Keeping your home secure starts with something as simple yet essential as choosing the right lock. In Singapore, where high-rise apartments, HDB flats, and landed properties each have unique security needs, homeowners often wonder: should I rely on a knob lock, or is a deadbolt a safer choice? Many burglaries happen because doors are fitted with weak or improperly installed locks. This guide explains the real differences between a deadbolt and a knob lock, which option gives better protection, and why this choice matters for your family’s safety and peace of mind. If your door security setup feels uncertain, the professional locksmiths at Locksmith Singapore can inspect and upgrade your locks to industry standards.
What Is a Deadbolt?
A deadbolt is a locking mechanism that uses a solid metal bolt extending directly into the door frame. Unlike spring-latch locks, a deadbolt does not rely on a spring; it must be locked and unlocked manually using a key or thumb turn. This makes it harder to force open or slip with a card.
Types and Variations of Deadbolt Locks
Deadbolt locks come in several types, each suited for different security needs:
- Single-Cylinder Deadbolt: This type has a keyhole on the outside and a thumb turn on the inside, making it easy to lock or unlock from inside without a key. It’s ideal for doors without windows nearby, as it reduces the risk of an intruder breaking glass and reaching the thumb turn.
- Double-Cylinder Deadbolt: Requires a key on both sides, providing better security for doors with glass panels. While this enhances protection, it’s important to weigh the safety concern during emergencies because it can be harder to unlock quickly from the inside.
- Lockable Thumbturn Deadbolt: Combines the convenience of a thumb turn with a key lock, allowing it to be locked or unlocked from the inside with a key when extra security is desired.
- Smart Deadbolts: These are modern options that offer keyless entry using codes, biometrics, or smartphone apps. They provide good security and ease of use, increasingly popular in Singapore’s smart home market.
Choosing the right type depends on your home’s design and your specific security concerns. Professional locksmiths in Singapore like those at locksmith singapore can assess your needs and recommend the best deadbolt style
What Is a Knob Lock (Key-in-Knob)?
A knob lock, also known as a key-in-knob lock, is built into the door handle itself. The locking mechanism sits inside the knob, and it uses a spring-loaded latch that fits into the strike plate on the door frame. These locks are easy to install and commonly found on bedroom or bathroom doors.
However, knob locks are not recommended as the primary security lock for external doors. Because the lock cylinder is located within the handle, it can be easily forced, twisted, or bypassed using simple tools. They are convenient for quick access but weak against brute-force attacks.
Types and Variations of Knob Locks
Knob locks have a few variations but generally provide less security for exterior doors:
- Keyed Entry Knob Lock: This locks from the outside with a key and on the inside with a twist or button. It’s commonly used for exterior doors but should not be relied on alone for security.
- Passage Knob Lock: This type doesn’t lock and is mainly for interior doors like hallway or closet doors.
- Privacy Knob Lock: Designed for interior rooms such as bathrooms or bedrooms, allowing locking from the inside.
Because the locking mechanism is inside the knob itself, knob locks are easier to force open and are vulnerable to lock picking or credit-card bypassing. In Singapore’s context, combining knob locks with a deadbolt is advised for exterior doors to prevent easy break-ins.
Mechanisms and Vulnerabilities: How They Compare
Mechanical Advantage of Deadbolts
Deadbolts offer stronger resistance because their bolt extends fully into the door frame. Once locked, the bolt cannot be pushed back without rotating the cylinder. This makes it far more secure against prying, kicking, or using a thin object to slide the latch.
A properly installed deadbolt should extend at least one inch into the strike plate, and the plate itself should be reinforced with 3-inch screws anchored into the wall stud. Even if an intruder tries to force the door, this configuration holds firm.
Smart and electronic deadbolts available in Singapore also use motorized bolts that automatically lock when you close the door, a useful safety feature for busy households.
Weaknesses of Knob Locks
Knob locks rely on a spring-latch mechanism, which can easily be retracted with minimal force or a thin object. The knob’s design also exposes the cylinder to direct attack. With a wrench or brute force, the entire knob can twist off, leaving the latch vulnerable.
Common issues with knob locks include:
- Latch manipulation: A credit card or shim can push the spring latch open.
- Force attacks: Weak knobs can break or deform under strong impact.
- Cylinder exposure: Since it’s inside the knob, it’s easier to grip and twist.
- Wear and tear: The mechanism loosens over time with frequent use.
Because of these vulnerabilities, most locksmiths in Singapore advise using a deadbolt as the main lock for any exterior door, while a knob lock can serve as a secondary latch.
Comparative Analysis: Deadbolt vs Knob Lock
Below is a direct comparison showing how both lock types differ in key areas:
| Feature | Deadbolt | Knob Lock |
| Security Level | High – resists forced entry, prying, and latch slipping | Low – vulnerable to picking, bumping, and brute force |
| Mechanism Type | Solid bolt locking into frame, manual or electronic | Spring latch within the handle |
| Durability | Long-lasting, less wear | Loosens with frequent use |
| Installation Difficulty | Moderate – requires proper drilling and alignment | Easy – fits within standard door holes |
| Maintenance | Occasional lubrication and alignment check | Frequent due to moving parts |
| Best Use | Exterior doors, main gates, high-security areas | Interior rooms, low-risk doors |
The table shows why deadbolts remain the first choice for homeowners who value real protection. Knob locks still have their place for convenience, but they should never be your only line of defense.
If your current setup relies solely on knob locks, upgrading to a deadbolt is a simple step that dramatically improves your home’s safety. Our specialists at Locksmith Singapore can recommend and install the right deadbolt suited for your door’s design and thickness.
Cost, Installation, and Maintenance Considerations
Cost Comparison
In Singapore, the price of a standard mechanical deadbolt starts around $50–$120, while smart deadbolts range between $180 and $400, depending on features and brand. Knob locks are cheaper, averaging $25–$60, but they provide far less protection and need more frequent replacement.
Installation and Fit-Out Factors
Installing a deadbolt correctly requires precise alignment with the strike plate. The installer must measure the backset (distance from door edge to handle hole) and ensure the bolt fully extends into the doorframe. A professional locksmith can also reinforce the strike plate with longer screws and metal inserts for extra strength.
Knob locks are easier to install; most fit into pre-bored door holes, but that ease comes at the expense of security. Homeowners who attempt DIY installation of deadbolts sometimes misalign the bolt, which weakens its hold. Getting a qualified locksmith from Locksmith Singapore ensures the lock functions perfectly and meets safety standards.
Maintenance and Lifespan
Deadbolts typically last 10–15 years with minimal maintenance. You only need to lubricate the bolt annually and check that the screws remain tight. Knob locks tend to loosen or jam sooner because of their internal springs and moving handles.
To maintain performance:
- Use graphite or silicone lubricant, not oil.
- Ensure the doorframe remains solid and unwarped.
- Replace damaged or corroded screws immediately.
- For smart deadbolts, replace batteries every 6–12 months.
Deadbolt Locks: Pros and Cons
Pros of Deadbolt Locks
- Superior Security
Deadbolts are known for offering superior security compared to other locks. Their solid metal bolt makes it harder for intruders to force their way in. They provide robust protection against forced entry, tampering, and picking, making them the best choice for exterior doors.
- Durable and Long-Lasting
Deadbolts are typically made from strong materials like steel, which makes them highly durable. They can withstand harsh weather and frequent use without degrading, making them an ideal choice for outdoor doors.
- Resistance to Forced Entry
Deadbolts are designed to resist forceful attacks. The mechanism is built to withstand kicking, prying, or twisting, which makes it incredibly difficult for burglars to break in, especially in high-risk areas like the front door.
Cons of Deadbolt Locks
- Inconvenience for Quick Access
Deadbolts can be slightly inconvenient if you need quick access to your home, as they require either a key or thumb turn to operate. For people who are in a rush or have hands full, manually locking and unlocking a deadbolt can be a hassle.
- Costly Installation
Compared to knob locks, deadbolts are generally more expensive, both in terms of product cost and installation fees. Some high-security deadbolts require professional installation to ensure they’re properly fitted and aligned, adding to the overall cost.
- Possible Emergency Risks
Double-cylinder deadbolts can pose a safety risk in an emergency, as they require a key to open from the inside. This can slow down escape in case of fire or other urgent situations.
Knob Locks: Pros and Cons
Pros of Knob Locks
- Ease of Use
Knob locks are very easy to operate. With a simple twist of the knob, you can unlock or lock the door, making them ideal for interior doors where quick access is a priority. They are simple for anyone to use, including children or elderly family members.
- Cost-Effective
Knob locks are generally much more affordable than deadbolts. If you’re looking for a budget-friendly option, knob locks are a great choice. The installation process is also less expensive since knob locks are easier to install.
- Quick Installation
Since knob locks have a simpler mechanism, they are much easier to install than deadbolts, making them ideal for DIY installations.Their simplicity allows for quick setup, saving time compared to deadbolts that often require professional installation.
- Variety of Designs
Knob locks come in a wide range of designs, making them an attractive option for homeowners looking for a stylish, yet functional, lock for interior doors. They are available in a variety of finishes, such as brushed nickel, bronze, and chrome, to match your home decor.
Cons of Knob Locks
- Lower Security
Knob locks are much easier to tamper with or bypass than deadbolts. Their spring-loaded mechanism is susceptible to lock picking or manipulation, making them unsuitable for exterior doors. Knob locks offer minimal resistance against forced entry, meaning they can be easily pried open with tools like screwdrivers or wrenches.
- Vulnerability to Forced Entry
Physical attacks, such as kicking in the door or twisting the knob with tools, are commn ways intruders break into homes with knob locks. They are often the first point of entry for burglars because of their weak resistance to force.
- Durability Issues
Knob locks are typically made from lighter materials, making them less durable than deadbolts. They may show wear and tear much more quickly, especially if used on high-traffic doors. Over time, the internal mechanism of a knob lock can fail, causing the lock to malfunction or become difficult to turn.
- Limited Security Features
Unlike deadbolts, knob locks typically do not have additional features for enhanced security, such as anti-pick or anti-bump technologies. This makes them much easier to bypass or compromise.
Factors to Consider When Choosing a Lock
When choosing the right lock for your home, several important factors should be considered to ensure both security and convenience. Here are the key points to keep in mind when deciding between a deadbolt or knob lock for your doors.
Security Needs
The most important factor in choosing a lock is security. If your goal is to protect the home from forced entry, a deadbolt is the clear choice. Deadbolts offer significantly stronger protection and are highly resistant to tampering. If you’re concerned about security in areas like the front or back door, a deadbolt should be your primary lock. Knob locks, on the other hand, should be used as secondary security measures for areas that are less vulnerable to break-ins.
Type of Door and Location
Consider the type of door and its location in your home. Exterior doors, especially those leading to the main entrance, should always be equipped with a deadbolt for maximum protection. Interior doors or less critical access points, such as bathrooms or bedrooms, can comfortably use knob locks. If you live in a high-crime area, upgrading to a deadbolt for every external door will provide peace of mind.
Budget Considerations
Cost is often a deciding factor in lock selection. Knob locks are more affordable compared to deadbolts and are a good option for homeowners on a budget. If you’re looking to secure several rooms inside your home, knob locks are a cost-effective solution. However, if security is a higher priority, especially for exterior doors, it’s worth investing in a quality deadbolt despite its higher price.
Durability and Maintenance
The durability of the lock is also an important consideration. Deadbolts are typically more durable than knob locks, especially in harsh weather conditions or with frequent use. If you’re installing a lock on an exterior door, opt for a weather-resistant deadbolt to ensure long-term reliability. Knob locks are more prone to wear and tear and may need replacement sooner than deadbolts, especially on exterior doors.
Aesthetic Preferences
While security is the primary concern, aesthetic considerations should also play a role, especially for interior doors. Knob locks come in a wide variety of styles and finishes, which makes them a great option for complementing your home’s interior design. Deadbolts, while practical, may not always match the aesthetic look of your home, especially if they’re used in places where style matters.
Emergency Access
For emergency situations, it’s important to choose a lock that doesn’t hinder quick exit. Deadbolts, especially double-cylinder models, can delay escape in emergencies like fires. Knob locks, while not as secure, do allow for quicker access and are easier to unlock from the inside without a key. If emergency access is crucial for your home, consider avoiding double-cylinder deadbolts.
Which One is Better for Your Home?
For your home, a deadbolt is the better option for main entrance doors due to its superior security and resistance to forced entry. It provides strong protection against burglars, making it ideal for exterior doors. However, knob locks are suitable for interior doors or secondary entrances where convenience is more important than high security. For the best protection, consider using both: a deadbolt for your exterior doors and a knob lock for interior doors, ensuring a balance of security and ease of access.
FAQs
1. Which is more secure: a deadbolt or a knob lock?
A deadbolt is much more secure than a knob lock. Deadbolts are designed to resist forced entry and tampering, offering superior protection for exterior doors. Knob locks are more vulnerable and can be easily bypassed with basic tools, making them unsuitable for high-risk areas like the front door.
2. Can I use a deadbolt and a knob lock together?
Yes, combining a deadbolt with a knob lock is an effective way to enhance your home security. The deadbolt serves as the primary lock for protection, while the knob lock offers additional convenience for secondary access. This combination creates layered security for your doors.
3. Where should I install a deadbolt lock?
Deadbolts should be installed on all exterior doors, especially main entrance doors like the front and back doors. They provide strong resistance to forced entry, making them ideal for securing the most vulnerable access points of your home.
4. Can knob locks be used on exterior doors?
While knob locks can technically be used on exterior doors, they are not recommended as the primary lock due to their low security. Knob locks are better suited for interior doors where security isn’t as critical. For exterior doors, it’s best to use a deadbolt.
5. How long do deadbolt and knob locks last?
Deadbolt locks are generally more durable than knob locks, as they are made from stronger materials and designed to withstand more wear and tear. With proper maintenance, a deadbolt can last many years, especially if it’s made from high-quality materials. Knob locks, however, may need replacing sooner, particularly if exposed to harsh weather or frequent use.