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10 Best Under 100 Smart Locks of 2026

Buying Guide

Compatibility with your door and cylinder

Check whether the smart lock suits your door type (mortice, rim, euro cylinder, deadbolt) and will fit your door thickness and internal thumbturn. Some budget smart locks are retrofit units that attach to an existing thumbturn, while others replace the cylinder entirely - choose the approach that works for your rented or owned property.

Connectivity and remote access

Decide if you need Wi‑Fi for remote control or if Bluetooth alone is sufficient; many sub‑£100 models use Bluetooth and offer a paid or optional bridge for remote access. Consider which smart assistants (Alexa, Google Assistant, HomeKit) the lock supports if you want voice control or home‑automation integration.

Security, certifications and insurance

Look for locks that retain a high‑security mechanical cylinder (anti‑snap/anti‑drill) or have recognised third‑party tests such as Sold Secure or relevant EN standards. Check with your insurer if they require specific security ratings; convenience features are no substitute for solid physical protection.

Power, backup and reliability

Battery life, low‑battery warnings and a mechanical key override are crucial - budget smart locks often use AA batteries and claim many months of life but behaviour varies with frequent use. Make sure there is an easy fallback (physical key or inside thumbturn) and that replacements are readily available in the UK.

Features versus value

At under £100 you'll typically get Bluetooth connectivity, keypad entry and basic app control rather than full cloud features or robust integrations. Prioritise the features you actually need - guest codes, auto‑lock, activity logs - and buy from a reputable retailer (Argos, Amazon UK, John Lewis) offering returns and a warranty.

Frequently Asked Questions

What is the best smart lock under £100 in 2026?
There isn't a single 'best' model for everyone; the top choices under £100 in 2026 tend to be Bluetooth‑first locks with a keypad and strong mechanical security. Look for a well‑reviewed model from a recognised brand that fits your door type, offers long battery life and has the app features you need (guest codes, auto‑lock, activity logs).
Is a smart lock worth buying in the UK?
Smart locks are worth it if you value keyless access, temporary codes for guests and the convenience of remote locking (if you choose a Wi‑Fi model or add a bridge). Weigh convenience against security and insurance implications, and ensure the lock matches your door and meets any insurer requirements.
Which smart lock offers the best value for money under £100?
Best value usually means a reliable Bluetooth lock with a keypad, solid mechanical cylinder and a clear warranty from a known brand. Compare battery life, physical security, app stability and retailer support - these factors often matter more than a few pounds saved.
Yale vs August – which should I buy?
Yale and August both offer reputable smart‑lock ecosystems: Yale has strong UK presence and models made for British door standards, while August is well known for easy retrofit interior attachments. Under £100 you may find basic Yale keyless units or lower‑end retrofit options; pick the brand that fits your door, offers the features you need and has UK support.
Can I fit a smart lock myself or do I need a locksmith?
Many budget smart locks are designed for DIY installation and fit standard cylinders or thumbturns, but precise alignment and secure cylinder fitting matter for safety. If your door has an unusual lock, multipoint mechanism, or you need an insurer‑rated cylinder, a locksmith is recommended.
Will installing a smart lock affect my home insurance?
Potentially - insurers may require certain cylinder standards or evidence the lock doesn't weaken existing security. Check policy terms before fitting and keep receipts and manufacturer specifications; fitting an approved, high‑quality cylinder usually avoids issues.
Are cheap smart locks secure?
Budget smart locks can be secure if they pair a solid mechanical cylinder with sensible digital protections (firmware updates, secure app authentication). However, cheaper models may lack remote‑access features, regular firmware updates or strong integration, so prioritise well‑reviewed products from trusted brands.
Where can I buy smart locks under £100 in the UK?
Popular UK retailers include Amazon UK, Argos, Currys and John Lewis, plus specialist locksmith suppliers and the manufacturers' own websites. Buying from established retailers makes returns and warranty claims easier if you run into issues.
What is the best smart lock for a rented flat in 2026?
For rented flats, choose a non‑destructive retrofit model that attaches to the internal thumbturn and doesn't require cylinder replacement; these typically use Bluetooth, provide keypad or app access and allow temporary codes. Look for a unit with compact dimensions to fit UK thumbturns, a mechanical key fallback and good app reviews for reliability.
Is a Bluetooth‑only smart lock worth it in 2026?
Yes - Bluetooth‑only locks are worth it if you mainly need local keyless entry, guest codes and longer battery life without the cost of permanent Wi‑Fi. They lack native remote access unless you add an optional bridge, so choose Bluetooth if privacy and simplicity matter more than cloud features.
Yale basic keyless unit vs a budget Ultraloq/August retrofit – which should I buy?
Pick a Yale basic keyless unit if you want a product made for UK door standards and dealer support; choose an Ultraloq/August‑style retrofit if you prefer non‑destructive fitting to the internal thumbturn and easy removal when you move. Compare attributes: Yale often offers better cylinder options and UK compatibility, while retrofit models excel at simple installation and renter‑friendly behaviour.
Which smart lock is best value for money in the UK under £100?
Best value is a reliable Bluetooth lock with keypad, solid mechanical cylinder or strong retrofit fitting, and proven app performance; such models balance security and convenience without unnecessary cloud features. Prioritise recognised brands sold through UK retailers with a minimum one‑year warranty and clear replacement battery availability.

Our Methodology

Product Selection: Products are sourced via Amazon's Product Advertising API based on relevance, availability, and customer ratings.

Review Analysis: We use AI to analyze customer review trends, identify common themes, and summarize the key strengths and weaknesses of each product.

Scoring Independence: Our rankings and fit scores are generated algorithmically and are not influenced by commission rates or advertising relationships.

Affiliate Disclosure: We earn commissions from qualifying Amazon purchases made through our links at no additional cost to you.

Last updated: June 5, 2026

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