The short answer
An oversail licence is the council's permission for part of a crane, or the load it carries, to pass over a public road or pavement. A house extension needs one when the crane stands on private land but swings over the highway. Your contractor applies, not you. Passing over a neighbour's land is separate and needs the neighbour's consent.
On this page
The space above a road belongs to the highway just as the tarmac does. Anything that hangs or swings through it, even for an hour, needs the highway authority’s agreement. For cranes, that agreement is usually called an oversail licence.
Three permissions that get confused
Lifting something large at a house can involve up to three separate permissions from the council, and people use the names loosely.
| Permission | When it applies |
|---|---|
| Crane licence | The crane itself stands on the road or pavement |
| Oversail licence | The crane stands on private land, but its jib or load passes over the highway |
| Temporary road closure | Traffic or pedestrians cannot safely pass while the lift happens |
Some councils issue one combined licence. Others treat each separately, with its own form and fee. A lift from your own drive, where the module arrives on a lorry in the street and is swung across the pavement, would typically need an oversail licence and a short pavement closure. A lift from the road needs a crane licence and usually a road closure.
Who issues it
The highway authority. In most of England that is the county council or the unitary council; in London it is the borough, or Transport for London on red routes. In Scotland and Wales it is the local council, or the national trunk road body for trunk roads.
Councils grant these licences using their powers under the Highways Act 1980. Road closures are made by a temporary traffic order under the Road Traffic Regulation Act 1984.
Who applies
The contractor carrying out the lift, or the crane company on its behalf. Councils want the applicant to be the party that holds the insurance and controls the work. As the homeowner you will not fill in the form, but you should know it exists, because the dates on it control the date of your lift.
What the council asks for
Requirements differ, but most application forms ask for the same things:
- the location, date and hours of the lift
- a drawing showing where the crane stands and the area it sweeps
- the lift plan and method statement
- a traffic and pedestrian management plan, with barriers, signs and marshals
- proof of public liability insurance, commonly for at least £5 million
- the names and qualifications of the appointed person and crane supervisor
Fees are set by each council and published on its highways licences page. They vary a great deal, so no national figure is worth quoting. Some councils also take a refundable deposit against damage to kerbs and paving.
How long it takes
For a licence alone, councils commonly ask for one to four weeks of notice. A road closure takes much longer, because a traffic order has to be advertised: several weeks is normal and some councils ask for three months.
This is the item that most often delays crane day. The factory can finish the room on time and the base can be ready, yet nothing moves until the council’s date arrives. A firm that builds modular house extensions regularly will apply as soon as the delivery week is fixed, and will know which councils are slow.
Oversailing a neighbour
A council licence covers the highway only. If the jib or the load passes over a neighbour’s garden or roof, you need the neighbour’s permission. Property rights extend upwards, and the courts have treated a crane swinging over someone’s land without consent as trespass, even where no damage is done.
For a one-day lift, written agreement by letter or email is normally enough. It should say what will pass over, on which day and between which hours, confirm that the contractor’s insurance covers any damage, and promise that nobody will be asked to stay indoors beneath a suspended load. On larger projects with a tower crane in place for months, neighbours often ask for a formal oversail agreement and a payment. That is rare for a single extension.
Ask early and in person. A neighbour who first hears about the lift from a crane arriving outside has every reason to object, and an objection on the morning can cancel the day.
What if you lift without one?
Working over the highway without a licence is an offence, and the council can stop the work on the spot. The contractor’s insurance may also be void for an unlicensed operation, which leaves any damage or injury uncovered. No reputable crane company will set up without the paperwork in the cab.
What it means for your project
You have three practical jobs.
Ask what is needed. After the site survey, the firm should be able to tell you whether your lift needs a crane licence, an oversail licence, a closure, or none of them. A crane standing on your own drive and lifting over your own land needs no highway licence at all.
Ask what it costs and who pays. Council fees and traffic management are sometimes left out of quotes as “by client” or as a provisional sum. Get them included or itemised.
Protect the date. Find out the council’s notice period and count back from the delivery week. If your street has a school, a bus route or permit parking, tell the firm, because councils often restrict the hours for those.
Our page on delivery and cranes explains how the crane position is chosen, and the post on contract lifts and crane hire covers who plans the lift. When you are ready, get a quote and mention anything unusual about the street.