High Security Locks in Scarsdale: Which Doors Need Them
A high-security lock is a cylinder built to resist picking, bumping and drilling, with keys that cannot be copied at a hardware store kiosk. For most large single-family houses in Scarsdale, the real benefit is key control: you decide how many keys exist and who can make more. It is worth putting on the doors that matter (the front door, the door from the garage into the house, and whichever back or mudroom door the household actually uses), and only if the door, frame and strike plate are strong enough to match.
What "high-security" actually means
The phrase gets printed on a lot of packaging. On a lock that earns it, it means three specific things.
Key control
An ordinary house key is cut on a blank that any hardware store sells, so anyone holding your key can have a copy made in a few seconds. A high-security system uses a patented or restricted keyway. The blanks are not sold to the public. Copies are cut by the manufacturer or by a dealer registered for that system, usually only for people named on the owner's authorization record, often against an ID card or a signature on file.
Patents expire. A utility patent runs 20 years from its filing date, and once a keyway's patent runs out, blanks from other makers can appear. When you compare systems, ask how old the keyway's patent is.
Pick and bump resistance
A standard pin tumbler cylinder has one row of pins and one way to line them up. High-security designs add a second locking element that must also be satisfied before the plug turns: a sidebar, pins that have to rotate as well as lift (Medeco is the best-known example), pins inside pins (Mul-T-Lock's telescoping design), or rotating discs and sliders (ASSA and Abloy work this way). A bump key, a cut-down key that jolts the pins of many ordinary cylinders into place, is largely defeated by these designs.
Drill and force resistance
Hardened steel inserts or pins sit in front of the plug and across the shear line, so a drill bit skates or breaks. A hardened collar or guard plate stops the cylinder from being wrenched, pried or pulled out of the door.
Standards worth asking about
UL 437 is the test standard for high-security key locks. A lab attacks the cylinder with picking, impressioning, drilling, pulling and other forced methods for set periods. A cylinder listed to UL 437 has passed. If a product calls itself high-security, ask whether it is listed.
ANSI/BHMA A156.30 is a separate standard that grades high-security cylinders.
ANSI/BHMA grades for deadbolts run from Grade 3 to Grade 1, with Grade 1 the strongest and longest-lasting. This rates the deadbolt body, not the key. A UL 437 cylinder inside a light Grade 3 deadbolt is only half the job.
Why it matters in a Scarsdale house
Scarsdale is mostly large single-family houses, in Fox Meadow, Heathcote, Quaker Ridge and the streets around the Tudor-style village centre. Big houses have more doors and, more to the point, more people with keys.
Think about a typical household over ten years: a cleaner, a nanny or babysitter, a dog walker, a contractor crew during a kitchen renovation, the pool service, a relative who stayed for a month, a neighbour who fed the cat. Every one of them held an ordinary key that any hardware store could copy. Nobody knows how many keys to the front door now exist.
That is the problem high-security locks actually solve. Burglars rarely pick locks. Former key holders and their copies are a quieter risk, and it is the one most houses never close.
Which doors deserve a high-security cylinder
The front door. It is the door everyone has a key to, so it is the first one to put on a controlled key.
The door from an attached garage into the house. Garage door remotes get taken from parked cars, and keypad codes get shared with contractors. Once someone is inside the garage, out of sight, the house door is often the weakest point in the building.
The everyday door. In many houses that is a mudroom, kitchen or side door, not the front. It gets used most and gets forgotten most.
Doors out of sight of the street. A basement walk-out, a back terrace door, a door into a detached garage or pool house holding bikes and tools.
Doors that usually do not need one: interior doors, and an exterior door that is rarely used and can be secured from inside with a bolt that has no outside keyhole at all. A lock with no keyhole cannot be picked or opened with a copied key.
All the high-security cylinders in a house can be keyed alike, so the family carries one key. Most systems also allow simple master keying: the owners' key opens every door, while a key for the cleaner or dog walker opens only the side door.
The door has to keep up
A high-security cylinder does nothing against a kick if the strike plate is held on by short screws in soft trim. Check these at the same time:
- Strike plate screws at least 3 inches long, reaching into the framing behind the jamb, not just the trim.
- Bolt throw of a full inch, so the bolt sits deep in the frame.
- The door itself. A solid wood or solid-core door. On older houses, check for rot or old repairs around the lock area.
- Exposed hinge pins. On a door that swings outward, the hinge pins are on the outside. Security hinges or hinge studs stop the door from being lifted off once the pins are out.
- Glass near the lock. Sidelights and French doors let someone break a pane and reach the thumbturn. A double-cylinder deadbolt (a key on both sides) stops that, but many fire safety guides warn against one on a door you may need to leave by in a hurry. Security film on the glass, or moving the lock away from the glass, is often the better trade.
Our sibling post on smart locks for older doors covers thick doors and mortise locks, which are common in older Scarsdale houses.
High-security and smart locks
Most consumer smart locks ship with an ordinary pin tumbler backup cylinder, so the backup key is the weak point. Some models accept a replacement cylinder; many do not. If you want both a keypad and real key control, it often makes sense to split the job: a high-security deadbolt on the front door and a smart lock on the garage entry, or the reverse, depending on which door the household uses most.
Rekey or upgrade
If you have just moved in, or a key has gone missing, rekeying ordinary locks solves today's problem: the old keys stop working. It does not stop the next set of keys from being copied. A high-security upgrade solves both. If there has been a break-in, start with our post on changing locks after a break-in, which covers the police report and which doors to deal with first.
Larchmont Locksmith NY installs high-security locks on homes across Westchester. Scarsdale is just north of the Town of Mamaroneck, where two of our three technicians live. More on the village is on our Scarsdale locksmith page.
Frequently asked questions
Can a high-security lock be picked?
No mechanical lock is impossible to open, but cylinders listed to UL 437 resisted skilled picking and drilling for the full test period. In practice, burglars rarely pick locks. They kick, pry or break glass, which is why the strike plate and door matter as much as the cylinder.
Can I get copies of a high-security key at a hardware store?
Not on a restricted system, and that is the point. Copies come through the manufacturer or a dealer registered for that keyway, usually only for people on the owner's authorization record. Keep the key card or paperwork somewhere safe, because you will need it.
Do I have to replace the whole lock?
Not always. Some high-security systems offer cylinders that retrofit into common deadbolts and mortise locks, while others come only as complete deadbolts. It depends on the hardware already on the door and its condition.
Is it worth it if the house has an alarm?
They do different jobs. An alarm tells you someone got in. A high-security lock with a strong strike plate makes getting in harder, and key control means fewer people can simply walk in with a copy. Many Scarsdale houses have both.
To talk through which doors in your house deserve the upgrade, call (914) 255-6611 or use the quote form on the site.
