Garden house - Should a structural engineer be hired for the foundation?

Hello,

Does anyone have experience with building a garden shed and what needs to be considered?

My parents plan to set up a prefabricated wooden house of about 25-30m² on a garden plot in Saxony. Electricity and water will be provided from the neighboring property as before. Both should also be laid into the house. Wastewater should certainly infiltrate as it does now. The plot is intended to be used as a weekend property. What I don’t know is how the toilet issue should be handled in the future.

Currently, there is a small garden shed of about 12m² on the property. This is to be removed and replaced by the new house. The existing shed stands directly on the property boundary next to a path for which there is also a right of shared use. From when must the 3m distance from the property boundary be observed here?

According to the city’s website, small structures up to 10m² are exempt from approval. Accordingly, a building application would have to be submitted, right? Does the application have to be signed by an architect/civil engineer?

According to the house manufacturer, a strip or pad foundation must be laid under the house. Must a structural engineer be commissioned additionally, or is this included for prefabricated houses?

What else must be considered?

A clearance area of 3 meters must be observed. You do not need any special permission. So it's not a big deal.

You don’t need a special permit.

Is that your opinion or do you have background information on where that is stated.

I found this in the Saxon Building Code:

§ 63a Exemptions from permit requirements
(1) No building permit is required for the construction and modification of the following structural facilities, other installations, and equipment:
1. Buildings
a) Buildings without habitable rooms, toilets, and fireplaces, if the buildings do not exceed 15 m³ gross volume, in the outer area do not exceed 6 m³ gross volume and are neither used for sales nor exhibition purposes,
...
f) Weekend houses on weekend sites up to 40 m² built-up area and 3.50 m ridge height,
g) Garden arbors in permanent small garden areas according to the Federal Small Garden Act (BKleingG) of February 28, 1983 (Federal Law Gazette 1 p. 210), last amended by Article 9 of the Act of August 18, 1997 (Federal Law Gazette 1 pp. 2081, 2111), in the respectively applicable version,

The building exceeds 15m³
It is not a small garden area,
and I lack the definition of a weekend site. But I imagine that rather as a plot of land by the lake.

Is that your opinion or are there also background infos about where that is stated?

As long as he doesn't have a stickler for paragraphs among his neighbors, he doesn't need to worry. A query with his neighbors will settle it.

As long as he doesn't have a nitpicker among his neighbors, he doesn't need to worry. A simple inquiry with his neighbors will settle it.

Well, that's a well-founded statement!
Can Musketier then refer to you in a serious case?

I'll do it;)?

I talked to my parents again. The garden house should be placed in the middle of the property anyway. Boundary distances are then given on all sides. Towards the end of the year, on my advice, they want to make an appointment at the building authority and find out whether a building application is necessary or not. Then it can start next year.