Lawn size

[PlantDoctor]

We're overhauling our garden. It's about 30 m long by about 7 m wide, not including bin store space outside back door. We are planning to have a lawn for the first part, then a paved seating area in the middle, then veg patch and shed/greenhouse at the bottom.

Next door have a building starting from about 11m down the garden, so DH wants to align the seating area with that to make a little enclosed space that makes sense. I am concerned that the grass area is smaller than I had originally thought (I was thinking more like 15m of lawn), because I'm hoping DD4 can finally have space to play and run in.

While I am very aware that some people have smaller or no lawns (that's us currently!), I don't want to mess up this decision. For clarity, all 3 of us are quite keen to grow food and flowers in the veg part, and we did think we could potentially lose a bit of it to a trampoline if DD so wishes! What do you all think? Should I push for a longer lawn, or is 11m sufficient?

We have:
10m of play space. Trampoline and playhouse.
10m of grass which includes table and chairs and washing line.
5 m of veg space including greenhouse.

Where the sun is decides where some things are, plus ease of access. Greenhouse and laundry down the back in sun and away from balls, table and chairs in sun but closer to the house (can be moved for grass games). Trampoline is in shade but close to the house for ease on in / out and that is the play space, it is tucked out of sight a bit.

So where is the shade in your garden? Bear in mind that a trampoline will kill the grass under it unless you constantly move it.
Also you have a fairly narrow garden so ball games will end up with balls going over. Use of climbing plants and small trees can help contain the garden and give colour without loosing too much width.

If we had sun outside the back door I'd have the seating area there for easy access from the kichen.

Thanks for your reply, @Rollercoaster1920! It's an almost perfect north-south line so we don't get much sun at all directly next to the house. We were thinking of narrow flower beds and perhaps espaliered trees alone the lawn fence so that fits nicely with your suggestions, but I hadn't considered constant ball retrieval, thanks!

How do you find your lawn size? I'm dreaming of things like water pistol fights and mini ball games (although like you say we'd have to be careful not to lose them!)

Slip and slides have been great! Also the sprinkler in the summer.
Water pistol fights tend to use cover so the open space is danger. To be honest the sprinkler was easy more fun than water pistols.
You have more width than me so ball games might be more contained. Perhaps look at pleached trees to give a higher ball containment. We have a 10 foot trampoline. You could get a 12 foot one which has more play space.

It's avoid flower beds, get climbers and shrubs that are tolerant to balls and easy to mow up to / under.

Do you have a dog or are you planning a dog? Have a look here https://www.abc.net.au/gardening/how-to/a-dogs-garden/9431012.

I can vouch for the dog patrolling the boundary, sometimes at very high speed!

Thanks @Rollercoaster1920 , sprinklers do sound fun! Or just a decent paddling pool.

Thanks also @TheSandgroper, that's a good point about the dog. We have an elderly greyhound who doesn't really run. These days but he's one of my factors for sure. He doesn't mind running in small loops but definitely churns the lawn up when he does! He or future dogs was one of the reasons I was thinking we'd need more lawn, although I think I forgot to mention in my OP!

Dig your trampoline into the ground and buy a green one so it blends in. Looks much better, is safer and that way you can still kick a ball over it, run over it, etc, and when the trampoline is no longer needed, you could convert the hole into a wildlife pond.