Upgrade Your Home Security: Professional Lock Change and Replacement
Q 24/7 Lock Service offers comprehensive lock change and replacement for residential properties throughout Maryland, Baltimore, and Washington DC. Whether your existing hardware is worn, damaged, or simply not secure enough, our mobile locksmiths provide new deadbolts, knobs, and levers precisely fitted to your door.
From $120 · typical arrival same day
24/7 dispatch
A person answers, any hour
Licensed & insured
Background-checked techs
Since 2009
15+ years in the DMV
Mobile vans
Stocked to finish on visit one
New hardware, correctly fitted to the door you actually have.
Full replacement of deadbolts, knobs, levers, mortise bodies and storefront cylinders when the existing hardware is worn, damaged, outdated or simply not secure enough.
Most failed locks are not failed locks — they are misaligned doors, worn strikes or a hollow jamb with 3/4-inch screws in it. We check the strike, the gap and the frame before fitting anything, because a Grade 1 deadbolt in a soft jamb is still a kick-in. Hardware is matched to your finish and, when you want it, keyed to your existing key.
Our Approach to Secure Lock Replacement
When you need to change locks, our service goes beyond simply installing new hardware. Many apparent lock failures stem from door misalignment, worn strike plates, or a weak jamb. Before fitting any new deadbolt or lock, we thoroughly inspect the door's current condition, including the strike, the gap between the door and frame, and the frame itself. A high-security lock offers little protection if the door frame cannot withstand an impact.
Our technicians ensure that any underlying issues are addressed, as a Grade 1 deadbolt in a compromised jamb will still fail under force. We select hardware that matches your existing finish and, upon request, can key new locks to your current house key for convenience. This meticulous approach guarantees that your new lock functions correctly and provides the intended level of security, protecting your home effectively.
Understanding Lock Replacement Costs
The starting price for a lock replacement is $120, in addition to our standard $49 service call fee. This initial cost covers a basic lock change, but the total price can vary based on several factors. These include the type of lock you choose, such as a standard knob, lever, or a high-security deadbolt, and its grade. Grade 1 and Grade 2 commercial-rated hardware, which offers enhanced durability and resistance to forced entry, will typically incur a higher cost.
Additional factors influencing the final price might include necessary door or frame modifications, replacement of specialized hardware like mortise lock bodies, or the integration of specific finishes to match your home's aesthetic. Our technicians provide a detailed quote before any work begins, ensuring you understand all costs involved. You will know the exact price and agree to it before the replacement process starts, with no hidden fees.
Common Mistakes in Lock Replacement
One common misconception is that all lock replacements are simple DIY tasks. While some homeowners can manage basic installations, improper fitting can lead to premature wear, operational issues, or reduced security effectiveness. Another mistake is only replacing the lock cylinder without addressing the surrounding hardware or the door's structural integrity. A new cylinder in a loose or worn lock body will not provide reliable security.
Homeowners often overlook the importance of the strike plate and door jamb. Installing a top-tier deadbolt into a hollow or weak door frame secured with short screws creates a vulnerable point that can be easily breached. We emphasize that a secure lock system is only as strong as its weakest component. Our service ensures a comprehensive assessment and robust installation, avoiding these common pitfalls to provide lasting security.
Lock Replacement in MD, DC, and Baltimore Homes
The diverse architecture across Maryland, Washington DC, and Baltimore presents unique considerations for residential lock replacement. From the historic rowhouses of Baltimore with their specific mortise lock requirements to the garden apartments and suburban homes with various door types, each property requires a tailored approach. Many older homes in the region may have non-standard bore sizes or unique door thicknesses that demand specialized attention to ensure proper fit and function.
For residents in and around the nation's capital, security needs are often influenced by the urban environment and the general desire for enhanced protection. Whether you are upgrading a lock on a multi-family unit or a single-family home, our expertise covers a wide range of hardware and installation scenarios specific to this region. We understand these local nuances, providing effective solutions for every property type in Maryland, DC, and Baltimore.
What's included
- Deadbolt, knob and lever replacement
- Grade 1 and Grade 2 commercial-rated hardware
- Mortise lock body replacement
- Strike plate and jamb reinforcement
- Keyed alike to your existing key on request
Call us when
- The key has to be jiggled to turn
- The lock is loose in the door
- The hardware came with the house and is decades old
- You want a higher security grade after a break-in on the block
What this costs
A $49 service call brings a licensed technician and a stocked van to you; lock change starts at $120 on top of that and is quoted in full before dispatch.
Residential
- House lockoutfrom $65
- Lock re-keyfrom $99
- Lock changefrom $120
- New lock installationfrom $80
Automotive
- Car lockoutfrom $65
- Lock re-keyfrom $120
- Lock changefrom $165
- New lock installationfrom $145
Commercial
- Business / office lockoutfrom $95
- Lock re-keyfrom $135
- Lock changefrom $170
- New lock installationfrom $80
Lock Change where you are
We cover 121 communities across Maryland, Baltimore and Washington DC for this service.
Pick your area
- Accokeek, MD
- Adams Morgan, Washington DC
- Annapolis, MD
- Arboretum, Washington DC
- Arbutus, MD
- Arnold, MD
- Baltimore, MD
- Beallsville, MD
- Bel Air, MD
- Beltsville, MD
- Berwyn Heights, MD
- Bethesda, MD
- Bladensburg, MD
- Bloomingdale, Washington DC
- Bowie, MD
- Boyds, MD
- Brandywine, MD
- Brentwood, Washington DC
- Brightwood, Washington DC
- Bristol, MD
- Brooklyn Park, MD
- Bryans Road, MD
- Burtonsville, MD
- Cabin John, MD
- Camp Springs, MD
- Carney, MD
- Catonsville, MD
- Chevy Chase, MD
- Clarksburg, MD
- Clarksville, MD
- Clinton, MD
- Cockeysville, MD
- College Park, MD
- Colonial Village, Washington DC
- Columbia Heights, Washington DC
- Columbia, MD
- Crofton, MD
- Crownsville, MD
- Damascus, MD
- Davidsonville, MD
- Derwood, MD
- Dickerson, MD
- District Heights, MD
- Dorsey, MD
- Dundalk, MD
- Dunkirk, MD
- Dupont Circle, Washington DC
- Edgewater, MD
- Edgewood, Washington DC
- Elkridge, MD
- Ellicott City, MD
- Essex, MD
- Ferndale, MD
- Fort Lincoln, Washington DC
- Fort Meade, MD
- Fort Washington, MD
- Frederick, MD
- Gaithersburg, MD
- Gambrills, MD
- Germantown, MD
- Glen Burnie, MD
- Glen Echo, MD
- Glenarden, MD
- Greenbelt, MD
- Hanover, MD
- Highland, MD
- Hyattsville, MD
- Jessup, MD
- Kensington, MD
- Kettering, MD
- La Plata, MD
- Landover Hills, MD
- Landover, MD
- Lanham, MD
- Lansdowne, MD
- Laurel, MD
- Linthicum Heights, MD
- Lochearn, MD
- Logan Circle, Washington DC
- Lothian, MD
- Lutherville Timonium, MD
- Massachusetts Heights, Washington DC
- Middle River, MD
- Milford Mill, MD
- Millersville, MD
- Mount Rainier, MD
- National Harbor, MD
- New Carrollton, MD
- North Bethesda, MD
- North Potomac, MD
- Odenton, MD
- Olney, MD
- Overlea, MD
- Owings, MD
- Owings Mills, MD
- Oxon Hill, MD
- Parkville, MD
- Pasadena, MD
- Perry Hall, MD
- Pikesville, MD
- Poolesville, MD
- Potomac Heights, Washington DC
- Randallstown, MD
- Reisterstown, MD
- Riverdale, MD
- Rockville, MD
- Rosedale, MD
- Rossville, MD
- Severn, MD
- Severna Park, MD
- Silver Spring, MD
- Spencerville, MD
- Takoma, Washington DC
- Takoma Park, MD
- Towson, MD
- U Street, Washington DC
- Upper Marlboro, MD
- Waldorf, MD
- Wheaton, MD
- White Marsh, MD
- Woodlawn, MD
What our customers actually say
Real reviews from Google and Yelp, published exactly as our customers wrote them.
“When we moved into our new place, we called Chaim to rekey the locks. He was quick, professional, and very helpful. He also adjusted the doors, and they now close and lock more smoothly. Highly recommend using Q 24/7.”
Dan Granot
Lock rekey
“I called and had my 3 month old and 2 year old locked inside my condo. He arrived extremely fast and tried multiple ways to open the door. He successfully opened my door within 15 minutes promptly. Amazing service and very friendly. Would recommend for any emergency!!!!!”
Zoeys Mommy
Emergency house lockout
“Hay was extremely professional and very courteous. He did an outstanding job replacing 2 locks and re-keying one lock for me. Hay took the time to explain what needed to be done and why. I would absolutely use this company again. And their prices were very reasonable.”
Joycelyn McAllister Monayong
Lock change + rekey
Find us
8405 Greenbelt Rd #201
Greenbelt, MD 20770
We're a mobile locksmith — the van comes to you. The Greenbelt address is our dispatch base, and it's where the Maryland, Baltimore & Washington DC coverage radiates from.
Lock Change & Replacement — questions
Still not sure? Call (888) 571-4443 — a real dispatcher will tell you what the job involves before anyone is sent out.
How much does it cost to change a residential lock?
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Our lock replacement service starts at $120, plus a $49 service call fee. The final price can vary depending on the type of lock, its security grade, and any necessary door modifications. We provide a clear quote for your approval before starting any work.
Can you replace just the cylinder in my existing lock?
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Yes, in many cases, we can replace just the cylinder. This is often done if your lock body is still in good condition, but you need to change the key. However, if the entire lock mechanism is worn or damaged, a full replacement is recommended for optimal security and function.
What if my door frame is damaged or weak?
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If your door frame is damaged or weak, we can provide solutions such as strike plate and jamb reinforcement. Installing a new lock into a compromised frame offers limited security. Our technicians assess the entire door system to ensure your new lock is as secure as possible.
How quickly can Q 24/7 Lock Service replace my locks?
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We typically offer same-day service for lock changes and replacements. Our live dispatcher is available 24/7 Sunday through Thursday and Saturday, and Friday 9:00 AM to 5:30 PM, to schedule a technician dispatch to your Maryland, DC, or Baltimore location promptly.
Can you match new locks to my existing house key?
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Yes, we can often key new locks to your existing key, provided the new hardware is compatible with your current keyway. This service helps you maintain convenience by reducing the number of keys you need to carry for your home.
What payment methods do you accept for lock replacement services?
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For your convenience, Q 24/7 Lock Service accepts various payment methods. You can pay with cash, Visa, Mastercard, American Express, Apple Pay, Zelle, and Venmo once the service is completed to your satisfaction.
Need lock change?
One call reaches a live dispatcher, 24 hours a day. Upfront price before a van moves.