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What Are Socket Spacers and Why Do You Need One?

Light switch and plug socket spacers - what they are, when you need them, and how to choose the right one for your installation.

Luke Thompson3 min read

Whether you're a seasoned electrician or a confident DIYer, you've probably encountered the frustrating situation where a wall socket or light switch sits proud of the wall, or where a back box is simply too shallow to accommodate a modern faceplate. That's where socket spacers - also known as dry lining boxes, pattress spacers, or surface mount adaptors - come in.

What Is a Socket Spacer?

A socket spacer is a thin frame that sits between your electrical back box and the faceplate of a socket or light switch. Its primary job is to add depth to the installation, bringing a sunken faceplate flush with the wall surface, or providing more wiring space behind a faceplate.

Socket spacer fitted behind a UK double gang light switch, with another alongside for reference

When Do You Need One?

You're likely to need a socket spacer if:

  • Your faceplate doesn't sit flush against the wall, leaving a visible gap
  • The back box is too shallow for a modern dimmer switch or USB socket
  • You've re-plastered or tiled and the wall surface is now proud of the box
  • You're installing a conversion kit that requires a specific depth

The Benefits of Custom Spacers

Off-the-shelf spacers come in fixed depths - typically 10mm. But every installation is different. A custom spacer made to your exact specification means:

  1. Perfect flush fit - No more unsightly gaps or bulging faceplates.
  2. Total customisation - Specify the exact width, height, depth and corner radius required to match your faceplate.
  3. A professional finish - One less thing for a building inspector or eagle-eyed customer to notice

At SocketSpacers.com, every spacer is made to order. Specify your exact width, height, depth, corner radius, and whether you need fixing lugs - and we'll manufacture it to your precise requirements.

Custom sizes of socket spacers available

Installation Tips

Installing a socket spacer is straightforward, but a few tips make the job easier:

  • Always isolate the circuit before working near any electrical installation
  • Check the depth required with a straightedge against the wall surface
  • Use the correct length fixing screws to pass through the spacer and engage the back box threads
  • If using fixing lugs, ensure they align with the back box fixing points
  • Sometimes it's possible to install the spacer without disconnecting any wires, but otherwise, take a photo and make sure you put them back in the right places

Ready to Order?

Use our Build My Spacer tool to configure your perfect spacer and get a quote. The whole process takes about two minutes, and we'll direct you to our secure checkout to complete your order.

Need a Custom Socket Spacer?

Use our configurator to specify your exact dimensions and order in minutes.

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