I’m thinking Room 6, but that movie is from 2006.

It’s not Haunting of Winchester House unfortunately, but thanks. It’s not Room 6 either (it’s not set in a hospital). It’s not Dead End either but shares some stuff in common with these.

Of course it could be The Others (2001). You can watch the trailer on youtube and see if it's it.

Definitely not, it’s set modern day. More of a dying dream than they were dead all along.

I’m pretty sure I’ve seen it and I’m also fairly sure it came out the same year as We Are Still Here. But I can’t for the life of me remember the name.

I think you are totally correct on the year, I checked my entire watch history and expected to see it on there around the time I saw We Are Still Here. I originally thought I watched the mystery film in 2016 but it would have been 15-16 for sure.

Hoping my subconscious will come up with it..

that flashing red light detail really rings a bell ..

That happens throughout the movie, weird stuff happening in the ‘dream’ are things from reality bleeding through into it like the sirens and lights.

Did it have a name something like, Home Buyers; House for Sale; Looking for a House?

About the only other thing I can suggest isn't really in a house, but in a motel.

It was definitely a house, and the title could be familiar. It’s fading out of my memory a fair bit. Annoying that I can only remember that particular scene vividly and seems like it could be from so many movies.