If you've searched for a solution to a shallow or misaligned electrical socket, you'll have come across two common products: dry lining boxes and socket spacers. They solve similar problems but in different ways. This guide explains the distinction and helps you choose the right solution.
Dry Lining Boxes
A dry lining box is a complete replacement back box designed specifically for installation in plasterboard (dry-lined) walls. It typically features:
- Lugs or flanges that grip the plasterboard from behind
- A deeper profile to accommodate modern faceplates
- An adjustable depth so the front sits flush with varied plasterboard thicknesses
Use a dry lining box when you're installing from scratch in a plasterboard wall, or when the existing back box is badly positioned, cracked, or too small. Fitting one requires cutting a new hole and re-wiring — a bigger job, but the right solution when the box itself is the problem.
Socket Spacers
A socket spacer is an adaptor that fits between an existing back box and the faceplate. It doesn't replace anything — it simply corrects the depth offset at the surface level.
Use a socket spacer when:
- The back box is in good condition and correctly wired
- The plasterboard or plaster finish has made the box recess too deep
- You need a specific depth not available in standard dry lining boxes
- You want a quick, non-invasive solution
The Custom Advantage
Standard dry lining boxes come in limited sizes. Our custom socket spacers are manufactured to your exact specification — width, height, depth, corner radius, and fixing lug configuration. This means you get a perfect fit every time, without compromise.
Quick Comparison
| Feature | Dry Lining Box | Socket Spacer | |---|---|---| | Replaces back box | Yes | No | | Fits any depth | Limited sizes | Fully custom | | Installation complexity | High | Low | | Suitable for retrofit | Sometimes | Yes | | Cost | Higher | Lower |
Not Sure Which You Need?
If your existing back box is secure, correctly earthed, and wired, a socket spacer is almost certainly the right choice. It's quicker, cheaper, and less disruptive than replacing the box.
Use our Build My Spacer tool to specify your exact dimensions and get a custom spacer shipped to your door.