Can't renovate / rebuild

[Riverus]

I already built a finished house but I wanted to change some grass door to sturdy door. After recycled the grass door, I can't put the new door. It glows red on that same spot eventho there is nothing in the way. I can't even rebuild the old grass door or any kind of walls/windows/railings only on that spot.
Tried to recycle surroundings and rebuild it doesn't works. It still has the support needed to build anything but still glows red.
Pls fix because it's really annoying now that my house has stupid big open space.

[Mr Shinythings]

Are there stairs leading up to the door? I've found in the past that you have to delete the stairs before you can replace a door. Stupid, I know. But still. Also, try rotating the door before placing, sometimes it helps.