Alarm Systems and Locks: Who Handles What

Two systems that share a door

A lock is a mechanical or electronic device that physically keeps a door from opening. An alarm system is a set of sensors, a control panel and a way of notifying someone when a sensor trips. They often protect the same door, but they do it in completely different ways, and the people who service them have different training and equipment.

Many homes and businesses have both. A deadbolt stops the door from opening, and a contact sensor on the frame tells the alarm panel when the door has opened. If one fails, the other does not automatically cover for it. A lock does not make a sound, and an alarm does not hold a door shut.

The practical result is that when something goes wrong, you need to know which system the problem belongs to. Calling the wrong trade costs time and sometimes leads to well meaning attempts that cause damage. This page lays out the usual division of work in plain language, with the caveat that your setup may differ.

Another way to see the difference is by what happens when each one fails. A failed lock usually means someone cannot get in or someone else can. A failed alarm usually means nobody is told. The first is a physical access problem and the second is an information problem, and that is why different specialists handle them.

What an alarm company normally handles

The alarm company sets up and maintains the control panel, keypads, sensors, sirens, communicators and the monitoring service if you have one. That includes door and window contacts, motion detectors, glass break sensors and any wiring or wireless links among them. If a panel shows a trouble message, a battery warning or a zone fault, that is theirs to sort out.

They also manage your account: user codes on the panel, the passcode you give the monitoring center, the list of contacts and the schedule for arming. If a code is lost or an employee leaves, the alarm provider is the one to change the panel codes.

Never open a panel or pull wires to try to stop a siren. Panels are designed to alert on tampering, and doing it can create a bigger problem. If an alarm is sounding and you are unsure why, follow the instructions your provider gave you, and contact them.

Monitoring contracts are worth reading with care. They explain who is called first, what happens if nobody answers, and what the provider needs from you. Keep a copy somewhere you can reach it, and make sure every person on the contact list knows they are on it.

If you add a new door, install new windows or remodel, tell the alarm company early. Sensors are simple to plan for and awkward to add after drywall and trim are done.

• Panel faults, trouble messages and low battery warnings.
• Adding, moving or replacing door and window sensors.
• User codes, passcodes and monitoring contacts.
• Sirens, keypads and communicators.
• Programming schedules and arming rules.

What a locksmith normally handles

A locksmith deals with the lock hardware: cylinders, deadbolts, handlesets, strikes, keys, keypads on the lock itself, and the door and frame hardware that supports them. That covers rekeying, replacing a lock, cutting and programming keys, opening a locked door when you are shut out, and repairing a lock that sticks or will not turn.

A locksmith can also advise on how a lock fits a door and frame, which matters for strength. Our strike plate screw guide and the door frame checks explain some of that thinking.

What a locksmith generally does not do is program your alarm panel or service your monitoring account. If the work touches both, the two professionals may each handle their own part, and it helps if you tell each of them about the other.

Some locksmith work includes electronic locks, access control and electric strikes, especially for businesses. These have their own wiring and often connect to a separate power supply. When they interact with a fire alarm panel, specific safety rules apply and requirements vary, so the building owner and the local authority are the ones to ask.

A good technician will say plainly when a job belongs to someone else. That honesty saves you from paying twice.

The shared zone: doors with contacts

Door contacts are the most common place where the two trades meet. A magnetic contact is typically two small pieces, one on the door and one on the frame. When the magnet separates, the panel knows the door opened. These are often mounted near the edge of the door, close to where hardware goes.

If you replace a lock, strike plate or door, the contact can be affected. A new, thicker plate may sit differently. A new door may need the magnet moved. A locksmith who knows there is a contact can work around it, and an alarm technician can reposition it afterward if needed.

If you want a smart lock that reports whether the door is locked, the lock may report to its own app and not to your alarm panel. Some systems do connect, but most households keep the two separate. Ask about compatibility before you assume they will talk to each other.

Wireless contacts are common in retrofits. They contain a small battery and a transmitter and are easy to place, but the battery eventually runs low and the panel will report it. Replace those batteries when the panel says so, or arrange for the alarm company to do it.

Wired contacts run through the wall and are usually installed during construction. If a lock replacement involves removing trim, ask the technician to be careful with any wires running through the frame.

Lockouts when an alarm is armed

A very common problem is being locked out of a building with an alarm set, particularly a business. Opening the door is a locksmith job, but silencing or resetting the alarm is the alarm company's job. If the panel is armed and the door opens, it may sound a siren and notify the monitoring center.

Before anyone opens the door, tell the locksmith about the alarm. You will usually need to have the passcode ready, or reach the person who has it. If you do not know the code, contact the alarm provider first so they can speak with you and cancel any dispatch.

False alarms can trigger fees or a police response in some areas, and the rules differ by location. Ask your alarm company what your community requires. This is a good reason to plan ahead, as covered in the office key control basics.

Business owners should keep a short written plan for lockouts: who has keys, who has alarm codes, who the alarm provider is, and what the passcode is. The plan should be stored somewhere safe and shared only with trusted staff.

Employees sometimes try to solve a lockout by forcing a door, which damages the frame and sets off the alarm at the same moment. Calling the right people in the right order is always simpler and calmer.

Rekeying and changing locks in a home with an alarm

Rekeying changes the pins inside a cylinder so old keys stop working, and it does not touch the alarm. You can rekey without involving your alarm company. The guide to how rekeying changes who can enter explains the idea.

Your alarm codes are separate from your keys. After a move or after someone loses a key, change both if the situation calls for it. A person who still knows the alarm code could disarm the panel even if their key no longer works, and a person with an old key could still enter if the alarm is not set.

For a new home or a new tenant, treat the alarm code as part of the same checklist. The moving day lock checklist includes a step for it, along with what to ask the previous occupant or the alarm provider.

If a break in has happened, the door and lock may need attention while the alarm provider checks sensors and wiring. Both visits are useful, and it helps to tell each one what the other found. The after a break in security page describes the lock side of that work.

Insurance companies often want to know what protection was in place. Keep records of lock changes and alarm service for your files.

Keypads, fobs and credentials that look similar

It is easy to confuse the keypad on the alarm panel with the keypad on a smart lock. The first controls the alarm system. The second controls the lock. They may use different codes, and changing one does not change the other. Label them in your own notes so family members know which is which.

Key fobs and cards add to the confusion. A fob that arms and disarms the alarm is not the same as a fob that opens a car or a door. Each belongs to its own system and is programmed by whoever manages that system.

If you lose a fob, report it to the correct party. For an alarm fob, call the alarm provider. For a car or an access card, see the relevant page, such as how vehicle key fobs work.

Some alarm keypads also include a panic button or a duress code. These belong entirely to the alarm side. If you have questions about how they behave, ask your provider and have them explain the exact steps for your system.

A code written on a sticky note by the door is a common mistake. If you must keep a written record, store it somewhere secure and not visible from outside.

Storms, power cuts and backup batteries

Central Florida storms can cut power for hours. Alarm panels have backup batteries, and smart locks run on their own cells. Batteries wear down, and a long outage can leave a panel with a low battery warning or a lock with a dying display. Replace both on a schedule rather than waiting for a failure.

An alarm that relies on a phone line or an internet connection may lose its link to the monitoring center during an outage. Ask your provider how your system reports in that case, and whether a cellular backup is part of it.

The preparing doors for a storm warning guide includes lock related steps you can take before bad weather arrives, and the after a storm checklist helps once the weather has passed.

Sirens and strobes are not meant to be silenced by guesswork. If a siren sounds repeatedly during a storm, the cause may be a wet sensor, a failed battery, or a surge. Your provider can look at the event log and help you identify what happened.

After the storm, check that every door still closes squarely, since swollen frames can keep contacts from aligning.

Landlords, tenants and managed buildings

In rented homes and managed buildings, the alarm may belong to the owner or to the tenant, and the arrangement differs from lease to lease. Ask who holds the account and who may change codes. Do not assume that a panel left by the last tenant is yours to reset.

Landlords who rekey locks between tenants should coordinate with whoever manages the alarm, so a former occupant does not keep working codes. The rental property rekey planning guide is a useful companion.

Condo and apartment communities may have building wide systems, with entry panels and shared alarms. Those are managed by the association or building staff, and the rules about who may service them are set locally, so contact the management office.

Property managers who service many units benefit from a single document that lists, for each unit, the lock type, the keyway and the alarm situation. The key handover checklist for managers offers a starting point.

Tenants who bring their own alarm should check with the landlord first. Drilling and wiring in a rental can create disputes, and some leases forbid it.

A short table of thumb: who to call

Call the alarm company when a panel, sensor, siren or monitoring account is the problem. Call a locksmith when a key, cylinder, deadbolt, handle, strike or lock related door hardware is the problem. When a lockout happens in a building with an armed alarm, plan to speak with both.

If you are unsure, describe what you see. A technician can usually tell from a description whether the issue is electrical, mechanical or both. Do not be embarrassed to ask, since the boundaries between trades are not always clear to people outside them.

When you call Orlando Locksmith, mention any alarm on the door. The team confirms that you have authority over the property, explains the work and the price before starting, and tests the finished lock with you, keeping the door contact and any wiring in mind as the work is done.

A final note on expectations. A technician who arrives for a lock job will not be able to repair a panel, and an alarm technician who arrives for a sensor will not rekey your cylinders. Saying clearly what you need helps the right person show up.

Questions worth asking each provider

For the alarm company: which doors and windows are protected, what codes exist, who is on the call list, what happens in a power or network outage, and how a technician should handle the panel during a lock change. Write down the answers and keep them with your other household records.

For the locksmith: what type of lock is on each door, how many keys exist, whether any keys are restricted or can only be copied with authorization, and what the plan is if you lose one. The questions to ask before any locksmith starts work offers a fuller list.

The answers help you keep a clear picture of your own security. They also make future calls shorter, because you can describe your setup in a few lines and the person on the other end can plan accordingly.

If something does not make sense, say so. Neither trade should leave you confused about what protects your door.

Questions people ask