Intermediate

Fire Safety Home: Smoke Detectors and Standards

16/04/2026 13 min read

A house fire starts every two minutes in France — 250,000 per year, with 800 deaths. The majority of victims die at night, asphyxiated in their sleep. The good news: a smoke alarm reduces the risk of death by a factor of three. In self-build, you have a rare advantage — you can integrate fire safety from the design stage, not as an afterthought. This article covers mandatory and recommended detectors, standards to comply with, optimal positioning, the evacuation plan, and supplementary equipment.

Smoke alarms: a legal requirement

Since the Morange Act of 9 March 2010 and its implementing decree (2015), every dwelling must be fitted with at least one smoke alarm (DAAF — Détecteur Avertisseur Autonome de Fumée). In new construction, it is the project owner — you — who must install it before moving in.

What the law requires (minimum)

1 smoke alarm minimum per dwelling (article R. 129-12 of the French Construction Code)
Mandatory standard: NF EN 14604 with CE marking
Powered by a replaceable battery or a 10-year sealed lithium battery (hard-wired not mandatory in residential)
Preferably installed in the hallway or landing giving access to bedrooms

What is recommended (in practice)

The legal minimum is insufficient. A single smoke alarm in the hallway will not wake you if the fire starts in the closed bedroom where you are sleeping. Professional recommendation:

Zone	Recommended alarm	Why
Each bedroom	1 smoke alarm	You sleep with the door closed — the hallway is not enough
Hallway / landing	1 alarm per floor	Detects spreading smoke
Living room	1 smoke alarm	Sofa, curtains, electronics = combustibles
Converted loft	1 smoke alarm	Smoke rises: this zone is reached fastest
Stairwell	1 alarm at the top	Natural draw point for smoke

Warning — Never place a smoke alarm in the kitchen or in the bathroom. Cooking steam and water vapour trigger false alarms, which leads people to disable the detector — the worst possible scenario. For the kitchen, use a heat detector (see below).

Choosing the right smoke alarm

Not all smoke alarms are equal. Here are the criteria that matter:

Criterion	Budget	Recommended
Standard	NF EN 14604 (mandatory)	NF 292 (voluntary NF mark, more demanding)
Battery	9V (1-2 years)	Sealed lithium 10 years
Sound signal	85 dB at 3 m	85 dB + interconnection (all sound together)
Unit price	€5–10	€15–30
Service life	5 years	10 years (end of life = end of battery)

Tip — Invest in smoke alarms with a 10-year lithium battery. The extra cost (€15 vs €5) saves you replacing batteries every year and eliminates the risk of a silent alarm because the battery has died. Over 10 years, it is also cheaper (€15 vs €5 × 5 batteries = €25).

Interconnected alarms: real safety

Interconnected smoke alarms (wired or radio) trigger all detectors when just one detects smoke. That is the difference between hearing the alarm in the room on fire and hearing it throughout the house.

Wired: 2-core cable between all smoke alarms. Plan the cabling during the second-fix stage (run a cable in a star or loop from a central point). Cost: ~€10/detector + cabling.
Radio (wireless): each alarm communicates by radio waves. More expensive (€30–50/unit) but no cable to run. Typical range: 30 to 50 m.

In self-build, you have the opportunity to run cables through conduit during the second-fix stage. This is the ideal time to install a wired interconnected network — it will be invisible and reliable.

Best practice — Take advantage of running electrical conduit to pull a 2-core cable between smoke alarm positions. Marginal cost (€10 of cable for the whole house), but you move from a standalone detector to a whole-house detection system. This is the recommendation of the fire brigade.

Detector positioning

A badly positioned smoke alarm detects nothing — or sounds for no reason. Mounting position is just as important as the detector itself.

Positioning rules

On the ceiling, at the centre of the room or at least 30 cm from a wall/corner (aerodynamic dead zone in corners)
Not above a heat source (radiator, recessed spotlight, chimney flue)
Not in a draught (facing a mechanical ventilation outlet, a window, a front door)
At the top of stairwells (smoke rises — this is where it arrives first)
In high-risk rooms: living room (candles, multiple sockets), bedrooms (charging devices)

Mounting height

Flat ceiling: directly on the ceiling, screw or stick (magnetic adhesive pad = easier for replacement)
Cathedral / sloped ceiling: no more than 50 cm below the highest point (smoke stagnates at the peak in a thin layer and may miss a detector fixed right at the top)
Never install on a wall (even high up): smoke stratifies at the ceiling and does not descend towards the wall

Question

Heat detectors and CO detectors

The optical smoke alarm does not cover all risks. Two other detectors complete the protection.

Heat detector (kitchen)

A heat detector triggers the alarm when the ambient temperature exceeds a threshold (57°C fixed, or rapid rise > 12°C/min). It does not react to steam or cooking fumes.

Standard: EN 54-5
Location: on the kitchen ceiling, more than 50 cm from the extractor hood
Price: €15 to €25
Interconnectable with wired smoke alarms

Tip — In self-build, install a heat detector in the kitchen rather than a smoke alarm. A kitchen fire (oil, deep fryer, oven) first generates heat, then smoke — the heat detector responds faster and does not sound when you are making pancakes.

Carbon monoxide (CO) detector

CO is an odourless, colourless and lethal gas. It kills 100 people per year in France. Every dwelling with a combustion appliance (gas/oil boiler, wood stove, insert, gas water heater) should be fitted with a CO detector — it is not yet legally mandatory, but is strongly recommended by the fire service and will soon be required by regulation.

Location	Rule
Room with boiler/stove	1 CO detector at 1 to 3 m from the appliance, at breathing height (1.5 m from the floor)
Attached garage	1 CO detector if the garage communicates with the dwelling
Bedroom above a boiler room	1 CO detector in the bedroom

Standard: NF EN 50291 with CE marking
Price: €20 to €40
Service life: 7 to 10 years depending on the model (electrochemical cell)

Evacuation plan and emergency exits

Detection is useless if you do not know how to get out. In new construction, you can design the circulation routes to facilitate evacuation.

Design principles

Minimum two exits per habitable floor: front door + accessible patio door or French window (no key required)
Clear hallway: minimum width 90 cm (ideal 1 m), no bulky storage in circulation areas
Bedroom doors: opening direction towards the hallway (facilitates escape)
Bedroom windows: at least one window per bedroom large enough to climb through in an emergency (minimum 0.60 m × 0.80 m, sill height < 1.20 m)

The family evacuation plan

Even in a detached house, a displayed plan makes a difference when panic sets in.

Draw the plan of each floor with the exits (doors, usable windows)
Mark 2 escape routes from each bedroom to the outside (one primary, one secondary)
Define an assembly point outside (gate, tree, letterbox — somewhere you can count the occupants)
Practise the drill twice a year with the whole family (at night, eyes closed in the hallway — that is the reality of a night-time fire)

flowchart TD A{Smoke alarm triggered} -->|Night| B[Wake everyone up] A -->|Day| C[Check the source] B --> D[Touch the door - hot ?] C -->|Visible smoke| D C -->|False alarm| Z[Ventilate and reset] D -->|Yes door hot| E[DO NOT OPEN - use emergency exit] D -->|No| F[Open carefully] F -->|Smoke in hallway| G[Crawl along floor - get out] F -->|Hallway clear| H[Evacuate via main route] E --> I[Window or balcony - call 18] G --> J[Assembly point - call 18] H --> J style A fill:#CD212A,stroke:#CD212A,color:#fff style B fill:#F58220,stroke:#F58220,color:#fff style C fill:#0F4C81,stroke:#0F4C81,color:#fff style D fill:#F58220,stroke:#F58220,color:#fff style E fill:#CD212A,stroke:#CD212A,color:#fff style F fill:#0F4C81,stroke:#0F4C81,color:#fff style G fill:#F58220,stroke:#F58220,color:#fff style H fill:#56C6A9,stroke:#56C6A9,color:#fff style I fill:#CD212A,stroke:#CD212A,color:#fff style J fill:#56C6A9,stroke:#56C6A9,color:#fff style Z fill:#FDFCF9,stroke:#C67A3C,color:#0F4C81

Fire extinguishers and fire blankets

Conseil

Fire extinguishers are not mandatory in a detached house, but a well-placed extinguisher can put out a fire starting in 30 seconds — before it becomes uncontrollable.

Which extinguisher to choose

Type	Fire class	Home use	Price
Dry powder ABC 6 kg	Solids, liquids, gases	General purpose — garage, workshop, entrance	€25–40
CO2 2 kg	Electrical fires, liquids	Electrical panel, office, server	€40–60
Water mist 6 L	Solids, liquids	Living room, bedrooms (no residue)	€30–50
Fire blanket	Oil, deep fryer, clothing	Kitchen (essential)	€10–20

Warning — Never throw water on an oil or deep-fryer fire. Water instantly vaporises and projects the burning oil — the result is an explosion. Use a fire blanket: place it over the pan to smother the flames, and leave to cool for 30 minutes without lifting it.

Where to place extinguishers

Kitchen: fire blanket within reach (hung on the wall, not in a drawer) + dry powder ABC extinguisher at the kitchen entrance (not at the back — you must be able to grab it while retreating)
Garage / workshop: dry powder ABC extinguisher near the access door
Main entrance: dry powder ABC extinguisher if only one — this is the most strategic location
Electrical panel: CO2 extinguisher nearby (CO2 does not damage electronics)

Extinguisher maintenance

Visual check: every 6 months (needle in the green zone, pin in place, hose not cracked)
Professional service: every year by a certified technician (label with inspection date)
Service life: 20 years maximum, but most are replaced between 10 and 15 years
Training: learn how to use an extinguisher BEFORE you need it — 5 minutes of instruction is enough (PASS technique: Pull the pin, Aim at the base, Squeeze the handle, Sweep side to side)

Fire standards in new construction

In a new detached house, fire standards are defined by the French Construction and Housing Code (articles R. 111-1 et seq.) and the orders of 31 January 1986. Here is what directly concerns you.

Fire resistance of materials

Element	Minimum requirement	What it means
Load-bearing wall	SF 1/4h (15 min)	Holds 15 min before collapse
Floor	SF 1/4h	Concrete or timber floor with protection
Entrance door	CF 1/2h (30-min fire rating)	Fire-rated door (if block of flats — not mandatory for detached)
Integrated garage door	CF 1/2h or PF 1/2h	Fire-rated or flame-barrier door if garage connects to dwelling
Partition walls	Not regulated in detached	But recommended: plasterboard = 15 min protection

Tip — If your garage connects to the house (internal door), fit a 30-min fire-rated door (metal or solid timber door frame with intumescent seal). This is a critical point frequently overlooked by self-builders. A vehicle or storage fire in the garage can invade the house within minutes without this door.

Electrical installations and fire

The electrical installation is the leading cause of domestic fire (25% of cases). Standard NF C 15-100 imposes protections that contribute to fire safety:

30 mA residual current device (RCD) on all circuits (detects current leakage before overheating)
No daisy-chained extension leads — plan sufficient sockets from the design stage (6 to 8 per living room)
Self-extinguishing conduit (ICTA — Isolant Cintrable Transversalement Annelé): electrical conduit is self-extinguishing (does not propagate fire)
Dedicated electrical panel area (ETEL): a dedicated, ventilated, unobstructed space for the consumer unit

For everything you need to know about compliant electrical installation, see our articles in the electrical category.

Costly mistakes to avoid

Installing a single smoke alarm for the whole house — That is the legal minimum, not actual safety. A fire in a closed bedroom will not be detected by the hallway alarm before it is too late.
Putting a smoke alarm in the kitchen — Daily false alarms → you end up taking it down → you no longer have a detector.
Forgetting the CO detector with a wood stove — CO is undetectable without a device. You smell nothing, you fall asleep, you do not wake up.
Storing extinguishers at the back of the garage — In a garage fire, you cannot access them. The extinguisher must be on the escape route, not at the heart of the danger.
Never testing smoke alarms — The test button exists for a reason: a battery can die silently. Monthly test, 3 seconds, it can save a life.
No fire-rated door between garage and house — A garage contains vehicles, petrol, paints, solvents, cardboard: it is a time bomb. 30 minutes of fire-rated protection is the time needed to evacuate.