Another person staying at a property is not by itself proof of unlawful subletting. Check the agreement, actual occupation and any licensing or safety implications.
Identify the concern
- Note the source and reliability of the information, separating observation from a neighbour's speculation.
- Check what the contract says about guests, lodgers, additional occupiers and subletting.
- Review any known permission already given by an agent.
Ask and verify proportionately
- Explain the concern and invite the tenant to clarify who lives there and on what basis.
- Arrange any relevant inspection through the lawful access process.
- Check occupancy limits, HMO implications and safety where the household has changed.
Decide the appropriate response
- Correct records if the arrangement is permitted.
- If consent or a variation is needed, assess it under the applicable law and contract.
- For an alleged breach, obtain advice on evidence and the lawful remedy rather than changing locks.
Example: a partner stays regularly
A fictional neighbour reports a new person at the property. Ask whether they are a guest, partner moving in or paying subtenant. Those facts can lead to different legal and licensing questions.
What to do
- Record the factual concern and review the agreement.
- Ask the tenant for an explanation and arrange lawful inspection if needed.
- Get advice before alleging breach or serving notice.
Evidence to keep
- Agreement, permitted-occupier records and relevant factual observations.
- Tenant explanation, lawful inspection findings and advice.
Sources and guidance
- Assured periodic tenancies: landlord guideUK Government · checked 20 October 2026
- Standard occupation contracts: guidance on the termsWelsh Government · checked 20 October 2026
- Being a private landlordScottish Government · checked 20 October 2026
- Data protection advice for small organisationsInformation Commissioner’s Office · checked 20 October 2026