Crane oversailing and land you do not control
Planning permission does not authorise a crane jib to cross a boundary. Here is where oversailing does engage the planning process, what a licence covers, and what to do when one cannot be obtained.
Crane oversailing of land you do not control is a private law problem that becomes a planning problem only through the construction management plan. Swinging a tower crane jib through a neighbour's airspace is trespass, and a neighbour can obtain an injunction to stop it. Planning permission does not cure that. The authority will not refuse an application because an oversail licence has not been agreed, and it will not help you obtain one either.
What the authority can do is condition a construction management plan that assumes the crane, at which point the absence of a licence becomes your programme risk and nobody else's.
Whether oversailing is a planning matter
Mostly not. The rotation of a jib over adjoining land is neither development nor a change of use, so it needs no permission.
Four situations pull it into the planning process anyway.
- Where the crane is within an aerodrome safeguarding zone, or tall enough to be notifiable for aeronautical charting, so the authority consults on safeguarding grounds
- Where a condition requires a construction management plan showing the crane position, radius and working arrangements
- Where the crane's own effects, principally night-time obstruction lighting and noise from operations, are controlled by condition
- Where the scheme could not physically be built without oversailing land in third party ownership, which can bear on whether a permission is capable of being implemented
The last one is worth being honest about internally. A permission for a scheme with no feasible crane position is still a valid permission. It is also a deliverability problem the board should know about before the land is bought.
Rights needed from neighbouring owners
An oversail licence is a private agreement with whoever owns the airspace, which usually means the freeholder and may also involve long leaseholders whose demise includes the airspace.
Case law on this is settled and unhelpful to developers. The courts have held that a tower crane jib passing over land is a trespass, and that the remedy can be an injunction rather than damages. A neighbour therefore holds a position of real strength, and the licence fee reflects it.
Expect a licence to cover the permitted swing arc, the hours of operation, a prohibition on carrying loads over the neighbour's occupied areas, insurance and indemnity requirements, a survey of the neighbour's property before and after, notice arrangements, and a fee with an escalation if the programme overruns.
The Access to Neighbouring Land Act 1992 does not help. It allows a court to order access for works reasonably necessary for the preservation of land, which does not extend to constructing a new building. There is no statutory route to force an oversail.
Out of service, a tower crane must be left free to weathervane through a full circle so it can turn into the wind. That means a crane whose in-service slewing is restricted to the site will still oversail at night and at weekends. A licence that permits only restricted in-service slewing has not solved the problem.
Where the crane appears on the drawings
The crane needs to appear in three places, and in most submissions it appears in none.
- The construction phase plan within the construction management plan, showing the base position, the jib radius, the counter-jib tail swing and the extent of oversail over each adjoining title.
- A sequence drawing showing erection and dismantling, which usually needs a mobile crane, a road closure and more space than the tower crane itself.
- The site logistics plan showing the hoisting zones, the exclusion zones beneath loads and the pedestrian routes that have to be maintained past the site.
Tail swing is the item most often left out. The counter-jib swings through a much shorter radius than the jib, and on a tight urban site it can be the element that oversails an adjoining roof terrace even when the jib is restricted.
Mark each adjoining title separately and note the status of the agreement for each: granted, under negotiation, or not sought. An honest plan showing two of four agreements in place is more useful to a contractor pricing the job than a drawing that shows no crane at all.
Airspace, aerodromes and safeguarding
Height brings a second set of consultees. Aerodromes operate safeguarding zones within which tall structures, including temporary ones, have to be notified so that the effect on approach surfaces, radar and instrument procedures can be assessed. Ministry of Defence safeguarding applies around defence sites.
Separately, structures above a certain height are notifiable for aeronautical charting, and obstruction lighting may be required. The threshold and the procedure sit with the Civil Aviation Authority and the aerodrome, and the notification is normally made by the contractor rather than by the planning applicant, which is exactly why it gets missed.
Check this at planning stage even though the obligation falls later. A condition requiring the crane details to be approved before commencement, on a site inside a safeguarding zone, can hold up a start date by weeks while a consultation runs.
What happens if the licence is refused
Assume it might be, and price the alternatives before they are needed.
A luffing jib crane raises the jib rather than extending it horizontally, so its working radius can be kept inside the site boundary, and its out of service footprint is much smaller than a saddle jib crane. It costs more, lifts less and works slower. That is usually the answer where a neighbour will not agree.
Other options exist. Reposition the crane base, which may mean losing a core position or building the crane into the structure. Use mobile cranes on a lift-by-lift basis, which is slower and needs standing space. Use mast climbing platforms and telehandlers for facade work. Or redesign the structure to reduce the number of heavy lifts, for example by moving from in situ to precast or the other way round depending on the site.
Each of those has a programme cost, and the programme cost is the negotiating position. A developer who knows that the luffing jib alternative costs a defined sum knows what the licence is worth and can stop paying above it.
Where the answer changes the temporary works, the assumptions usually end up secured through temporary works and construction stability conditions, so keep the engineering and the planning documents aligned.
Addressing it in the construction management plan
The plan should say what is proposed, what is agreed and what happens if it is not.
Set out the crane type and position, the in-service and out of service swing arcs with the oversail extent over each adjoining title, the arrangements for erection and dismantling including any highway closure, the hours of operation, the lighting proposed and its controls, and the arrangement for notifying neighbours before lifts near their boundary.
Then state the contingency. A single paragraph confirming that if oversail agreements cannot be obtained the works will proceed with a luffing jib crane on a revised programme is worth having, because it demonstrates the scheme is deliverable and it stops a condition being drafted around a crane you may not be able to use.
Vehicle movements for crane delivery, concrete supply and material handling belong in the construction traffic management plan rather than being duplicated here. Keep the two documents consistent on the road closure dates, because a contradiction between them is the sort of thing a highway officer will find.
To see which construction and management documents a scheme is likely to need, enter the postcode on PlanScope and work from the report list it produces.
This is general guidance, not legal advice. Oversailing rights are a property matter and should be taken to a solicitor. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Does planning permission allow a crane to oversail neighbouring land?
No. Permission authorises development on the application site and says nothing about private rights over adjoining land. Swinging a jib through a neighbour's airspace is a trespass, and the courts have granted injunctions to stop it. A separate oversail licence from the owner of that airspace is needed, and the authority has no role in obtaining it.
Can a neighbour be forced to allow oversailing?
No. The Access to Neighbouring Land Act 1992 allows a court to order access for works reasonably necessary to preserve land, which does not extend to constructing a new building. There is no statutory mechanism to compel an oversail, so the neighbour holds a strong negotiating position and licence fees reflect that.
Why does a restricted swing arc not solve the problem?
Because a tower crane must be left free to weathervane through a full circle when out of service, so it can turn into the wind. A crane whose in-service slewing is limited to the site will still oversail at night and at weekends. Any licence therefore has to address the out of service condition as well as working hours.
What is the alternative if no licence can be agreed?
A luffing jib crane, which raises rather than extends its jib and can keep its working radius inside the site boundary with a much smaller out of service footprint. It costs more, lifts less and works more slowly. Other options are repositioning the base, mobile cranes lift by lift, mast climbing platforms, or redesigning to reduce heavy lifts.
Do cranes need aviation notification?
Cranes within an aerodrome safeguarding zone have to be notified so the effect on approach surfaces, radar and instrument procedures can be assessed, and structures above a certain height are notifiable for aeronautical charting with obstruction lighting sometimes required. The obligation usually falls on the contractor, which is why it is often missed.
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.