There are about ten types of door locks in common residential use, and most confusion comes from mixing up two different questions: what the hardware looks like on the door, and how much force it actually resists. A knob set and a deadbolt can sit on the same door doing entirely different jobs. A mortise lock and a cylindrical lock can look similar from three feet away and be fitted in completely different ways.
This is a working survey of what you will actually encounter on a Portland home, what each is good for, and the ones that should never be the only thing securing an exterior door.
Knob locks
The lock is inside the doorknob itself. Extremely common, cheap, and the weakest category in general use, because the knob can be attacked directly and the latch is a short spring bolt rather than a solid bolt.
Fine on an interior door. A knob set should never be the only lock on an exterior door. If yours is, that is the single most worthwhile thing on this page to change.
Lever handles
Mechanically similar to a knob but operated by a lever, which is far easier to use with reduced grip strength, full hands or a mobility aid. That accessibility is the reason they dominate commercial buildings and are increasingly chosen at home.
The trade-off is that a lever gives leverage. Cheap ones can be forced downward, and they catch on clothing and bags. Reversible levers matter if the door swings the other way.
Deadbolts
The workhorse of residential security. A solid bolt, thrown by key or thumbturn, that extends into the frame with no spring. A one-inch throw is the figure to look for.
Single cylinder has a key outside and a thumbturn inside, and is what belongs on almost every home. Double cylinder needs a key on both sides, which prevents a reach-through where glazing sits beside the door and, critically, also prevents your family leaving in a fire without finding a key. Fire safety guidance consistently requires exit without a key, and many jurisdictions restrict double cylinders on egress doors for that reason.
Mortise locks
The whole mechanism lives in a rectangular pocket cut into the door edge, combining latch and deadbolt in one substantial case. Portland has an unusual number of them, because a great deal of the inner eastside housing stock predates the bored cylinder becoming standard.
A well-made period mortise case is genuinely better engineering than most modern residential hardware. The weak point is the cylinder screwed into it, which on a century-old lock is not comparable to a current one. The good news is that the two are independent, so a modern cylinder can go into the original case without changing the door’s appearance.
Cylindrical and tubular locks
These describe how the lock is fitted rather than how it works. Both go through a round bore in the door face, which is why almost all modern residential hardware is one of the two and why replacement is straightforward.
Cylindrical is the heavier, more robust arrangement found in commercial-grade hardware. Tubular is the lighter residential version. The distinction matters when you are matching replacement hardware to an existing door.
Euro profile cylinders
Common on uPVC and composite doors, including the newer builds and ADU conversions appearing across Portland. The cylinder is a standardised shape held by a single screw, which makes replacement genuinely easy.
It also introduces a specific vulnerability: a cylinder that protrudes past the handle escutcheon can be snapped. Anti-snap cylinders with sacrificial break-off sections solve it, and correct measurement so the cylinder sits flush is half the answer. If you have a uPVC door, this is the thing to check.
Multi-point locks
Common on patio, French and newer fibreglass entry doors. Lifting the handle throws hooks and bolts at several points up and down the frame, then the key locks them in place.
Force resistance is considerably better than a single deadbolt because the load is spread. The usual failure is the gearbox inside, and a stiff multi-point is almost always an alignment problem first, particularly on a Portland door that swells through eight wet months.
Rim locks and surface-mounted bolts
Fitted to the face of the door rather than into its edge. Night latches, surface bolts and period rim locks all fall here. Useful as a secondary layer, easy to retrofit, and dependent entirely on the screws holding the case to the door.
Warded and bit-key locks
The antique category, with a large keyhole and a skeleton-style key. Genuinely charming and essentially a privacy device rather than a security one, because the mechanism has no pins and a handful of key shapes open most of them. Perfectly adequate on an interior bedroom or study door in an older home.
Electronic and smart locks
Keypad, fingerprint or app-operated, sitting on top of a mechanical deadbolt underneath. The connection type decides remote capability and battery life, but the grade of the deadbolt underneath decides how much force the door resists.
A smart lock with a Grade 3 deadbolt underneath is a Grade 3 deadbolt with an app. Grading and testing from bodies such as UL is what makes that comparable between products.
Choosing for a Portland door
- Front and back doors: a graded single cylinder deadbolt plus a keyed entry set, with reinforced strikes.
- uPVC or composite doors: an anti-snap euro cylinder, correctly measured.
- Patio and French doors: multi-point where fitted, plus a secondary foot bolt or pin lock.
- Interior doors in an older home: keep the original warded hardware and service it.
- A rented room or ADU: non-destructive additions that come off without a trace.
- Anyone with grip or mobility difficulty: levers and keypad entry rather than small knobs and keys.
The thing none of them fixes
Whichever type you choose, it is fastened into a frame. Most forced entries split the jamb rather than defeating the mechanism, so long screws into the framing and a reinforced box strike do more than upgrading a category on this list.
Pick the type for how the door is used, then spend the rest of the budget on the frame. Professional standards from ALOA cover the training behind matching hardware to an opening properly.
If you are not certain what is on your doors or whether it suits the job, our residential locksmith services and wider locksmith services cover assessment and replacement across Portland. Call 971-257-4730 and describe the door rather than the symptom.
