Want the boundary itself to be the challenge?
Keep the ball in the garden turns the fence and hedge line into the point.
Read the boundary gameA full-size goal in a small garden is a bit of a joke, really. It barely fits, and hitting a target that big stops feeling like an achievement fast.
If your garden's too small for a proper goal, stop trying to fit one in. Use the corners you've already got, fence-meets-shed, patio-meets-flowerbed, as targets instead. Pick a corner, aim gently, score more for the harder ones, and it needs no equipment beyond a cone or a stone to mark each spot. Below: a simple starter version, three ways to make it harder without more space, and a scoring option for kids who like counting.

Free targets you already own
We didn't set out to invent a shooting game, we just ran out of room for a normal one. A small garden usually has at least two or three natural corners already, where the fence meets the shed, where the patio meets a flowerbed, wherever. Using these as targets means you're not setting anything up in the middle of your limited space, which stays free for actually playing.
It also means every target is a slightly different size and angle, so the challenge varies without you doing anything except choosing which corner to aim at. That matters more than it sounds: the average UK garden is now around 244 square metres, smaller than most people picture and shrinking further in dense urban areas, London gardens especially, so plenty of readers are working with an oddly shaped or tighter-than-expected space rather than a generous open lawn.
Start here, tonight
Pick two or three corners and mark each roughly with a cone, a stone, whatever's to hand. Take it in turns choosing a corner and trying to land the ball in it, gently, this is about accuracy, not power. Missing just means collecting the ball and going again toward whichever corner's now easiest to reach.
Three ways to raise the bar
Once landing the ball in a corner feels easy, narrow what actually counts: only the last foot or so of each corner rather than the general area, so "only the corner post itself counts now" becomes the rule. Or start further back, even half a stride further makes a real difference in a small garden. Or introduce a "call your corner before you shoot" rule, naming the target out loud before striking, which adds a bit of decision-making pressure without needing any extra room, and works especially well as its own short round once the basic version feels too easy.

For the kids who count everything
Give each corner a different point value based on how tricky it is, the awkward one behind the bin gets three points, the easy open one gets one. Add the points together as a shared total rather than counting wins and losses. It gives shape to the game without turning corners into a competition against each other.
The evidence behind varying it up
A study on varying the target children practise aiming at found that children who practised a throwing skill at varied targets, rather than repeatedly at one fixed target, tended to retain and transfer the skill better than children drilled on a single, constant target.
This is a 1978 supervised PE beanbag-throwing study with school-aged children, not informal garden football, so it supports the general principle only, not a specific accuracy claim for 5 to 9 year olds playing informally. It's a useful thing to know regardless, because corners already vary by nature, so a reader gets this "for free" just by using the space they already have instead of a single bought target.
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Scripts that keep it fun
"Which corner are you feeling?" works well as an opener, it hands the choice over and makes the whole thing feel more like a game than a drill. After a miss, "so close, go again" beats any comment about technique, particularly in a small space where a miss might mean retrieving the ball from somewhere slightly awkward too.
Which small-space game fits tonight
Where keep the ball in the garden is about the edges of the whole space, this one's about specific spots within it, which makes it the better choice once your child's past just enjoying being outside and wants something to actually aim at. If corners aren't really a feature of your outdoor space, a driveway with a garage door at one end, say, driveway football game ideas has a version built for that instead.
Keep the ball in the garden turns the fence and hedge line into the point.
Read the boundary gameDriveway football game ideas is built for a flat, hard surface instead.
Read the driveway game ideasSmall Garden Games sorts every game in this cluster by what your space has.
Visit Small Garden GamesQuick answers
Use the corners you already have, where the fence meets the shed or the patio meets a flowerbed, and mark them with a cone or a stone. It needs no extra equipment and no floor space beyond the corner itself.
Shrink what counts as a hit down to the last foot of the corner, add half a stride of extra distance, or add a "call your corner before you shoot" rule so the choice has to be made in advance.
Mini target goals in the UK start from around £19 to £25, so they're not expensive, but using the garden's own corners costs nothing and gives more natural variety in target size and angle than a single bought target does.
Tonight's five minutes
Pick two corners, hand your child the choice of which one to aim at, and see how many rounds you get through before tea's ready.