Most people do not decide to replace a front door. They arrive at it. There is a draft, then a lock that needs lifting, then a winter where the deadbolt will not throw without a shoulder against the slab, and at some point somebody says the word “replace” out loud and nobody argues.
The frustrating part is that the decision is usually made at the worst moment — in February, on the coldest week, under pressure. It is a much better decision made deliberately, and it comes down to a small number of questions that anyone can work through in an afternoon.
Start with the frame, not the door
This is the single most useful reframing, and it reverses how most homeowners look at the problem. People inspect the slab — the door itself — because that is the part they see and touch. But the frame is what determines whether a repair is possible.
A tired slab in a sound frame is a straightforward swap. A perfect slab in a rotted or racked frame is a problem that no amount of hardware adjustment solves, because the opening itself is no longer square.
How to check the frame in five minutes
Open the door roughly halfway and let go. A level, well-hung door stays put. If it swings open or closed on its own, the frame is out of plumb. Then close it and look at the gap around the slab from the inside — it should be even, roughly the width of a coin, all the way round. A gap that tapers from top to bottom on the latch side means the opening has moved.
Next, press a thumbnail into the bottom of the jamb on both sides and into the sill. Wood that gives, crumbles, or feels spongy is rot, and rot at the base of a jamb is rarely limited to what you can see. Finally, sight along the hinge jamb from floor to head. It should be straight.
Things that are repairs, not replacements
A great many door problems look terminal and are not. If the frame checks out, most of the following are ordinary residential door repair work:
- Drafts. Nearly always the weatherstrip, the sweep at the bottom, or the threshold adjustment — all replaceable parts, none of which require touching the door itself.
- A deadbolt that binds. Usually hinge screws that have loosened and let the slab drop a few millimetres, or a strike plate that needs repositioning. A long screw into the stud behind the hinge solves a startling number of these.
- A door that sticks in summer. Seasonal swelling on a wood door. Planing is a last resort; adjusting hinges first is better.
- Peeling or chalked finish. Cosmetic on fibreglass and steel. On wood it is worth taking seriously, because a failed finish is how water gets in.
- Worn or dated hardware. Locks, handles and hinges are consumables.
- A failed glass insert. Fogging between the panes of a decorative lite is a sealed-unit failure, and the insert can often be replaced on its own.
None of these, on their own, justify a new door.
Things that genuinely point to replacement
Equally, there are conditions where repair is money spent twice. The clearest signals:
Rot that has reached structure
Surface rot on a jamb can be cut out and spliced. Rot that has travelled into the sill, the sub-sill or the framing around the opening is a different job, and at that point the frame is coming out regardless — which makes a full entrance door replacement the sensible unit of work rather than a patch.
A slab that has delaminated or warped
Steel doors that have dented and rusted from the inside out, fibreglass that has cracked through, or a solid wood slab that has bowed enough to stop sealing. A warped slab cannot be straightened in place.
An opening that has moved
Where the house has settled and the opening is visibly out of square, a new slab in the old frame will bind exactly as the old one did. The frame has to be reset or replaced for anything to work properly.
Damage from a forced entry
A kicked door usually takes the jamb with it. If the strike area has been torn out rather than dented, there is often nothing solid left to anchor new hardware into.
Security or insulation that is simply out of date
A hollow slab, a frame with no reinforcement at the strike, or a door with no meaningful thermal break is not broken in the mechanical sense. It is just not doing the job a front door is now expected to do.
The cost question, honestly
Nobody can give a real figure without seeing the opening, and any article that quotes one is guessing. But the structure of the decision is predictable, and that is more useful than a number.
A slab-only replacement reuses the existing frame and is the cheapest path — available only when the frame is genuinely sound and the new slab matches the old in size and hinge placement. A pre-hung unit replaces slab, frame and threshold together as one assembly; it costs more and is far more forgiving of an opening that has moved. A full-frame replacement goes back to the rough opening and is the most involved, usually because of rot or because the opening is being resized.
The trap is spending repair money three times over two years and then replacing anyway. One honest rule helps: if the repair does not address why the problem happened, it is a deferral rather than a fix.
Timing it well
Ontario makes this easy to get wrong. Doors fail in winter because that is when the gaps show, the materials are least forgiving and the house moves most. But winter is also when the opening is hardest to work on and when a door standing open matters most.
If the door is functional but clearly tired, autumn is the better window. If it has already failed, the question is only whether a temporary repair — a new sweep, a hinge adjustment, a strike reposition — can carry it to spring safely. Often it can.
And if the slab is being replaced anyway, that is the moment to get the frame, threshold and hardware all specified together rather than one at a time. Planning the door installation as one job is usually what keeps the result square and sealed.
A short decision checklist
- Does the door stay put when released halfway? If no — frame.
- Is the gap around the slab even? If no — frame.
- Does any wood at the base of the jamb or sill give under a thumbnail? If yes — rot.
- Is the slab flat against the stops along its full height? If no — warp.
- Does the deadbolt throw fully without lifting or pushing the door?
- Is the problem explained by a part that can be replaced on its own?
Frame or rot answers push toward replacement. Hardware and weatherstrip answers point to repair.
Frequently asked questions
Can I replace just the slab and keep the frame?
Yes, when the frame is sound, square and the new slab matches on size, swing and hinge locations. It is the least disruptive option. It is also the one most often attempted on a frame that should not have been kept.
My door only sticks in winter. Is that the frame?
Possibly, but check the hinges first. Screws work loose over years and let the slab sag, and the effect shows up most when materials contract. Replacing the top hinge screws with longer ones that reach the framing is a common, cheap fix.
Is a steel door always more secure than fibreglass?
Not by itself. Security at an entrance comes mostly from the frame reinforcement, the strike, the deadbolt and how well the hinges are anchored. A good fibreglass door in a reinforced frame outperforms a thin steel door in a weak one.
How much of the draft is the door and how much is the frame?
Easy to test: close the door on a sheet of paper at several points around the perimeter. Where the paper pulls out easily, there is no seal. If it pulls out freely at the top but grips at the bottom, the problem is geometry rather than weatherstrip.
Does a new door need a new lock?
A new slab needs the lock holes bored or the existing hardware transferred, and existing hardware often does not line up on a different slab. It is worth treating lock and door as one specification rather than assuming the old set will fit.
The short version
Check the frame before the door. Hardware, weatherstrip and finish problems are repairs. Rot, warp and a moved opening are replacements. Most Toronto front doors that get replaced in a panic in February could have been assessed calmly in October — and a fair number of them would have turned out to need a hinge screw and a new sweep.
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