The Ultimate Door Knob Buying Guide (2025) | Expert Tips from Zonle Doors

Welcome to Zonle Doors, your trusted source for premium-quality door hardware that blends security with design. Though often overlooked, door knobs play a vital role in safeguarding your home, protecting privacy, and complementing the interior style of your space. This guide explores the various types of door knobs, their uses, and the key factors to keep in mind when selecting the right one.

Whether you're upgrading your entryway for enhanced protection or refreshing the look of your bedroom, choosing the correct door knob ensures both functionality and aesthetics. With the right knowledge, it's much easier to find a knob, lever, or handle that perfectly matches your needs and taste.

Main Types of Door Knobs and Handles

Before you purchase, it’s important to identify the type of door knob you need. Broadly speaking, knobs fall into two major categories:

• Interior door knobs – designed for rooms within the home.

• Exterior door knobs – built to secure entryways against unwanted access.

Within each group, there are several specific subtypes tailored for different purposes.

Interior Door Knobs

Interior knobs are intended for bedrooms, bathrooms, closets, and utility rooms. Different settings call for different designs:

• Privacy Knob
  Best suited for bedrooms and bathrooms, these knobs come with built-in locks to prevent accidental intrusions. They don’t use keys, so while they provide household privacy, they are not secure enough for exterior use.

• Passage Knob
  Ideal for hallways or closets where no lock is required. They allow smooth passage but do not provide any privacy feature.

• Dummy Knob
  Often decorative, dummy knobs don’t turn or latch. They’re commonly used on cabinets or double doors where only a pull is needed.

Exterior Door Knobs

Exterior knobs serve as the first line of defense for your home and must combine durability with strong locking mechanisms. The two most common types include:

• Keyed Entry Knob
  These traditional knobs require a key to lock or unlock from the outside. Many come paired with deadbolts to enhance security.

• Keyless Entry Knob
  A modern solution that uses digital codes or smart technology. Convenient for families or individuals prone to misplacing keys, they offer secure, key-free access.

Essential Factors to Consider When Buying a Door Knob

When choosing a door knob, it’s not only about type—several additional factors play into making the right decision:

1. Security Ratings (ANSI Standards)

Safety is paramount, especially for entry doors. Door hardware in the U.S. is typically tested and certified by the American National Standards Institute (ANSI):

• Grade 1 – Highest level of security, often used in commercial buildings.

• Grade 2 – Reliable for most residential applications.

• Grade 3 – Basic level of protection, suitable for interior doors.

For peace of mind, opt for knobs with at least Grade 2 or higher for exterior doors.

2. Privacy Needs

Interior knobs contribute to everyday comfort by providing privacy where needed. Bathrooms and bedrooms benefit from lockable knobs, while communal areas like hallways may only need passage knobs. Choosing the right privacy level creates a more harmonious living environment.

3. Cost and Budget Range

Door knobs can cost anywhere from under $5 to over $500 depending on materials and design. Most homeowners find quality options in the $10–$100 range, balancing affordability with durability. If you value premium finishes or advanced features like smart locks, be prepared for higher pricing.

4. Locking Mechanism Preferences

• Interior Knobs: Usually feature push-button or thumb-turn locks, often with emergency release options for safety.
• Exterior Knobs: Choose between traditional keyed locks or modern keyless systems.

5. Accurate Measurements

To ensure a proper fit, measure before purchasing:

• Backset: Distance from door edge to knob center (commonly 2⅜" or 2¾").

• Cross Bore: The main hole where the knob is installed (usually 2⅛").

• Door Thickness: Typically between 1¼" and 3"; exterior doors are thicker.

Taking correct measurements upfront prevents mismatches and installation issues.

6. Ease of Installation

Most knobs are designed for DIY-friendly installation. Still, user reviews often reveal how straightforward the process really is. Check feedback before buying if you’re new to home projects.

7. User-Friendliness

Knobs should be accessible for everyone in your household. Lever-style handles, for instance, are more comfortable for people with arthritis than traditional round knobs. For entryways, some people prefer memorizing a code instead of carrying keys—choose what suits your lifestyle best.

8. Style, Shape & Finish

Door knobs can significantly influence your home’s aesthetics. Options range from classic round knobs to egg-shaped, tulip, or octagonal designs, available in finishes such as polished brass, matte black, stainless steel, or even decorative patterns. If you’re aiming for a cohesive look, coordinate the knob design with your home’s overall style.

Why Choose Zonle Doors?

At Zonle Doors , we specialize in manufacturing high-quality door knobs and hardware that blend reliability, functionality, and visual appeal. From affordable interior knobs to premium exterior security solutions, our products are designed with homeowners in mind.

By selecting our hardware, you’re choosing durable craftsmanship, stylish designs, and dependable performance—all from a company dedicated to enhancing the safety and comfort of your living space.

Final Thoughts

A doorknob may seem like a small purchase, but it has a big impact on your home’s security, privacy, and design harmony. With the right type, correct measurements, and features that match your needs, you’ll find a knob that offers peace of mind and enhances your décor.

Whether you prefer a traditional keyed entry knob or embrace the convenience of a modern keyless system, there’s a wide variety of options available. With this guide, you’re now better equipped to make an informed decision—and to choose a product that truly elevates both safety and style.