This mod only uses in-game materials, nothing has been added. I used the forgotten construction set to build the mod. Materials cost nothing and weigh nothing. Everything costs 1 material and takes very little time to construct. There's less grinding, but you still have to work for it. Overall, it's now easier to purchase and transport Building materials compared to the default game settings, but it is still balanced because there is now so much more to build.
More materials can be stacked than the default settings. Walls will only cost 1 building material to construct. Expanded Construction offers 14 new outdoor buildings and 11 new interior decorations.