Emergency Locksmith
Locked out of your house, business, or car? Our mobile locksmiths bring the right tools to unlock your door safely, handle broken key removal, or replace damaged locks on site.
Emergency Services:
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Residential
Residential locksmith services
House lockout
Indoor lockout
House lock rekeying
Smart lock installationCommercial
Commercial locksmith services
Business lockout
Business lock rekey
Safe lockoutAutomotive
Automotive locksmith services
Car lockout
Car key replacement
Ignition replacementEmergency
Emergency locksmith (24/7)
House emergency
Business emergency
Automotive emergencyService Areas
All service areas
Silver Spring, MD
Greenbelt, MD
Rockville, MD
Bethesda, MDMore Links
Our Work
About Us
Contact Us
BBB A+ ACCREDITED • MARYLAND LICENSE #507 • GREENBELT, MD
The Best Locksmith
The Best Locksmith
in the DMV with the
Best Reviews.
Reliable mobile locksmith service for your car, home, and business. Fair prices, honest quotes, and quality work you can count on.
Mobile Locksmiths Serving Maryland, Washington, D.C. & NoVA
Mobile Lock & Key Services
Our Locksmith Services
We provide dependable mobile locksmith services for homes, businesses, and cars across Greenbelt and Central Maryland.
Residential Locksmith
Keep your home safe with new deadbolt installation, house lock rekeying after moving in, door lock repair, and easy-to-use keyless keypad locks.
Home Locksmith Services:
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Commercial Locksmith
Protect your office, store, or building with heavy-duty mortise locks, master key systems, ADA lever handles, panic exit bars, door closers, and access control systems.
Commercial Locksmith Services:
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Automotive Locksmith
Get back on the road with damage-free car door unlocking, on-site car key replacement, key fob programming, and ignition repair for most domestic and foreign cars and trucks.
Auto Locksmith Services:
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Recent Projects
Our Recent Locksmith Work
See real examples of our recent locksmith projects, including lock installation, rekeying, and key programming across Maryland.
Lock Rekeying
Front Door Deadbolt Rekeying
We rekeyed this front door deadbolt and cut five new matching keys on site through our lock rekeying service.
Keypad Locks
Schlage Keypad Lock Installation
We installed a Schlage electronic keypad deadbolt on this front door for easy keyless entry.
Commercial Hardware
Commercial Exit Door Panic Bar
We installed and adjusted a heavy-duty panic push bar on a commercial steel exit door.
Office Locks
Commercial Mortise Lock & Lever
We installed a heavy-duty mortise lock and chrome lever handle on an office entry door.
Smart Locks
Yale Smart Lock on French Doors
We installed and set up a Yale touchscreen smart deadbolt on a pair of residential French doors.
Car Keys & Fobs
On-Site Car Key & Fob Programming
We cut and programmed a replacement Dodge key fob right in the customer's driveway using our mobile auto locksmith tools.
Quality Lock & Key Hardware
Lock & Key Brands We Service
We install, rekey, and repair trusted lock brands and car keys for homes, businesses, and vehicles.
Kwikset
Home Deadbolts & SmartKey Locks
Mul-T-Lock
High-Security Locks & Keys
Schlage
Home & Commercial Deadbolts & Keypads
Yale
Touchscreen Smart Locks & Deadbolts
Medeco
High-Security Commercial Cylinders
Baldwin
Solid Brass Door Handles & Deadbolts
Corbin Russwin
Heavy-Duty Office Locks & Master Keys
Adams Rite
Glass & Aluminum Storefront Door Locks
More Lock Brands We Service: ASSA ABLOY • Sargent • Arrow Lock • Defiant • Weiser • Master Lock • RR Brink • See All Lock Brands →
Car Key & Fob Brands We Service: Ford • Chevrolet • Toyota • Honda • Nissan • Hyundai • Kia • Jeep • Dodge • BMW • Volkswagen • Lexus • Mazda • Audi • GMC • Cadillac • Acura • See All Car Brands →
Why Choose Locksmith Guarantee
Honest Pricing, Licensed Locksmiths & Damage-Free Service.
Homeowners, property managers, and drivers across Greenbelt and Central Maryland count on our mobile team for clear quotes and dependable lock hardware.
Clear Price & Arrival Time Before We Head Out
Whether you need emergency lockout help or new lock installation, we ask a few simple questions on the phone and give you a clear price estimate before sending a technician.
Maryland Licensed (#507), Bonded & Insured
Our licensed Maryland locksmiths use safe, damage-free tools to open doors and stand behind every home lock job, smart lock upgrade, and commercial lock repair.
Fully Stocked Mobile Service Vans
Our vans carry high-security locks, mortise locksets, key-cutting machines, and key programmers so we can finish most jobs, including car key replacement, in a single visit.
How It Works
Simple Mobile Locksmith Service in 4 Easy Steps
Whether you need car lockout help, house lockout service, or commercial access control, we keep every step simple and clear.
Step 01
Tell Us What You Need
Call (240) 931-0762 or request a quote online. Let us know your lock brand or your car's make and model so we can give you an upfront estimate.
Step 02
We Send the Nearest Locksmith
Once you approve the estimate, we send our closest mobile locksmith in Greenbelt, Prince George's County, or Montgomery County and share an honest arrival window.
Step 03
Work Done Right at Your Door
Our technician arrives in a stocked service van to handle lock rekeying, deadbolt replacement, ignition repair, or key cutting on site.
Step 04
Test Your New Keys & Locks
You test every new key, keypad code, and door lock with your technician to make sure everything works smoothly, backed by our customer satisfaction guarantee.
Upfront Pricing Promise
How Locksmith Pricing Works
Standard deadbolt locks, commercial panic bars, and modern car keys all use different parts and tools. We ask the right questions on the phone so we can give you an honest price range before we head out.
- Clear price approval before any work starts
- No hidden mileage or surprise dispatch fees
- Discounted bundle rates when rekeying multiple locks
Type of Lock Hardware
Standard house lock cylinders cost less to service than heavy-duty commercial mortise locks, Mul-T-Lock or Medeco high-security locks, and electronic keypad locks.
Car Make, Model & Key Type
Your car's year and model determine if it uses a basic metal key, a laser-cut key, transponder key programming, or lost car key deprogramming.
Rekeying vs. Replacing the Lock
Lock rekeying adjusts your current lock to fit a new key for less money, while full lock replacement installs brand-new Schlage or Kwikset hardware.
Number of Doors or Locks
Single-door house lockouts and safe openings are priced by the job, while multi-door commercial rekeying and master key projects get bundled pricing.
Customer Reviews
What Our Customers Say
Read real customer reviews from Maryland homeowners, business owners, and drivers who called us for emergency lockouts and mobile locksmith services.
★★★★★
"My mom locked her keys in her car and was so upset about being stranded. I called Locksmith Guarantee and their technician Miles called us back. He arrived on site, the price was very reasonable, and he got the car unlocked in seconds. Definitely recommend!"
★★★★★
"Michael was very professional and honest. He told me I didn't need a new key fob, just needed my current key fob reprogrammed, and the price was great. Efficient service and a great attitude. I would definitely use them again."
★★★★★
"Miles did a great job. He arrived on time and got my car unlocked in less than 30 seconds. Professional, friendly, and reliable service. Couldn't have asked for a smoother experience during a stressful lockout."
Where We Work
Mobile Locksmith Service Across Prince George's & Montgomery Counties
Based in Greenbelt near I-495, I-95, and Route 1, our mobile technicians provide residential, commercial, and automotive locksmith services across Prince George's County and Montgomery County.
Mobile DispatchGreenbelt Dispatch Office
Address: 5442 Stream Bank Ln, Greenbelt, MD 20770
Hours: Sunday–Friday: 8:00 AM – 11:00 PM (Sat Closed)
Phone: (240) 931-0762
Helpful Locksmith Tips
Lock, Key & Security Guides
Read practical tips from our Maryland locksmith blog on protecting your home, business, and car.
Home SecurityHome & Business Lock Rekeying Guide in Prince George's County, MD
See how lock rekeying gives you fresh keys after moving into a new home or changing tenants without buying all new door hardware.
Car KeysCar Key Replacement & Key Fob Programming in Montgomery County, MD
Learn how our mobile vans cut and program replacement car keys and smart fobs on site so you can skip the dealership tow.
Business SecurityCommercial Locksmith Services in Maryland: Business Security Guide
Find out how master key systems, mortise locks, and exit bars help business owners and property managers keep their buildings secure.
Frequently Asked Questions
Common Questions About Our Locksmith Service
Have another question? Visit our full Maryland Locksmith FAQ page or call us at (240) 931-0762.
How soon can a mobile locksmith get to me in Central Maryland?
Our mobile locksmiths are based in Greenbelt and travel daily throughout Prince George's County, Silver Spring, Gaithersburg, and Montgomery County. When you call, we check our nearest technician's location and give you an honest arrival window before we head your way.
Are your locksmiths licensed and insured in Maryland?
Yes. Locksmith Guarantee holds Maryland Locksmith License #507 and is fully bonded, insured, and BBB A+ Accredited for residential, commercial, and automotive locksmith work.
Can you make a new car key or key fob if I lost my only key?
Yes. Our mobile vans carry key-cutting machines and programming tools to handle on-site car key replacement and smart fob programming for most major car brands, so you do not have to tow your vehicle to a dealer.
Should I rekey my locks or replace them when I move into a new home?
If your current locks are in good working shape, lock rekeying is the easiest and most affordable way to make sure old keys no longer work. If your locks are worn out or you want an upgrade, we also offer lock replacement and smart lock installation.
Contact Locksmith Guarantee MD
Need a locksmith for your home, business, or car? Call us directly to speak with our team, or send us a message using the form.
Telephone
(240) 931-0762
Email Address
locksmithguarantee1@gmail.com
Business Hours
Sun–Fri: 8:00 AM – 11:00 PM | Sat: Closed
Credentials & Service Area
Maryland License #507 • Greenbelt & Central MD