This is a demo store. Any orders placed through this store will not be honored or fulfilled.

Discounting locks, not your safety.

Bulldog Garage Door Lock

Price From: £55.00

43 In stock

* Required Fields


Price From: £55.00



  • Bracket (mm): 142H x 75W x 86D
  • Backplate (mm): 110H x 75W x 6D
  • Ground Tube (mm): 105H x 60 Diam
  • Hardened Steel Lock Bolt: 25mm Diam
  • Coach Bolts Supplied: M10 x 75mm

The Bulldog GD400 Garage Door Lock is a DIY WEEK Security Product of the year winner. The lock is supplied with ground tube, fasteners, back plate and high security, removable, case hardened, anti-pick and anti-drill lock bolt. It fits most metal, glass fibre, plastic or wooden garage doors.

The bolt on ‘L’ shaped bracket is typically installed on the outside of the garage door but can be installed on the inside. A reinforcing backplate is supplied in the kit to strengthen the garage door which is essential on thinner plastic and fibreglass garage doors. Like most Bulldog Security products the lock uses the tried and tested Bulldog Super Lock Bolt. No padlock is required. The coach bolts supplied are long enough for most wooden garage doors. The ground lock tube fits flush to the ground when installed with no protruding parts. When locked, the garage door is physically held to the ground making prising of the door very difficult. A dust cap is provided to prevent dirt and dust ingress into lock and lock tube. The GD400 is finished in a highly visible yellow powder coating.

Bulldog's unique Locking Bolt mechanism has been developed to offer exceptional security without the disadvantage of using padlocks. The 1 inch (25mm) diameter locking bolt has a case hardened shaft, anti drill centre pin, and incorporates a 10 pin anti pick lock offering more than one million possible combinations.

British manufactured and sold with Bulldog 5 year Guarantee.



Name Bulldog Garage Door Lock
Brand Bulldog
Number Of Keys 2

GD400 £55.00  (37 In stock)

Bulldog Garage Door Lock

Keyed Differently- 3 Kg

GD400KA £82.00  (6 In stock)

Bulldog Garage Door Lock Keyed Alike

Keyed Alike- 3 Kg