Answer
Can decking be laid on soil or grass?
No; it needs a ventilated substructure on sound foundations, not boards on soil.
In short
Not directly. Decking needs a proper, ventilated substructure on sound foundations, not boards laid straight onto soil or grass, which traps moisture and rots the timber and lets the deck sink and sag. The frame and the ground preparation underneath are what make a deck last. We build it properly.
Arrange a consultation
Send a few photographs and a sentence about the site. We will reply personally.