Does the ball keep escaping anyway?
A touch-counting boundary game that turns the fence line into the challenge.
See the boundary gameEvery ball over the fence costs you a knock on the door. If your football keeps going over the fence into the neighbours' garden, turn the shooting line, add a cheap barrier on your side and agree one polite way to ask.
Work through four fixes in order: turn the shooting line so misses run down your own lawn, pick a calmer ball, hang a cheap barrier on your side and only then think about a taller fence. When the ball still escapes, an adult knocks and asks, and nobody goes in without being invited. A council says a child who kicks a ball into a property should knock on the door (North Tyneside Council's advice on children playing). This page departs from that on one point: an adult goes, because a grown-up asking makes it easier for both sides. None of these fixes has been tested, so treat them as a sensible order, not a promise.
For a long time I sent my child round to knock, and the knocking wore next door's patience thinner than the kicking ever did. Then I turned the goal so misses ran down our own lawn. The knocks dropped from several a session to the odd one.

Look before you buy
The ball almost always leaves from the same place in the same direction, so a minute of watching tells you more than a shopping trip. The table is my reading of what parents describe in a parents' thread on football in the garden and a neighbours' thread on footballs over the fence, and none of it has been tested.
| What you see | What it may be | First thing to try |
|---|---|---|
| Most escapes come from shots at one end | The goal or target faces the fence. | Step 1: turn the shooting line down the lawn. |
| The ball leaves from play right at the boundary | Nothing marks where the game stops. | Step 1: a back line a few adult strides in from the fence. |
| Short, hard kicks bounce up and over | A lively ball and a hard surface. | Step 2: a softer, calmer ball. |
| It goes over in one spot only | A low panel, a gap or a lean in the fence. | Step 3: a barrier on your side of that stretch. |
Watch three ordinary games and make a note of where the ball leaves from. Fix the one stretch that does most of the work first.
If you would rather turn the boundary into a game, there is a touch-counting boundary game for a small garden.
Cheapest fix first

Climb only as far as you need. Parents describe nets, moving the goal and a calmer ball in the same two threads, and a local news piece suggests mesh netting (a local news piece on a neighbour keeping a ball).
No source tests any of them, so this is an order of effort and cost, not a proven method. Everything stays on your own side of the boundary.
Shooting line. Point the goal or target down the longest stretch of lawn, so a miss runs away from the fence. Rope or cones can mark a back line a few adult strides in from the fence, and the fence side is out of play.
Calmer ball. Use a lighter, softer or slightly less pumped ball near the fence. It carries less and bounces lower. Save the lively ball for the park.
Barrier on your side. Run garden netting from tall poles or canes set well inside your garden, behind the goal, and peg the bottom edge. Do not fix it to the neighbour's fence or hang it from a hedge. Cap every cane or stake end so nobody falls on it.
Fence height, last. In England a fence can be up to two metres without planning permission, or one metre next to a road, but a boundary may be shared or have its own conditions (the Planning Portal's fence height rules). Talk to next door before you raise anything.
Move up a step only when the one before has failed.
That fence height is England's rule. Wales may differ and Scotland and Northern Ireland have their own, so check with your council. It is a planning rule, not an answer to who owns the fence.
If a bigger or smaller goal would change where misses go, the goal size page helps you choose. If the line beyond the goal ends at a car or glass, the danger-zone map in protecting the car and windows from football does that job.
Ask, wait, say thanks

One council says a child who kicks a ball into a property "should knock on the door", and the householder should hand it back or allow it to be collected (North Tyneside Council). The ask-first rule here rests on that advice to knock; I did not find an authoritative page on the law for a stray ball, so this is not legal advice.
That is general advice, not legal advice, and local rules differ. This page departs from the council on one point: an adult goes to the door, because a grown-up asking makes it easier for both sides, and your child waits a step behind.
"Hi, our ball has come over again. Is it all right if I get it, or could you pass it back?" An adult knocks, with your child standing a step behind.
Leave it for later. Do not climb, reach over or send a child in. Try again after tea or leave a short note.
"Thanks, that's very kind. We've put a net up to cut down the knocking." Say it every time, and mean it.
"Shall we agree I knock once an evening, so you are not answering all day?"
I used to knock every time and stopped noticing how it sounded from the other side. A once-a-day knock suited everyone, and one forum neighbour describes the same idea (a neighbours' thread on footballs over the fence).
If the ball lands near a pond, a dog, a greenhouse or a roof, leave it and ask the neighbour to hand it over.
If it does not stop
If it still happens often, talk before a grumble becomes a row. GOV.UK says to try to discuss the problem with the neighbour first and, if that is hard, to write a letter that sticks to the facts (GOV.UK's advice on talking to your neighbour). A note that offers a netting fix, a stop time and thanks tends to land better than silence.
That advice is written for the person with the complaint and does not mention balls.
Offer to repair any damage. North Tyneside Council says withholding balls "can lead to neighbour disputes" (North Tyneside Council's advice on children playing), so say that kindly if a ball is kept. If it stays awkward, a quieter place to play is a fair choice, with a park nearby.
If next door has already complained about noise, the calm reply is on the neighbour complaining about football noise page. No source found tests when a neighbour's patience runs out, so this is a reading of the advice, not a finding.
What is known and what is not
GOV.UK says to try talking to the neighbour first and to write a factual letter if that is hard (GOV.UK's advice on talking to your neighbour). It is general advice for neighbour disputes, written for the person with the complaint, and it does not mention balls.
North Tyneside Council says a child who kicks a ball into a property should knock and the householder should hand it back or allow it to be collected. It also says withholding balls can lead to neighbour disputes (North Tyneside Council's advice on children playing). That is one council's advice, not law, and other councils and nations may differ.
The Planning Portal gives two metres for most fences in England and one metre next to a highway (the Planning Portal's fence height rules). It covers England only as written, and it is a planning rule, not a rule about who owns a fence or what a neighbour will accept.
The ask-first rule rests on the council's advice to knock. I did not find an authoritative source on the law for a stray ball, so treat it as general advice, and local rules differ.
Parents' forum threads describe netting on their own posts and returning balls once a day (a parents' thread, a neighbours' thread). These are anecdotes and nothing was tested.
No source found tests a net, a ball or a script for this, so the page offers a sensible order, not a proven fix. It is not legal advice.
Quick answers
Work through four fixes in order: turn the shooting line down the lawn, use a calmer ball, hang netting on your own side, and only then think about a taller fence. None has been tested.
Ask first. Council advice is to knock. I found no authoritative source on the law here, so this is general advice, not legal advice, and local rules differ.
An adult, with your child a step behind. A council says a child who kicks a ball in should knock, but a grown-up makes it easier for both sides.
Leave it, and ask again later. Never climb, reach over or send a child through a gap.
In England a fence can be up to two metres without planning permission, or one metre next to a road. Talk to the neighbour first, and check the rules for Wales, Scotland and Northern Ireland.
Ask kindly, and offer a fix such as a net. A council says withholding balls can lead to disputes, and GOV.UK suggests talking first, then a factual letter.
Keep going
Three places to go next, depending on what happened after the knock.
A touch-counting boundary game that turns the fence line into the challenge.
See the boundary gameA calm reply, a quiet-hours plan and where you stand on the noise.
See the calm replyGames and fixes for a lawn, a patio or a tiny garden.
See Small Garden GamesTonight's five minutes
Stand where your child shoots and look through the goal. If a miss would clear the fence, turn the goal down the lawn and mark a back line a few strides in. Do it before the next game.