Can a house slab be built on a block with an easement running through it?

Generally, no — you can’t build a permanent structure like a house slab directly over a registered easement (typically drainage or sewer), since the relevant authority needs genuine, unobstructed access to what runs beneath it.

Your slab and foundation design has to work around the easement’s exact location, which your surveyor and engineer identify early using your title documents — this is exactly why confirming easements before finalising a slab layout matters, not something to discover partway through design.

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