Cost Estimation for Outdoor Facilities with Planning

I hope you can communicate better with the architect than here. It is not primarily about the sums, but about the scope of services and product description and their quantity. I will say this: if someone is willing to spend 100,000 on a garden, they don't need to haggle over 10,000. Your contact person for saving 10,000 euros is the architect.

I am quite confident about the communication with the architect. I won’t go into the polemic about the 100,000... But thanks for the rest of the feedback, I’ll get started on coordinating with the architect.

First of all, a big thank you to everyone for the assessment and comments. That has definitely helped to better understand the topic a little.

I'm quite sure about the communication with the architect. I won't go into detail about the polemic with 100,000...

But thanks for the rest of the feedback, I'll get started on coordinating with the architect

It was not meant polemically. With the project sum and the plot size, there is a lot of potential for pattern variation. 10,000 euros can be easily saved without it being painful. Your planning is in the luxury segment. It's hard to give tips on how to save costs without knowing the calculation basis from soil replacement through the technical details of the various surface connections and transitions to the little bistro table in the breakfast nook. What the plan shows can easily cost 250,000. It is possibly also available for 50,000.
If you want to save quickly - cut the breakfast nook. Let the paving continue on the remaining surfaces and equip the garden with planting containers. These can also be later converted into raised beds.

The budget was 80k, exactly, and now it’s coming in much more expensive, hence my questions here.

Are the 5000€ for the architect included in the 120k€? If the guideline was 80k€ and the "good one" then comes around with a factor of 1.5, I would be upset. Saving half by cutting items won’t work that easily, more likely a complete revision.

Regarding the pool size (6 x 3 is more like a paddling pool if you don't install a counter-current), I would perhaps consider building a hot tub or Jacuzzi instead. Adults get more use out of it all year round.

If you want to save quickly - cut the breakfast nook.

I actually find that particularly cute... says me, a morning grouch :) However, one must consider the eastern neighboring buildings and ensure that the garage wall does not appear too massive (greenery or similar).