Constructing manholes and access chambers is, let’s face it, rarely the main event of a construction project. So it’s only fair that this simple part of your project should be easy to complete, allowing you to spend more time on the more critical parts of your project. Or even if you only need to complete a manhole installation and no other site works, doing so to the right standards for Sydney projects should be easy. 

The first step to ensure a quick and easy manhole installation is knowing the standard sizing and dimensions that are required. That’s why Manhole Form Hire have created a handy guide on the requirements for Sydney access chamber installations. We’ll help you get started on building your manholes to the correct standards!

What are the manhole standard sizes I need to build to?

We’ll get straight to the point - manholes can be made in a range of sizes and shapes, depending on the needs of your project. Manhole standard sizes can vary depending on where you’re located, but the general guide for circular holes is:

Whether you have a concrete or cast iron manhole, they should be capable of sustaining the loads which the manhole chamber will be exposed to, and depending on where it is located (like above sewer lines or under roadways), these loads may vary. The size of the inspection chamber should also provide ready access for sewer or drainage inspection, cleaning, and rodding by workers. Each of the manholes you construct must have a removable cover strong enough to handle any loads inflicted upon it from a tiny hatchback to a giant semi.



As mentioned, these guidelines can vary depending on your construction’s location. That’s why we encourage you to contact relevant authorities to ensure your manhole installation meets all regional requirements.

Before you start, know the regulations

The most important part of creating your manhole successfully is ensuring your project requirements can be executed according to building codes. Manhole standard sizes can vary across states and regions, so the most important part of ensuring a smooth manhole installation is to consult the right regulations. 

Before you break ground, you should know what underground utilities and installations already exist in the area. Your manhole’s size, depth, and placement could vary based on the spacial requirements for your desired area. With manhole form hire options like elongated forms, you’ll easily be able to adjust your forms to suit these requirements on-the-go, making installing a manhole that little bit easier.

What is the manhole cover standard size?

Manhole cover standard sizes and dimensions may vary for your solid top manholes, which is why it’s essential to get the facts straight. Square or rectangular manholes have covers that typically range from 300mm x 300mm to 1200mm x 1200mm, providing a range of options to suit different applications. These sizes offer flexibility in accommodating varying access needs while ensuring structural integrity. 

On the other hand, circular manhole cover sizes commonly come in diameters of either 450mm or 600mm. These circular covers offer a practical solution for applications where a round shape is ideal. 



However, it’s important to remember that these sizes may not suit every manhole you construct. Depending on the requirements of your maintenance chamber, you may require a unique variation on these solid top covers.

With all these varying sizes and dimensions, what’s the easiest way to construct a manhole?

In a nutshell, nailing the right dimensions and sizes for your manhole installations is the key to meeting building standards and regulations. And at Manhole Form Hire, we offer fully customisable manhole forms and other equipment throughout Australia, including Sydney. Our manhole forms will allow you to effortlessly create custom manhole installations that tick all the boxes of your local regulations. Don't sweat the details of manhole dimensions - trust Manhole Form Hire to deliver the perfect solutions for your construction needs.