Smart locks are the category where returns happen most, and almost always for the same reason — the lock did not fit the door. This page shows you the three measurements that decide it, honest battery expectations for Bangladeshi conditions, and the six mistakes that lead to a locksmith at midnight.
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Measure before buying. A lock that does not fit is not a warranty claim.
The headline product is rarely more than half the installed cost. These are the parts that get left out of budgets.
Matched to door thickness, backset and material. Not universal.
Key cylinder or emergency power port. Never buy a lock without one.
Usually 4 or 8 AA. Keep a spare set in the house, not in a shop.
Needed for remote unlock and access logs. Bluetooth-only locks work at the door only.
For family, staff or tenants who will not use fingerprint.
Thin or hollow doors flex, which misaligns the bolt over time.
A smart lock assumes the door closes. If it does not, auto-lock will not engage.
Glass doors and steel doors in particular are not DIY fittings.
The honest trade-offs.
| Consideration | Keypad | Fingerprint | RFID Card | App / Wi-Fi |
|---|---|---|---|---|
| Typical price | ৳8.5k–15k | ৳15k–35k | ৳12k–22k | ৳22k–55k |
| Speed to open | ~3 sec | ~1 sec | ~1 sec | 2–5 sec |
| Works with no power or network | Yes | Yes | Yes | Local only |
| Remote / temporary access | No | No | No | Yes |
| Access log | Limited | Yes | Yes | Yes |
| Suits elderly users | Yes | Sometimes poor | Yes | Poor |
| Best for | Interior, low traffic | Family homes | Offices, tenants | Rentals, remote access |
Measure thickness, backset and mortise. The three numbers that decide fit. Everything else is preference.
Identify the door material honestly. Aluminium-framed and frameless glass doors need specific bodies. A mortise lock cannot be adapted to glass.
Check the door is not warped. A door that binds in its frame will misalign the bolt, and the motor will strain and eventually fail.
Wi-Fi signal at the door, not the router. Front doors are often the weakest signal point in a house. Test before specifying an app-controlled lock.
Decide where the override key lives. Not inside the house. That is the one place it cannot help you.
Glass doors need drilling before glazing. Where possible. Drilling installed glass is possible but risky and expensive.
Batteries are the only real running cost. Expect 6–10 months in Bangladeshi heat and humidity rather than the year commonly quoted. Locks with a low-battery warning are worth the difference; locks without one fail without notice.
Cards and fobs, where used, get lost. In a shared office or rental, budget replacements.
Motor and bolt wear is minimal on a well-aligned door and significant on a warped one. Door alignment is the variable that decides lock lifespan.
No subscription on locks we supply. Some international app-based brands charge for cloud features — confirm before buying.
The cost nobody plans for: a locksmith at midnight because the batteries died and the override key was inside the house. Every lock we supply has an override. Decide where it lives on day one.
Every one has cost a real project real money.
The leading cause of returns in this category. A lock that does not fit is not a warranty issue.
Do this: Measure thickness, backset and mortise. Send us a photo — we confirm fit before you pay.
Frameless glass needs a purpose-built body. It cannot be adapted, and the glass may need drilling.
Do this: Identify the door material at enquiry, not at installation.
Manufacturer figures assume moderate use in temperate conditions. Bangladeshi heat and humidity shorten it materially.
Do this: Plan for 6–10 months and choose a lock with a low-battery warning.
It is the one place it cannot help you when the batteries die.
Do this: Decide the location on installation day. A trusted neighbour or a car is better than a drawer inside.
Worn fingerprints read poorly. A lock that fails daily for one person becomes a household problem.
Do this: Specify card or keypad as an equal backup, not an afterthought.
A warped or badly hung door misaligns the bolt. The motor strains and eventually fails, and it looks like a lock fault.
Do this: Fix the door first. A smart lock cannot compensate for bad hanging.
Specifications, models and pricing sit on the product pages.
Rules we apply on every installation. Share this with your installer.
These decide whether a lock fits.
Family: fingerprint. Offices: card or PIN with app revocation. Rentals: temporary codes.
The emergency key is useless if it is locked inside.
Every lock warns, but warnings get ignored.
A mortise lock cannot be fitted to frameless glass.
If the only admin fingerprint belongs to one person, a staff change locks you out of the settings.
Three questions decide the lock. The fourth decides whether the client is happy in two years.
It is the single most common return in this category.
App-based consumer locks depend on a phone, an account and a network. They do not produce a proper audit trail and they fail awkwardly when staff leave.
When that person is unavailable, nobody can add or remove a user. Always enrol two.
Phones die, accounts get locked, networks drop. There must be a physical fallback on every door.
Wet fingers do not read. Provide a card or PIN alternative on any door exposed to weather.
A lock is a security device until its battery dies, at which point it is a door that will not open.
Door material and who needs to open it drive every other decision.
Glass needs a lock built for it. A standard mortise body will not fit and a bracket retrofit rarely looks right.
Every product above is one DigiMark Solution imports, stocks and warrants. Pricing is quotation-based and depends on quantity and configuration — request a quotation or ask on WhatsApp.
What to state so you get comparable quotations.
| Sector | What to specify | Typical scale | The clause bidders exploit |
|---|---|---|---|
| Hotel / resort | Front-desk encoder; per-door audit trail; check-out auto-invalidation; master and emergency card hierarchy | 20–300 rooms | Specify the encoder and software, not only the locks — it is frequently omitted from quotations |
| Corporate office | Card-based; integration with the existing access control system; audit trail retention | 10–100 doors | State whether the locks must appear in the same software as the door access system |
| Apartment building | Per-unit independence; mechanical override; resident handover process | Per unit | Decide who holds the master credential before handover, and write it down |
| Retail / warehouse | Tamper resistance; restricted key control; shared-asset access | Varies | Keyless removes the copied-key problem, which is the actual reason most retailers change |
| Residential | Fingerprint plus PIN plus key; simple enrolment; two administrators | 1–3 doors | The handover briefing matters more than the specification here |
Three measurements decide it: door thickness, backset (door edge to handle centre) and mortise dimensions. Most locks handle 35–55 mm thickness and a 55–70 mm backset. Door material matters too — wooden, steel, aluminium and frameless glass each need different lock bodies. Send us a photo and the measurements and we confirm fit before you order.
Expect 6–10 months on typical household use, rather than the year usually quoted. Manufacturer figures assume temperate conditions; heat and humidity shorten battery life materially. Choose a lock with a low-battery warning — locks without one fail with no notice.
Every lock we supply has a mechanical override — either a key cylinder or an emergency power port that accepts a power bank. Never buy a smart lock without one. Equally important: keep the override key somewhere other than inside the house, which is the one place it cannot help you.
Yes, but it needs a lock body designed specifically for glass — a standard mortise lock cannot be adapted. Glass door locks run ৳18,000–45,000 and installation often requires drilling, which is far safer done before the glass is fitted.
For most households, yes. But elderly users and manual workers often have worn fingerprints that read poorly, and a lock that fails daily for one family member becomes a daily argument. If the household includes elderly parents, specify card or keypad as an equal backup rather than an afterthought.
Only for remote unlock, temporary guest codes and access logs viewed away from home. Bluetooth-only locks work at the door without any network. If you do want Wi-Fi features, test the signal at the front door rather than at the router — front doors are often the weakest point in a house.
Prices and figures as of 2026. Confirm with a quotation.
Free site survey across Dhaka and Chattogram. Our engineers confirm the design before anything is quoted.