Home Security · Service

Smart locks and access control — the door decides everything

A motorised bolt has none of the strength you unconsciously apply to a sticking door. Fit one to a dropped or misaligned door and you have bought a lock that jams.

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In short

What is access control and smart locks?

A smart lock replaces your existing deadbolt with one driven by a motor, a keypad or an app. Fitting it takes minutes; making it reliable depends on the door. The bolt must throw fully into the strike with no resistance at all, because a motor cannot lean on a door the way your hand does. Access control extends that to codes you can issue and revoke.

Triggers

Signs you need access control and smart locks

You lift, push or pull the door to get the deadbolt to turn — today, with a key
Keys have gone out to cleaners, contractors or family and never come back
Somebody regularly gets locked out, or there is a key hidden outside
You want a record of who came in and when, or a key has been lost and rekeying everything is the current plan
You need to let a delivery or a tradesperson in once, when you will not be home

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The job

How access control and smart locks actually works

Assessing the door, and measuring the backset

Close the door and throw the existing deadbolt with two fingers. If it needs a shove, a lift or a firm turn, the door has dropped or the strike is misaligned. Then measure: the backset is the distance from the door edge to the centre of the bore and comes in two common dimensions, and bore diameter and door thickness must sit inside the new lock's stated range.

Watch for: A door that only sticks in one season, and a previously modified bore that the new escutcheon will not cover.
Strike alignment and the frame behind it

The bolt should enter the strike centrally and travel its whole throw into a box or deep mortise, not scrape the edge of a plate. Where a door has settled, realigning the strike comes before the lock goes anywhere near it.

Watch for: Bare, scraped metal on one edge of the strike plate — the motor forcing the bolt every time, and why the batteries will not last.
Choosing how people will actually get in

A keypad works with no phone, account or network, which suits children, older relatives and tradespeople. App access handles remote entry and time-limited permissions. A key override costs nothing to keep. Decide the mix before the model.

Watch for: A keyless model with no physical override, where somebody depends on the door and cannot troubleshoot a phone.
Codes, credentials and revocation

Access control is about issuing and withdrawing access, not opening a door. Give each person their own code, so a departure means deleting one entry rather than re-coding everyone. Temporary codes cover one-off visits.

Watch for: A single shared code everyone has and nobody changes — the smart-lock version of the key under the mat.
Power, network and what fails when

Smart locks run on batteries and usually warn before they die. Connectivity is needed for remote access and notifications, not normally for the keypad. Knowing which functions survive a dead network and which a dead battery separates an inconvenience from a lockout.

Watch for: Assuming everything works offline. Ask: with no internet, does the keypad open the door? With flat batteries, what is the recovery method?

Money

What does access control and smart locks cost?

A consumer smart deadbolt is an affordable retail purchase and fits in under an hour on a door that is already true. The costs that surprise people are the door work — realigning a strike, easing a dropped door, repairing a soft jamb — and multi-door credential systems.

See the full access control and smart locks cost guide — by material, size and region →

Straight answer

When access control and smart locks is the wrong call

Everyone else ranking for this is paid when you say yes. Here's when you shouldn't.

The door binds, drags or has dropped on its hinges. Fix the door first. A motor cannot do what your wrist has been quietly doing for years, and the lock gets blamed for the door's fault.
The frame around the strike is soft, split or filled. Electronic access on a jamb that gives way under a shoulder is theatre. Reinforce the frame first; it is cheaper than the lock.
The door is not the weak point. A smart deadbolt beside a single-glazed sidelight, an unlocked patio slider or a garage service door on the latch changes nothing about how someone gets in.
Nobody will manage the codes. Access control is only worth having if credentials are issued individually and revoked. Unmanaged, it becomes one shared code and a false sense of an audit trail.
It is a rented property. Deadbolt replacement is usually a landlord decision, and many tenancies require written permission and a key or code handed over. Ask before drilling anything.

Your options

Types of access control and smart locks

Lock and credential comparisons

Keypad, app, fob and key.

Access hardware

Deadbolts, electric strikes, readers, controllers.

Lock problems

Jamming bolts, flat batteries, dead codes.

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Straight answer

Can I do this myself?

The risk here is not electrical — it is being locked out, or leaving a door that appears locked and is not. Never remove the existing lock until the replacement is in your hand and confirmed to match the backset, bore and thickness, and test any new lock from outside with the door closed before relying on it.

Reasonable to DIY

Replacing a deadbolt like-for-like on a door that already locks with two fingers
Fitting the escutcheon, batteries and mounting plate supplied with a consumer lock
Replacing short strike screws with long screws that reach the framing behind the jamb

Call a licensed pro

The door needs easing, planing or rehanging — joinery, and done badly it leaves a door that never seals again
The bore is enlarged or offset from previous hardware, so a new lock will not seat squarely, or the jamb is soft and the strike needs relocating into fresh timber
More than one door on a shared credential system, with common users across entrances
Anything wired — an electric strike, a maglock or a powered gate, involving a power supply, fail-safe versus fail-secure behaviour and code-set egress
A fire-rated or multi-point locking door, where the hardware is part of a tested assembly

Before you sign

What to check when hiring for access control and smart locks

Does this door close and lock with two fingers, and if not, what needs doing?

The question the whole installation depends on. Anything short of a confident yes means door work comes before lock work.
What is my backset and door thickness, and does the lock I want fit both?

A lock that does not fit is the most avoidable failure here, and it is discovered after the old one is off.
Will the strike be repositioned, and are the screws long enough to reach the framing?

Bolt throw into a properly fixed strike is what resists force. Short screws into trim look identical and do nothing.
With no internet, does the keypad still unlock — and how do I get in on flat batteries?

Two different failures. If the battery answer needs an item you do not carry, solve that now rather than on the doorstep.
Can I give each person their own credential, delete just theirs, and see it in the log?

The whole point of access control. A log recording only "unlocked" tells you nothing useful.

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Local pros

Access Control and Smart Locks near you

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Related work

Often done at the same time

Smart Doorbell Installation

Seeing who is at the door you just secured

Security System Installation

Contacts, zones, monitoring

Commercial Security Installation

Staff credentials across multiple doors

Security System Repair

When existing hardware stops behaving

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FAQ

Access Control and Smart Locks — questions people ask

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Why does my smart lock jam or fail to lock?

Almost always because the bolt is meeting resistance. A door that has dropped or swollen binds against the strike, and where your hand would unconsciously lift or push to help the bolt through, a motor simply stalls. Scraped metal on one edge of the strike plate is the tell. The fix is the strike or the door, not the lock.

What is a backset, and why does it matter?

It is the distance from the edge of the door to the centre of the hole the lock sits in, and residential doors use one of two common dimensions. Most smart locks ship with an adjustable latch handling both; some do not. Measure it, with the door thickness and bore diameter, before ordering — otherwise you find out with the old lock already off.

What happens if the batteries die or the Wi-Fi goes down?

They fail differently. Losing connectivity generally costs you remote access and notifications while the keypad and any physical key keep working locally. Losing battery power costs you everything electronic, and the recovery method varies by model — a keyed override, external contacts, or in some cases nothing. Establish both answers before depending on the lock.

Are smart locks as secure as a normal deadbolt?

The mechanical part is what resists force, and a smart deadbolt throwing fully into a properly fixed strike is comparable to a good conventional one. What is added is a second category of concern — codes, accounts and connectivity. In practice the strike plate and the screws behind it matter far more than anything in the lock's specification.

Can I give a cleaner or a contractor temporary access?

That is the best reason to have one. Most systems allow codes valid only between certain times or days, and every credential should be issued individually so a person leaving means deleting one entry. Check the log records which credential was used, not just that the door opened.