basement walk out door to the garden

Before deciding to spend the money on a new door the air leak issue might be fixed by having the existing door re-installed properly as you indicated the door was installed by the previous homeowner. A professional door installer should be able to determine if a fix is possible or not.

You will need to replace the door brick to brick.

Cold air leaks around basement walk-out doors are often caused by improper installation or frame misalignment rather than just worn seals. If weatherstripping and foam haven’t solved the problem, it’s very likely the door and frame need to be re-installed correctly. 📌 What we recommend: First, check alignment of the door and frame. In many DIY installs, the frame isn’t squared properly. A professional re-installation of the existing door can often fix the gaps without replacing the door. If the frame or door itself is warped/damaged, then replacement would be the longer-term solution. 👉 A site visit from a door installer will quickly determine whether a proper reinstallation is enough or if a full replacement is required. Best regards, Fortis Build Group

If the gaps are large and the frame’s out of alignment, replace the door and frame — no amount of foam will fix a bad install. If the frame’s solid and square, re-shim, adjust hinges, and install an adjustable threshold with quality compression weatherstrip.

The door slab could be out of plumb. If this is the case, replacing the weather strips will not help, until the slab is level in the frame. The slab can be adjusted via the hinges as long as the frame was installed level. In the event the entire door frame is not in level, you could re install the door. Please note, re installing an old door comes with risks due to shifting and material decay, it is up to you to determine if it is worth paying to attempt to re install an old door, at the risk of liability. Getting an installers opinion may be wise before commitment, an installer could determine if the door is beyond repair or worth salvaging. Saving the money to put toward an entirely new door is always the safest option that will guarantee no further leaks.