Survey finding
Missing or inadequate fire alarms: what to do
Smoke and fire alarm findings are routine on UK surveys. This page covers what current Building Regs require and the cost of bringing the property up to standard.
Last updated: 6 May 2026. Editorially reviewed: 20 May 2026.
Finding
Missing or inadequate fire alarms
What this usually means
Building Regulations Part B (England) requires smoke alarms on each storey of a dwelling and a heat alarm in the kitchen. From October 2022, Scotland's Tolerable Standard requires interlinked smoke alarms in every living room and circulation space, plus a heat alarm in the kitchen. Carbon monoxide alarms are required wherever a combustion appliance (boiler, stove) is installed.
Why it matters
Missing or out-of-date smoke alarms are not a defect of the building but indicate the safety culture of the previous owner. Lenders and insurers don't refuse on alarms, but the cost of full retrofit is small and worth doing on completion.
Ask your surveyor
- Check:Are smoke alarms fitted on each storey?
- Check:Is there a heat alarm in the kitchen?
Ask the seller
- Check:When were the smoke alarms last tested or replaced?
Next steps
- •Get two written quotes from local trades before negotiating with the seller.
- •Speak to your mortgage broker before exchanging if the finding affects mortgageability.
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What you need to know
Severity
Maintenance item. Worth quoting and including in negotiation.
Typical cost to fix
Mains-wired interlinked smoke and heat alarms (3-bed semi): £200–£500 supply and fit. Battery-only alarms: £40–£80 for a full set. Carbon monoxide alarm: £15–£40 per unit.
Mortgage impact
Not a mortgage issue.
Insurance impact
Some insurers ask whether smoke alarms are fitted; rare for it to affect premium materially.
When to pull out
Never.
When to renegotiate, and by how much
Not a price-renegotiation item. Install on completion.
Thinking of pulling out or renegotiating? What to do after a bad survey
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Fire safety: flat and leasehold issues , often sits near missing or inadequate fire alarms on a survey and is the next thing to check.
How MyPropertyScan produces this guide, and what it is not
Published by MyPropertyScan and written by Ziad Nasr, who is accountable for its accuracy. No page here is written or reviewed by a chartered surveyor, conveyancer or regulated adviser, and we do not claim otherwise.
This page is not:
- Chartered surveying — we do not inspect properties or produce RICS Home Survey reports
- Legal advice — we do not act as conveyancers or advise on title, tenure or contracts
- Mortgage or insurance advice — we are not regulated by the FCA and give no recommendations
Figures and process steps come from the published UK datasets and standards listed on this page, not from professional practice. Pages are updated when source coverage, survey cost assumptions, or lender and legal requirements materially change. Dataset limitations are set out on the methodology page.
Spotted something out of date or wrong? Email hello@mypropertyscan.com and we will correct it and change the update date.
Sources used
We use UK public and specialist sources where they are available. Public datasets can be incomplete, delayed, or missing for some addresses. Treat them as a starting point, not as a replacement for professional advice.
Source standard: preference goes to official government datasets, statutory bodies, professional standards, and primary dataset publishers. We cite the source family on the page and explain coverage limits rather than filling gaps with unsupported estimates.
- Professional standard: RICS Home Survey StandardRICS standard for condition-based residential surveys in the UK.
- Learn more from: RICS consumer guide to surveysConsumer-facing guide to survey types and when each level is appropriate.
- Official guidance: GOV.UK buying or selling your homeGovernment overview of the home buying and selling process.