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Install a carbon-monoxide alarm.
Battery or mains, single or networked — fitted near every fuel-burning appliance, tested on the day.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Costs, timelines, pitfalls and the right questions to ask before any chimney sweep starts on carbon Monoxide Alarm.
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Four moves that separate a smooth job from a nightmare.
Wrong position
Too close to ceiling (CO is heavy, not light). At head height in same room as appliance.
Cheap alarm fails
Quality 10-year sealed battery. Cheap units fail before warranty.
Battery removal
Don't remove from "annoying" alarm. Sealed alarms tamper-resistant.
Lifetime expiry
All CO alarms replace every 10 years.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Sealed battery CO alarm10-year battery
£20–£50
Mains-powered CO alarmHard-wired
£50–£120
Premium digital displayLED reading
£80–£150
Smart CO alarm (Nest Protect)Phone notifications
£200–£300
Install labour (mains)Electrician
£40–£100
Multiple alarms (per house)2-3 typical
£40–£200
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
Infographic · VideoThe Chimney Sweep briefing.
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Chimney Sweep explained
Carbon monoxide alarms are mandatory in homes with combustion appliances since 2022. Sealed long-life batteries. Expect to pay £20–£100 per alarm for UK CO alarms.
What Does the Work Involve?
CO alarm purchased. Plugged into mains or sealed battery installed. Tested with manufacturer's button. Positioned per CO regulations: same room as combustion appliance, head-height. Replacement every 10 years.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Sealed battery CO alarm | 20 | 50 | 10-year battery |
| Mains-powered CO alarm | 50 | 120 | Hard-wired |
| Premium digital display | 80 | 150 | LED reading |
| Smart CO alarm (Nest Protect) | 200 | 300 | Phone notifications |
| Install labour (mains) | 40 | 100 | Electrician |
| Multiple alarms (per house) | 40 | 200 | 2-3 typical |
| Annual maintenance | 0 | 0 | Press test button |
How Long Does It Take?
Self-install: 5 minutes per alarm. Professional electrician: 30 minutes per hard-wired.
DIY or Professional?
Sealed battery DIY-friendly. Mains-powered electrician for Part P.
Choosing the Right Tradesperson
Smoke and CO alarm specialist. Quality brands: Kidde, FireAngel, Nest Protect.
UK Regulations
Smoke and Carbon Monoxide Alarm (England) Regulations 2022: mandatory in all residential properties with combustion appliances. Landlord responsibility ensures installation.
Common Problems
- Wrong position: Too close to ceiling (CO is heavy, not light). At head height in same room as appliance.
- Cheap alarm fails: Quality 10-year sealed battery. Cheap units fail before warranty.
- Battery removal: Don't remove from "annoying" alarm. Sealed alarms tamper-resistant.
- Lifetime expiry: All CO alarms replace every 10 years.
Frequently Asked Questions
Is CO alarm mandatory?
Yes — UK regulations 2022. All homes with combustion appliances (gas, wood, oil) require CO alarms.
Where to position?
Same room as combustion appliance. Head height. Not in dead corners. 1-3m from appliance.
Battery or mains?
Sealed battery: easier install, 10-year life. Mains: more reliable, professional install needed.
How often replace?
Every 10 years. Manufacturer date stamped on alarm.
What does alarm sound mean?
4 short beeps + pause: CO detected (evacuate, ventilate, call gas safe). 1 chirp every minute: battery low.
Where to buy?
B&Q, Wickes, Argos, Screwfix. Quality brand: Kidde, FireAngel. Premium: Nest Protect.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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