What Size Meter Box Do I Need?
A quick sizing guide mapping common meter box sizes to residential and commercial metering layouts.
Size follows the metering
Meter box size is quoted as width x height in millimetres and is driven by the metering layout — the number of meters, the phase configuration and the service protection. Work out what has to fit inside, then choose the box with room to dress cables.
Common sizes and what they hold
Use this as a starting point and confirm against the metering layout.
| Size (mm) | Typical use |
|---|---|
| 300 x 300 | Single meter or sub-meter |
| 400 x 400 | Compact single-phase |
| 500 x 500 | Residential upgrade |
| 600 x 600 | Full single-phase service |
| 600 x 900 | Three-phase or multi-meter |
When in doubt, size up
A cramped box costs more in labour and rework than a larger box costs to buy, and it leaves no room for the solar, EV and load growth most properties see. If there is any prospect of growth, size up one increment. EVO supplies the full range to the trade — request a quote with your metering details.
Frequently Asked Questions
What size meter box does a standard house need?
A full single-phase residential service with a main switch and service fuse usually needs a 600x600 box. Smaller boxes suit single meters, and three-phase or multi-meter jobs step up to 600x900.
Should I buy a bigger box than I need right now?
If there is any prospect of adding solar, EV charging or a secondary dwelling, yes. Sizing up one increment now is far cheaper than retrofitting a larger box later, which involves network coordination and wall repairs.
Related Products
Electrical Meter Boxes
Galvanised meter boxes from 300x300 to 600x900
Meter Box Solutions
Sort the metering enclosure before you're on site
Custom Main Switchboards
Fabricated in Sydney to your exact specification
Meter Boxes for Duplexes
Two-meter enclosures for side-by-side dwellings
Meter Boxes
Galvanised steel meter boxes
Switchboards
Main switchboards & distribution boards
Meter Surrounds
Panels & surrounds for meter installations
Electrical Contractors
Boards, boxes and metering at trade volume
Property Developers
Multi-lot metering packages and staged supply
Keep Reading
Choosing the Right Meter Box Size
How to pick between 300x300, 400x400, 500x500, 600x600 and 600x900 meter boxes for residential and commercial metering installations.
The Complete Guide to Meter Boxes
Everything trade buyers need on meter boxes — sizing, materials, mounting, sealing, IP ratings and how to order the right enclosure the first time.
How to Choose the Right Meter Box
A quick decision guide to picking a meter box — matching the enclosure to the metering, the environment and the mounting method.