Runways, aprons and terminals - the heaviest pavements and the busiest buildings, behind one fence.

The five guides in this sector follow the build order: runway and airside pavement construction, terminal buildings - shopping centres with aeroplanes attached - working airside in a live airport, airfield ground lighting and nav aids, and the hangars and cargo facilities on the support side. The generic corridor civils upstream link through to their canonical guides in the roads and rail sectors.

Airport clients are long-term relationships, not one-off tenders. Heathrow, Gatwick and Manchester run multi-year frameworks where a small club of contractors holds landside, airside civils and terminal lots, and the work flows out as call-off packages on NEC terms. The model exists because airside work punishes newcomers: security clearance for every operative, airside driving permits, escorted movements in live areas, foreign object debris discipline enforced to the point that a dropped bolt stops a shift. Terminal buildings are procured more conventionally - big steel-frame and fit-out packages - but the integration with baggage systems, security lanes and border infrastructure pulls specialists in early. In the Gulf, Dubai Aviation Engineering Projects and the Abu Dhabi airports operator let enormous EPC and design-and-build packages: Al Maktoum International's expansion is among the largest construction programmes on earth, and the region builds airports the way the UK builds motorways, with the state as client, funder and eventual operator.

The commercial signature of airport work is constraint pricing. Every rate carries the weight of night working, security logistics, short work windows and the certainty that the airport's operational needs will outrank your programme at least once a month.

Airside programmes are built from closures. A runway resurfacing at a single-runway airport happens in a night window of six to eight hours between the last arrival and the first departure - plane out, plane in, with the runway inspected, lit and swept before handback. That drives the entire method: pavement quality concrete replaced in discrete bays, asphalt planned in sections that can be completed and cured within the window, and every piece of plant doubled up so a breakdown does not become a cancelled morning of departures. Taxiway and apron work has more flexibility but still orbits the stand plan and the airline schedules. Airfield ground lighting is permanently on the critical path: the pit-and-duct network must precede the pavement above it, the cabling and transformers follow, and the lighting cannot be commissioned until the pavement gives access back.

Landside, terminals programme like the large buildings they are - frame, envelope, MEP first and second fix, fit-out - with two differences that matter. The first is baggage: the handling system is a building-wide machine installed inside the structure, with its own tolerances, commissioning season and a habit of dictating floor levels and slab penetrations. The second is the phased migration into operation: terminals open pier by pier and lounge by lounge, each migration a rehearsed operational trial with staff, bags and volunteer passengers before the first real flight. Heathrow Terminal 5's opening day baggage collapse in 2008 - hundreds of flights cancelled while the system jammed - is the industry's permanent reminder that the last week of commissioning is the programme.

Under the apron sits an infrastructure most passengers never imagine. Fixed electrical ground power and pre-conditioned air at every stand so aircraft can shut down their auxiliary engines; fuel hydrant mains in welded steel with cathodic protection feeding dispenser pits; visual docking guidance systems calibrated stand by stand; and the airfield ground lighting itself - inset centreline and edge lights, approach lighting arrays stretching beyond the fence, all fed on series circuits from constant-current regulators in substations dotted around the airfield. Every one of these systems interfaces with the pavement, which is why the pit-and-duct schedule is agreed before the first concrete bay is poured, and why a forgotten duct crossing discovered at surfacing stage is a career-shortening event.

Navigation aids add another layer with their own custodians: instrument landing systems, radar and meteorological equipment sit in sterilised areas where construction activity is controlled by the air navigation service provider, and a crane jib in the wrong place can force a runway onto reduced operations. The works are coordinated through the airport's operations room with NOTAMs - notices to airmen - issued for every change that touches the published airfield data.

Airside logistics are a discipline in themselves. Materials and plant cross the fence through a single controlled gate with search procedures; deliveries are scheduled against aircraft movements so a concrete wagon never queues on a live taxiway crossing; and every lorry load is swept and inspected before it enters manoeuvring areas. Haul routes are agreed, marked and policed, with escort vehicles where the route crosses anything operational. Working height is controlled across the whole site - cranes carry obstacle lights and are lowered out of hours or when winds pick up - because an obstacle in the approach surface is a hazard to navigation, not a planning technicality. The contractors who thrive airside are the ones who internalise that the airport is not a site with an airport attached; it is an airport that has lent you a corner.

Airport construction failures happen in front of passengers and regulators simultaneously. Beyond T5, the recurring categories are pavement and systems. Runway and taxiway pavements that ravel, rut or crack early close runways, and a closed runway at a capacity-constrained airport is a national news story, not a maintenance ticket - which is why airside pavement specifications are the most conservative in the industry, with dowelled and reinforced pavement quality concrete the default where loads and budgets allow. Airfield ground lighting faults ground aircraft in low visibility, so the series circuits, transformers and control systems carry redundancy and a test regime that would embarrass most building services. Fuel hydrant systems are tested and inspected to petrochemical standards because a leak under a live apron is an evacuation.

The quieter failure is logistical: security or FOD incidents traced to the works. A tool left airside, an operative airside without clearance, a haul route crossing a live taxiway without permission - any of these stops the works and can end a contractor's framework place. The discipline is the deliverable.

Gulf airports operate as 24-hour hubs with banks of departures through the night, which removes the classic UK night window and forces work into rolling stand and taxiway closures negotiated movement by movement. The climate writes the pavement specification: asphalt mixes designed for rutting resistance at sustained heat, concrete placed at night with temperature control, and expansion behaviour on aprons the size of small towns engineered rather than assumed. Standards converge on ICAO with the UK CAA and the UAE GCAA as regulators, so the technical framework is shared - the differences are operational tempo and scale. A Gulf greenfield airport programme builds runways, terminals and people movers simultaneously on an empty site with state-backed urgency; a UK airport scheme threads the same assets through a live operation that was full in 1990.

What transfers completely is the discipline: FOD control, airside licensing, lighting-critical-path logic and rehearsed migration into service are the same disciplines in Dubai as in Stansted, because the aircraft and the consequences are the same everywhere.

Handover airside adds one more gate the buildings world never sees: the regulator and the airport's own safety team must accept the changed airfield before it reopens to aircraft. A resurfaced runway is inspected, friction-tested and swept; the lighting is flight-checked; the markings are measured against the published charts; and the NOTAM that closed the area is cancelled only when the aerodrome certificate holder is satisfied. The pavement may be structurally perfect, but until the paperwork says the runway is back, it is a very expensive car park.