Hi @Ryancito,
Thank you for your question about wall anchors for your plaster walls.
Floated plaster is a technique that is often referred to as a level 5 finish where the entire wall is skimmed with plaster. A thin coat of plaster is applied to the whole wall and a wide skimming blade like this Intex PlasterX 800mm Drywall Skimmer is used to achieve a perfectly flat surface. It can be done over either plasterboard or masonry, so we'll need to know what is behind the floated plaster to select the right anchor.
Your choice of anchor comes down to what is behind the plaster. Being internal walls, it's likely they are either timber or metal studs. Considering the house is newly built, you might have access to building plans that could shed some light.
If you have timber or metal stud walls with skimmed plasterboard, your best option is to screw into a stud. Studs can be found with a stud finder. Check out How to use a stud finder for some guidance on their use.
Where a stud isn't available, you can use these Ramset Nylon WallMate Plasterboard Anchors for things up to 10kg. For heavier things, Ramset Super Wallmate Toggle Anchors are a good option.
If the walls are masonry, like brick, block or concrete, you can use Wall Plugs.
Check out How to hang just about anything for some further guidance.
Jacob
