Ecology objections and what the council must consider

An ecology objection to a planning application succeeds on survey adequacy far more often than on the merits of the ecology itself. The authority is under duties it cannot ignore, and the most useful thing an objector can do is show that the information before the council is not good enough to discharge them. Pointing out that the bat survey was carried out in February, or that no survey was done at all, is worth more than an assertion that wildlife will be harmed.

What follows is the framework the case officer is working within, and the points at which a neighbour, parish council or local wildlife group can put something useful into it.

The statutory duties that bite on the authority

Three duties shape how the council has to handle ecology.

Section 40 of the Natural Environment and Rural Communities Act 2006, as amended by the Environment Act 2021, places a biodiversity duty on public authorities in England. The authority has to consider what action it can properly take to further the general biodiversity objective, and then take that action, having regard to any relevant local nature recovery strategy. The duty is about process rather than outcome, which means an objection that shows the authority never turned its mind to the question has traction.

Section 41 of the same Act requires the Secretary of State to publish a list of habitats and species of principal importance in England. Anything on that list is a material consideration, and the list is wider than most people expect: hedgehogs, house sparrows, song thrushes, common toads and several widespread bat species all appear.

Regulation 9(3) of the Conservation of Habitats and Species Regulations 2017 requires a competent authority, which includes a local planning authority determining an application, to have regard to the requirements of the Habitats Directive in exercising its functions. The practical effect, confirmed by the courts, is that where a European protected species is likely to be affected the authority has to engage with the licensing tests rather than leaving them to someone else.

Protected species and the licensing tests

Bats, great crested newts, dormice, otters and natterjack toads are European protected species. Disturbing them, or damaging or destroying a breeding site or resting place, is an offence unless a licence is held, and the licence comes from Natural England rather than from the council.

Three tests have to be satisfied before a licence can be granted: that the development is needed for imperative reasons of overriding public interest or for public health and safety reasons, that there is no satisfactory alternative, and that the action will not be detrimental to the maintenance of the population of the species at a favourable conservation status.

The courts have held that a local planning authority must consider the likelihood of a licence being granted when it determines the application. The leading authorities are Morge v Hampshire County Council [2011] UKSC 2 in the Supreme Court and Woolley v Cheshire East Borough Council in the High Court. So an objection that identifies a European protected species on the site and asks the authority to address the three tests in its report is asking for something the law requires, and the officer's report should answer it.

Birds, badgers and reptiles are protected differently. Nesting birds are protected under the Wildlife and Countryside Act 1981 while nests are in use, badgers and their setts under the Protection of Badgers Act 1992, and widespread reptiles against killing and injury. These do not carry the licensing tests, which makes them weaker as objection grounds, although timing conditions are routinely imposed.

A Protected Species Survey can only be carried out by a suitably licensed ecologist, and any mitigation licence depends on that person's competence and licence. No desk exercise or AI-assisted draft substitutes for it, and an application supported by a survey from someone without the right licence is open to challenge on that basis alone.

Survey adequacy and the survey season

This is where most objections land, because survey standards are published and checkable.

Four questions to ask of any ecology report in an application:

• When was the survey done? Bat emergence and re-entry surveys are seasonal, generally May to September with the optimal window in the summer months, following the Bat Conservation Trust good practice guidelines. Great crested newt environmental DNA sampling runs within a defined spring window. Reptile surveys need warm months with spring and early autumn preferred. Breeding bird surveys need the breeding season. A survey carried out outside the window cannot support a conclusion of absence.
• Was enough done? One dusk visit to a building with high bat roost potential does not meet the published guidance, which scales the number of visits to the assessed potential of the structure.
• How old is it? Ecological baselines go out of date. Professional guidance treats survey data as having a limited shelf life, commonly between eighteen months and three years depending on the receptor, and a report from an earlier abandoned scheme may no longer be usable.
• Does the conclusion follow? A Preliminary Ecological Appraisal that identifies moderate bat roost potential and then recommends no further survey has a gap in it, and that gap is the objection.

Planning practice guidance on the natural environment is explicit that the presence of protected species, and the extent to which they may be affected, should be established before permission is granted. Deferring the survey to a condition imposed before work starts is contrary to that advice, and it is the single most effective point an objector can make, because it is procedural rather than a matter of ecological opinion.

Biodiversity net gain and the gain plan

Mandatory biodiversity net gain applies to most planning permissions in England, phased in from February 2024 for major development and April 2024 for small sites. The scheme requires a minimum ten per cent uplift in biodiversity value measured with the statutory metric, secured for at least thirty years.

Two features matter for an objector.

The condition is deemed, which means it attaches to the permission whether or not the decision notice mentions it. Development cannot lawfully begin until the authority has approved a biodiversity gain plan. So a permission granted without any discussion of biodiversity still carries the requirement, and if work starts before the plan is approved that is a breach of condition, which is enforceable. Understanding what a breach of condition notice achieves is useful before reporting one.

Exemptions are wide, and this is where objections misfire. Householder development is exempt, so a neighbour's extension carries no net gain requirement at all. Self-build and custom build schemes of up to nine dwellings are exempt, and there is a de minimis exemption for development affecting only a very small area of onsite habitat. Check whether the application is exempt before building an objection on net gain.

The statutory metric has to be completed by a competent person, and the Biodiversity Net Gain Assessment is work the Environment Act 2021 regime expects to be done to that standard. Baseline habitat condition assessment is the part most often done badly, because overstating the condition of the existing habitat makes the uplift harder rather than easier, while understating it inflates the apparent gain.

Habitat loss outside designated sites

Objectors tend to look for a designation and give up when there is not one. Several protections work without any designation at all.

Ancient woodland and veteran trees are treated as irreplaceable habitat in national policy, and loss or deterioration should be refused unless there are wholly exceptional reasons. Buffer zones around ancient woodland are standard practice.

Hedgerows have their own regime. Removing a countryside hedgerow needs notification to the authority under the Hedgerows Regulations 1997, and a hedgerow that meets the criteria for importance cannot be removed if the authority serves a retention notice. Hedgerows also count in the biodiversity metric separately from area habitats.

Local Wildlife Sites, Local Nature Reserves and sites identified in a local plan as locally designated carry weight through the development plan rather than through statute. Priority habitat shown on the national priority habitat inventory is a material consideration whether or not the parcel is designated.

Watercourses, ponds and even small areas of species-rich grassland can be priority habitat. Look the site up on the national mapping before writing the objection, and quote what you find.

Why a survey should not be left to a condition

Make this the spine of the objection if the survey is missing or stale. The argument runs in four steps and a planner can lift it straight into a report.

1. The site has features indicating the likely presence of a protected species, which you identify specifically: a building with gaps at the ridge and under hanging tiles, mature trees with cavities, a pond within 250 metres, a hedgerow network, a known roost nearby.
2. National planning practice guidance requires the presence and extent of effect to be established before permission is granted.
3. The authority's duties under regulation 9(3) of the 2017 Regulations and section 40 of the 2006 Act cannot be discharged on the information currently before it.
4. Accordingly the application should not be determined until an adequate survey, carried out in the correct season and to the published guidance, has been submitted and consulted upon.

That is a request for deferral rather than refusal, and officers find it much easier to act on. If permission is granted anyway, read the conditions closely, because what the decision notice controls determines what can be enforced later.

The evidence a neighbour can actually provide

You can supply things no consultant has, and dated observation is worth more than opinion.

Sit outside at dusk in summer and count bats emerging from the building, noting the date, time of first emergence, the part of the building they came from and the approximate number. Three or four evenings over a fortnight produces something an ecologist will take seriously. Photograph nests in use, with the date. Note badger latrines, runs and sett entrances, and their positions. Record swift, house martin and swallow nests under eaves.

Then put the records somewhere official. Local environmental records centres accept records from the public and hold the dataset consultants search, so a record submitted now exists for the next application too.

Finally, check what the applicant said. Compare the ecology report's description of the site with what you can see, and if the report describes a building as having negligible roost potential when it has open soffits and a slipped ridge, say so in those terms and attach a photograph.

This is general guidance rather than legal advice, so check the position with your local planning authority or a qualified professional before relying on it. Ecological surveys and licences require a licensed ecologist, and an AI-assisted draft is only ever a starting point for that professional.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.