Checking a site against aerodrome safeguarding maps
Officially safeguarded aerodromes carry deposited maps that trigger statutory consultation on height, cranes, bird attractants and radar. Here is how to check a site and what to submit.
Aerodrome safeguarding planning checks start with a map you have to ask for, not one you can browse online. Officially safeguarded aerodromes have safeguarding maps deposited with the local planning authority, and those maps carry the height contours, bird strike areas and technical site zones that force the council to consult the aerodrome operator before it decides. Miss the trigger and the application is not refused so much as stalled, because the council cannot lawfully determine it until the consultee has responded.
For a developer this is a programme risk rather than a policy one. The zones are wide, the triggers are geometric, and the answer is usually mitigation or a condition rather than refusal.
What the safeguarding system protects
Safeguarding exists to keep the physical and electronic environment around an aerodrome usable. Three things are being protected at once: the obstacle limitation surfaces that aircraft climb through and descend into, the radar and radio aids that tell controllers where aircraft are, and the air around the runway that would otherwise fill with birds.
The statutory route runs through a safeguarding direction made by the Secretary of State, with the consultation duty falling on the local planning authority through the Development Management Procedure Order 2015. Officially safeguarded aerodromes, military aerodromes, defence technical sites and explosives storage areas are all covered. Everything else relies on non statutory safeguarding, where the operator asks the council to consult voluntarily and local plan policy carries the weight instead.
That distinction matters when you are scoping a site. A small unlicensed airfield next door may generate objections, but it will not generate a statutory consultation.
Finding the map and the zone the site sits in
Ask the local planning authority's planning policy or validation team for the deposited safeguarding map. Most authorities hold it as a paper or PDF deposit rather than a live GIS layer, which is why it rarely appears in an off the shelf constraints search.
Read three things off it.
- The height contour your site falls within, and the datum used. Contours are usually expressed as a height above ordnance datum or above aerodrome elevation, and the two are not interchangeable.
- Whether the site falls inside the bird strike consultation area, typically drawn at 13 kilometres from an officially safeguarded aerodrome.
- Whether any technical site zone crosses the site, covering radar heads, instrument landing systems and radio navigation aids.
Then check separately for Ministry of Defence safeguarding, which is administered by the Defence Infrastructure Organisation and uses its own zones. A site can sit outside every civil zone and still be inside a defence technical safeguarding area.
The discipline here is the same as any other pre application data gathering, and it belongs in the same pass as your work on the definitive map for public rights of way and on whether the strategic road network is engaged.
Height, cranes and the consultation trigger
Height triggers are read from the contours, and they differ between aerodromes. Do not assume a single national figure. Close to the runway the trigger can be low enough that a two storey building engages it, while several kilometres out it may sit above anything you are likely to build.
Two heights are in play and applicants regularly confuse them.
| Measure | What it covers | Where it is assessed |
|---|---|---|
| Permanent structure height | The finished building, plant enclosures, lift overruns, masts and lightning protection | Planning application, against the safeguarding map contour |
| Temporary construction height | Tower cranes, piling rigs, scaffold and hoists at full extension | Outside planning, through direct notification to the aerodrome operator |
Cranes are the one that bites. A tower crane on a mid rise scheme reaches far above the finished building, and the aerodrome operator will want notice, position, maximum jib height and often aviation warning lighting before it goes up. The Air Navigation Order 2016 governs obstacle lighting, and the Civil Aviation Authority publishes the guidance operators follow. Build the notification into the construction programme rather than discovering it in the week the crane arrives.
A council will sometimes condition a crane management plan on a consented scheme near an aerodrome. That is a reasonable condition and easier to accept at decision stage than to argue about later.
Bird strike and the land uses that attract birds
Bird strike safeguarding catches land uses, not heights. The consultation is triggered by proposals that create or enlarge attractants within the safeguarding area, and the usual list runs to waste transfer and landfill, sewage treatment, open water and balancing ponds, reed beds, wetland habitat creation, nature reserves, landscape planting that produces berries, and buildings with flat roofs that gulls will roost on.
This is where biodiversity net gain and safeguarding pull against each other. A wetland or species rich grassland proposal that scores well on the statutory metric may be exactly what the aerodrome objects to. The resolution is usually habitat design rather than habitat removal: steeper bank profiles, bird deterrent netting on attenuation basins, planting palettes chosen against berry bearing species, and a bird hazard management plan secured by condition.
Start that conversation early. If your ecologist and your drainage engineer design a large open attenuation basin before anyone checks the safeguarding map, the redesign is expensive. Reading the underlying habitat data properly, as covered in our note on habitat inventories and classification data, helps you see what the aerodrome will see.
Radar, turbines and technical sites
Wind turbines are the classic radar problem. A rotating blade returns a moving signal that primary radar can read as an aircraft, and the resulting clutter can be enough to sustain an objection from the aerodrome operator, from the Ministry of Defence or from NATS on the en route network.
Solar arrays raise a different question. The issue there is glint and glare towards the control tower and towards approach paths, assessed through a modelling study rather than a height check. Tall buildings with extensive glazed or metallic cladding near an approach can attract the same request.
Mitigation exists for all of these. Radar infill, blanking, transponder based solutions and specified panel coatings are all used. None of them is quick, so a turbine or large array within a safeguarding area needs the consultee engaged at feasibility stage.
How the consultation runs
Once validated, the council sends the application to the safeguarding authority. The consultee can agree, agree subject to conditions, or object. An objection from an officially safeguarded aerodrome is not an automatic refusal, but the council has to give it real weight and will rarely approve over the top of one without a very clear reason.
There is a further step people forget. Where a safeguarding authority objects and the council is minded to approve anyway, the matter can be referred to the Secretary of State, who may direct that the application is not determined while it is considered. That adds months. Avoiding it is worth more than any argument you might win.
Keep the correspondence. A written clearance from the aerodrome operator, attached to the application, removes most of the uncertainty from the council's side.
Evidence to put in the application
Put the safeguarding position in the submission rather than waiting to be asked. For a scheme inside a safeguarding zone that usually means a short technical note covering the aerodrome identified, the zone and contour engaged, the maximum height of the proposal against that contour with the datum stated, the construction plant assumptions, and any bird hazard or glint and glare assessment.
Where the scheme is large enough to need formal environmental assessment, safeguarding sits inside the wider process rather than beside it, and an Environmental Impact Assessment scoping request is the right place to agree how it will be covered. An Environmental Statement must be prepared by competent experts under the Town and Country Planning (Environmental Impact Assessment) Regulations 2017, so treat a draft as a starting point for that team rather than a substitute for it. Where lighting is the issue, a Lighting Assessment covers the external lighting design that the aerodrome will want to see alongside any obstacle lighting.
And give the case officer the map reference. Officers dealing with a site near an aerodrome for the first time will often not know which zone applies, and an applicant who has already identified it moves faster than one who has not.
Enter your postcode on PlanScope to see which reports your site is likely to need.
This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Where do I get an aerodrome safeguarding map?
From the local planning authority, which holds the deposited map for any officially safeguarded aerodrome affecting its area. Most councils keep it as a PDF or paper deposit rather than a live mapping layer, so ask the planning policy or validation team directly. Commercial constraints searches often miss it entirely.
How far from an airport does bird strike safeguarding reach?
The bird strike consultation area around an officially safeguarded aerodrome is commonly drawn at 13 kilometres, though the deposited map is what governs. Within it, proposals that create attractants such as open water, waste facilities, wetland habitat or berry bearing planting trigger consultation with the aerodrome operator.
Do I need planning permission for a tower crane near an aerodrome?
A crane is temporary construction plant rather than development, so it is not usually a planning matter in its own right. The aerodrome operator still needs notification of the position, maximum jib height and duration, and may require aviation warning lighting. Councils sometimes condition a crane management plan on schemes inside a safeguarding zone.
Can a council approve an application the aerodrome has objected to?
Yes, but not easily. The council must give real weight to a safeguarding objection, and where it is minded to approve over one the matter can be referred to the Secretary of State, who may direct that the application is not determined while it is considered. That adds months to the programme.
Does biodiversity net gain conflict with aerodrome safeguarding?
It can. Wetland creation, open attenuation basins and species rich planting all score well on the statutory metric and all attract birds. The usual resolution is habitat design rather than habitat loss, using steeper bank profiles, deterrent netting, planting palettes chosen against berry bearing species and a bird hazard management plan secured by condition.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.