It is the same price for a 2 layer PCB so why not just make it like that? Otherwise, see: [https://easyeda.com/forum/topic/How-to-layout-a-single-layer-PCB-3f14f6957f0748f18b7dad53bb5d38b2](https://easyeda.com/forum/topic/How-to-layout-a-single-layer-PCB-3f14f6957f0748f18b7dad53bb5d38b2)

Right, thanks :) Coming from an "old school" I always tend to optimize and use less resources as possible. I decided to go on "new school" and use two layers anyway :) Thanks

If laminates were made with only one side covered in copper foil then there might be a case for it "using fewer resources" but because automated PCB fabrication uses a minimum of a fiberglass laminate with a copper foil on both sides there is no saving in copper or etching. In fact on a modern production line, the production of a single sided PCB actually requires extra steps and is more prone to warping than with copper on both sides. Making full use of both sides allows the layout and routing to be better all round. Less routing congestion, tracks can be routed in one direction on one side and  at right angles on the other to minimise crosstalk. It makes power supply routing and power and ground planes easier so potentially allowing improved EMC, Signal Integrity, Power Integrity and thermal management.

@andyfierman Got it ! Thanks for the explanation !