Our Lock Guide: How to Identify & Choose Door Locks in Glasgow & Paisley

When customers call us for a quote, the first question we ask is: “What type of lock is it?” Not all locks are the same. This guide helps you match the lock on your door to its type — making it easier for you to understand your options, request services, and decide on upgrades.

We serve Glasgow, Paisley, Renfrewshire, and surrounding areas, offering lock changes, repairs, upgrades, and high-security installations.

1. Yale / Cylindrical Lock

• Appearance: Rectangular faceplate (brass, chrome, or painted).

• Use case: Common on wooden internal and external doors.

• Security features: Many are “BS / anti-pick / anti-drill” versions.

• Pros / Cons:
   + Easy to replace and widely available
   – Basic models may be vulnerable to lock-picking or drilling

• Tip: Look for a “BS” stamp or security rating for assurance.

2. Euro Cylinder Lock

• Appearance: Round “lollipop” cylinder shape.

• Installation: Can be fitted with or without door handles.

• Variants:
   – Single cylinder (key both sides or with thumb turn)
   – Double cylinder (key both sides)
   – Thumb-turn variant (on inside)

• Best use: Ideal for uPVC, composite, wood doors.

• Pros / Cons:
   + Flexible, easy to upgrade (e.g. anti-snap cylinders)
   – Low-cost versions may lack security enhancements

• Tip: Ask for anti-snap / anti-drill euro cylinders if you want better protection.

3. Oval Cylinder

• Look: Oval shaped cylinder, often beneath handle hardware or rose covers.

• Use case: Often used with older wooden doors or traditional fitting.

• Protection: Pair with escutcheons or protective plates to resist drilling or snapping.

4. Scandinavian / Nordic Door Lock

• Location: Usually above the handles, in a long case.

• Design: Contains two lock mechanisms (interior + exterior) operating with the same key.

• Optional: Thumb turn can be fitted on the inside.

• Advantages: Robust and highly secure; good for wood, composite or insulated doors.

5. Mortise Lock / Sash Mortise

• How to spot: Keyhole set into the door’s edge; mechanism inside the body of the door.

• Types: 3-lever, 5-lever, British Standard (BS3621) mortise locks.

• Sash variant: Combines latch + deadbolt with handle operation.

• Strengths: Durable, high security especially in well-made models.

6. Yale Nightlatch

• Placement: On rear side (interior) of a Yale or external door.

• Forms: Latch, roller bolt, or with extra deadbolt locking.

• Use: Common on back doors or doors where you want latch + extra security.

🔍 Choosing the Right Lock

🏠 Local Lock Services: Glasgow & Paisley

If you’re not sure what lock you have or want to upgrade your security, ALS Locksmiths can help. We provide professional services across Glasgow, Paisley, Renfrewshire:

• Lock replacement & upgrades

• High-security / anti-snap cylinder installation

• Emergency lockouts & lock repair

• Advice for dementia-friendly and user-friendly locks

📞 Contact us today at 077 12 445612 and ask for Steve