A door that binds is telling you where it went
The symptom locates the fault, and it is worth reading before anything is unscrewed. A door catching on the leading edge at the top, with a widening gap at the bottom of the hinge side, has dropped: the leaf has rotated about its lower fixing. A door catching along the bottom rail across its whole width has not dropped — either the floor or the threshold has risen, or the leaf has taken up moisture and swelled. A door that shuts but rattles has neither problem; that is the latch and the keep, and no amount of attention to the hinges will change it.
The distinction that matters most is between a door that has dropped and a door that has swelled, because they look similar from a few feet away and they want opposite responses. A swollen door eased in wet weather is a door with a permanent gap in dry weather. A dropped door planed to fit is a dropped door with less material and the same fault, and it will move again.
Where the weight actually goes
The load path is short and every part of it is testable. Weight leaves the leaf through the hinge leaf screws, passes through the knuckle and pin, crosses to the frame leaf, and then has to get out of the frame and into the wall. Most attention goes to the middle of that sequence — the hinge itself, which is the only part with a product name — and most failures happen at the end of it.
A hinge correctly sized for the door, screwed into a frame that is not adequately fixed back into the masonry, will pull the frame rather than fail itself. The frame flexes, the geometry changes, and the door drops. Replacing the hinge with a larger one at that point makes the leaf stiffer and the frame’s job harder, which is why the fault frequently returns worse after a well-intentioned upgrade.
So the first check on a heavy door is not the ironmongery. It is whether the frame is genuinely fixed, how many fixings there are, where they are relative to the hinge positions, and what they are fixed into.
Why period openings are harder
A frame in a modern opening is fixed into consistent material at predictable centres. A frame in a period opening may be sitting in a wall built of soft brick or rubble stone bedded in lime, in an opening that has never been square and has been moving gently for two centuries. A fixing into perished lime mortar holds very little, and a fixing that holds nothing is invisible until the door is heavy enough to find it.
Out-of-square openings compound it. Where the head is not level or the jambs are not parallel, a door hung to the frame is not hung plumb, and gravity works on it continuously in one direction. That is survivable on a light door and progressive on a heavy one. It is also the reason a survey has to be taken opening by opening rather than from a drawing — a point the studio’s regional articles keep returning to, because refronted and altered buildings make it the norm rather than the exception.
Choosing hinges as structure, not as hardware
The top hinge is in tension and the bottom hinge is in compression, and they do not wear the same way. On a heavy leaf the top hinge is the one that works loose, because it is the one being pulled out of the timber rather than pushed into it. Fixings there deserve more care than anywhere else on the door, including their length — a screw that stops in the frame is doing less than a screw that reaches what the frame is fixed to.
Beyond that the choices are ordinary and should be made on load. Washered or ball-bearing knuckles reduce the wear that makes a heavy door graunch and eventually sit low. A fourth hinge distributes rather than adds capacity, which helps a long leaf more than a merely heavy one. Positions want resolving against the rails and ledges of the door rather than set at conventional centres — a hinge screwed into the end grain of a ledge is a hinge in the wrong place.
The door will move, and the gaps are a specification
Timber moves across the grain far more than along it, and an external door moves with the season regardless of how well it was made. The clearances around a door are therefore not slop; they are a specification, and they are set for the wet end of the year rather than the dry one. A door fitted to a hairline gap in August is a door that binds in February.
This is also why easing is a last resort rather than a first one. Material removed to solve a seasonal problem does not come back when the season does, and on a historic door it is original fabric being removed to solve a temporary condition. Where a door has genuinely dropped, correcting the cause returns the clearance without taking anything off it.
On a historic door, the door is usually not the problem
The conservation default — repair before replacement — is not only a regulatory position; on this particular fault it is usually also the correct engineering one. A door that has hung for a century and started to bind in the last two years has not suddenly become badly made. Something around it changed.
That order also protects the fabric that matters. Original hinges, like original locks, are frequently the oldest surviving components of a period door, and on a listed building they may be protected in their own right — which the studio’s guide to period door ironmongery takes up in more detail. Refixing a frame is reversible. Replacing hardware to cure a fault that was never in the hardware is not.
What gets it right
Read the symptom before touching anything: dropped, swollen and rattling are three different faults with three different causes, and only one of them is about hinges at all. Check the frame fixing before the ironmongery, because that is where the load path is weakest and where period walls make it weakest of all.
Then treat the hinges as structure — size and fix the top one hardest, resolve positions against the door’s own construction, and set the clearances for the wet end of the year. And on anything historic, work outwards from the assumption that the door is not what changed.
