Door Knockers and Letterplates: Styles, Sizes and How to Choose the Right One

Why Entrance Hardware Deserves Its Own Decision

Door levers and cabinet pulls tend to get all the attention in a renovation, but the knocker and letterplate on your front door are the two pieces of hardware a visitor touches and notices before anyone says hello. Because they sit at eye level on an otherwise plain door face, a knocker or letterplate in the wrong size, finish or position reads as an afterthought. Getting the sizing and placement right is mostly a measuring exercise, not a style one — this guide covers both.

Door Knocker Styles and Sizing

Solid brass knockers are generally sold in three shapes, and each suits a different door style:

• Ring knockers — a circular ring on a fixed backplate, usually 120–180mm in overall height. They suit panelled and period-style doors where the backplate becomes part of the design.
• Bar or pull knockers — a straight or gently curved bar mounted on two fixings, typically 150–220mm long. These read as more architectural and work well on flush, minimal entry doors.
• Urn or centre knockers — a compact knocker built around a central striking point, often under 150mm, suited to narrower door stiles or secondary entry doors.

Most solid brass knockers are cast rather than pressed, which is why they feel noticeably heavier in hand than hardware store equivalents — expect somewhere in the 300–600g range depending on size. They fix through the door with two bolts that pass fully through to a strike plate or backing nut on the inside face, so the mounting hardware needs to suit your door thickness, not just the door's width. Standard external doors run 40–50mm thick; always confirm this measurement before ordering, since fixing bolts that are too short won't seat properly and bolts that are too long will need trimming.

Letterplates: Aperture Sizes and Placement

Letterplate sizing is driven by what needs to fit through the slot, not aesthetics alone. Two aperture sizes cover most standard mail: a 40mm x 260mm opening handles folded A4 and standard envelopes comfortably, while a narrower 32mm x 300mm opening suits a more streamlined design and smaller mail items. If you regularly receive A4 documents unfolded, check the exterior plate's internal aperture against the actual paper size rather than relying on the advertised exterior dimensions, which include the surrounding frame.

Placement is a comfort-and-practicality decision: a letterplate centred between 760mm and 1000mm from the ground sits at a natural reach height for posties and couriers and keeps mail clear of door furniture lower down. On a door with a narrow mid-rail, centring the plate on that rail usually looks more deliberate than centring it on the door as a whole.

One detail that's easy to miss: letterplates come with a sleeve (sometimes called a tunnel) that spans the thickness of the door between the exterior and interior plates. If your door is unusually thick — a solid timber entry door at 54mm or more, for example — check the sleeve length before ordering rather than after, since a sleeve that's too short leaves a gap where draughts and light get through.

Matching Finish to the Rest of Your Entrance

A knocker and letterplate are usually the last pieces chosen in an entrance, after the door furniture itself, which makes matching straightforward: pick up whatever finish you've already specified for the entry set. Bergamo's solid brass hardware is available in Brushed Brass, Antique Brass and Aged Brass — three distinct finishes with different depths of tone — as well as Black Brass, and Nickel, Polished Nickel and Aged Nickel. If your entry door furniture is Aged Brass, for instance, ordering the knocker and letterplate in the same finish (rather than the closest brushed option) keeps the three pieces reading as one considered set rather than three separate purchases.

On a front door that sees daily use, a solid brass knocker's weight is part of the point: a lighter, hollow knocker tends to feel and sound noticeably different, and the difference shows up quickly.

Measuring Your Door Before You Order

Because these pieces are made to order rather than stocked in bulk, it's worth measuring twice before placing an order:

• Door thickness, measured at both the knocker height and the letterplate height (some doors taper slightly).
• Whether you're replacing existing hardware — if so, measure the existing fixing centres and aperture so the new piece covers any marks left behind.
• The door's stile and rail widths, so the knocker or letterplate you choose actually fits the flat section of the door rather than overlapping a panel edge or glazing bar.

Pieces in this range typically sit toward the lower-to-middle end of Bergamo's $35–$399 AUD pricing, and because each is made to order in solid brass, it's worth building a short lead time into your renovation or build schedule rather than ordering the week the door is due to be hung.

Bringing It Together

A knocker and letterplate are small purchases next to a full hardware schedule, but they're also the pieces most likely to be touched, photographed and noticed at the threshold. Measure your door thickness and aperture needs first, choose a style that suits the door's proportions, and finish it to match the rest of your entry set — in that order, the decision is quick rather than fiddly.