How to fit a door knocker

Video by Best Bricky. This guide is informed by "How To Install Front Door Knocker" from Best Bricky (BB Academy), a practical UK building and trades channel. The video is a useful watch for seeing how the bolt-through fixing method works, which is the tidiest approach on a solid timber or composite door.

1. Choose the right knocker for your door type

Door knockers come in two main fixing types — surface-fixed (screws into the face of the door) and bolt-through (a longer bolt passes through the door and is secured with a nut on the inside). Bolt-through fixings are stronger and neater on solid timber and composite doors. Surface-fixed knockers are fine for most decorative applications and are the easier option if you would rather not drill all the way through.

If you have a uPVC door, check before you buy. Some uPVC doors have a steel reinforcement inside the stile, which means you can bolt through perfectly well — but you will need the right drill bit and a little patience. Others have foam-filled profiles that make a bolt-through fixing less secure. In that case, a heavy-duty adhesive-backed surface fix or specialist uPVC fixings are the better route.

2. Position the knocker on the door

The standard position for a door knocker is roughly in the centre of the door, horizontally, and at about eye level — somewhere between 1,450 mm and 1,550 mm from the bottom of the door. That said, if the door has a glazed panel, a letter plate, or decorative mouldings, the knocker needs to sit clear of all of them. Hold it up in a few positions before you mark anything.

Tall people tend to mount knockers a little higher than they need to be. If you have visitors of varying heights — or if you want it to be reachable by children — err on the slightly lower end of the range. Once you have settled on the spot, hold the knocker in place and get someone else to stand back and check it looks centred and level. It is much easier to move a pencil mark than to fill an unnecessary hole.

3. Mark the fixing holes precisely

Hold the knocker firmly against the door in the chosen position and use a sharp pencil or a bradawl to mark through the fixing holes. On most knockers there will be two holes — one near the top and one near the bottom of the backplate. Make sure you are holding the knocker level while you mark; this is worth double-checking with a small spirit level before you commit.

For a bolt-through knocker, the bolt holes need to be drilled cleanly all the way through, so accuracy matters more. Mark an X at each fixing point, not just a dot — it is easier to centre the drill bit on an X. Step back and take another look once the marks are on the door.

4. Drill the fixing holes

Start with a small pilot hole at each mark — a 2 mm or 3 mm bit is ideal. Keep the drill perpendicular to the door; a drill that wanders off-angle on a bolt-through fixing will make the nut very difficult to tighten neatly on the inside. Drill slowly and steadily, particularly on composite or timber doors where you want a clean entry point.

For a bolt-through fitting, open out the pilot hole with the appropriate bit for the bolt diameter — usually 6 mm to 8 mm depending on the knocker. On uPVC, use a sharp HSS bit and go steadily. If the door has glass anywhere nearby, stick a piece of masking tape over the drill entry point — it stops the bit skipping across the surface before it bites.

5. Fit the knocker and tighten the fixings

For a surface-fixed knocker, align the backplate with the holes, insert the screws, and tighten them down evenly — a little on each screw in turn, rather than fully tightening one before moving to the next. This keeps the backplate flat against the door rather than pulling one side tight and leaving the other proud. Do not overtighten on timber; you can easily pull the screw head through a thin backplate.

For a bolt-through knocker, pass the bolts through from the front, then go inside the house to fit the washers and nuts. Tighten with a spanner until the knocker is held firmly against the door and does not wobble, then give the nuts a final quarter-turn. On composite doors, it is worth using a rubber washer between the nut and the door surface to stop any vibration buzzing through the door over time.

6. Fit the striker plate and test the knocker

Most door knockers come with a small striker plate — a metal plate screwed to the door that the knocker ring or bar hits against. Without it, the knocker will either mark the door surface over time or make an unsatisfyingly soft thud. Position the striker plate exactly where the knocker falls when dropped from its natural resting position, mark the holes, drill pilot holes, and screw it in.

Give the knocker a proper test knock once everything is fixed. It should make a solid, clear sound and the knocker should swing freely without catching on the backplate. If it binds, the fixing screws may be slightly out of line — back one off a fraction and it usually sorts itself. Stand back, check it is level one last time, and you are done.

When to call a handyman

Call Richard if you are not confident drilling into a composite or uPVC door without cracking the surface, if the door has a steel core that is defeating the drill, or if you would simply rather have it done properly in fifteen minutes than spend an afternoon wrestling with it. Fitting a door knocker alongside a new letter plate, house numbers, or a fresh coat of paint on the front door all make sense to do at the same time — it is the kind of small job that is very satisfying to get right.