Using aerodrome safeguarding maps

Aerodrome safeguarding maps are deposited with the local planning authority by the aerodrome operator, and the authority must consult the operator where a proposal falls inside a safeguarded area and crosses one of the triggers marked on the map. Ask the planning department for the deposited map early. Checking it after the layout is fixed is how a scheme ends up with an attenuation basin 400 metres off a runway threshold and a holding objection from the operator.

The triggers go well beyond tall buildings. Height, external lighting, reflective surfaces, radar interference and anything likely to attract birds all engage safeguarding, and the bird hazard zone usually extends far beyond the physical obstacle-limitation surfaces.

Where safeguarding maps are held

Officially safeguarded civil aerodromes, military aerodromes, technical sites and explosives storage areas are covered by a safeguarding direction, with the government circular on safeguarding setting out the arrangements. The operator prepares the map, the authority holds it, and the consultation duty follows from the direction rather than from the operator's preference.

Three practical routes to the map. Ask the local planning authority's planning policy or validation team for the deposited safeguarding map covering your site. Ask the aerodrome operator's safeguarding team directly, which is usually faster and gets you the technical contact you will need anyway. For Ministry of Defence sites, the Defence Infrastructure Organisation handles safeguarding enquiries.

Not every airfield is officially safeguarded. Licensed aerodromes without a direction often ask authorities to consult them informally, and many local plans carry a policy requiring it. A site near a small unlicensed strip may have no formal safeguarding at all and still attract an objection about aircraft operations, which is a material consideration in the ordinary way.

Record what you asked for, who you asked, and the date. Where the authority cannot locate a map, that correspondence protects you later.

Height, lighting and bird hazard triggers

The deposited map divides the surrounding area into zones, each with its own trigger, and the figures are stated on the map itself rather than being standard across the country.

Height triggers work from the obstacle-limitation surfaces around the runways and the instrument approach procedures. A zone close to a runway end may require consultation on anything above a low figure, while an outer zone sets a much higher one. Measure proposed structures to the highest point including plant, lift overruns, masts, flues and lightning protection, and express it as a height above ordnance datum rather than above local ground level, because that is the datum the operator works in.

Bird hazard zones are the trigger developers miss. Development likely to attract birds, such as landfill, waste transfer, food processing, large areas of open water or extensive new grassland, is controlled over a wide radius, commonly measured in kilometres rather than metres, with the precise extent shown on the map. The concern is the flight line between a feeding area and a roost crossing an approach path.

Lighting triggers cover installations that could be confused with aeronautical ground lighting or that produce upward spill into a pilot's field of view. Floodlit sports pitches, large car parks and illuminated signage all qualify.

Consultation with the aerodrome operator

Treat the operator as a technical consultee to be engaged before submission, not a box the council ticks afterwards.

Send a short pre-submission package: a site location plan with coordinates, the proposed maximum height above ordnance datum with a cross-section, the external lighting layout with luminaire types and upward light ratios, details of any reflective cladding or photovoltaic array, and a note on any water body or habitat creation. Ask the safeguarding team to confirm whether they object, and on what conditions they would not.

The operator's response will usually come as no objection, no objection subject to conditions, or an objection with the technical reason stated. An objection on radar or on an obstacle-limitation surface is rarely negotiable by argument alone and needs a design change. An objection on bird hazard is often resolvable through the design of the water features and the management regime.

Where a scheme must proceed against an objection, the authority can grant permission but will want a clear justification, and a refusal on aviation safety grounds is hard to overturn at appeal because the inspector will defer to the technical evidence.

Cranes and construction operations

The permanent building is often shorter than the tower crane that builds it, and crane operations are a separate notification exercise entirely.

Civil Aviation Authority guidance for crane operators sets out notification and lighting expectations for cranes near aerodromes and in the vicinity of flight paths. The obligation sits with the crane operator and the contractor, but the planning submission should acknowledge it, because an authority that has consulted the aerodrome will want to see that the construction phase has been thought about. Put the anticipated maximum crane height, including the jib at its highest operating position, in the construction management information.

Where a condition requires a construction phase aviation notification, it is normally discharged by submitting the crane operator's notification and the aerodrome's acknowledgement. Build that into the programme, since it is one of those conditions that is easy to overlook until a crane is booked.

Solar glare and radar considerations

Ground-mounted photovoltaic arrays near an aerodrome need a glint and glare assessment, which models the sun's position through the year against the array geometry and tests whether reflections reach the air traffic control tower or an aircraft on final approach. The output is a set of findings by receptor and time of year, with mitigation through tilt angle, row orientation, screening or an anti-reflective coating.

Radar interference is a separate question and applies to tall structures, wind turbines and sometimes to large metal-clad buildings in a line of sight. The operator's own technical assessment governs, and there is no public dataset that answers it, so this is one of the few points where you cannot do the work yourself in advance.

Where a scheme includes surface water attenuation, the drainage design and the safeguarding position have to be settled together. Open balancing ponds attract gulls and waterfowl, so the flood risk assessment and the drainage strategy may need to favour below-ground storage, steep-sided and planted margins, or netting. Agree that approach with both the lead local flood authority and the aerodrome before fixing the layout.

Conditions on height and lighting

Expect conditions, and expect them to be worded tightly.

Common forms are a maximum height above ordnance datum for the building and for any later plant or antenna, approval of an external lighting scheme with upward light ratio limits before installation, approval of a bird hazard management plan covering the construction and operational phases, restrictions on landscape species that produce fruit or seed attractive to birds, and notification requirements for cranes and scaffolding above a stated height.

A bird hazard management plan is a working document. It needs a named responsible person, inspection frequency, trigger-based control measures, and a reporting line to the aerodrome. A plan that is a page of intentions will be sent back.

Evidence for the application

Put the safeguarding position in the planning statement rather than leaving it to be inferred from the drawings.

State whether the site falls within a safeguarded area and cite the deposited map by its reference and date. Give the maximum proposed height above ordnance datum and the zone trigger it was tested against. Confirm the pre-submission consultation with the operator and attach the response. Summarise the glint and glare findings where relevant, and the bird hazard approach where water or habitat is proposed. Where aviation is not engaged at all, say that too, with the reason, because a one-line confirmation saves a consultation cycle.

Checking the physical evidence of the site alongside the maps helps. Historic and current imagery shows existing tall structures, which tells you what has already been accepted nearby, and our note on reading aerial photography as planning evidence covers how far to rely on it. Measuring the site and the structure heights consistently matters just as much, and the conventions are set out in measuring site area and floorspace for a threshold test. If external lighting is part of the scheme, the same layout work feeds the noise and light assessments, and checking strategic noise maps before you fix a layout explains why these checks belong together at concept stage.

Enter your postcode on PlanScope to see which reports a site near an aerodrome is likely to need.

This is general guidance, not legal advice. Safeguarding maps, zone triggers and consultation arrangements vary by aerodrome, so check the deposited map and 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.