Rolled turf or sow yourself??

I made a sketch of our house and garden

We want to enlarge the terrace later and want to build a terrace roof later on

The terrace roof should be 4x5 in size, possibly also 4x6 (our house is 6m wide)

We want to enlarge the terrace so that we have both shade and sun on the terrace.

The table, chairs, and sun loungers should stay permanently on the terrace (sun lounger possibly only temporarily on the lawn)

We want to extend the terrace in depth then (if we extend the terrace to the right, the terrace roof would cast a shadow (that’s my first thought)

We don’t know the exact terrace size yet, it’s hard to imagine because we want to do this only afterwards anyway, so we want to look at it live in the garden to see how much we need

@ that’s why my question was if an automatic irrigation system with drinking water is even worth it or if it’s just a waste and you should rather water by hand with the hose (we will hang a 25-30m long hose reel on the wall)

sunk a gigantic cistern and manages without drinking water.
Check out his thread. Worth reading and watching

For rick, there actually should be a disclaimer for forum newcomers: "This is indeed the best and most beautiful of all solutions, but for ordinary mortals rather unaffordable." :)

The advantage of non-automatic irrigation and a non-automatically mowed lawn is that you become more aware of what you actually have there. A water guzzler that requires care. In my opinion, this has little to do with nature if you waste technology and devices in the garden that are all resource-consuming to produce and ultimately become hazardous waste in ten to fifteen years. To achieve a 150 sqm area that you can also keep green and walkable or playable with less effort. Our lawn: lots of clover, tough grass, violets and anemones in spring, always green, even during longer dry periods. It might be watered once in August with the sprinkler, mowed every 2-3 weeks depending on the weather. The children walk barefoot at their own risk; when the clover blooms, sandals are worn.

What you need depends on what you want.
A lawn like with a robot and automatic irrigation or a lawn like the one described by - that needs no irrigation and no robot. No idea how often the watering system goes on at Rick's place, with just waving the garden hose over it once every few days, it won't do.

The 3 m deep terrace is a bit small for a seating area. You can't fit deck chairs on it. Try drawing everything in. Be careful with a roof covering that you don’t block too much light inside.

Check your development plan to see if it contains a list of plants and other requirements for the outdoor area.

of course the house that built is on another level. But it’s worth reading, as it’s well thought-out. I like his way of tackling the project and how he presented it.

The most economical method of watering is in the early morning hours. The soil is cold and evaporation is still low. It is also beneficial for lawn health because the grass does not stay wet for long, reducing the occurrence of fungal or mold infestations.
A quick spray with the hose is not sufficient. Even with small lawns, it takes time, and hardly anyone does it early in the morning anyway.
For this floor plan, you need a few more sprinklers. You could also omit the irrigation timer and switch manually, turning the faucet on and off. But again, early in the morning.
This lawn area is easy to water. Material costs about €500 and you’re done. How often you want and are allowed to use it is another matter. For a new installation, you simply lay the lines on the rough grading. It’s very simple and quick.
However, I would still talk to the builder to see if a cistern would be possible. You save fees for stormwater and have some water for watering. At the same time, the sewer is relieved during heavy rain...

3x5 m is the standard terrace

The terrace roof should be 4x5-6m (with frosted glass)
The new terrace will probably be 6-7x5-6m

i.e. roof over the entire width and 4m in depth

The new terrace should then be 5 or 6m wide and 6 or 7m deep

i.e. 4m deep are covered and 2-3m are not covered from the terrace

I hope I have expressed myself clearly.

A cistern is unfortunately not possible for us
all plots (it is a large development area) will, however, get a soakaway

nothing is specified in the development plan except rock gardens are prohibited (we didn’t want that anyway)

Presumably, the developer does not want it. If a soakaway works, a cistern works too...