What Are Door Chains and Restrictors?
A door chain or door restrictor is a secondary security device that allows you to open your front door a few inches — enough to see and speak to a visitor — without fully unlocking it. If the person is unwanted, you can close and lock the door without them being able to force entry.
Door Chains vs Door Restrictors — What's the Difference?
Door Chains
The traditional option: a metal chain connects the door to the frame, allowing the door to open only as far as the chain permits (usually 3-4 inches). To fully open the door, you unhook the chain from the inside.
Pros: Simple, affordable, widely available
Cons: Can be defeated with enough force; difficult for elderly or disabled users to operate
Door Restrictors (Door Limiters)
A more modern alternative: a rigid metal arm connects the door to the frame. More robust than a chain and easier to operate. Some models have a lockable release button.
Pros: Stronger than chains, easier to use, some are lockable
Cons: Slightly more expensive; requires more precise installation
Why You Need One
- Distraction burglary prevention — criminals posing as utility workers, delivery drivers, or officials use the front door to gain entry. A chain/restrictor lets you verify identity before opening fully
- Personal safety — particularly important for people living alone, elderly residents, or anyone who feels vulnerable to doorstep crime
- Additional security layer — even if your main lock is compromised, a chain/restrictor provides a second barrier
- Peace of mind — answer the door confidently, day or night
Choosing the Right Model
- For maximum strength — choose a solid metal restrictor arm over a chain
- For ease of use — look for models with a large, easy-grip release button (important for elderly users)
- For front doors — choose a model rated to BS 8220 or Sold Secure
- Material — stainless steel or chrome-plated steel resists corrosion and forced entry better than aluminium or plastic
Proper Installation Matters
A door chain or restrictor is only as strong as its mounting. The screws must go into solid timber or reinforced framing — not just into the surface of a uPVC or composite door. Incorrect installation is the main reason these devices fail under force.
Our local locksmiths can advise on the best option for your door type and install it securely.
Works Best With
A door chain or restrictor works best as part of a layered security approach:
- Anti-snap Euro cylinder as your primary lock
- Letterbox guard to prevent fishing attacks
- A door viewer (peephole) so you can see who's at the door before opening
Call 0330 133 1339 to arrange fitting. Available 24/7 across all service areas.