Coming from David Bruckner's "The Ritual", which I felt was a rather successful and unique take on the creepy-cult-the-woods angle, I felt that "The Night House" could potentially at least be either as good or better, and I wasn't disappointed.
It has a lot to offer. Suspense, mystery, intrigue, jump-scares (and not of the typical variety) and, amongst others, the kind of bleak horror and dread that resembles moments in Ari Aster's "Hereditary", albeit mild in comparison.
Perhaps a better example might be Robert Zemeckis's "What Lies Beneath", both in theme and atmosphere, although "The Night House" is more arthouse and less "Hollywood". In other words, not as "Mickey Mouse".
Come to think of it, certain scenes in the third act even had similar mechanisms and occurrences to Leigh Whannell's "The Invisible Man". There might even be more resemblances to that film here than in the aforementioned pieces.
At the end of the day, this film is told well, shot well, builds even better and gives you enough information to speculate by yourself without giving it away outright. Some of the other reviewers seem to possess above average skills of deduction as they imply that "The Night House" is very predictable and obvious. I don't agree and feel that it is more than worth a watch.
In that same vein, some other reviews state that the ending is anticlimactic or disappointing. Again, I would say while not epic, it still concludes well and leaves the protagonist with substantial resolve while suggesting that the threat is likely still present, but that by then she at least knows what/who she's dealing with.
It's certainly not your standard jump-scares-and-ghosts trope fest and, depending on one's tolerance, should stay with you well after watching it.