What Happens When a Digital Lock Cannot Be Installed?

You have selected a digital lock, confirmed the installation appointment and prepared your entrance.

But what happens if the installer arrives and discovers that the chosen lock cannot be installed?

This is an understandable concern; especially when replacing an existing lock or fitting both a digital door lock and gate lock.

At Interlock Singapore, we reduce this risk by reviewing entrance photos and measurements before confirming a recommendation.

When the photos suggest that the preferred model may have a compatibility concern, we will usually discuss a backup lock with the customer before the installation appointment.

The installer can then assess the actual entrance onsite and proceed with the most suitable agreed option.

Jump to a Section

• Why a digital lock may not fit
• How Interlock reduces the risk
• Why we may discuss a backup lock
• What happens during the onsite appointment
• What happens when the price changes
• How no-fit, no-fee works
• What happens before permanent work begins
• What customers should send us
• Common installation scenarios
• Frequently asked questions

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Why Might a Digital Lock Be Unable to Fit?

Digital lock compatibility depends on more than the door material or the appearance of the existing lock.

The installer must consider:

• The existing lock cut-out
• The available door or gate surface
• The lock body dimensions
• The mortise and bolt position
• The door frame and strike area
• The door and gate thickness
• The clearance between the main door and gate
• Existing handles, handlebars or decorations
• The condition of the door, gate and frame

A model may appear suitable in a product photo but still be incompatible with the actual entrance.

1. The Existing Cut-Out Is Too Large or Positioned Differently

When an old lock is removed, it may leave:

• Large mounting holes
• A long mortise cut-out
• Drill holes in unsuitable positions
• Damage that the new lock cannot cover

The replacement lock must be installed securely while also covering or working around the existing installation area.

2. There Is Not Enough Door Surface

A digital lock requires sufficient space for its front and rear bodies.

Installation may be affected by:

• A nearby door edge
• A raised decorative panel
• A separate handlebar
• A narrow stile
• A glass section
• An existing accessory

3. The Door and Gate Are Too Close Together

For homes with both a main door and gate, the two lock bodies and handles need enough clearance.

If the gap is insufficient:

• The handles may collide
• The door or gate may not close fully
• One lock body may press against the other entrance
• The selected bundle may need to be changed

4. The Gate Design Does Not Provide a Suitable Mounting Area

Some gates have:

• Narrow metal bars
• Decorative patterns
• Uneven surfaces
• Limited space for the rear lock body
• A bracket position that does not suit the selected lock

A different gate-lock model or additional installation planning may be needed.

5. The Strike or Frame Is Unsuitable

The lock bolts need a secure receiving area.

Installation may be affected by:

• A damaged frame
• A loose strike plate
• A very large door-to-frame gap
• An unusual metal frame
• Previous modifications
• Poor door alignment

6. The Door or Gate Has Shifted

A door or gate may sag, warp or move over time.

The selected lock may physically fit, but the bolts may not align properly with the strike unless the entrance is adjusted.

7. An Onsite Condition Was Not Visible in the Photos

Photos and measurements are useful, but they cannot always show:

• Hidden reinforcement
• Internal wiring
• The exact depth of an old cut-out
• Internal damage
• Uneven door construction
• Small clearance differences

This is why final compatibility may still need to be confirmed onsite.

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How Interlock Reduces the Risk Before Installation

Interlock does not begin by recommending a lock based only on its features or appearance.

We first ask customers to send clear photos of the entrance.

These normally include:

1. The front of the existing lock
2. The back of the existing lock
3. The side or edge of the door
4. The strike area
5. The full doorway

Read the full guide: Five Photos We Need Before Recommending a Digital Lock.

We May Request Measurements

If the photos show a possible compatibility concern, we may request measurements such as:

• Door-to-gate clearance
• Distance from the door edge to an existing handlebar
• Door-to-frame gap
• Door thickness

Read: How to Measure Your Door and Gate for a Digital Lock.

Experience Helps Us Identify Higher-Risk Installations

After reviewing many entrance types, our team can often identify when a selected model:

• Should fit normally
• May require closer checking
• Has a possible clearance issue
• May not cover an existing cut-out
• Should have a backup option prepared

This does not eliminate every possible onsite surprise, but it reduces unnecessary risk.

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Why Might Interlock Discuss a Backup Lock Beforehand?

Sometimes the preferred lock appears likely to fit, but the photos or measurements show an area of uncertainty.

Rather than waiting until the appointment to introduce a completely new option, Interlock may discuss a backup model with the customer beforehand.

The Backup Is Not Automatically Installed

The backup lock is an alternative option in case the preferred model cannot be installed safely or properly.

The process is usually:

1. Discuss the customer’s preferred model.
2. Explain the possible compatibility concern.
3. Recommend a suitable backup model.
4. Explain any feature or price differences.
5. Bring or prepare the agreed option for the appointment where practical.
6. Assess the actual entrance onsite.

The preferred model remains the first choice where it can be installed properly.

Why the Backup Model May Be Different

The alternative may have:

• A narrower lock body
• A different handle design
• A different mortise
• Better clearance for the gate
• A shape that covers the existing cut-out more effectively
• A mounting design better suited to the entrance

The backup is selected for physical compatibility, not simply because it is more expensive or easier to sell.

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What Happens During the Onsite Appointment?

Step 1: The Installer Reviews the Actual Entrance

The installer checks:

• The existing lock
• The cut-out and mounting area
• The door or gate condition
• The strike and frame
• The available handle clearance
• The distance between the door and gate

Step 2: The Preferred Lock Is Assessed

The installer confirms whether the preferred model can be installed securely and operate correctly.

This may involve checking:

• Whether the lock bodies fit
• Whether the handle can move freely
• Whether the mortise can be positioned correctly
• Whether the old holes can be covered
• Whether the bolts can align with the strike

Step 3: The Installer Explains Any Compatibility Problem

If the preferred model is unsuitable, the installer should explain the reason.

For example:

• The lock body is too wide
• The handle will hit the gate
• The old cut-out cannot be covered safely
• The door edge is too narrow
• The frame cannot receive the selected mortise properly

Step 4: The Backup Lock Is Assessed

If a backup model was discussed, the installer checks whether that model can fit the entrance correctly.

Step 5: The Customer Is Informed Before Proceeding

The customer is told:

• Which lock can be installed
• How it differs from the original choice
• Whether the price is higher or lower
• Whether any agreed additional work is required

Step 6: Installation Continues Only After Agreement

The new option and final price should be agreed before installation proceeds.

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What Happens If the Backup Lock Costs More or Less?

A compatible alternative may be priced differently from the original model.

The backup may:

• Cost more
• Cost less
• Be priced the same

Interlock will explain the difference clearly before proceeding.

If the New Model Costs More

The additional amount will be communicated and must be agreed before installation.

The customer should understand:

• Which model is being installed
• Why it is more suitable
• Its important feature differences
• The revised total price

If the New Model Costs Less

The lower price will also be communicated.

The customer should not be charged the original higher price for a lower-priced replacement model.

No Additional Cost After the Final Price Is Agreed

Once the new model, installation scope and final price are agreed, there should be no unexpected additional charge added afterwards.

If another issue is discovered that changes the agreed work, it should be explained before that additional work proceeds.

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What Does No-Fit, No-Fee Mean?

Interlock’s no-fit, no-fee approach protects customers when an approved installation cannot proceed because no suitable digital lock can be installed.

If:

• The preferred lock cannot fit
• The prepared backup lock also cannot fit
• No other suitable option is available
• The installation does not proceed

Then no fees are charged.

You Pay When the Installation Proceeds

The purpose of the policy is to avoid charging the customer for a lock installation that could not be completed.

If a compatible alternative is found and the customer agrees to proceed, the agreed price for that model applies.

What If There Is No Backup Model?

If no backup was prepared, Interlock may:

• Recommend another compatible model
• Explain what additional information is needed
• Arrange a different option where appropriate
• Confirm that no suitable lock is available

If no compatible solution can be installed, no fees are charged.

No Pressure to Accept a Different Lock

The customer is not required to accept an alternative simply because the installer is onsite.

The alternative should still suit the customer’s needs and agreed budget.

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What Should Customers Send Before the Appointment?

A better pre-installation assessment begins with complete information.

Send the Five Entrance Photos

1. Front of the existing lock
2. Back of the existing lock
3. Side or door-edge view
4. Strike area
5. Full doorway

Send the Requested Measurements

Depending on the entrance, this may include:

• Door-to-gate clearance
• Distance from the door edge to a handlebar
• Door-to-frame gap
• Door thickness

Show Previous Damage or Modifications (if possible)

Do not hide:

• Old drill holes
• Large cut-outs
• Cracked wood
• Loose metalwork
• An uneven door or gate

Clear information helps us prepare a more suitable recommendation and backup option.

Tell Us Which Features Matter

Let Interlock know whether your household needs:

• Fingerprint access
• Facial recognition
• Palm vein recognition
• PIN or card access
• App control
• Camera viewing
• Door-and-gate synchronisation

A backup lock should not only fit physically. It should also meet the important needs of the household.

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Common Installation Scenarios

Scenario 1: The Preferred Lock Fits Normally

The installer confirms the entrance and proceeds with the selected lock at the agreed price.

Scenario 2: The Preferred Lock Does Not Fit, but the Backup Does

The installer explains the compatibility issue and confirms that the backup model is suitable.

The customer reviews:

• The backup model
• The feature differences
• The final price

Installation proceeds after the customer agrees.

Scenario 3: The Alternative Lock Is Cheaper

The lower price is communicated, and the customer pays the agreed price for the installed model.

Scenario 4: The Alternative Lock Is More Expensive

The reason and additional cost are explained before installation.

The customer may choose whether to proceed.

Scenario 5: No Suitable Lock Can Be Installed

The installer explains why the available options are unsuitable.

The installation does not proceed, and no fees are charged.

Scenario 6: The Door or Gate Needs Repair First

The lock itself may fit, but the door, gate or frame may require adjustment or repair before a safe installation can be completed.

Interlock will explain the issue and the next step rather than forcing the installation to continue.

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Interlock’s Installation Process at a Glance

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Frequently Asked Questions

Can every digital lock fit every door?

No. Compatibility depends on the lock dimensions, existing cut-out, door material, frame, strike, handles and available clearance.

How does Interlock check whether a lock can fit?

We review the front, back, side, strike and full-doorway photos. We may also request relevant measurements.

Can photos guarantee that the lock will fit?

Photos provide a useful initial assessment, but final compatibility may depend on hidden or small onsite conditions.

Why would Interlock recommend a backup lock?

A backup may be discussed when the photos suggest that the preferred model has a possible compatibility concern.

Will Interlock try the preferred model first?

The preferred model remains the first choice where it can be installed properly. The installer will confirm its suitability onsite.

Will the backup lock be installed automatically?

No. The installer will explain the alternative, feature differences and price before proceeding.

What if the backup lock costs more?

The additional cost will be communicated clearly and requires the customer’s agreement before installation.

What if the backup lock costs less?

The lower price will be communicated, and the agreed price for the installed model applies.

Will there be additional charges after I agree to the new model?

No unexpected charge should be added after the model, installation scope and final price have been agreed.

What if I do not want the backup lock?

You are not required to accept an alternative model simply because the installer is onsite.

What if neither the original lock nor the backup fits?

Interlock may recommend another compatible option. If no suitable lock can be installed, no fees are charged.

What does no-fit, no-fee mean?

If no suitable digital lock can be installed and the installation does not proceed, you are not charged for the unsuccessful installation.

Will I be charged a trip fee if nothing fits?

Under Interlock’s no-fit, no-fee process for an approved installation that cannot proceed because no suitable model can be installed, no fees are charged.

Will the installer drill the door before checking compatibility?

The important fitment and clearance points should be assessed before permanent installation work proceeds.

What if the door or gate needs repair?

The installer may recommend that the entrance be adjusted or repaired before installing the digital lock.

Can I choose another installation date?

If another model or entrance repair is required, the next step can be discussed based on the available solution.

What photos should I send before booking?

Send the front, back, side, strike and full-doorway photos. Read Five Photos We Need Before Recommending a Digital Lock.

What measurements might be needed?

Depending on the entrance, Interlock may request door-to-gate clearance, door-edge-to-handlebar distance, door-to-frame gap or door thickness.

How do I send the photos and measurements?

Send them through the Interlock Singapore contact page together with your preferred features and budget.

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Concerned That a Digital Lock May Not Fit?

You do not need to select a model blindly and hope that the installer can make it work.

Start by sending Interlock:

1. The five entrance photos
2. Any requested measurements
3. Your preferred digital lock features
4. Your estimated budget

Our team will review the entrance and advise whether:

• The preferred lock is likely to fit
• A backup model should be prepared
• More measurements are needed
• Another lock would be more suitable

Photo and measurement review provides an initial compatibility assessment. Final installation suitability may depend on the existing cut-out, door or gate material, frame design, hidden reinforcement and physical conditions found onsite. Any alternative model and revised price will be communicated before installation proceeds.