- Building Type : Office building < 28m
- Construction Year : 2013
- Delivery year : 2014
- Address 1 - street : 20, rue Boétie 75008 PARIS, France
- Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.
- Net Floor Area : 3 961 m2
- Construction/refurbishment cost : 11 800 000 €
- Cost/m2 : 2979.05 €/m2
Primary energy need :
(Calculation method : RT 2005 )
Located in the Central Business District, thisbuilding built in 1878 displays its new identity and fits perfectly into itsenvironment by combining historic facades to contemporary glass elements;Haussmann of roofs vegetated roof terrace; heritage spaces with elementspreserved and modern spaces.
Redesigned in a logic consistent with the ambitions ofthe Grenelle II Environment and fully restructured in order to make a building"new": effective insulation on roof, reversible heat pumps,optimization of energy management via centralized building management, recoveryof rainwater, revegetation of the inner courtyard terraces and roof terraces:building 20 Boétie is certified NF Tertiary buildings HQE NF certificate No.380-12 / 1022 and certified HPE Effinergie Rénovation® certificate No.2015/555.
ADEME Ile-de-France wanted to support developers inachieving BBC® building through a grant awarded to the winner of a call forprojects BBC.
Renovation: After renovation, the buildingreached a draft Cep Cepref below -50%, GHG emissions have been lowered to less 5kgCO2/ m².year the air permeability of the casing is 1.2 m3 / h *m². Its performance allows it to be certified HQE NF Tertiary BuildingsCertificate No. NF 380-12 / 1022 and certified HPE Effinergie Rénovation®Certificate No. 2015/555.
Smart Building: Over 200 sensors were installed on the building tomeasure the different data (temperature, humidity, air quality, lighting,presence detectors ...) and optimize the operation of the building viaa specific GTB in operation.
Sustainable development approach of the project ownerNacarat is a developer fully committed to sustainable development. That's why an eco-design approach is consistently applied for all Nacarat programs since 2011. This project in downtown Paris is emblematic of this approach. The objective is to always go as far as possible in terms of performance, in the largest number of possible fields of action while keeping the operation within market prices.
In the 20 Boétie operation, the strategy consisted in pushing energy efficiency as if the building was newly constructed, while keeping it invisible or at least elegant. In addition, user comfort was increased by GTB controlled indoor air quality and by revegetation of a very constrained site (inner courtyard and high walls)
Architectural descriptionThe 20 Boétie building is now modern and efficient office building that preserves the memory of the past thanks to the conservation of heritage areas and historic features. It is also a building where it feels good to work in, because the roof tops and the courtyards have been revegetated, thus creating pleasant environment for the inoccupants but also for local residents while reducing the leakage flow of rainwater and the the heat island effect.
Building users opinion
The building was sold but not yet occupied in June 2015.
If you had to do it again?
Nacarat is quite ready to replicate such innovative projects: energy renovations are fascinating.
See more details about this projecthttp://immobilier-entreprise.nacarat.com/index.php/fr/immobilier-d-entreprise/nos-realisations?view=detail&id=42
DeveloperNacarat, agence Ile de France, groupe Rabot Dutilleul Sophie Galmard Director of corporate real estate programs
Thermal consultancy agencyCORE ETUDE Creative
OthersTracer Green roof business
Structures calculistGAMBA Acoustique René Gamba
- 66,00 kWhep/m2.an
- 148,00 kWhep/m2.an
- 1 027,00 kWhep/m2.an
- 0,52 W.m-2.K-1
- Heat pump
- Low temperature floor heating
- Individual electric boiler
- Reversible heat pump
- Fan coil
- Nocturnal Over ventilation
- Double flow heat exchanger
- No renewable energy systems
- 1 135,00 m2
- 82,00 %
Structural work / Structure - Masonry - Facade
The advantages of VERTIFLORE facades:
• Sound Attenuation: B3 / Rw = 61db (test by CSTB)
• Sound absorption: A4 / Dla = 14DB (aw = 1.00 Class A) (test by CSTB)
• Thermal insulation (limitation of the effect of urban heat island)
• Reintroduction of biodiversity
• Pollution Control of ambient air (oxygen release and retention of CO2 and dust)
• Fire resistant (M1) (test by CSTB)
• Resists seismic waves : can be installed in Zone 5
• Maintenance consumes little water and no fertilizer
- 5,00 KgCO2/m2/an
- 240,00 KgCO2 /m2
- 100,00 année(s)
Life Cycle Analysis
Other case studies
- User User
- User User