"Deck" on pillars, how to construct?

[mino]

Our house is situated on a hill. Currently, we have an entrance/patio partially on the roof of a storage shed that is level with the lower basement floor. We would like to extend the storage roof (i.e., the plot outside the entrance floor) while also creating a carport.

Similarly, we have another steeply sloped area in the garden where we would like to better utilize the plot by building a similar "balcony." For various reasons, it doesn't work to fill in the ground, partly due to its inconvenient placement and partly because it's a high drop.

My thought is that it shouldn't just be two large wooden decks being built, but that we should have the option to, for example, have grass on top, so some form of concrete slab is desirable, but I suspect that it will be a much more expensive option? What is required to create such a construction? Can one turn to a builder directly, or should we have some form of construction drawing made to ensure it's a well-thought-out construction?

 

[anaitis]

1 Likely, you need a building permit

2 Consult with a constructor to get it right.

 

[imported_Byggaren]

It entirely depends on how large the spans of the joist will be. Under 6 m, there are ready-made btg. beams + slabs that can be set up to withstand the weight of soil and lawn. But... if you intend to use the space under the joist, you cannot just lay it 'as is' and apply soil, etc. You must first perform leveling on the slabs to fill the joints. On the leveling, a moisture barrier and on the moisture barrier a self-draining stone/gravel layer before applying the soil. (Called built-up covering.)

Google this term and you will find sketches and instructions.

Then check the concrete casting companies in your area. Or Google for ERGE-bjälklag and similar.
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Builder

 

[mino]

aha, great, thanks for the tips! I think a builder should be able to handle this straightforwardly.

And we must have a building permit, but since these are relatively simple constructions in the garden, I assume that hand-drawn sketches with dimensions are sufficient, that's usually the case when it comes to patios anyway.