Selling a House with Bats: What You Need to Know

Discovering that bats are roosting in your property can feel like a complication when you are trying to sell. Bats are among the most strictly protected wildlife in the UK, and the legal framework surrounding them can seem daunting at first glance. However, bat roosts are far more common in residential properties than most people realise, and having bats does not prevent you from selling your home.

What matters is understanding your legal obligations, being transparent with buyers, and knowing when specialist advice is needed. This guide covers the law, the practical impact on your sale, and the steps you should take as a seller in England and Wales.

Why bats are legally protected in the UK

All 18 species of bat found in the UK are protected under two key pieces of legislation:

• Wildlife and Countryside Act 1981 — makes it an offence to intentionally kill, injure, or take any wild bat, and to intentionally or recklessly disturb bats in a roost or obstruct access to a roost.
• Conservation of Habitats and Species Regulations 2017 — implements the EU Habitats Directive in UK law (retained post-Brexit) and provides additional protection. It is an offence to deliberately capture, injure, or kill a bat, to deliberately disturb bats, or to damage or destroy a breeding site or resting place (i.e. a roost).

Critically, a bat roost is protected whether or not bats are physically present at the time. Many bat species use different roosts at different times of year — a maternity roost might be occupied from May to August, while a hibernation roost is used from November to March. Even when the roost is unoccupied, the legal protection remains in place. This means you cannot simply wait for bats to leave and then block up entry points or carry out building work.

The penalties for offences involving bats are serious. Under the 2017 Regulations, offences can result in unlimited fines and up to six months' imprisonment per offence. Courts have also ordered remediation work and confiscation of equipment used in the offence.

Types of bat roost and what they mean for your property

Not all bat roosts are the same, and the type of roost in your property affects both the legal implications and the practical impact on your sale. Ecologists classify roosts by their function:

The type and size of roost will influence how Natural England assesses any licence application and what mitigation measures are required. A maternity roost with a large colony will attract more scrutiny than a day roost used by a single pipistrelle bat.

What constitutes a criminal offence

Understanding exactly what the law prohibits is important for sellers, particularly if you are planning any preparatory work on the property before listing. The following actions are criminal offences if carried out without a licence:

• Killing, injuring, or capturing any bat, whether deliberately or as the foreseeable result of an action such as demolition or building work.
• Deliberately disturbing bats — this includes any action that impairs their ability to survive, breed, or rear young, or that significantly affects their local distribution or abundance.
• Damaging or destroying a roost — any physical alteration to a roost site, including blocking access points, removing roof tiles where bats enter, filling crevices, or demolishing a structure that contains a roost.
• Obstructing access to a roost — preventing bats from reaching their roost, for example by installing mesh over entry points or carrying out work that blocks flight paths.
• Reckless disturbance — under the Wildlife and Countryside Act 1981, even reckless (not just deliberate) disturbance of bats in a roost is an offence. This means that proceeding with work without checking for bats when you ought reasonably to have done so can constitute an offence.

The recklessness provision is particularly important for sellers planning renovations or repairs before marketing. If your property has features that could support roosting bats — loft spaces, older roof structures, hanging tiles, weatherboarding, or outbuildings— you should commission a preliminary roost assessment before starting any work that could affect these areas.

Ecological surveys: what they involve and when to get one

An ecological survey is the essential first step if you suspect bats may be present in your property, or if building work is planned that could affect potential roost sites. Surveys follow a two-stage process set out in the Bat Conservation Trust's Bat Surveys for Professional Ecologists: Good Practice Guidelines (4th edition, 2023).

Stage 1: Preliminary roost assessment (PRA)

A licensed ecologist visits the property and carries out a detailed inspection of the building and its surroundings. They look for physical evidence of bats — droppings, urine staining, scratch marks, feeding remains (insect wings), and potential access points. They also assess the building's suitability for roosting based on its age, construction, location, and surrounding habitat.

A PRA can be carried out at any time of year and typically costs between £300 and £600 depending on the size and complexity of the property. The ecologist will classify the building's bat roost potential as negligible, low, moderate, or high. If the potential is negligible, no further surveys are needed. If the potential is low, moderate, or high — or if evidence of bats is found — further surveys are recommended.

Stage 2: Emergence and re-entry surveys

These surveys involve ecologists watching the building at dusk and dawn to observe bats emerging from or returning to the building. At least two survey visits are required for buildings with moderate bat roost potential, and three for buildings with high potential. The surveys must be carried out between May and September, with at least one survey between May and August.

Each emergence survey visit typically costs £300 to £500, depending on the number of surveyors needed (larger buildings may require multiple surveyors to cover all elevations). A full suite of surveys for a property with confirmed bat activity can therefore cost between £600 and £1,500 in total.

The seasonal restriction on emergence surveys is a critical consideration for your sale timeline. If you discover in October that bats may be present and a full survey is needed, you will have to wait until the following May to complete the survey process. Planning ahead is essential.

Natural England licensing

If building work is needed that would affect a bat roost —whether you are carrying out the work before selling or the buyer plans to do so after purchase — a European Protected Species (EPS) mitigation licence from Natural England is required. The licence permits activities that would otherwise be criminal offences, subject to conditions.

To obtain a licence, three tests must be satisfied:

1. The work is for a legitimate purpose — such as preserving public health or safety, or for imperative reasons of overriding public interest (including social or economic reasons). Domestic building work typically qualifies.
2. There is no satisfactory alternative — the applicant must demonstrate that the proposed approach is the only reasonable way to achieve the objective while minimising impact on bats.
3. The action will not harm the conservation status of the species — the mitigation plan must show that the local bat population will be maintained.

The licence application must be prepared by a licensed ecologist and submitted to Natural England. It includes a detailed mitigation plan setting out how the impact on bats will be minimised — for example, timing the work to avoid the maternity season, providing alternative roosting features (bat boxes), or modifying the building design to retain roost access. The licensing process typically takes 30 working days from submission of a complete application.

Licence application fees were abolished in 2023, so the main cost is the ecologist's fee for preparing the application and overseeing the mitigation work, which can range from £1,000 to £3,000 or more depending on the complexity of the project.

Impact on building work and renovations

The presence of a bat roost does not mean you cannot carry out building work, but it does mean that certain works require prior assessment and potentially a licence. Common building projects that may be affected include:

• Loft conversions — if bats roost in the loft space or access it through the roof structure, a loft conversion will require a licence and a mitigation plan that provides alternative roosting provisions.
• Re-roofing — removing roof tiles or slates can destroy access points and disturb roosting bats. A PRA should be carried out before any roofing work begins.
• Demolition — demolishing a building or structure that contains a bat roost requires a licence and a comprehensive mitigation strategy.
• Timber treatment — chemical timber treatments in loft spaces or roof voids can be toxic to bats. Only bat-safe products should be used in areas where bats may be present.
• External repairs — work on fascias, soffits, bargeboards, weatherboarding, or hanging tiles can affect roosting and access points.
• Lighting — installing external lighting near roost access points can disturb bats and constitute an offence if it causes them to abandon the roost.

If you are planning any of these works before selling, commission a preliminary roost assessment first. The cost of a PRA (£300 to £600) is negligible compared to the potential fines and delays that could result from an unlicensed disturbance.

Disclosure on the TA6 Property Information Form

As a seller in England or Wales, you must complete the TA6 Property Information Form honestly. Several sections of the TA6 are relevant when bats are present:

• Section 7 (Environmental matters) — asks whether you are aware of any environmental matters that affect the property. A bat roost is an environmental matter that must be disclosed.
• Section 4 (Alterations, planning, and building control) — if you have obtained a Natural England licence for work affecting a bat roost, or if you are aware that previous owners did so, this should be disclosed here along with any licence conditions that remain in force.
• Section 7.3 (Environmental matters — protected species) — specifically asks about protected species. If you know bats are present, you must confirm this.

Your disclosure should be factual and proportionate. State what you know — for example, that you have observed bats entering the roof space in summer months — and provide any ecological survey reports or licence documentation you have. If you have never had a formal survey but have observed bats, say so. Do not speculate about the species or the significance of the roost — leave that to the ecologist. For broader guidance on your obligations, see our guide on what to disclose when selling.

How bats affect the sale process

The presence of bats in a property can affect the sale at several stages. Understanding the typical sequence helps you prepare:

1. TA6 disclosure. You disclose the presence of bats on the property information form. The buyer and their solicitor review this information.
2. Buyer enquiries. The buyer's solicitor raises questions about the bat roost — what species, what type of roost, whether a survey has been carried out, and whether any licence has been obtained. Having an ecological survey report ready to provide at this stage significantly reduces delays.
3. Survey impact. If the buyer commissions a HomeBuyer Report or Building Survey, the surveyor may note evidence of bats and recommend an ecological survey before the buyer proceeds. This can cause a delay of several weeks — or several months if it is outside the May to September survey season.
4. Mortgage lender review. The lender's valuer considers whether the bat roost affects the property's value or the buyer's intended use. In most cases, a bat roost does not affect the mortgage, but if the buyer has disclosed plans for a loft conversion and the roost prevents this, the lender may adjust the valuation.
5. Possible renegotiation. The buyer may renegotiate the price if the bat roost imposes restrictions they had not anticipated, particularly if additional survey or licensing costs are involved.

The best way to minimise disruption is to commission your own ecological survey before marketing the property. An upfront survey gives you control of the information and prevents the buyer's surveyor from introducing uncertainty into the process.

Buyer concerns and lender attitudes

Buyers unfamiliar with bats tend to have two main concerns: whether bats will cause practical problems (noise, droppings, smell) and whether the legal protections will prevent future building work.

In reality, most bat species found in UK homes are small pipistrelles that produce minimal noise and very small quantities of droppings. Bat droppings are dry, crumbly, and unlike mouse or rat droppings do not pose a significant health risk. The practical nuisance from a typical bat roost is considerably less than most buyers imagine.

The more legitimate concern is about future building work. Buyers planning a loft conversion, major roof work, or extension may worry that a bat roost will prevent or delay their plans. This is where an ecological survey is invaluable. A survey report that clearly states the type of roost, the species involved, and the implications for planned work allows the buyer to make an informed assessment rather than making assumptions.

Mortgage lenders generally take a pragmatic view. Most high street lenders will lend on a property with a bat roost provided the surveyor or valuer confirms that the roost does not materially affect the property's structural integrity, value, or usability. Specialist or heritage properties with significant roosts (such as a listed barn with a large maternity colony) may face more scrutiny. If you are selling a listed building with bats, both the listing and the protected species need to be addressed in the sale documentation.

Practical advice for sellers

If you know or suspect that your property has bats, the following steps will put you in the strongest position when you come to sell:

1. Commission a preliminary roost assessment. This is the single most useful step you can take. A PRA from a licensed ecologist (£300 to £600) establishes whether bats are present, what type of roost exists, and what this means for the property. If no bats are found, the report provides reassurance to buyers. If bats are confirmed, you have the information needed to manage the sale process effectively.
2. Time the survey correctly. If a full emergence survey is needed, it must be carried out between May and September. If you are planning to sell, commission the PRA early enough that any follow-up surveys can be completed within the season. Waiting until autumn means a potential delay of six months or more.
3. Disclose honestly on the TA6. State what you know about bats in the property, provide copies of any survey reports, and do not downplay or omit the information. Honest disclosure protects you legally and builds trust with the buyer.
4. Provide the survey report in your sale pack. If you have an ecological survey, include it in the information provided to prospective buyers. This allows them to assess the situation before making an offer, reducing the risk of renegotiation or withdrawal later in the process.
5. Do not attempt DIY bat removal or exclusion. It is illegal to block access points, install one-way excluders, or use deterrents to persuade bats to leave without a licence. If bats are causing a genuine problem, contact the Bat Conservation Trust helpline on 0345 1300 228 for advice.
6. Brief your estate agent. Make sure your agent knows about the bats and has a copy of the survey report. An agent who can confidently explain the situation to prospective buyers is far more effective than one who is caught off guard by questions.

Bats and listed buildings

Listed buildings are disproportionately likely to have bat roosts because older buildings offer the crevices, voids, and undisturbed spaces that bats favour. If you are selling a listed property with bats, you face a dual regulatory framework: the planning and listed building consent regime and the wildlife protection legislation.

Any work to a listed building that affects its character requires listed building consent from the local planning authority. If that same work also affects a bat roost, you will need both listed building consent and a Natural England licence. The two regimes operate independently — having one does not exempt you from the other.

Natural England and Historic England have a joint protocol for managing the overlap between heritage and wildlife protection. If you are in this situation, your ecologist and conservation officer should work together to develop a solution that respects both the building's significance and the bat population.

Sources

• Wildlife and Countryside Act 1981 — legislation.gov.uk/ukpga/1981/69
• Conservation of Habitats and Species Regulations 2017 — legislation.gov.uk/uksi/2017/1012
• Natural England — Bat mitigation guidelines and European Protected Species licensing: gov.uk/guidance/bats-protection-surveys-and-licences
• Bat Conservation Trust — Bat Surveys for Professional Ecologists: Good Practice Guidelines, 4th edition (2023): bats.org.uk
• Bat Conservation Trust — National Bat Helpline and advice for householders: bats.org.uk/advice
• CIEEM (Chartered Institute of Ecology and Environmental Management) — Guidelines on ecological impact assessment: cieem.net
• Historic England and Natural England — Bats in Traditional Buildings (joint guidance): historicengland.org.uk
• Law Society — TA6 Property Information Form, 4th edition (2020)

Frequently asked questions