Access panels are one of those building elements that don’t get a lot of attention, until you realise you’ve installed the wrong one. A panel that’s too small won’t allow access to key components behind the wall or ceiling. Too large, and it becomes awkward or even impossible to fit neatly into the space. Getting the size right isn’t just about preference, it’s about functionality and compliance.
So, how do you pick the right one?
Different Access Panels to Choose From
So, what sizes do access panels come in? Access panels are available in a wide range of sizes. Some are small enough to discreetly cover a cable junction. Others are large enough for a person to climb through for maintenance work. Standard sizes tend to range from 150mm x 150mm up to around 600mm x 600mm, with plenty of variations in between. Custom sizes are also possible, but you need a solid reason to go that route.
Panels can be hinged or lift-out, fire-rated or not, metal or plastic, flush or surface-mounted. And each of these has its own implications for sizing and placement. Here’s a general look at the types you’ll find:
- Hinged Panels: These are the most common. They open like a door and stay attached to the frame. Great for frequent access and often used in areas where the panel needs to blend into the surroundings.
- Lift-Out Panels: Ideal for less frequent access. The door is fully removable, which can help in tight spaces where a hinged door would be obstructed.
- Fire-Rated Panels: When fire safety is a priority, these are a must. They come in specific certified sizes and must be installed correctly to meet safety standards.
- Acoustic or Insulated Panels: Used where noise reduction or temperature control matters. These tend to be thicker and may require more space for installation.
What Impacts the Size You Need?
Choosing the right size panel depends on what’s behind it, how often it needs to be accessed, and what kind of tools or equipment will need to fit through the opening.
Purpose of Access: If the panel is only needed to check a meter or flick a switch, a small one will do. But if there’s a valve that needs adjusting or a filter that needs replacing, you’ll want a panel big enough to allow a person to comfortably reach in and work.
Clearance Space: Don’t just consider the size of the panel itself. You also need to think about the available clearance behind it. Will a pipe or fitting be in the way? Is there enough room for someone’s hand or arm to get through? The surrounding structure plays a big part in what size panel you can install.
Regulatory Compliance: Some panels need to comply with fire or safety regulations. These can dictate minimum or maximum sizes, especially in shared buildings or commercial properties.
Appearance and Placement: In residential settings, people usually prefer the panel to be as unobtrusive as possible. So, the goal is often to choose the smallest panel that still allows for effective access. In commercial or industrial spaces, function tends to win over form, and panels are more likely to be larger.
Best Practices for Choosing the Right Size
A bit of planning goes a long way. If you’re not sure where to start, this checklist can help.
- Identify the purpose – What will the panel provide access to?
- Measure the available wall or ceiling space – Make sure there’s enough surface area to install the frame.
- Measure the space behind – Confirm there’s enough room for tools, parts, or a person if needed.
- Check the manufacturer’s installation requirements – Some panels need clearance around the frame.
- Think about how often it will be used – Frequent use may require a hinged door or a larger size for comfort.
When to Consider Custom Sizing
Custom access panels can be the right choice if you’re dealing with a unique space or specific maintenance requirement. For example, if you need to align the panel with tile grout lines or fit a panel into an irregular wall cavity, custom sizing might be worth it.
However, keep in mind: they take longer to source, they often cost more, and they may not be returnable. So, unless you have a strong reason, standard sizes are the safer bet.
Get the Size Right the First Time
A well-chosen access panel will make maintenance easier, improve safety, and blend into its surroundings without drawing unnecessary attention. It’s one of those details that doesn’t take long to get right, but can cause long-term problems if it’s done wrong.
Think ahead. Measure properly. And always consider what’s behind the panel, not just what’s visible on the surface. That’s the difference between a quick fix and a future headache.
