Author : Dr Kate Garside
Protect your rental property with surface testing for smoking and drug use
For landlords, protecting a rental property from unauthorised activities is essential—not only to maintain the value of the investment but also to ensure that the property remains a safe and healthy environment for future tenants. One of the more difficult issues landlords face is confirming suspected smoking or drug use within a property when tenants deny it.
This is where surface testing—specifically for cotinine (a nicotine metabolite) and illicit drugs—can provide concrete, objective evidence.
A Landlord’s experience: Using surface cotinine tests
One landlord shared their experience using a surface cotinine test in a rental flat:
"I used it on a flat where I knew the tenants smoked. I could smell it, the walls were all yellow, but the tenant denied it. I did the test three times on different areas of the flat and all came back positive for nicotine. So now we can claim the full redecoration and cleaning from the deposit."
In this case, the landlord was able to confidently present evidence of smoking, which helped support their case when deducting from the tenant’s deposit for professional cleaning and redecoration costs.
What Is a surface Cotinine test?
Surface cotinine tests detect traces of nicotine left on surfaces such as walls, window sills, and furniture. Even if smoking has occurred in the past and the air smells fresh, residue often remains—particularly on porous or painted surfaces. These tests are simple to use and provide rapid, lab-accurate results, helping landlords validate smoking even when tenants deny it.
You can find the AllTest Cotinine Surface Wipe Test Kit here.
Why this matters for landlords
- Deposit claims: Objective test results provide a strong basis for deposit deductions.
- Legal protection: Documented evidence can support any disputes or tenancy breaches.
- Peace of mind: Knowing the full history of property use helps plan appropriate cleaning or refurbishment before new tenants move in.
- Health & safety: Ensures the next occupants aren’t unknowingly exposed to harmful substances.
How landlords can deter smoking in rental properties
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Include a clear No-Smoking Clause in the tenancy agreement
State explicitly that smoking is not allowed indoors and outline the consequences of breaking this rule. -
Highlight the No-Smoking Policy during viewings
Make your expectations clear to prospective tenants right from the start. -
Use prominent No-Smoking signage inside the property
Place tasteful but clear signs in key areas such as the hallway, kitchen, or lounge. -
Offer outdoor smoking solutions when possible
Provide a sheltered outdoor area or ashtray away from windows and doors to encourage smoking outside. -
Install smoke detectors in key areas
Let tenants know that smoke detectors are in place and monitored during inspections. -
Carry out regular property inspections
Conduct inspections every 3–6 months to check for signs of indoor smoking like ashtrays, cigarette butts or ash —make sure this is included in the tenancy agreement. -
Use surface cotinine test kits to deter and detect smoking
Let tenants know you may use nicotine residue tests between tenancies or after suspected breaches. -
Educate tenants on the impact and dangers of smoking indoors
Explain how it affects deposit returns, cleaning charges, and their responsibilities as well as health and safety concerns. -
Enforce Deposit Deductions for Breaches
Make it clear that any smoking-related damage or odour will result in cleaning and redecoration charges deducted from the deposit. -
Choose smoke resistant and washable materials for furnished rentals whenever possible to minimise damage if smoking does occur
Use washable paint, hard flooring, and easily cleaned furnishings that resist smoke absorption. If the rental is fully furnished make sure soft furnishings are machine washable. Opt for wipeable leather type sofas or those with machine washable loose covers.
How surface drug tests could help landlords too
Similar to cotinine testing, surface drug test kits can detect traces of illegal substances such as cocaine, cannabis, methamphetamines, and opioids. These are particularly helpful if:
- There's suspicion of drug use or dealing within a property.
- There are odours or physical signs, but no direct evidence.
- You need support when taking legal or tenancy action.
- You want proof for insurance purposes or safety concerns.
By swabbing surfaces such as countertops, bathroom fixtures, or door handles, landlords can quickly determine whether drugs have been used in the premises, which is crucial when considering cleaning, safety measures, or legal proceedings.
Surface testing for drugs including Cotinine (a by product of Nicotine) is a low-cost, effective way to protect your investment property. Whether you're dealing with suspected smoking or illicit drug use, cotinine and drug surface tests give landlords a reliable tool to gather evidence, resolve disputes, and take action when needed.
Author : Dr Kate Garside