France's Minimum Ceiling Height: the 2.20 m Décence Rule

The requirement

In practice, the minimum is 2.20 m for a main room (pièce principale). That comes from Article 4 of Décret n°2002-120 du 30 janvier 2002, the décence (decent-housing) rule. If the height is under 2.20 m, the room can pass instead with a habitable volume of 20 m³. That rental test is not a full new-build check.

This “logement décent” (décence) rule is housing law, not a permit-stage design clause. It says when a dwelling is decent enough to rent out. Strictly, it is a tenancy and habitability floor. It is not a technical new-build clause, the way a Building Regs Approved Document might set one. Check new-build, local health and planning rules separately. This rental decency test alone does not approve a new dwelling.

Décret 2002-120 · art. 4 (décence)

Room size

Article 4 sets two alternatives for at least one main room: 9 m² habitable surface with 2.20 m height, or 20 m³ habitable volume. Do not require the 9 m² test as well as the volume alternative. This decency floor bites on one main room only. The CCH sets no minimum floor area for every room in a house.

New-build area and volume

CCH R156-1 separately sets dwelling area and volume by planned occupants: The first four each need 14 m² and 33 m³. Each extra person needs 10 m² and 23 m³. Its habitable-area method excludes parts below 1.80 m. These are dwelling totals, not a rule that every bedroom must be 14 m². Check the article’s scope and any local health or planning rules.

Read CCH R156-1.

Natural light

Article 3 of the same décret covers light. It asks for “un éclairement naturel suffisant” (sufficient natural lighting). It also asks for an opening onto the open air. An opening onto a glazed space works too, if that space opens to the open air. But no fixed number is set. The decree has no glazing-to-floor-area ratio and no lux figure. Seen a ratio quoted for France? Treat it with care. We could not confirm one here.

The one hard number: ventilation

Ventilation is where French dwelling rules give you a real table. Article 3, arrêté du 24 mars 1982 (aération des logements) sets minimum mechanical extract flow rates. The rates go by the number of main rooms in the dwelling:

Main rooms	Kitchen (m³/h)	Bathroom/shower (m³/h)	Other water room (m³/h)	WC (m³/h)
1	75	15	15	15
2	90	15	15	15
3	105	30	15	15
4	120	30	15	30
≥5	135	30	15	30

Article 4 sets two cases. For four main rooms, its normal reduced-flow table needs 90 m³/h total extract and 45 m³/h in the kitchen. Some systems vary the flow on their own. They may use lower rates only with the approval Article 4 requires. For that case, 20 m³/h is the lowest allowed total. Do not mix values from the two cases.

Check the ventilation specification

First check which system and modes the design allows. Then choose the flow rates. Check the room rates in Article 3 and the lower rates in Article 4 together. Use the approved system design to size the fan. Do not add rates from different modes.

See Article 4’s current text.

Part of the French building-codes hub. It shows how the décence rules, the accessibility exemption and the NF DTU standards fit together.
Guard-rail height for a landing or stair opening off one of these rooms? See French stair & guard-rail rules.

Sources

Décret n°2002-120 du 30 janvier 2002 (logement décent), art. 3 & 4 — ceiling height / habitable area / volume, and the qualitative natural-light requirement. Read it at legifrance.gouv.fr.
Arrêté du 24 mars 1982 (aération des logements), art. 3 & 4 — the ventilation flow-rate tables. Read it at legifrance.gouv.fr.

Read this first. The 2.20 m / 9 m² / 20 m³ figures above are from Décret n°2002-120, a décence (habitability) rule, not a free-standing building-permit-stage clause — its current text was updated by Décret n°2021-872 du 30 juin 2021, which also cross-references the recodified CCH’s Article R.156-1 for the surface/volume definitions used. A former CCH overcrowding rule (old article R111-2: 14 m² / 33 m³ for the first four occupants) was abrogated outright on 1 July 2021 with no direct numeric replacement found — don’t cite it as current. The ventilation table is from the arrêté du 24 mars 1982, as amended in 1983, and remains the current governing instrument. Always confirm the current text on legifrance.gouv.fr before you rely on any figure here.

Frequently asked questions

Does France have a minimum ceiling height for a house?

Yes, in practice: 2.20 m for a main room ('pièce principale'). That comes from Article 4 of Décret n°2002-120 du 30 janvier 2002, the 'décence' (decent-housing) rule. If the height is under 2.20 m, the room can pass instead with 20 m³ of habitable volume. No separate building-permit clause sets a height.

Is the 2.20 m figure a building code rule or something else?

It is a tenancy and habitability ('logement décent') floor, not a building-permit design clause. It says when a dwelling is fit to rent out. Check any other construction, planning and local health rules separately.

Is there a minimum room size in France?

One main room must pass either test: 9 m² with 2.20 m height, or 20 m³ habitable volume. They are alternatives. It is a decency floor for one main room only. It is not a minimum floor area for every room in the house.

Do rooms need a minimum amount of natural light?

Article 3 of the same décret asks for 'sufficient natural lighting'. It also asks for an opening onto the open air, or onto a glazed space that opens to the open air. But no fixed number is set. The decree has no glazing-to-floor-area ratio, so treat any quoted ratio with care.

What ventilation numbers are actually mandatory?

The extract flow rates in the arrêté du 24 mars 1982. This is the one hard, table-driven number in French dwelling rules. A kitchen needs 75 m³/h in a 1-room dwelling, rising to 135 m³/h at 5 rooms or more. Bathrooms need 15–30 m³/h, depending on room count and layout. Full table below.