimension to this question. Candidates who attend trial days invest their time, their travel costs, and in some cases their annual leave entitlement. Asking them to perform genuine work without pay — or with payment conditional on a job offer — is not consistent with the standards of a professional employer.
Household employers who treat prospective staff fairly during the recruitment process tend to attract higher-quality candidates and build stronger working relationships from the outset. The way you conduct a trial day sends a clear signal about the kind of employer you are — and candidates notice.
