GU Multipoint Locks & Gearboxes

GU Multipoint Locks & Gearboxes Repairs & Replacement

Expert locksmith repairs and replacements in Orpington & surrounding areas

Is your door handle becoming stiff, loose, or failing to lock smoothly?
You might be dealing with a worn or seized GU multipoint lock or gearbox — a common issue with uPVC and composite doors.

At The Key Locksmith, we specialise in diagnosing and repairing GU (Gretsch-Unitas) door mechanisms.
We’ll restore your door to full working order — often without replacing the entire system.

📞 Call Gerry on 07803 721 200
24-hour local locksmith | Orpington & nearby areas | No call centres

What makes GU multipoint locks different?

GU (Gretsch-Unitas) is a well-known manufacturer of high-security multipoint locks used across the UK.
Unlike standard latch locks, a GU system locks the door in multiple places along the edge to provide tighter sealing and better protection.

When the gearbox, the main drive inside the mechanism, wears or cracks, the lock becomes stiff, jams, or completely fails.

Common GU lock & gearbox faults

We repair all types of GU lock problems, including:

• 🔧 Handle feels loose or heavy to lift
• 🗝️ Key turns but the door doesn’t lock or unlock
• 🚪 Door must be pushed, pulled or lifted to close
• ❌ Mechanism jammed solid or seized up
• 🧊 Lock stiffens during cold weather or damp conditions

If any of these sound familiar, your GU gearbox might be close to failure — and it’s best to fix it before it breaks completely.

Our GU locksmith services

1. GU gearbox replacement

In most cases, the gearbox is the culprit. We can replace just that component:

• Direct GU or compatible replacements
• No need for a full new mechanism
• Fast turnaround – usually within the hour

2. Full GU multipoint lock replacement

If the entire locking strip is damaged, bent or obsolete, we’ll fit a new GU or compatible multipoint system for seamless, smooth operation.

3. Door alignment & keeps adjustment

If your door is slightly out of alignment, it can strain the lock. We’ll realign the hinges and adjust the keeps to relieve pressure and extend your lock’s life.

4. Security & hardware upgrades

We also supply and fit:

• 3-Star TS007 anti-snap cylinders
• Matching handles in chrome, black, white, brass or satin finishes
• Enhanced strike plates for improved security

Why choose The Key Locksmith?

• ✅ GU multipoint system specialist
• ✅ Independent locksmith in Orpington — no middlemen
• ✅ Non-destructive techniques used wherever possible
• ✅ Transparent pricing – fixed quotes, no hidden extras
• ✅ Available 24/7 for emergency lockouts and urgent repairs
• ✅ 12-month parts & labour guarantee

📍 Covering Orpington, Bromley, Petts Wood, Chislehurst, Sidcup, Swanley and nearby Kent areas.

Do I need a new door?

Not necessarily.
A failed GU mechanism doesn’t mean your door is finished — just that the internal parts need attention.

We can:

1. Inspect your current GU setup
2. Identify exactly which part has failed
3. Replace the gearbox, strip or cylinder as needed
4. Re-align and service the door to prevent future issues

Most customers are back up and running within an hour — without the cost of a new door.

Signs your GU gearbox is wearing out

• Handle movement feels gritty or uneven
• Key turns partially, then stops
• Door only locks in a specific position
• Handle needs to be forced upward to engage the lock
• Mechanism works one day and sticks the next

The earlier it’s fixed, the less likely you are to end up locked in or locked out.

How our GU repair process works

1. Call or message Gerry – describe the issue (a photo helps)
2. Quick response – especially for stuck or jammed doors
3. On-site diagnosis – we confirm your GU model and fault
4. Repair or replace – most done immediately
5. Check and tidy up – we ensure smooth operation before leaving

FAQs – GU Multipoint Locks & Gearboxes

How do I know if I have a GU lock?
Open your door and look along the locking strip — you’ll usually see GU or Gretsch-Unitas engraved on the metal. If not sure, send us a photo and we’ll identify it.

Can you replace just the GU gearbox?
Yes. The gearbox is the main working part and often fails before anything else. We can change it without replacing the whole strip.

My GU lock is old – can you still repair it?
Yes. Even discontinued GU models usually have compatible retrofit gearboxes or modern replacements that fit perfectly.

Can you open a jammed GU lock without damaging the door?
Absolutely. We use non-destructive methods to open jammed GU locks safely and carry out the necessary repair.

Do you offer high-security upgrades?
Yes – we recommend fitting 3-Star anti-snap cylinders and upgraded hardware for extra peace of mind.

How long does a GU lock repair take?
Most gearbox or alignment jobs are finished in under an hour.

Is your work guaranteed?
Yes. All GU repairs come with a 12-month parts and labour guarantee.

Can you help if I’m locked out due to a GU lock failure?
Yes – we offer a 24/7 emergency locksmith service across Orpington and surrounding areas.

Book your GU lock repair today

Don’t let a stiff handle or jammed mechanism turn into a full lockout.
We can get your GU lock working again quickly and professionally.

📞 Call Gerry now on 07803 721 200
or
📧 Send us a message to arrange your repair or get a free quote.

The Key Locksmith – trusted local expert for GU multipoint locks and gearboxes in Orpington.
Fast, friendly and dependable service – day or night.