Most homes in San Diego shipped from the builder with Grade-3 deadbolts — the residential minimum. Grade-3 is fine for interior doors and cheap for builders to buy in volume, but on an exterior door it fails under a 2-strike impact test. A serious kick-in attempt defeats it.
Upgrading to Grade-1 or Grade-2 is one of the highest-value security upgrades a homeowner can make for under $250 per door. Here’s what the grades actually mean, which brands and models to buy, and the cheap upgrade that matters almost as much as the lock itself.
What ANSI/BHMA grades mean
The American National Standards Institute and the Builders Hardware Manufacturers Association (BHMA) test residential and commercial locks on three dimensions: durability (cycle count before failure), security (resistance to forced entry), and finish (how long the aesthetics hold up).
Grade 3 (Residential builder-grade)
- Cycle count: 200,000 operations
- Security: Survives 2 strikes from a 75-pound ram
- Where it’s appropriate: Interior closets, bedroom doors, shed locks — anywhere a forced-entry attempt is extremely unlikely
- Where it’s NOT appropriate: Exterior doors on any residence
Most builder-grade Kwikset 600-series deadbolts that ship with tract homes are Grade 3.
Grade 2 (Upgraded residential)
- Cycle count: 400,000 operations
- Security: Survives 5 strikes from a 75-pound ram
- Where it’s appropriate: Standard residential exterior doors — front, back, side
- Example brands/models: Kwikset 980/985, Schlage B250, Defiant Naples
Grade 2 is the minimum we recommend for any exterior door in San Diego. The price difference from Grade 3 is typically $30-$50 per lock.
Grade 1 (Residential maximum / light commercial)
- Cycle count: 1,000,000 operations
- Security: Survives 10 strikes from a 100-pound ram
- Where it’s appropriate: High-security residential, small commercial, vacation rentals with unknown guest access
- Example brands/models: Schlage B60/B62, Medeco Maxum, Mul-T-Lock Hercular, Kwikset Titan
Grade 1 is overkill for some residential applications and mandatory for others. A rural Julian cabin with no close neighbors benefits more from Grade 1 than a condo in a gated community.
Which Grade-1 models to buy
Not every Grade-1 lock is identical. Here are the models we actually install across San Diego:
Schlage B60 (and B62 for double-cylinder)
Price: $60-$90 for the lock, $180-$240 installed
Best for: Most residential upgrades
The Schlage B60 is the most common Grade-1 deadbolt we install. It’s reliable, widely supported (easy to rekey, duplicate keys are cheap and available), and comes in every finish. The cylinder is Schlage’s standard keyway — compatible with restricted-keyway upgrades if you ever want to lock down key duplication.
Medeco Maxum
Price: $250-$400 for the lock, $380-$500 installed
Best for: High-security applications, restricted-keyway systems, commercial grade
The Medeco Maxum is what we install on estate properties and when a customer specifically asks for pick-resistance and drill-resistance. The Medeco biaxial pin system is dramatically harder to pick than standard pin tumblers, and the restricted keyway means no hardware store can cut a duplicate key without our authorization on file.
Mul-T-Lock Hercular
Price: $280-$420 for the lock, $420-$550 installed
Best for: High-security, restricted keyways, commercial installations
Similar use case to the Medeco — restricted-keyway, drill-resistant, pick-resistant. The Mul-T-Lock ships with a hard-plated cylinder that resists drilling attacks specifically. Popular in Poway custom homes and the high-end Rancho Santa Fe / Fairbanks Ranch market.
Kwikset Titan
Price: $80-$120 for the lock, $200-$280 installed
Best for: Homeowners who want Grade 1 but prefer SmartKey rekey-by-owner
The Kwikset Titan is a Grade-1 deadbolt with Kwikset’s SmartKey technology — meaning you can rekey the lock yourself in 30 seconds with the included learn tool. Good choice for landlords and rental properties where tenants rotate frequently. Note: some older-generation SmartKey cylinders had bump vulnerabilities; Current-gen addresses this.
The strike plate is as important as the lock
Here’s the part most homeowners miss: a $300 Grade-1 deadbolt mounted with factory 3/4” screws into the door trim is barely better than a Grade-3 lock with the same screws. The deadbolt’s cylinder is protected, but the strike plate — where the bolt actually engages — can be ripped out with a single good kick to the door.
The fix is a 3-inch strike-plate screw upgrade. Instead of the short screws that come with most locks (which anchor only into the door trim), you replace them with 3-inch screws that reach through the trim and into the door’s structural framing. A proper 3-inch-screw strike plate dramatically increases the kick-in resistance of any door. The screws cost $5 for a pack of 20 — the highest security-per-dollar upgrade in homeownership.
On every deadbolt installation call, we do this upgrade by default unless the homeowner specifically declines. If a locksmith installs a new deadbolt for you without mentioning the strike plate, ask about it.
Single-cylinder vs. double-cylinder deadbolts
A single-cylinder deadbolt has a keyhole on the exterior side and a thumb-turn on the interior. You can always unlock the door from inside without a key — which means you can exit quickly in a fire or emergency. This is the California building code default for most residential applications.
A double-cylinder deadbolt has keyholes on both sides. From inside, you need a key to unlock the door. This is used when there’s glass within 40 inches of the deadbolt (because a burglar could break the glass, reach through, and turn a thumb-turn). The trade-off: in a fire, you need to know where the key is to exit.
In most San Diego homes: install single-cylinder. It’s code-compliant, fire-safer, and simpler. Only use double-cylinder if your door has glass within 40 inches of the lock.
Finishes: what to choose
The finish on your deadbolt affects how it ages. In San Diego specifically:
- Coastal homes (Coronado, Del Mar, Imperial Beach, Oceanside, Carlsbad): use brass, stainless steel, or marine-grade finishes. Anything else will pit within 5-10 years from salt air.
- Inland and desert homes (Escondido, El Cajon, Santee, Borrego): most finishes hold up fine. Choose by aesthetic.
- Mountain and backcountry homes (Julian, Pine Valley, Mount Laguna): prioritize finishes that resist cold-weather cracking. Powder-coated or solid brass are reliable.
What about smart deadbolts with ANSI ratings?
Some smart deadbolts are rated Grade 2 (Schlage Encode Plus, Yale Assure Lock 2 with deadbolt). None are currently rated Grade 1. If maximum physical security is your priority, install a traditional Grade-1 deadbolt on your front door and use a smart lock on a secondary door where convenience matters more. Many homeowners do this — Grade 1 Schlage B60 on the main entry, Yale Assure Lock 2 on the side door for the dog walker.
The realistic security upgrade plan
For a typical single-family home in San Diego:
- Upgrade front deadbolt to Grade 1 Schlage B60 — $180-$240 installed
- Upgrade back / side deadbolts to Grade 2 — $120-$180 installed per door
- Install 3-inch strike plates on every exterior door — included in the install for $5-10 in parts
- Rekey all exterior doors to keyed alike — $25-40 per cylinder
- Optionally: smart lock on the most-used door — $180-$420 installed
Total for most 2-3 exterior-door homes: $400 to $700, done in a single service call.
Ready to upgrade your deadbolts in San Diego? Swift Key San Diego installs Grade-1 and Grade-2 deadbolts from every major brand, always with reinforced strike plates. Call (858) 808-6055 for a quote — typical 2-door upgrade takes 60-90 minutes in a single visit.