A Guide to Multibank Letterboxes

  • by Daniel Wood

Multibanks provide bulk letterbox solutions for large scale, multi-dwellings like apartment buildings, unit blocks and business complexes. It's an efficient and practical way to provide multiple tenants in one lot with their own compact letterbox, rather than having individual standard letterboxes for everyone.

Adelaide Letterboxes specialises in multibank letterboxes and has a long history of supplying them across Adelaide and Australia. Chances are you've come across of our multibanks somewhere out there. Our most common clients are strata management corporations who organise for multibanks to be put in where needed. They can vary in size from 2 boxes all the way up to 72 boxes and there are many different ways our clients can customise their multibank to suit their needs.

Let's have a look at all the elements of a multibank and what you need to know.

Disclaimer: Most fo the images in this article are of our old style multibanks. We are slowly transitioning to our new style and don't have a wealth of images of them at this stage. This will be updated soon. See our product pages for some images of the new style. 


Your multibank can be as small or big as you need it to be, within limitations. We generally would not recommend having more than 6 boxes high, as this would put the top boxes out of reach for the average human. Most would also not go more than 12 boxes wide as the weight starts to get into astronomical range beyond that. A multibank of 6x12 or 72 boxes, weighs roughly 150kgs. This provides challenges for installation and transport, so we generally recommend splitting it up into two smaller banks that can be installed right next to each other, if you need that many.


By orientation we mean the size of the mail slots, which in turn dictates the size of the boxes themselves. Here at Adelaide Letterboxes we have either landscape or portrait orientation. This means the mail slot will be as wide as an A4 piece of paper either at landscape orientation, or portrait orientation. This is an important choice because it greatly affects the size of the unit. Portrait boxes are narrower than a landscape box by about 100mm, so the space saving can really add up if you are purchasing a larger bank.

ground mounted on posts multibank classic cream with front opening landscape boxes

Landscape sized boxes, mounted on posts in the ground.

It's important to note though, that the boxes are still the same size, just with the dimensions flipped. So a portrait box may be 100mm narrower in the width, but it makes up for it by being 100mm deeper in depth. This means that either style of box will be able to fit an A4 piece of paper lying flat in the bottom of the box. It just affects what way it goes in through the slot. This means that any large A4 sized mail will not get crushed or folded in order to fit in the box, no matter what style you go for.


Multibanks can be installed in a variety of ways, and the choice is up to you. It all depends on how much space you have and the context of your building. 

Post Mounted Multibanks

One way is to be mounted on two posts that are bolted onto concrete, or cemented into the ground. You'll often see this with business complexes, aged care facilities and unit blocks in suburban areas, as long as they have the space to do so. 

portrait rear opening multibank on psots in ground
Ground mounted, rear opening portrait sized multibank.

A common practise for multibanks that are mounted on two posts is to have a signage plate above the bank that displays the street name and number for ease of navigation. See image below. 

cream multibank bolted onto posts on concrete with signage plate

An example of bolted onto concrete with a signage plate between two posts. 

Wall Mounted Multibanks

The other option is to have it built in. They can be bolted onto a wall, with the bank protruding out in its entirety, or they can be recessed into the wall so that the front of the letterboxes sit trim with the wall. Obviously, with a recess you need a deep enough wall, and with a protruding one, you need enough space in a hallway or foyer entrance area. These are common with urban apartment blocks and allows the letterboxes to be inside, behind locked doors for added security.

multibank letterbox built into wall portrait opening
Multibanks built into a wall with portrait sized, front opening boxes. 


Another huge benefit with our multibank letterboxes is their ability to be either rear or front opening. You may think this doesn't sound too important, but it is, and it's especially dependent on where it will be installed.

If your multibank is to be installed on a wall, it's pretty much a no-brainer that you need front opening, unless you have the bank open up on the other side of the wall. In this case, a rear opening unit is ideal as it provides extra security. We often see multibanks with attempted break ins where the doors will be bent upwards by a screwdriver. Having a rear opening door on the other side of a wall where the public can't get to, is a good way to stop this. At the end of the day this all comes down to where it is installed and what is practical for the tenants.

2 rear opening landscape multibanks

A multibank of two, with rear opening doors.


Multibank cladding is the layer that surrounds the outside of the unit. It provides a protective layer and also finishes it off nicely for an appropriate look. We offer a standard 1mm thick cladding around most multibanks, and can do thicker, more heavy duty cladding on request.

adelaide letterboxes multibank cladding
1mm thick cladding on multibank
adelaide letterboxes multibank cladding
Multibank without cladding


Multibanks are rarely purchased in anything too wild when it comes to colours. We have our full COLORBOND® range available, however we usually just see black, Monument®, and Surfmist®. Most people stick with neutral colours that won't attract too much attention, and work well with their surrounding urban environment. 

Numbering and Text

Traditionally, most multibanks employ a black vinyl strip that runs across the entirety of the bank, with smaller white vinyl stick on numbers and lettering. You've most likely seen this, it's a very common style of numbering multibanks. However, Adelaide Letterboxes is trying to expand into more stylish looks, offering larger vinyl stick on numbers with a choice of colour and font. This makes it more pleasing to the eye, and also easier for both tenants and posties to find the right box.

Try gold, black, white, silver or charcoal numbers in any Microsoft Word font you like!

front opening landscape multibank built onto wall

Front opening, landscape, multibank built onto wall with new style numbering.

Made to order, Australian Made Multibanks

All our multibank letterboxes are made to your specifications right here in our North Plympton, South Australia factory. We fabricate, treat and powder coat all our own metals in order to craft your letterboxes. We also offer installation for most of our multibanks and we are happy to discuss this if you need. 

The best multibank letterboxes in Australia

As you can see, there are a lot of elements that make up a multibank letterbox. This is for good reason, as everyone has a different situation and needs something tailored to suit them. We are always open to chat about the options and provide deeper insight, just give us a call or drop us an email!

Check out our multibanks today!


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