Mul-T-Lock Locksmith in Brooklyn, NY

Walk through any Brooklyn building and you'll find Mul-T-Lock cylinders on front doors, apartment entries, and commercial spaces. The brand has been the go-to high-security lock for NYC property owners for decades — and for good reason.

Mul-T-Lock cylinders use a patented telescopic pin tumbler mechanism that resists picking, bumping, and forced entry far better than standard deadbolts. The restricted keyway system means unauthorized key duplication is physically impossible — the blank doesn't exist at Home Depot or any standard key shop. Only an authorized dealer can cut a Mul-T-Lock key, and only with a key card or prior authorization on file.

For landlords and property managers, this is critical. In Brooklyn's high-turnover rental market — especially in Bushwick, Crown Heights, and Bed-Stuy — key control is a real security problem. Mul-T-Lock solves it: when a tenant moves out, you know for certain they can't have made unauthorized copies of the building keys.

We are authorized Mul-T-Lock dealers, which means we carry genuine cylinders and hardware, have the equipment to cut restricted keys, and maintain key records on file for ongoing duplication requests. We serve residential buildings, brownstone owners, commercial properties, and individual apartments across all of Brooklyn.

Mul-T-Lock is a premium product — the hardware costs more than standard deadbolts, and the installation requires an authorized dealer. Here's what to expect:

• Key duplication — starts from $35 per key. Requires your original key card or prior authorization on file.
• Cylinder replacement — from $249 installed, using your existing hardware. We replace just the cylinder and cut 2 new keys.
• Full deadbolt installation — from $350–$550 installed, includes hardware, cylinder, and 3 keys.
• Mortise lock systems — from $450 installed. Common in pre-war Brooklyn buildings with mortise pockets.
• Master key systems — call for building estimate. Pricing depends on number of units and configuration.

We give you a firm price before starting — no surprise charges at the end. If you have existing Mul-T-Lock hardware in good condition, a cylinder replacement is usually the most cost-effective upgrade path.