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Selling or Letting a Property with a Pest History: What Must You Disclose?
Selling or letting a property with a pest history does not require you to volunteer every detail, but it does require you not to mislead. Answer the property information form truthfully, tell an incoming tenant about a live or recent problem, and hand over the treatment records. A treated, documented infestation is a far safer disclosure than a concealed one.
What does a seller have to disclose about a past infestation?
A seller of a home in England and Wales is not generally obliged to volunteer information about a past infestation, but must not give a false or misleading answer to a question that is asked.
That second duty matters because conveyancing runs on a written questionnaire. The Law Society's TA6 property information form, used in most residential sales, asks direct questions about the property's condition, about disputes and complaints, and about notices affecting it. Once a direct question is asked, an untrue answer is a positive statement rather than a silence. A false statement of fact that induces a buyer to enter the contract can give rise to a claim for damages against the seller, and in some circumstances to the contract being set aside. The exposure therefore sits in the answers, not in the silence.
A second layer applies to traders. A trader dealing with consumers must not mislead them, either by an active statement or by leaving out information a consumer needs to make a decision. A private individual selling the house they live in is not normally a trader, so that duty usually falls on the estate agent or the professional landlord rather than the homeowner.
Why is a treated and documented infestation a better disclosure than a concealed one?
A treated and documented infestation is a better disclosure because the paperwork converts an open worry into a closed job with dates on it. A buyer told "there were mice under the kitchen units, here is the report, here is what was sealed, here is the last visit with no activity" has a finished story. A buyer who finds droppings behind a kickboard on the second weekend has an unfinished one, and a reason to ring their solicitor. Concealment also fails on its own terms: gnawing on cable sheathing, monitor units left in a loft and fresh mastic around a soil stack are exactly what a surveyor looks at.
What does a landlord have to disclose about a known pest problem?
A landlord letting a property with a known pest problem is not dealing with a disclosure question so much as a condition question, and it is one they cannot let their way out of. A landlord of a short residential tenancy must keep the structure and exterior of the dwelling in repair, along with the installations for water, gas, electricity, sanitation and heating. Where pests are entering through disrepair — a defective airbrick, a broken drain, gaps at a soil pipe, a rotten door threshold — the entry route is the repairing obligation, whatever the tenancy agreement says about pest control. That obligation is implied into the tenancy and cannot be signed away, so a clause making the tenant responsible for "all pest control" does not move it. In converted Victorian terraces in Hackney, where flats share floor voids and pipe runs, that entry route is often somewhere the tenant cannot reach.
What can a council do about pests in a let property?
A council can act on pests in a let property in its own right, without waiting for the tenant to bring a claim. The Housing Health and Safety Rating System (HHSRS) treats domestic hygiene, pests and refuse as a rated hazard, and a council environmental health team can inspect the dwelling, score the hazard and enforce where the score is high enough. The usual instrument is an improvement notice requiring specified works within a stated period. For a licensable house in multiple occupation, condition is also a licensing matter, so the same infestation can put the licence in issue as well as the tenancy. Telling an incoming tenant about a live problem and the plan to fix it costs a conversation; not telling them risks the repairing claim, the council inspection and the tenancy relationship at once.
What is a prospective buyer or tenant entitled to ask, and what does a straight answer look like?
A prospective buyer or tenant can ask anything they like about pest history, and a seller or landlord may decline to answer — but an answer given must be true. A straight answer has four parts: what the pest was, when it was found, what was done, and what has happened since.
For example: "Mice were found under the kitchen units in January. A contractor treated it over three visits, the last in February, and sealed the gaps at the pipe runs. Nothing has been seen since, and the reports are in the pack." Compare that with "bit of a mouse problem a while back, all sorted": the first is verifiable, the second invites the question again at a worse moment.
What must be disclosed in each situation?
The obligation shifts with who is selling or letting, what was asked, and how live the problem is.
| The situation | What normally must be disclosed | The anchor | What to have ready |
|---|---|---|---|
| Selling; infestation treated and closed some time ago | An accurate answer where the form or the buyer asks | The duty not to answer a question falsely | Treatment reports with dates, proofing invoices |
| Selling; infestation live at the point of sale | The infestation, accurately, once a question touches it | The duty not to answer a question falsely | Contractor's current report, plan for outstanding visits |
| Letting; known pest problem before the tenancy begins | The problem and what is being done about it | The landlord's repairing obligation for structure, exterior and installations | Report, treatment dates, repair schedule |
| Letting a licensable house in multiple occupation | The same, plus the condition record the licence expects | HMO licensing, and the HHSRS pest hazard | Inspection and treatment log |
| Estate agent aware of a pest history | Material information to buyers and tenants | A trader's duty not to mislead a consumer by act or omission | Written instruction from the seller on what enquirers are told |
What should you keep, and why is that file an asset rather than a liability?
Keep the treatment reports, the product records and the proofing invoices, because that file is evidence that a problem was identified and closed. Four things are worth holding:
- The technician's written report for every visit, naming the species, the locations treated and the product applied. A professional applying a pesticide works from a written risk assessment and keeps records of what was used and where, so the paperwork should already exist.
- The proofing invoice, describing what was sealed, meshed or replaced. Proofing is a physical improvement to the building and reads as one.
- Any guarantee document, with its dates and terms exactly as written.
- The closing visit note recording no further activity.
That file answers the buyer's real question, which is not "was there ever a pest here" but "is it dealt with". 247 Pest Control publishes pest inspection from £62 as a starting point for a straightforward domestic inspection, and names pest type, property size, infestation level, visits needed, treatment method, access and urgency among the variables that move a figure.
How do you close the file before the property goes on the market?
Book the inspection before the photographs are taken, because a survey gives an honest answer its two facts: what is there now, and what work is outstanding.
247 Pest Control states that same-day attendance is available across London and that it responds to emergency enquiries 24/7, while noting that attendance time cannot be identical for every call. The survey settles three things: which pest it is, which treatment suits the property, and the soonest the work can be scheduled. That distinction matters when you are selling or letting a property with a pest history, because a rodent programme or a bed bug treatment is scheduled work with follow-up visits, and the completion date follows from the survey, not from the phone call. How quickly that programme can be completed matters commercially, because a closed file with a final visit on it is the disclosure that sells.
What duty does the estate agent have?
An estate agent is a trader, and must not mislead prospective buyers or tenants — by action or by omission — about information material to their decision to buy or rent. That duty sits on the agent in their own right, separate from the seller's position.
"We won't mention it" is not something an agent can safely agree to. Give the agent the file and a short written summary. Where anyone is unsure how far the duty reaches, that is a question for a conveyancing solicitor on the facts.
Frequently asked questions
Can a buyer sue after completion if the seller hid an infestation?
A buyer may have a claim, but it depends on what was said and relied upon. Silence alone is usually not actionable in a residential sale, because caveat emptor applies to condition. A false answer to a direct question is different, and is the usual route to damages. Outcomes turn on the facts, so a solicitor should assess the specific case.
Can a landlord put pest control on the tenant in the tenancy agreement?
A clause can allocate day-to-day responsibility, but it cannot displace the repairing duty. The landlord keeps the structure, exterior and listed installations in repair, and pests entering through disrepair fall on that side of the line. A council can also assess pests in the dwelling as a rated hazard whatever the agreement says.
Does an estate agent have to tell buyers about a pest problem they know about?
The agent has a duty of their own. A trader must not mislead consumers, by action or by omission, about information material to a decision to buy or rent, and an estate agent is a trader. That is why agents ask sellers for pest history in writing, and why instructing one to conceal a known problem puts them in an impossible position.
Is a treatment guarantee transferable to a buyer?
It depends on the wording of the guarantee document, and many are issued to the named customer rather than to the property. Ask the contractor in writing whether the guarantee passes on sale, and hand that answer over with the file. Never describe a guarantee to a buyer in terms the document itself does not use.