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*The Angi rating for Locksmith Service companies in Sullivan, MO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Locksmith Service needs.

*The HomeAdvisor rating for Locksmith Service companies in Sullivan, MO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Locksmith Service needs.

Last update on March 28, 2026

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Avatar for SafeStreets - ADT Authorized Provider
SafeStreets - ADT Authorized Provider
4.8(
320
)
Security Safe - Install

Serving Sullivan, MO and surrounding areas

Approved (Corporate)

In business since 2010

Free estimates

Emergency services offered

"AWESOME buying experience and setup experience! I just bought a house and wanted to make sure I was protected. They even helped me find a fantastic locksmith who gave a me great deal. Can't recommend highly enough. He gave excellent advice and saved me money in the long run with their current promo. Look no further for the best security company!"
Additional Photos
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+1

11 neighbors recently requested a quote
Recommended by94%of homeowners
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Avatar for ADT
ADT
4.5(
856
)
Security Safe - Install

Serving Sullivan, MO and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 1874

Free estimates

Emergency services offered

"ADT is the best company to talk to in terms of security alarm. Being a locksmith myself I know how important it is to deal with the right people. I referred a lot of customers to them and so far they are happy with their service. I myself got one for my house. Thank you for a consistent service and great deal."
Home Security Essentials
Smart Home Security
Cameras
Our Team
Home Security Essentials

+35

84 neighbors recently requested a quote
Recommended by88%of homeowners
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Avatar for Matt's General Home Improvements
Matt's General Home Improvements
5.0(
22
)
Hardware, Latches & Tracks (Door) - Repair or Replace

Serving Sullivan, MO and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

"Great prompt service, very good workmanship. Worked well with me re. project. Recommend him to future customers. Finished the work I have tried to get done for several weeks now by others and did it the next day!! Great guy !!"
Response time8 hrs
Recommended by85%of homeowners
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Avatar for Home Service
Home Service
4.2(
39
)
LocksmithLocksmith - For Business

Serving Sullivan, MO and surrounding areas

Approved (Corporate)

In business since 2010

Free estimates

Emergency services offered

"I do not typically write reviews but Locksmith downtown was excellent! They were incredibly responsive and solved my issue very quickly. They were very nice and professional and I would recommend their services to anyone!"
garage door
1912 neighbors recently requested a quote
Recommended by9%of homeowners
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Avatar for LJC Painting
LJC Painting
5.0(
2
)
Hardware, Latches & Tracks (Door) - Repair or Replace

Serving Sullivan, MO and surrounding areas

Approved

In business since 2019

Free estimates

Emergency services offered

We specialize in interior and exterior painting services, cabinet painting, staining, and more! We guarantee your satisfaction, and we won't leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Check out all the services we offer below and call -or- click to schedule a free estimate today!

Replaced decking
Finished product
TopShield installed
Finished Product
Before Paint

+1

8 neighbors recently requested a quote
Recommended by100%of homeowners
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Avatar for Locksmith 4 You, LLC
Locksmith 4 You, LLC
5.0(
1
)
LocksmithLocksmith - AutoLocksmith - For Business

Serving Sullivan, MO and surrounding areas

In business since 2002

Emergency services offered

Warranties offered

"AMAZING customer service, thanks Locksmith 4 You! If I could give him more stars I would! Managed to lock myself out, he showed up within 15 minutes of my phone call and took him 3 minutes to let me back in! If you're locked out and need someone reliable, punctual, fair priced and friendly."
Locksmith4you
keeping you safe
call Locksmith4you
Car Key replacement
need new keys?

+1

Response time10 mins
Recommended by100%of homeowners
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Locksmiths questions, answered by experts

Yes, as long as it’s thick enough for the deadbolt. Most interior hollow core doors are at least 1 1/2-inches thick, which is usually the minimum requirement for a deadbolt. You’ll want to find the lock block first before installing. Also, most hollow doors require additional reinforcement for locks, such as a reinforcement plate or plywood block.

Begin by checking the power source, typically a battery or wired connection. Ensure the battery is installed correctly, has sufficient charge, and isn't corroded. If it's a wired lock, examine the electrical connections to confirm they are secure and free from damage. Additionally, inspect the lock's programming or settings. Confirm that user codes or access credentials are programmed correctly and that any remote control devices are paired and functional.

If part of the key is protruding out of the lock, you can use a pair of needle-nosed pliers or tweezers to gently turn the key in the lock to open the door. If the key is fully inserted into the lock, you may also be able to use a key extractor to help turn the key into the unlocked position. 

But if the key breaks off halfway into the lock or you simply can’t reach it to help engage the unlocking mechanisms, you should probably call a professional.

Security experts recommend deadbolt locks as the most secure option for a house's exterior or entry doors. Deadbolts provide the best security because they can prevent most types of forced entry and are harder to lockpick. Common types include the standard single-cylinder deadbolt, which is often found on front doors. For enhanced security, you can opt for a double-cylinder deadbolt, which requires a key to operate from both the inside and the outside.

Standard residential deadbolt locks come with a steel bolt that locks your door into place using a key (or keypad) on one side and a thumb turn on the other. When you lock it, the bolt slides into a strike plate on your door jamb to secure your door shut.

The Sullivan, MO homeowners’ guide to locksmith services

From average costs to expert advice, get all the answers you need to get your job done.

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