A Request That Seems Simple — But Rarely Is
Imagine your personal assistant contacts you a week before a planned holiday to let you know they have arranged for a friend or colleague to step in and cover their duties while they are away. On the surface, this might appear a thoughtful and practical gesture. In reality, it touches on some of the most legally sensitive territory in employment law, and an employer who responds without careful consideration may inadvertently alter the nature of the working relationship in ways that are difficult to reverse.
The question of whether a worker has the right to send a substitute is not merely an operational matter. It goes to the very heart of employment status — a classification that determines what rights and protections apply to the working arrangement.
Employment Status and the Substitution Clause
Under UK employment law, there are three principal employment statuses: employee, worker, and self-employed contractor. One of the defining features of genuine self-employment is the right to send a substitute. If an individual can send someone else to perform their duties without the engager's approval, that is a strong indicator that the arrangement is one of self-employment rather than employment.
HMRC and employment tribunals look carefully at substitution rights when determining employment status. If a personal assistant's contract includes — or if the employer's conduct implies — an unfettered right to send a replacement, there is a real risk that the PA's employment status could be reclassified. This matters because employees and workers carry statutory protections and entitlements that self-employed contractors do not: unfair dismissal rights, holiday pay, and National Insurance obligations, among others.
Conversely, if an employer has always insisted on personal service — meaning only the named PA performs the duties — this reinforces employee status. Allowing a substitute, even informally and on a single occasion, can introduce ambiguity into that picture.
What Happens When an Unvetted Person Enters Your Home
Beyond the question of employment status, there is the immediate and practical concern of household security. A personal assistant working in a private home has typically been subject to a structured recruitment process: references checked, identity verified, and — where relevant — a Disclosure and Barring Service (DBS) check completed. A substitute proposed by the PA will have undergone none of these checks.
This is not a theoretical risk. The substitute will have access to the employer's home, potentially to vulnerable individuals within it, and almost certainly to confidential information about the household's routines, security arrangements, and personal affairs. In situations where the PA's role involves the care of a child, an elderly person, or a person with a disability, the safeguarding implications are particularly acute.
Employers should also consider their home insurance policy. Many household policies include provisions relating to domestic staff, and some explicitly require that individuals working in the property have been engaged directly by the homeowner. Permitting an unapproved third party to enter and work in the home — particularly if they cause damage or are involved in an incident — could affect the validity of a claim.
The Insurance and Liability Gap
A related concern is employer's liability insurance. Household employers are required by law to hold employer's liability insurance if they employ someone who is not a close relative. This policy covers claims arising from injury or illness sustained by an employee in the course of their duties.
If a substitute worker is injured while covering the PA's duties, the position is legally uncertain. The substitute is not the employer's employee, and the employer may not be covered under their existing policy. At the same time, the substitute may seek to argue that a de facto employment relationship existed, particularly if they were paid by the employer and worked under the employer's direction. The resulting liability gap could be costly.
How to Respond to a Substitution Request
The appropriate response to a request of this kind is neither a flat refusal nor a casual agreement. It is a structured, written response that protects the employer's position while treating the PA fairly.
In the first instance, employers should clarify whether the PA's contract contains any reference to personal service. Most well-drafted household employment contracts will include a clause confirming that the PA is engaged to perform their duties personally and that the arrangement does not include a right of substitution. If this clause is present, the employer is on firm ground in declining the request.
If the contract is silent, the employer should still proceed cautiously. A written response acknowledging the request, declining to approve an informal arrangement, and offering to discuss alternative solutions — such as agreeing a period of unpaid leave, adjusting the PA's hours around the absence, or assisting with finding a vetted temporary worker through a reputable agency — demonstrates both fairness and professionalism.
Under no circumstances should an employer simply agree verbally and allow an unknown individual to begin working in the home without any formal process.
Establishing a Written Policy
For employers who wish to address this matter proactively — particularly those whose PA's role involves regular or unpredictable absences — it is worth incorporating a clear substitution policy into the household staff handbook or the employment contract itself.
Such a policy might include the following provisions:
- A confirmation that the PA is engaged on the basis of personal service and has no contractual right to send a substitute.
- A statement that any request for a replacement worker must be made in writing and approved by the employer in advance.
- A requirement that any approved substitute undergoes identity verification and, where appropriate, a DBS check before commencing duties.
- Clarification that any approved substitute will be engaged directly by the employer, not by the PA, and that the PA bears no financial or contractual responsibility for the substitute's conduct.
This final point is important. If the employer does agree to a substitute on an exceptional basis, they should engage that individual directly — even informally — rather than allowing the PA to act as an intermediary. This avoids the creation of an unintended sub-contracting arrangement and keeps the liability position clear.
Flexibility Without Ambiguity
None of this is to suggest that household employers must be inflexible in the face of genuine operational difficulties. There will be occasions when a PA's absence creates real difficulties, and employers may legitimately wish to explore practical solutions. The key is to manage those solutions through proper channels: engaging a vetted temporary worker through an agency, adjusting the household schedule, or making alternative arrangements that do not compromise security or legal clarity.
The substitute worker question is one where a small amount of foresight — a clear clause in the contract, a straightforward written policy — can prevent a great deal of difficulty later. Employers who address it now, rather than waiting for the request to arrive, will be far better placed to respond with confidence.
