Modern slavery may not be the first issue landlords associate with rental property.
Most landlords think about rent, repairs, safety checks, tax, insurance, licensing and finding reliable tenants. But rental property can be misused by criminals, including those involved in exploitation, forced labour, trafficking and organised crime.
That does not mean landlords should become suspicious of every tenant or every unusual arrangement.
It does mean landlords should recognise warning signs and understand when a property, tenant, occupier or payment arrangement does not feel right.
The key message is simple: landlords should know who is occupying their property, understand who is paying the rent and take warning signs seriously.
What is modern slavery?
Modern slavery is a broad term.
It can include:
- forced labour;
- human trafficking;
- criminal exploitation;
- domestic servitude;
- sexual exploitation;
- forced criminal activity;
- debt bondage;
- coercion and control;
- exploitation of vulnerable people.
In a rental property context, the landlord may not see the full picture.
The property may be used to house exploited people, hide criminal activity, run an illegal business, support cannabis cultivation, accommodate workers in poor conditions or control vulnerable occupiers.
A landlord may not be involved in the exploitation, but the property can still become part of the problem.
Why landlords need to be aware
Rental property can be attractive to criminals because it provides space, privacy and a legitimate-looking address.
A property may be used for:
- overcrowded worker accommodation;
- cannabis cultivation;
- illegal subletting;
- brothels;
- forced labour accommodation;
- storage of illegal goods;
- false tenancy arrangements;
- money laundering;
- identity fraud;
- unsafe temporary housing;
- exploitation of vulnerable occupiers.
A landlord who ignores warning signs may face serious practical, legal, financial and reputational problems.
These may include property damage, police involvement, insurance issues, possession problems, licensing breaches, rent loss, council enforcement and difficulty explaining how the tenancy was allowed to continue.
Red flags before the tenancy starts
Some warning signs can appear before the tenancy begins.
Landlords and agents should be cautious where:
- the applicant is not clear about who will live at the property;
- the person paying rent is not the person who will occupy;
- one person speaks for all proposed occupiers;
- occupiers appear reluctant to speak for themselves;
- documents are inconsistent;
- the applicant wants to avoid normal checks;
- the applicant offers unusually large rent in advance;
- payment is offered in cash without a clear reason;
- the move-in is unusually urgent;
- the applicant shows little interest in the property;
- the applicant avoids questions about employment or income;
- a company or third party is involved but the arrangement is unclear;
- the proposed use does not match the property type.
One red flag does not prove wrongdoing. Several red flags together should prompt caution.
Who is actually occupying?
Landlords should know who is living in the property.
This matters for:
- right to rent checks;
- licensing;
- overcrowding;
- insurance;
- fire safety;
- council tax;
- tenancy management;
- safeguarding;
- repairs;
- possession;
- criminal property risk.
A tenancy may be granted to one person, but the property may later be occupied by several others.
If the landlord never checks, exploitation may continue unnoticed.
Landlords should keep clear records of named tenants, permitted occupiers and inspection findings.
One person controlling others
A common warning sign is one person controlling the arrangement.
This may include:
- answering all questions for other adults;
- holding documents for others;
- controlling communication;
- paying all rent on behalf of unrelated people;
- refusing to let other occupiers speak;
- insisting that only they deal with the landlord;
- becoming aggressive when asked reasonable questions;
- changing the list of occupiers without explanation.
There may be innocent explanations, but control and silence can be signs of exploitation.
Landlords should be careful, professional and alert.
Unclear employment or worker accommodation
Some rental arrangements involve workers.
This may be legitimate, especially where an employer provides accommodation.
However, landlords should be cautious where:
- the employer is vague;
- workers change frequently;
- occupiers do not appear to know the tenancy terms;
- rent is deducted from wages;
- several workers are housed in cramped conditions;
- there is pressure to avoid paperwork;
- the company will not identify occupiers;
- the property is used as accommodation for rotating workers;
- the number of occupiers increases without consent;
- the arrangement resembles an unlicensed HMO.
Worker accommodation can create planning, licensing, insurance, fire safety and exploitation risks.
Company lets and third-party arrangements
Company lets can be legitimate, but they can also hide who is actually living in the property.
Landlords should understand:
- who the company is;
- who controls it;
- who will occupy the property;
- whether occupiers will change;
- whether the company will sublet;
- whether rent is paid from company funds;
- whether the mortgage allows company lets;
- whether insurance covers the arrangement;
- whether the lease allows it;
- whether the property may become an HMO.
A landlord should not hand over control of the property without understanding the real use.
Rent-to-rent
Rent-to-rent arrangements can create significant risk.
A landlord may grant an agreement to an operator who then places occupiers in the property.
If the operator behaves badly, the landlord may still face consequences.
Risks include:
- unauthorised HMOs;
- overcrowding;
- unsafe conditions;
- unknown occupiers;
- illegal subletting;
- benefit or rent fraud;
- exploitation of vulnerable people;
- poor property management;
- planning breaches;
- insurance problems;
- possession complications.
Landlords should carry out careful checks before allowing anyone else to control occupation.
Overcrowding
Overcrowding can be a warning sign.
Landlords should be alert to:
- mattresses in living rooms;
- bedding in kitchens or storage areas;
- locks on internal doors;
- many shoes, coats or bags;
- excessive waste;
- multiple people coming and going;
- high utility use;
- neighbours reporting unusual occupation;
- rooms being subdivided;
- personal belongings belonging to people not on the tenancy.
Overcrowding may indicate illegal subletting, HMO breaches, poor management or exploitation.
It also creates fire safety and health risks.
Cannabis farms and criminal exploitation
Rental property can be used for cannabis cultivation or other criminal activity.
Warning signs may include:
- covered or blacked-out windows;
- strong or unusual smells;
- excessive condensation;
- tampered electrics;
- humming sounds;
- powerful lighting;
- refusal of inspections;
- tenants always unavailable;
- rent paid in cash;
- visitors at odd times;
- damage to ceilings or walls;
- unusual heat or humidity;
- neighbours reporting concerns;
- security changes without permission;
- blocked letterboxes or doors.
Cannabis cultivation can involve organised crime and exploitation.
It can also cause major property damage and insurance problems.
Refusal of access
A tenant refusing access is not automatically suspicious.
Tenants have rights to quiet enjoyment and landlords must follow proper access procedures.
However, repeated refusal of access can become a concern where it is combined with other warning signs.
Examples include:
- avoiding every inspection;
- refusing safety checks;
- claiming to be away for long periods;
- never answering the door;
- changing locks without consent;
- providing excuses at the last minute;
- allowing access only to certain rooms;
- visible changes from outside the property.
Landlords should keep records and take advice where access problems become serious.
Neighbour reports
Neighbours often notice problems before landlords do.
Reports may include:
- many people coming and going;
- late-night activity;
- vans arriving frequently;
- strong smells;
- excessive rubbish;
- covered windows;
- loud machinery;
- people appearing distressed;
- people sleeping in unsuitable areas;
- repeated anti-social behaviour;
- suspected subletting.
Landlords should not act on gossip alone, but neighbour reports should not be dismissed automatically.
They may justify inspection, further enquiries or professional advice.
Payment red flags
Payment arrangements can also indicate risk.
Warning signs include:
- large cash payments;
- rent paid by someone unrelated to the tenant;
- money coming from multiple accounts;
- unexplained overseas payments;
- rent paid by a company with no clear link;
- overpayments followed by refund requests;
- rent paid despite the tenant apparently having no income;
- pressure to avoid bank transfer;
- refusal to provide ordinary financial information;
- payment patterns that do not match the tenancy.
Landlords should understand who is paying rent and why.
Documents and identity concerns
Identity issues may point to wider risk.
Landlords should be careful where:
- documents look altered;
- names do not match;
- addresses change repeatedly;
- the applicant refuses ID checks;
- one person produces documents for several others;
- occupiers do not appear to understand the documents;
- right to rent checks are resisted;
- references cannot be verified;
- employment details are vague;
- the applicant wants to move in before checks are complete.
Proper referencing and right to rent checks help reduce risk.
Vulnerable occupiers
Modern slavery often involves vulnerable people.
Landlords may notice occupiers who:
- appear fearful or withdrawn;
- do not speak for themselves;
- seem unsure where they live;
- appear to have no control over documents or money;
- are transported to and from the property by someone else;
- appear malnourished, exhausted or distressed;
- avoid eye contact;
- do not know the tenancy terms;
- are living in poor or cramped conditions;
- are reluctant to explain their situation.
Landlords should not interrogate vulnerable people, but they should take concerns seriously.
Safeguarding and immediate danger
If someone appears to be in immediate danger, landlords should contact emergency services.
Where there is concern about exploitation, trafficking or criminal control, landlords should seek appropriate advice and report through the proper channels.
Landlords should avoid putting themselves, tenants or occupiers at risk by confronting suspected criminals directly.
Where a letting agent is involved, the agent should also be notified.
Record-keeping
Records are important.
Landlords should keep:
- tenancy applications;
- ID and right to rent records where required;
- referencing records;
- names of permitted occupiers;
- tenancy agreement;
- rent payment records;
- inspection notes;
- photographs from inspections;
- neighbour complaints;
- repair reports;
- access requests;
- emails and messages;
- agent correspondence;
- police or council reference numbers where relevant;
- records of advice taken;
- action taken after concerns arise.
If the property is later found to have been misused, records may help show that the landlord acted responsibly.
Inspections
Regular, lawful inspections can help landlords identify problems early.
Inspections may reveal:
- unauthorised occupiers;
- overcrowding;
- unsafe sleeping arrangements;
- damage;
- damp and mould;
- blocked escape routes;
- tampered electrics;
- internal locks;
- illegal alterations;
- evidence of commercial use;
- signs of criminal activity.
Inspections should be reasonable, properly notified and recorded.
The aim is not to harass tenants. It is to manage the property responsibly.
Repairs and contractor visits
Contractors may notice issues during repairs.
They might report:
- many mattresses;
- unusual wiring;
- blocked windows;
- unsafe appliances;
- evidence of overcrowding;
- strong smells;
- people appearing distressed;
- rooms they were not allowed to enter;
- damage inconsistent with ordinary use.
Landlords should encourage contractors to report serious concerns.
A contractor report may be an important early warning.
Fire safety risks
Modern slavery and exploitation risks often overlap with fire safety risks.
Overcrowding, locked rooms, blocked exits, illegal conversions and poor electrical work can all create danger.
Landlords should be alert to:
- blocked escape routes;
- bedroom doors with padlocks;
- overloaded sockets;
- extension leads everywhere;
- cooking facilities in bedrooms;
- missing smoke alarms;
- covered detectors;
- unsafe heaters;
- combustible materials stored in hallways;
- tampered consumer units.
Fire safety concerns should be addressed promptly.
Licensing and HMO risk
A property may become an HMO without the landlord intending it.
If several unrelated people occupy the property, HMO rules may apply.
This can affect:
- licensing;
- fire safety;
- room sizes;
- amenities;
- management duties;
- council enforcement;
- rent repayment order risk;
- insurance;
- mortgage conditions;
- planning.
Landlords should not assume that because the tenancy names one or two people, the actual occupation cannot create HMO issues.
Insurance risk
Insurance can be affected if the property is used unlawfully or materially differently from what the insurer was told.
Problems may arise where:
- the property is overcrowded;
- criminal activity takes place;
- the property becomes an HMO;
- tenants change locks;
- inspections are not carried out;
- electrical systems are tampered with;
- damage results from illegal use;
- the property is used commercially;
- the landlord ignored warning signs.
Landlords should notify insurers where serious issues arise and follow policy conditions.
Mortgage and lease risk
Mortgage and lease terms may also be affected.
A lender may not permit:
- HMOs;
- company lets;
- rent-to-rent;
- commercial use;
- short-term accommodation;
- supported accommodation;
- unlicensed occupation;
- high occupancy.
A lease may restrict subletting, business use, nuisance, alterations, common parts, overcrowding or short-term stays.
Modern slavery red flags may therefore also point to mortgage and lease breaches.
What landlords should not do
Landlords should not:
- ignore serious warning signs;
- accept unclear cash arrangements without questions;
- allow unknown occupiers to remain unrecorded;
- avoid inspections because rent is being paid;
- confront suspected criminals alone;
- enter unlawfully;
- harass occupiers;
- remove belongings without proper process;
- cut off utilities;
- change locks unlawfully;
- assume exploitation is impossible because the tenant seems polite.
The response should be lawful, proportionate and properly recorded.
Working with agents
Landlords using letting agents should make sure agents understand risk indicators.
Agents should carry out proper checks, keep records and escalate concerns.
Landlords should ask:
- who has been referenced?
- who will occupy the property?
- were right to rent checks completed?
- who is paying rent?
- are there third-party payers?
- were company details verified?
- what inspection schedule is in place?
- how will neighbour complaints be handled?
- what happens if unauthorised occupation is suspected?
A managed service does not remove the landlord’s need to understand what is happening.
If concerns arise during the tenancy
If warning signs appear, landlords should:
- record the concern;
- review the tenancy file;
- speak to the agent if one is involved;
- arrange a lawful inspection where appropriate;
- check who is occupying the property;
- review payment records;
- take photographs where lawful and relevant;
- seek professional advice;
- contact the council, police or appropriate authorities where necessary;
- avoid confrontation where there may be criminal activity;
- follow proper legal process.
The exact response depends on the seriousness of the concern.
Common landlord mistakes
1. Only checking the named tenant
Landlords should understand who is actually occupying.
2. Accepting rent without asking questions
Regular rent does not prove the property is being used lawfully.
3. Ignoring access refusals
Repeated refusal of access can be a warning sign when combined with other issues.
4. Overlooking neighbour complaints
Neighbours may spot unusual occupation or activity early.
5. Allowing unclear company or rent-to-rent arrangements
The landlord should understand who controls and occupies the property.
6. Failing to inspect
Inspections help identify overcrowding, damage and misuse.
7. Confronting serious criminal concerns alone
Safety should come first.
Practical checklist for landlords
Landlords should:
- carry out proper tenant referencing;
- complete right to rent checks where required;
- identify all adult occupiers;
- understand who is paying rent;
- avoid unexplained cash arrangements;
- check company lets carefully;
- be cautious with rent-to-rent;
- carry out lawful inspections;
- keep inspection records;
- listen to neighbour reports;
- watch for overcrowding;
- investigate repeated access refusals;
- keep rent and communication records;
- act on serious fire safety concerns;
- seek advice where exploitation is suspected;
- contact the appropriate authorities where there is immediate danger or criminal concern.
The key takeaway
Modern slavery may seem far removed from everyday landlord management, but rental property can be misused by criminals and exploiters.
Landlords are not expected to become investigators. But they should recognise warning signs.
Unknown occupiers, overcrowding, unexplained payments, controlling behaviour, repeated refusal of access, neighbour complaints, unsafe living conditions and signs of criminal use should not be ignored.
The safest approach is to know who is occupying the property, keep clear records, inspect lawfully, take concerns seriously and seek help where something appears wrong.
In the modern private rented sector, responsible letting is not only about collecting rent. It is also about understanding how the property is being used.
NetRent does not provide legal advice, safeguarding advice, criminal law advice, mortgage advice, insurance advice or tax advice. This article represents our understanding of rental property modern slavery and compliance issues at the time of writing. Landlords should take professional advice where required.
Telephone: 01352 721300
Email: support@netrent.co.uk