ADT vs Lockly 2026: Installed Alarm Monitoring, Smart Lock Access, Outages, and Cost

Editorial note: This is a source-based comparison, not a hands-on test. ADT offers professionally installed home alarm packages with professional monitoring. Lockly sells smart locks and related access products in several hardware and connectivity versions. Plans, quotes, terms, lock models, app functions, integrations, prices, and availability can change. Confirm the exact ADT package and the complete Lockly model before buying.

Short answer: Choose ADT when the primary job is detecting intrusion across a home and sending supported alarm events into a professional response path. Choose Lockly when the primary job is controlling who can open one door, when they can enter, and how that access is removed. A Lockly smart lock is not a whole-home alarm, and a ADT contact does not control the deadbolt. Many households can use both, but the alarm and access layers need separate owners, tests, and fallback plans.

ADT vs Lockly at a glance

The decision starts with the security job

ADT and Lockly are not substitutes for the same task. ADT can make a direct door contact part of an armed perimeter and send supported alarm events through the monitoring path included in the chosen plan. Lockly can move the deadbolt and manage credentials for an exact lock model. One answers “did a protected zone trigger?” The other answers “is the lock secured, and which approved person can enter?”

Start the buying worksheet with four separate outcomes:

• Delay entry: door, frame, strike, latch, and deadbolt;
• Detect entry: direct contact, motion sensor, glass-break path, or another listed device;
• Warn occupants: hub, keypad, siren, phone alert, and a local action plan;
• Escalate: named household contacts and professional monitoring for supported events.

A lock can help with the first job. An alarm can perform the second and third. A monitored ADT plan can add the fourth. A buyer who writes these jobs first is less likely to mistake app visibility for alarm coverage.

ADT’s strongest case

ADT is the stronger choice when the household wants an installer-led alarm with direct sensors and professional monitoring. Use the current ADT site to request the package, device schedule, plan, and terms for the address. Do not compare an advertised starting figure with a Lockly hardware price as if the scopes were equal. The ADT side can include equipment, monitoring, communication, video or storage options, taxes, shipping, and service terms.

Capture before ordering

• hub, keypad, siren, contact, motion, glass-break, environmental, camera, and doorbell models;
• quantity and intended location for every device;
• which events are monitored and which create local or app alerts only;
• internet, cellular, power, battery, and restoration behavior;
• entry, exit, stay, away, instant, bypass, silent, tamper, and duress behavior where offered;
• monitoring plan, camera service, storage, verification, and app requirements;
• equipment payment, service term, renewal, cancellation, moving, and return rules;
• permit, registration, false-alarm, and dispatch responsibilities for the address;
• support hours and the process for replacing, moving, or deleting a sensor.

Professional installation does not replace acceptance testing. The owner has to trigger each direct zone, check naming and placement, confirm local sound, and verify the permitted monitoring test route before treating the system as ready.

Lockly’s strongest case

Lockly is the stronger choice when the household needs controlled access at a particular door. The Lockly smart-lock range includes different keypad, keyway, fingerprint, Wi-Fi, Bluetooth, and platform-specific packages. A family name is not a full specification. Record the exact product name, model number, finish, entry methods, connectivity, and included components.

Capture before buying

• backset, bore, door thickness, handing, frame condition, strike position, and keyway or key-free design;
• touchscreen, keypad, fingerprint, physical key, phone, a supported smart-home credential, and emergency entry methods on the exact model;
• Bluetooth, built-in Wi-Fi, plug-in module, bridge, home hub, and account requirements;
• direct door-position sensing inclusion, mounting, calibration, and reported states;
• guest-code creation, schedule, expiry, history, and removal;
• auto-lock, auto-unlock, one-touch lock, passage, privacy, or vacation behavior where offered;
• battery type, warning route, replacement process, emergency power, and manual egress;
• remote-access and smart-home support for that model, region, firmware, and account;
• owner recovery, household transfer, factory reset, and disposal process.

A smart lock should first be a dependable lock. App features do not fix a door that needs to be pushed, lifted, or pulled before the bolt can move.

Door fit comes before automation

Operate the existing deadbolt by hand before ordering a smart replacement. Close the door slowly. Confirm the latch catches and the bolt throws with normal pressure. Check the door after temperature and humidity changes where those conditions affect the frame. Fix hinge, strike, seal, and alignment problems before asking a small motor to overcome them.

Physical acceptance checks

1. Measure the bore, backset, thickness, edge, and available trim clearance.
2. Confirm the chosen Lockly model matches the door and local fire or egress requirements.
3. Close and lock the door ten times by hand without pushing or pulling it into place.
4. Install the hardware without pinching cables or overtightening the interior assembly.
5. Calibrate the lock and direct door-position sensing path when included.
6. Run ten motorized lock and unlock cycles while listening for strain.
7. Test interior manual egress, exterior fallback entry, and emergency access.
8. Recheck the strike and frame after the first week.

Repeated motor strain can shorten battery life and produce misleading app state. Fix the physical cause rather than increasing an auto-lock delay or dismissing the warning.

Door contact, lock state, and door position are different

A household can see three different states at the same entrance:

• ADT contact: whether the protected opening is open or closed from the alarm sensor’s point of view;
• Lockly lock: whether the deadbolt reports locked or unlocked through the supported lock path;
• a separate direct door-position sensor: whether the door position reports open or closed on a supported, calibrated package.

These states can disagree. A deadbolt may extend while the door is ajar. A contact may show closed even though the bolt is not thrown. An app may show an old state after connectivity loss. Test each sensor physically, then decide which state is authoritative for each alert and routine.

Professional monitoring versus access history

ADT monitoring and Lockly access history answer different questions. Monitoring can receive supported alarm events and follow the plan’s verification and contact procedure. Lockly history may show lock actions, credentials, or app activity under the exact model and service rules.

For ADT, document

• monitoring provider and selected plan;
• primary and backup communication paths;
• event types that reach monitoring;
• verification rules, contact order, passcodes, permit number, and dispatch instructions;
• test mode, abort, cancellation, and restoration steps;
• who updates contacts after a phone, tenancy, or household change.

For Lockly, document

• which actions appear in history and how quickly;
• whether code, fingerprint, supported smart-home credential, app, physical key, or interior thumbturn is distinguished;
• which history and remote functions need internet, Wi-Fi, a module, or a home hub;
• who can view, manage, or remove records and credentials;
• how long useful history remains available;
• how a disputed access event is checked against door contact, camera, and alarm history.

Do not use access history as proof of identity beyond what the named credential can support. A shared code identifies the code, not necessarily the person who entered it.

Codes and accounts need named ownership

Give each resident, guest, cleaner, dog walker, or carer the smallest permission and shortest useful period. Do not hand out the owner login or one permanent shared code when an individual scheduled credential will do.

Access removal is a checklist, not one button. Delete the Lockly credential, ADT user, smart-home membership, camera access, voice-assistant access, recovery method, and any physical key that should no longer work.

Arm, disarm, lock, and unlock are separate actions

A departure routine may lock Lockly and arm ADT. An arrival routine may unlock the door and start the alarm’s entry period. Do not assume one command proves the other completed, and do not assume the two services expose a supported direct integration.

For every combined routine, record:

• trigger and required conditions;
• requested lock action and confirmed lock result;
• requested alarm action and confirmed alarm mode;
• timeout, retry limit, and duplicate-command protection;
• failure alert and who receives it;
• manual recovery;
• which account can edit the rule.

Do not automatically disarm or unlock from phone location alone. A geofence can be late, stale, or tied to the wrong resident. If a third-party platform joins the systems, test one person home, everyone away, a dead phone, a guest arrival, an open door, and an internet outage before trusting the routine.

Auto-lock needs door-state evidence

Auto-lock can correct a forgotten deadbolt or create a lockout. Test it with the door open, ajar, closed, and reopened during the countdown. On supported packages, calibrate direct door-position sensing and confirm the door-position result rather than treating “lock command sent” as proof.

Check:

• short and long delay settings;
• night, school, delivery, caregiver, and travel schedules;
• battery-low and offline behavior;
• manual exit and emergency return;
• what happens when the bolt cannot seat;
• whether the owner gets a failed-lock alert;
• whether any alarm routine waits for a confirmed state or only issues a command.

The safe design reports failure. It does not silently turn a jammed bolt into a green app icon.

Smart-home and interoperability paths

Do not assume a Lockly model connects directly to ADT. Compatibility belongs to the complete lock model, hub or bridge, firmware, region, phone platform, account, and the currently supported integration. Marketing badges and app visibility do not prove that a lock event becomes a monitored alarm zone or that unlocking safely changes alarm mode.

If a smart-home platform sits between the systems, record its owner, hub, invited residents, remote-access path, credential types, recovery method, and outage behavior. Test the final physical lock, direct opening sensor, and alarm state after every routine. Keep a local entry and manual-egress path that does not depend on internet or one phone.

Cameras do not prove lock or alarm state

A ADT package may include cameras or a video doorbell. Lockly’s comparison role is access. If video is present, document its field of view, audio, recording trigger, storage, retention, viewers, download process, verification use, subscription, and outage behavior.

A camera can show activity within its view. A Lockly event can show that a credential or lock action occurred. A ADT contact can show that the protected opening changed state. None alone proves the complete event. Use the least intrusive evidence that performs the job, especially in rentals, shared homes, and homes with carers.

Power, internet, battery, and recovery

Test failures only after informing household members. Put the monitored alarm in the approved test state before triggering or disconnecting anything that could create an alarm signal.

Lockly failure checks

• low-battery warning reaches the owner and a backup person;
• local keypad, fingerprint, supported smart-home credential, physical key, app, or emergency-power path behaves as documented;
• interior manual egress remains available;
• Wi-Fi loss is visibly different from locked or unlocked state;
• remote access fails without breaking approved local entry;
• direct door-position sensing and lock state recovery without a stale routine;
• battery replacement preserves or safely restores codes, calibration, and ownership.

ADT failure checks

• hub, keypad, direct zones, and local siren during internet loss;
• cellular or other backup communication included in the selected service;
• camera and app behavior during network loss;
• power warning, backup duration, and restoration behavior;
• monitoring receipt through the approved test route;
• tamper, trouble, bypass, low-battery, or offline states after restoration.

“Offline” must not look like “secure.” A failed lock, contact, hub, camera, or communication path needs a distinct warning and a named person who acts on it.

False alarms and lockouts are operating failures

ADT buyers should measure false alarms, missed alarms, trouble states, late notifications, and contact failures. Lockly buyers should measure failed unlocks, motor jams, stale state, dead batteries, code problems, and lockouts. Both need a repair trigger rather than a habit of ignoring warnings.

Use this rule:

1. record the event, time, device, state, person, and conditions;
2. check physical state before resetting;
3. identify placement, alignment, battery, network, account, or process causes;
4. repair or replace the cause;
5. repeat the relevant route test;
6. update the device schedule and household instructions.

A recurring nuisance alert teaches people to dismiss real ones. A recurring jam teaches them to leave the door unlocked. Neither is an acceptable steady state.

Permits, contacts, and response ownership

Professional monitoring does not remove the owner’s local duties. Check alarm-registration and permit rules for the address. Record the permit number, expiry, responsible party, false-alarm rules, monitoring contacts, passcodes, and dispatch instructions.

Build a response table:

Review the table after a move, travel period, new carer, tenancy change, phone change, or monitoring-plan change.

Three-year cost worksheet

Compare three-year cost at equal scope. Do not compare one Lockly lock with a whole-home ADT package and call the cheaper total the winner.

ADT cost lines

• hub, keypad, contacts, motion, glass-break, environmental, video, and accessory hardware;
• shipping, taxes, activation, permit, and replacement mounting supplies;
• monitoring, app, cellular, video, storage, or verification service;
• added sensors, batteries, replacement devices, and support costs;
• rate changes, term, renewal, cancellation, moving, and return obligations;
• time for setup, testing, contact maintenance, and incident review.

Lockly cost lines

• lock, finish, keyway, module, Wi-Fi path, bridge, home hub, or other required hardware;
• locksmith, door repair, strike alignment, rekeying, and spare keys;
• batteries and expected replacements;
• optional services or platform costs tied to the chosen path;
• additional doors and separate locks;
• time for code review, account maintenance, battery response, and owner transfer.

Also price the mixed design: ADT for the protected perimeter and response chain, Lockly only at doors that need named access. The mixed plan is valuable only if each product has a defined job and a tested failure path.

When ADT is the better choice

• You need direct intrusion zones across more than one opening.
• You want a local siren and professionally monitored response path.
• You prefer an installer-led alarm deployment and will verify the quote, contract, and handoff.
• You can maintain contacts, permits, tests, batteries, and service terms.
• A smart lock alone would leave motion, windows, and escalation unmonitored.

When Lockly is the better choice

• You need named, scheduled, or temporary access at a compatible door.
• You want to remove a guest code without changing every resident’s entry.
• The exact model supports the keypad, key, fingerprint, Wi-Fi, or Apple path you have chosen.
• You can fix door alignment, manage batteries, and keep a safe fallback entry method.
• You do not need the lock by itself to provide whole-home alarm monitoring.

When using both makes sense

Use ADT for direct alarm zones, modes, siren, communication, and monitoring. Use Lockly for physical deadbolt control and named access. Keep the roles separate even if both appear in one app or smart-home routine.

A mixed design should document:

• which ADT contact protects the Lockly door;
• which Lockly model, connectivity path, and credentials are in use;
• whether any supported integration exists and exactly what it exposes;
• which system owns lock, door, alarm, camera, and response state;
• whether unlocking can affect alarm mode and whether that is safe for every credential;
• how failure alerts reach the right person;
• how both systems are tested after a device, app, account, plan, or network change.

For related alarm comparisons, use ADT vs Schlage, Cove vs Lockly, SimpliSafe vs Lockly, Frontpoint vs Lockly, and Abode vs Lockly. Reuse the scope and failure tests rather than copying a verdict.

60-minute ADT vs Lockly acceptance test

Run this test after setup, after a major app or plan change, and after moving equipment. Tell household members. Put professional monitoring into the approved test state before creating alarm events.

1. Minutes 0–5 — Record state. Write the ADT hub, plan, direct sensors, communication paths, contacts, permit state, and test-mode process. Write the complete Lockly model, door, entry methods, connectivity, direct door-position sensing state, owner, and battery level.
2. Minutes 5–10 — Check the door. Close, latch, lock, unlock, and reopen the door by hand. Confirm no push or pull is needed. Check the strike and manual egress.
3. Minutes 10–15 — Test Lockly entry. Use each approved keypad, key, fingerprint, supported smart-home credential, or app method available on the exact model. Confirm a removed or expired credential fails.
4. Minutes 15–20 — Test lock evidence. Compare physical bolt state, Lockly app state, direct door-position sensing state when included, and any smart-home state. Test closed-unlocked, closed-locked, open-unlocked, and safe ajar cases.
5. Minutes 20–28 — Test ADT direct zones. Trigger the contact at the Lockly door, another perimeter contact, and one interior detector in the approved mode. Confirm names, timing, local indications, and restoration.
6. Minutes 28–35 — Test alarm response. Trigger an approved test alarm. Confirm siren, app alert, monitoring receipt, contact route, abort or cancellation procedure, and return to normal.
7. Minutes 35–40 — Test routines. Run any departure or arrival rule. Confirm both the requested action and final ADT/Lockly state. Force one safe failure and verify the alert.
8. Minutes 40–46 — Test internet loss. Disconnect the normal internet path under safe conditions. Check Lockly local entry, remote-access failure, ADT local alarm behavior, backup communication, and visible offline warnings.
9. Minutes 46–51 — Test power and battery procedures. Review hub backup, Lockly low-battery path, replacement supplies, emergency entry, and manual egress. Do not create an unsafe lockout.
10. Minutes 51–56 — Test people. Confirm resident, guest, carer, and backup roles. Remove one temporary credential and verify it no longer works. Review monitoring contacts and recovery owners.
11. Minutes 56–60 — Restore and record. Exit test mode, restore connectivity, close bypasses, clear trouble states, confirm final door and alarm state, and save the device schedule, results, failures, and repair owner.

Reject or repair the design if

• the Lockly bolt needs the door pushed or pulled;
• physical lock, door, and app states cannot be reconciled;
• a removed credential still opens the door;
• a direct ADT zone is mislabeled, bypassed, late, or absent from the planned response;
• monitoring contacts, permit state, passcodes, or test procedures are unknown;
• internet loss looks like a secure state;
• a routine unlocks or disarms without clear household consent;
• one lost phone or unavailable owner blocks recovery;
• the quote, service terms, model, and required accessories are not in writing.

Final verdict

ADT wins the alarm-and-response decision. Lockly wins the controlled-entry decision. Neither wins by being cheaper at a different job. If the household needs only named access at one compatible door, buy and test the exact Lockly model. If it needs direct sensors, modes, siren, and monitored escalation across the home, scope ADT at the address. If it needs both, make ADT the alarm authority and Lockly the access authority, then prove the boundary with the 60-minute test.

Andrew Becker

With over 20 years of experience evaluating home security technologies, Andrew is a trusted home security expert. He specializes in DIY home security systems, indoor and outdoor security cameras, doorbell cameras, and safety software such as password managers. Andrew uses in-depth research to provide accurate and actionable insights. His work helps you make better decisions to protect your home.