Door Frame out of true one side is uneven and door not closing properly

Hi nlondon Unfortunately if the frame has sunk on one side due to subsidence there isn't a lot you can do without it being quite costly, however, there are a few cheaper options. The cheapest and quickest option would be just to plain the door to suit the frame so it closes properly. But if that would drive you mad with it looking un-level, the 2nd option would be to take off the architraves carefully so not to disrupt the plaster to reveal the frame. Remove the frame by running a hacksaw blade down the edge of the frame and the wall to cut the screws that attach the frame the the wall. Once the frame is out you can cut 15mm off the other leg of the frame and then replace and re-fix it back into its aperture. Yes, the frame will sit 15mm lower than before but at least it will be level. You can then re-fix the architraves and ease the door accordingly. If down the line you have the same problem i would seriously consider looking at underpinning the house's foundations as there could be a major issue with the foundations sinking

Hi nlondon Another possibility if you don’t want to take frame out (this can be really messy if it’s a old house ) is to take architrave off and glue and pin /screw wedge shaped pieces in the head of the frame 15mm to 0 then refit architrave , although as said above the subsidence may need investigating if it’s that bad Good luck !