What a Natural England mitigation licence lets an ecologist do

A protected species mitigation licence from Natural England authorises acts that would otherwise be criminal offences: capturing a European protected species, disturbing it, or damaging or destroying a breeding site or resting place. It does not relax any of the protection. It permits a defined set of works, carried out in a stated way, under the supervision of a named ecologist, after planning permission has been granted.

Self-builders often expect the licence to be something their ecologist simply obtains. In reality the licence is held by the person doing the development, and the ecologist is named on it as the person responsible for the method. That distinction matters when something goes wrong on site.

Why a licence is needed at all

The Conservation of Habitats and Species Regulations 2017 make it an offence to deliberately capture, injure or kill a European protected species, to deliberately disturb it in ways affecting its survival or breeding, or to damage or destroy a breeding site or resting place. The species list includes all bat species, great crested newt, hazel dormouse, otter, sand lizard, smooth snake and natterjack toad.

The last of those offences is the one that catches ordinary building work. Damaging a resting place is an offence whether or not any animal is present at the time and whether or not you intended it. A bat roost in a roof void is a resting place, and stripping that roof damages it.

So the licence exists as a derogation: a lawful exception granted for a specific project. Anything outside its terms remains an offence. Where no licence is in place and a roost is found mid-works, the correct response is to stop and call the ecologist, not to press on and regularise afterwards.

Badgers sit outside this regime, under the Protection of Badgers Act 1992, with their own licensing route. Nesting birds are protected under the Wildlife and Countryside Act 1981 with no general development licence available at all, which is why bird nesting is managed by timing rather than by licence. Our note on bats in your loft and what a conversion legally requires sets out the householder position in more detail.

Who holds the licence and who is named on it

The applicant is normally the developer, landowner or their agent, because the licence permits them to carry out the development. The ecologist appears on the licence as the named person who has designed the mitigation and who will supervise or carry out the licensable work, together with any registered assistants.

Natural England expects that named ecologist to demonstrate relevant recent experience with the species and the type of work proposed. For bats, several routes exist, including class licences held by registered consultants for lower-impact situations as well as project-specific applications, and our note on bat licences, who holds one and what it allows covers how those routes differ.

One practical consequence. If your ecologist leaves the project, the licence does not simply transfer to whoever you engage next. A change of named ecologist has to be applied for, and the new ecologist will want to review the method statement before putting their name to it. Building a change of consultant into a programme mid-licence is expensive.

A licensed ecologist is legally required for this work under the Conservation of Habitats and Species Regulations 2017. An AI-assisted draft of the survey report or the supporting statement is a starting point for that professional, never a substitute for them. The professional directory is the route for arranging review and sign-off of a draft by a suitably qualified reviewer.

The three tests an application must satisfy

A licence can only be granted where three tests are met, and each has to be evidenced in the application.

The first is purpose. The work must be for imperative reasons of overriding public interest, including of a social or economic nature, or for preserving public health and public safety. For most development this is argued on the social and economic benefits of the scheme, and for a single dwelling it is argued on the housing contribution and the local economic benefit. A weak purpose case is usually a case written in general terms rather than about the specific scheme.

The second is that there is no satisfactory alternative. This is about alternatives to the proposal as it affects the species, so it covers alternative designs, alternative construction methods, alternative timing and alternative layouts as well as alternative sites. The honest answer is often that alternatives were considered and rejected for reasons you should state.

The third is that the action will maintain the favourable conservation status of the species population concerned. This is the one that drives the mitigation design: replacement roosting provision, exclusion methods, receptor sites, habitat creation and post-development monitoring, evidenced against the survey data.

All three have to be satisfied. There is no balancing exercise in which a strong benefit case compensates for weak mitigation.

What the licence permits on site

The licence is specific, and its schedules matter more than its cover page.

It names the site, the species, the acts permitted, the methods to be used, the period of validity, the people authorised, and the mitigation and compensation to be provided. Works outside those terms are unlicensed. The most common breaches are straightforward: work outside the permitted dates, roof stripping by a method other than the one in the method statement, and work carried out when the named ecologist was not present at a stage where attendance was required.

What the licence typically allows is a sequence rather than a single act. Soft-strip under supervision, exclusion or capture where needed, destruction of the resting place, then installation of replacement provision to the specification in the method statement. Each stage has a trigger and a record.

Keep the licence and method statement on site. An ecological clerk of works cannot enforce a document nobody on the crew has read.

Conditions, timing and reporting

Licence conditions bite for years after the works finish, and most of them concern evidence.

Expect requirements to carry out the mitigation exactly as specified, to keep records of every licensable act with dates and personnel, to notify Natural England of changes, and to submit a report at defined intervals covering what was done and what the monitoring found. Replacement roost provision often has to be checked and reported for several years, and on larger schemes a monitoring plan runs alongside.

Timing conditions are where planning programmes and licences collide. Roost destruction is normally restricted to periods when bats are least likely to be present, which excludes both the maternity season and, for some situations, hibernation. A licence granted in September may not permit the works you wanted to do in October.

Survey currency is the other timing trap. Natural England expects the mitigation to be based on survey data that still reflects the site, and survey results age. Our note on checking whether a survey is still valid sets out how authorities and regulators treat older data.

Where the licence sits against planning permission

The licence comes after the permission, in almost every case. Natural England will normally want the relevant planning permission in place, and any ecology-related conditions addressed, before granting a mitigation licence, because it needs to know what development is actually authorised.

That does not let the planning authority ignore the species question. The courts have made clear that a local planning authority has to have regard to the Regulations when deciding an application, and where a licence is plainly going to be needed, the authority should consider whether the derogation tests are likely to be met. That is why councils ask for survey results and a mitigation strategy at application stage rather than accepting a condition requiring surveys later.

The practical arrangement is a Protected Species Survey and a mitigation strategy submitted with the application, a planning condition requiring the approved mitigation to be implemented, and the licence obtained afterwards to make the works lawful. A condition that simply requires a survey before commencement is increasingly refused as inadequate where presence is likely.

What a licence does to your programme

Assume a season, not a month. The sequence on a small scheme with bats in the roof runs roughly as follows.

1. Preliminary roost assessment, which can be done at any time of year.
2. Emergence and re-entry surveys where suitability is moderate or high, between May and September with the best results from May to August.
3. Survey report and mitigation strategy submitted with the planning application.
4. Determination, typically eight weeks for a minor application and longer where consultees are involved.
5. Licence application prepared and submitted, with Natural England determining it against its published service standard.
6. Works carried out within the licence dates, with replacement provision installed.
7. Monitoring and reporting for the period the licence sets.

The pinch point is almost always step two. Missing a survey season pushes the whole sequence back a year, and no amount of pressure on the ecologist or the regulator shortens it. Booking the preliminary assessment in the winter before you intend to apply is the single most useful thing a self-builder can do.

Competence questions come up throughout this process, and our note on what competent person means in planning legislation sets out how the term is used across different report types.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. For specialist technical reports, qualified professional input may be required.