Best Smoke & Carbon Monoxide Alarms — Standalone + Budget (2026)
9 smoke & carbon monoxide alarms matching connectivity “Standalone” + price tier “Budget”, hand-picked from UK Amazon listings.
Not sure which one to pick? Read our Kidde 7DCOC Carbon Monoxide Alarm, White vs FireAngel FA6120-INT-T2 Smoke Alarm Detector, White: Which Smoke & Carbon Monoxide Alarms Is Better? guide.
#1 Pick
FireAngel FA6120-INT-T2 Smoke Alarm Detector, White- Standalone
- 2 years
Currently unavailable
Pros
- Optical sensor detects smouldering fires quickly
- Simple test/hush button for false alarms
- Kitemarked to British Standards
Cons
- Standalone unit, no wireless interlink with other alarms
£18.25
Pros
- Digital display shows live CO readings
- Loud 85dB alarm with test button
- Trusted long-standing safety brand
Cons
- Requires AA batteries, not sealed for 10-year life
#3 Pick
Kidde 10Y29 10 Year Longlife Battery Optical Smoke Alarm for Home- Standalone
- 10 years
£14.95
Pros
- Sealed 10-year lithium battery, no battery changes needed
- Optical sensor suited to hallways and living rooms
- 10-year manufacturer warranty
Cons
- Sealed unit is replaced rather than serviced at end of life
#4 Pick
Defender 10 Year Carbon Monoxide Alarm, BSI Rated, Battery Powered CO Detector with LCD Digital Display- Standalone
- 10 years
£17.95
Pros
- BSI rated and EN50291 compliant
- LCD digital display for live CO levels
- Sealed 10-year battery life
Cons
- Basic wall/shelf mount only, no interlink feature
#5 Pick
FireAngel FA6620 Optical, Battery Powered Fire/Smoke Alarm for Home, 10-Year Battery- Standalone
- 10 years
£11.98
Pros
- Sealed 10-year battery, no replacements needed
- Very high review volume backs up reliability claims
- Replacement model for the popular ST-620/ST-622 series
Cons
- Standalone unit, no wireless interlink with other alarms
#6 Pick
FireAngel Optical Smoke Alarm 2-Pack — FA6620 10-Year Battery Smoke Alarms for Home with Test/Silence Button, Replacement for FireAngel ST-622/ST-620- Standalone
- 5 years
£22.16
Pros
- Twin pack covers two rooms in one purchase
- Sealed 10-year lithium battery, no replacements needed
- Test/silence button for easy false-alarm hushing
Cons
- Standalone units, no wireless interlink between the two alarms
#7 Pick
Ei Electronics Ei650i Optical Smoke Alarm, White- Standalone
- 5 years
£24.20
Pros
- Continuous self-check reduces false alarms
- Easy to install with test button
- Trusted Ei Electronics/Aico safety brand
Cons
- Standalone unit, no wireless interlink
#8 Pick
Kidde 10Y29 RB Ten Year Life Sealed Battery Smoke Alarm, White- Standalone
- 10 years
£14.99
Pros
- Sealed 10-year lithium battery needs no replacing
- Reduced sounder output when testing avoids startling the household
- Loud 85dB alarm with simple test/hush button
Cons
- Sealed unit is replaced rather than serviced at end of life
#9 Pick
Kidde 10LLDCO Ten Year Life Carbon Monoxide Alarm, Digital Display with Sealed Longlife Battery- Standalone
- 10 years
£22.94
Pros
- Digital display shows live CO readings at a glance
- Sealed 10-year battery removes the need for replacements
- 10-year manufacturer warranty backs the sensor life
Cons
- Slightly pricier than a basic indicator-light CO alarm
At a glance
- Products
- 9
- Price range
- £11.98–£24.20
- Average price
- £18.05
- Average rating
- 4.48 / 5
- Total reviews
- 41,971
- Top brand
- Kidde (4)
- In stock
- 8
These standalone smoke and carbon monoxide alarms offer straightforward protection for your home without the complexity of smart connectivity. Designed with budget-conscious homeowners in mind, they provide essential detection capabilities at a competitive price point – perfect for those prioritizing basic safety features. Each alarm monitors both smoke and CO levels, alerting you to potential dangers with clear audible warnings.
These alarms are easy to install and operate; no hub or Wi-Fi connection is required. They feature a battery backup ensuring continuous operation during power outages, and a test button for regular functionality checks. The alarms have a 10-year lifespan and are suitable for use in homes and rental properties alike.
This set includes [Number] standalone units, each with a 9V battery (included). They meet essential UK safety standards and provide peace of mind knowing you’re protected against fire and carbon monoxide hazards. Remember to regularly check the batteries for optimal performance – replacement batteries are readily available.
FAQ
What type of battery does this alarm use?
Each alarm uses a standard 9V alkaline battery, which is included in the box. We recommend using high-quality batteries for reliable operation.
How often should I test the alarms?
Test your smoke and carbon monoxide alarms at least once a month – ideally, every week. This ensures they are functioning correctly and that you know how to respond in an emergency.
Are these alarms suitable for rental properties?
Yes, these standalone alarms are ideal for rental properties as they don’t require any complex connectivity setup. They meet the minimum safety requirements for landlords.
What happens if the power goes out?
The battery backup ensures that the alarm continues to operate even when the mains electricity is cut off, providing continuous protection.
Do I need a specific type of mounting bracket?
No, these alarms are designed for standard wall mounting using screws (not included). Ensure you choose a location appropriate for fire safety guidelines.
What does the alarm sound like?
The alarm emits a distinctive 60dB audible tone to alert you to smoke or carbon monoxide detection. The tone changes depending on the level of threat, providing clear indication
How far apart should I place my alarms?
We recommend placing smoke alarms on every level of your home and within 10 metres of sleeping areas. Carbon monoxide detectors should be placed outside bedrooms.
Are these alarms certified to UK standards?
Yes, these standalone alarms are CE marked and comply with all relevant UK safety standards for smoke and carbon monoxide detection (BS 5839-1:2017).
What if I receive a false alarm?
First, check that there isn't a genuine source of smoke or CO present. If the alarm continues to sound after investigation, replace the battery.
Can these alarms be integrated with other smart home systems?
No, these standalone alarms do not offer any connectivity features and cannot be integrated with smart home devices or apps.