Open Plan Office Acoustic Design in France — NRA 2000 Requirements
Open plan workspaces, trading floors, collaborative offices. Typical volume: 500-5,000 m².
What NRA 2000 Requires for a Open Plan Office in France
Regulation: NRA + Code du travail
RT60 target: ≤ 0.8s
Background noise limit: 35–40 dBA
Local note: French labour code references NRA acoustic limits for workplaces.
How to Calculate NRA 2000 Compliance for a Open Plan Office in France
- 1
Identify the applicable France standard and target
Look up NRA 2000 for open plan office spaces in France. The RT60 target is ≤ 0.8s. NRA + Code du travail.
- 2
Measure or model the room geometry
Record the length, width, and height of the room to calculate the volume. A typical open plan office has a volume of 500-5,000 m².
- 3
List all surfaces and their absorption coefficients
For each surface (floor, ceiling, walls, windows, doors), find the absorption coefficient at each octave band frequency (125 Hz to 4 kHz) from ISO 354 test data or a materials database.
- 4
Calculate total absorption and apply the Sabine or Eyring equation
Sum all surface absorption values: A = sum of (alpha x area). Then apply T60 = 0.161 x V / A (Sabine) or T60 = -0.161 x V / (S x ln(1 - alpha_avg)) (Eyring). Use Eyring when average alpha exceeds 0.20.
- 5
Compare result against NRA 2000 and specify treatment
If the calculated RT60 exceeds the target of ≤ 0.8s, specify additional absorption. Typical treatment cost in France is €75–€135/m².
Cost of Compliance in France
Treatment Cost Range
€75–€135/m²
Currency: €
What Affects Cost
- • Room volume and surface area
- • Target standard strictness
- • Existing acoustic conditions
- • Finish and material quality
How NRA 2000 Differs from Other Standards for Open Plan Office in France
| Requirement | NRA 2000 | WELL v2 Feature 74 |
|---|---|---|
| RT60 Target | ≤ 0.8s | ≤ 0.5s |
| Background Noise | 35–40 dBA | ≤ 45 dBA |
| STI | Not specified | < 0.50 |
| Cost Range | €75–€135/m² | €85–€150/m² |
Frequently Asked Questions
What RT60 does NRA 2000 require for a open plan office in France?
NRA 2000 requires a reverberation time of ≤ 0.8s for open plan office spaces in France. NRA + Code du travail. Measurement should be performed per ISO 3382-2 methodology.
What is the background noise limit for a open plan office in France?
The background noise limit is 35–40 dBA under NRA 2000. This typically refers to HVAC and building services noise measured with the room unoccupied.
How much does acoustic treatment cost for a open plan office in France?
Typical acoustic treatment for a open plan office in France costs €75–€135/m². Costs vary based on finish quality, room size, and existing conditions.
Calculate NRA 2000 Compliance for Your Open Plan Office in France
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