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Orangerie of the Hôtel de Sully, the restored interiors

In June 2018, the restoration of the interiors of the Orangerie of the Hôtel de Sully located in the 4th arrondissement of Paris was completed.

The Hôtel de Sully, built in the first half of the 16th century, remains one of the crown jewels of the Marais and the specific architecture of private mansions, called “between courtyard and garden.” The head office of the Center for National Monuments today, the mansion was moreover listed as a Historic Monument in 1862. As for the Orangerie, it was listed in 1953. In the 1960s, it was the object of major restoration work having altered it in a significant fashion. Unused for several decades and presenting major problems on the level of the roof and gutters, the Orangerie was the subject in 2014 of a diagnostic study conducted by 2BDM.

The complete project management, turned over to 2BDM, made it possible to renovate the building and make it usable again, according to the orientations defined by the contracting authority. Receptions, lectures and events with a cultural vocation will now be able to be held in its lower gallery. The first floor (upper gallery, east and west pavilions) were remodeled into coworking spaces. The original volumes were reestablished in the upper gallery through the demolition of modern partition walls that compartmentalized it. The woodwork of the doors and windows was repainted and, on the exterior, the gutters were restored. In the framework of this operation, 2BDM also designed the furniture and layout.

Versailles, the restored Hameau de la Reine

In May 2018, the Maison de la Reine reopened its doors to the public. Inspired by theories on the return to nature, the Hameau de la Reine in the park of the  Château de Versailles was built between 1783 and 1787, on the initiative of Marie-Antoinette. The Maison de la Reine, the Maison du Billard, the Réchauffoir and the gardens have just been restored by 2BDM. The restoration approach was to rediscover the architectural and landscape arrangements dating back to the creation of the Hameau in the 18th century, without however removing the contributions of the First Empire and the Restoration.

Three separate spaces can be distinguished: the Maison de la Reine and the Maison du Billard, the Rechauffoir and the gardens. The first benefited from the restoration of the façades, masonry, framework, tile and thatch roofs, the restitution of the spiral staircase and the exterior gallery, the restoration of the exterior and interior décors according to the earliest historical state known, the repair of the floors, the rollout of high and low-voltage electrical installations, as well as a climate treatment. In the Réchauffoir, deteriorated exterior restorations dating from the early 2000s were repaired on the level of coatings, wood sections, paving and thatch roofs. The interior restoration concerned the fireplace, the kitchen garden and the bread oven. The land around the Maison de la Reine was reworked and a gentle slope was created with the aim of drawing off runoff water and cleaning up the buildings. The paths of the 1786 plan were brought back to their original condition. The gardens were replanted. Only the vegetation present in the Hameau in the late 18th and early 19th centuries was introduced in this operation.

Vézelay Basilica, restoration of the Saint-Antoine tower and the southern arm of the transept

In March 2018, the restoration worksite of the Saint-Antoine tower and the southern arm of the transept of the Sainte-Marie-Madeleine Basilica in Vézelay ended.

Holder of a framework agreement for the conservation, restoration and enhancement of the basilica, 2BDM is currently in charge of several operations on this exceptional site, which is on UNESCO’s World Heritage Sites list.

The operation concerned an overlapping zone of several architectural spaces with a complex construction chronology. Thus, in addition to treating structural consolidation problems of the staircase turret and the gallery of the southern arm of the transept, to protect the tower’s upper masonry against inclement weather, to enhance the exterior as much as the interior by ensuring the most harmonious addition of light, the work undertaken also made possible the archeological analysis of spaces until this point barely accessible, completing our historical knowledge of this major but relatively undocumented monument. The Center for Medieval Studies of Auxerre handled the operation’s archeological followup.

Moreover, when the worksite was finished, and in order to use an available financial remainder, the interior restoration of the 9th bay of the southern aisle of the nave was added to the operation. The restoration of this entirely Romanesque bay of the church constitutes a test bay with the perspective of a future restoration of the nave of the monument, built in the first half of the 12th century.

Fontevraud Abbey, startup of the Romanesque kitchens worksite

In January 2018, the worksite of the restoration of the old Romanesque kitchens of the Fontevraud Abbey began under the direction of 2BDM. The edifice was listed as a Historic Monument in 1840, as well as several other major buildings of the abbey such as the abbey church, the Cloître du Grand Moutier, the infirmaries and the Saint-Benoît chapel.

Lacking its crown in the late 17th century, the building was the object of a complete restoration by the architect Lucien Magne in 1903-1907, with the restitution of the lanterns on the basis of contemporary examples and drawings by Viollet-le-Duc published in his Dictionnaire raisonné de l’architecture française du XIe au XVIe siècle.

The kitchen building is a singular construction with an octagonal plan flanked by absidioles with a crown bearing a dome motif and conical hoods in scale-cut stones. It was built in the early 12th century and was proportional to the size of the abbey’s medieval monastic population.

Whereas the kitchen building was not the object of any major work in the early 20th century, the worksite that began will enable the most deteriorated parts of the edifice to be stabilized and consolidated. The building will be cleaned and the authentic old elements will be conserved. The work, for an amount of €1,820,000 excluding tax, will be carried out until the end of 2020 at the latest.

Prior to the work, a major archeological campaign was carried out in order to better understand the building’s construction phases as well as its different uses over time.

Parc de Sceaux, 2BDM winner

In November 2017, 2BDM won the call for tenders for the restoration of the waterfalls and ripraps of the Grand Canal and the Octogone basin of the Parc de Sceaux.

The park’s waterfalls were built in the 1930s by the architect Léon Azéma, on the site of the old waterfalls of Le Brun, created at the end of the 17th century and destroyed during the French Revolution. Their functioning was interrupted following structural problems resulting from the instability of the ground. A complete restoration program is being defined to consolidate the ground and redo the structural works, restore the reinforced concrete elements and their impermeability and completely redoing the fountains. The plant environment and the landscape setting of the waterfalls will be totally restored following the arrangements identified in the project of the 1930s.

The ripraps of the Grand Canal, the Seignelay canal and the Octogone basin were the object of major restoration campaigns in the 1940s and 1980s. These works built on unstable ground and subject to erosion present major problems, with slanting and subsidence. Their restoration will concern the reconstruction of the most unstable sections and the consolidation of the weakened sections. An over-locking and pointing will be done on the walls of the banks dressed with rubble stones. The inclusion of structures (pontoon, works for the amphibians, etc.) will complete the repair of the ripraps.

With a projected work envelope of €4,200,000  excluding tax, 2BDM will handle the diagnosis, complete project management and scheduling, steering and coordination.

Exterior restoration of the Cherbourg theater, 2BDM prizewinner

In August 2017, 2DBM won the invitation to tender to continue the restoration of the Le Trident – Scène nationale theater in Cherbourg. Built in 1881-1882, the proscenium theater by Charles de Lalande is now a listed historic monument.

In 2011, we had already worked with the city of Cherbourg-Octeville on upgrading the theater’s technical installations. The following year, the municipality launched a general renovation project for the surroundings. This scheduled restoration was a continuation of the site’s promotion.

In line with the principles retained in the diagnosis we had conducted in 2014, we decided to keep to a faithful vision of the original elevations. Our group, in order to respond to the contracting authority’s program, will also work on improving the reception and comfort conditions for the public, as well as the enhancement of the exterior through the use of light. This approach is in keeping with contemporary light ambience that the city developed in the framework of the revamping of urban development, while respecting this theater’s exceptional historical and architectural features.

Completion of the restoration of the Saint-Martin de Laives church, 2BDM prizewinner

In July 2017, 2BDM won the invitation to tender for the exterior restoration of the nave and the completion of the interior restoration of the Saint-Martin de Laives church in the Saône-et-Loire department.

The Saint-Martin church is a genuine iconic building of the department, both through its privileged position and its architecture. It occupies the top of a hill where its bell tower proudly stands out, emerging from the imposing mass of its lauze or flagstone roofs, so typical of Burgundy. Architecturally, this church offers a fine historic synthesis, between a Romanesque structure and Gothic extensions.

After having undertaken, under our supervision, the restoration of the bell tower (1994-1995) and the partial renovation of the interior (1998-1999) of the Saint-Martin church, the commune decided to entrust us with completing the restoration of the church. We are therefore delighted to continue this collaboration with the commune of Laives.

The operation will make it possible to restore the roofs and façades of the nave, as well as the interior of the nave, the side aisles, the north chapel and the south chapel.

Restoration of the Saumur city hall, 2BDM prizewinner

In June 2017, 2BDM won the invitation to tender for the restoration of the façades of the city hall of Saumur, in the Maine-et-Loire department. Since the 16th century, the “Common House” of Saumur, now the hôtel de ville (city hall) has administered the Angevin city on the banks of the Loire. Part of the building is a listed historic monument. The city hall, with its rich architectural composition, was built from the 15th to the 20th century. Today, what is required is to restore the exterior. Initially, we will do a diagnosis after which an intervention program will be established. Next, we will handle the operation’s project management. We will have to meet several challenges. How can we propose a global project making the building’s successive historical states readable while ensuring a unified treatment of the entire site? It will concern once again providing a coherent reading to the composition of the façade through the treatment of the masonry, the ornaments and the woodwork. Likewise, in a more operational register, we must deal with the issues of managing a worksite on a functioning site that is open to the public in an urban context with a strong heritage value.

Château of Versailles: startup of restoration work on the royal chapel

In May 2017, restoration work on the chapel of the Château of Versailles was launched.

Built by Jules-Hardouin-Mansard between 1687 and 1710, it rises over three levels that an attic floor covered with slate and initially gilded lead crowns. Its imposing glasswork as well as the scope and richness of its sculpted décor, both inside and outside, make it one of the masterpieces of French religious art.

The project plans for the complete exterior restoration of the chapel. The roofs will be redone after the framework is straightened and consolidated. The decorative lead elements will be restored and their gilded finishing recovered. The exterior stone facings will be carefully cleaned and the most deteriorated stones will be replaced. The sculpted bas-reliefs and monumental statues, in a variable state of conservation, will be restored on a case-by-case basis, depending on the nature of the stone that composes them and their degree of alteration. Lastly, particular attention will be paid to the stained-glass windows as well as to their very elaborate ironwork. In conformity with the archival documents and early images, the ironwork will be regilded.


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The Mobilier national or the restoration of a 20th-century heritage building

In April 2017, startup of the worksite for the restoration of the exterior of the Perret Building.

Built in 1936 by August Perret to house the furniture storage of the Mobilier national, the building was listed as a historic monument in 1965. Suffering from pathologies due to the aging of the materials, the restoration of the exterior had become necessary.

A preliminary study, already carried out by 2BDM, permitted analyses and tests to be conducted in order to develop a restoration protocol for the old concrete. The altered concrete will be purged and repaired, with its smooth, roughened or grooved finish according to the case. The formerly smooth concrete that had become too eroded will be filled with a thin mortar in order to limit its porosity and to reestablish it in its role (drip moldings, window ledges…). A general cleaning will be done according to several methods: application of especially formulated cataplasms and graffiti and tag removal for white cement filler blocks, by cryogenics, micro-abrasion or pressurized hot-water cleaning on the concrete cast on site in gray cement.

Finishing work will be carried out on the facings for a patina application in order to recover the coloring that Perret had applied on the concrete and to match whatever has remained in place.

Saint-Eucaire church in Metz: a four-phase worksite is completed

In March 2017, a four-phase worksite, conducted by 2BDM, was finished.

Protected as a historic monument, the Sainte-Eucaire parish church was rebuilt between the 12th and 15th centuries on the site of a 8th-century paleo-Christian basilica. A gem of medieval architecture in Metz from the Romanesque to the Flamboyant Gothic period at the end of the 15th century, the Saint-Eucaire church has benefited from several restoration programs, notably the restoration of its framework and roofs, already conducted by Christophe Bottineau, in 2008.

The diagnostic that 2BDM established in 2011 concerning the exterior façades and the stained-glass windows brought to light their very relative state of conservation, the deterioration of certain materials, the wearing of the stones and the separation of the surface coatings.

The restoration campaign that has just been completed has permitted, on one hand, the restoration of the masonry elevations and, on the other, that of the dismounted/remounted stained-glass windows accompanied by the installation of double windows to protect the stained glass.

The second life of the Freyssinet Hall

In February 2017, the restoration and interior layout of Freyssinet hall, located at the heart of the ZAC Paris-Rive gauche neared its end.

At the end of the 1920s, the engineer Eugène Freyssinet showed his audacity by building a hall in prestressed concrete, a newly invented process. The hall was composed of three naves 310 m long with a width of 72 m. The two exterior naves were flanked by canopies hung from one side to the other for a total width of 90 m.

The former parcels building of the Austerlitz train station, threatened with demolition, became a listed historic monument in 2012. Two years later, the concrete building was bought by Xavier Niel to create a business incubator in it of 1 000 start up. If the global renovation project was entrusted to Jean-Michel Wilmotte2BDM was responsible for the project management on concrete structures.

The concrete structure was relatively well-preserved, but to add the weight of the mezzanines to it, the structure had to be strengthened by inserting micro-piles under the existing posts. The concrete was either painted or dirty, broken, flaked, filled, etc. After cryogenic cleaning, a facing mortar, created for the operation, was used on the building’s structures. The remaining stains were lightly patinated and made homogeneous. 

Restoration of the Verger pavilion in Rambouillet, 2BDM prizewinner

In January 2017, 2DBM won the invitation to tenders for the restoration of the Verger pavilion and its décors in Rambouillet.

A listed historic monument, the palace of the king of Rome constitutes a remarkable heritage ensemble that includes the Verger pavilion. Built in the late 18th century, the pavilion has had a rich and eventful history and has turned out to be one of the hidden treasures of the royal estate of Rambouillet. As our agency conducted a diagnosis on the building in 2015, we will manage the operation using the recommendations retained at the time in order to make the original pavilion comprehensible by enabling it to recover its status as a garden pavilion. It is also the occasion to once again provide the interior décor with all its justification, to allow the public to discover its interest and in this way make the garden of the palace of the king of Rome a major interest center.

In Paris, reopening of the medieval kitchens of the Conciergerie

In November 2016, the restoration work and the upgrading of safety standards for the Conciergerie kitchens were accepted

Built in the 14th century, the only remaining part of the pavilion of the Palais de la Cité kitchens is the ground-floor spaces, intended for personnel. With a square plan, ribbed vaults and four corner fireplaces, the kitchens were closed for 14 years after structural movements were observed in 2002.

In 2016, the operation conducted by 2BDM, whose contracting authority was the Centre des monuments nationaux, made it possible, on one hand, to analyze the structural issues and, on the other, to upgrade safety standards and restore the kitchens so that they could be reopened to the public. The work enabled the homogenization of the masonry, the restoration of the columns, facings, woodwork, metalwork and ironwork and the upgrading of the electricity networks to current standards.

The stabilization of the structures will be definitively treated at a later date.



Study, restoration and promotion of the Mâcon heritage, 2BDM prizewinner

In July 2016, 2BDM won the single-tenderer project management framework agreement for the study, restoration and promotion of the historic heritage belonging to the city of Mâcon.

The buildings concerned by this framework agreement are: the city hall, the wood house, the Saint-Vincent cathedral, the archeological site of the Saint-Clément church, the Saint-Jean-de-Loché church, the Vieux-Saint-Vincent church, the former Lamartine high school, the Cordeliers convent, the Hôtel de Senecé and the Musée des Ursulines.

The first major contract was the restoration of the Saint-Vincent cathedral. Built between 1808 and 1818, it was listed as a historic monument in 1994.

After the restoration of the two towers and the peristyle in 2008, the focus today is to solve the problem of the deterioration of the façades, framework and roofs.


Main Passenger Hall of the Austerlitz train station: light recovered

In June 2016, the first section of the restoration work of the Main Passenger Hall of the Austerlitz train station was completed.

The densification of this 280-meter-long hall, built in 1869, as well as the accumulation of soot over a century and a half, overcame the splendor of its glass cage, which gradually became invisible for passersby.

In the general framework of the restoration of the Austerlitz train station (2010-2022), which notably aims at the reappropriation of the space by users and operators, a complete restoration of the Main Passenger Hall was programmed. The operation, conducted by the AREP, made it possible to completely repair the metal framework over 50 meters. The worked wood ensembles of the façades were replaced and the dressed stone restored. Paneling and roof laths, that have a bracing function, were strengthened as needed, as was the tympanum. A new roof composed of zinc and glass elements was reinstalled, enabling natural light to once again enter the hall.  2BDM acted as a consultant for the AREP in the framework of this operation. Working especially on the issues of restoring the stone, woodwork and roofs, we contributed to the restitution of the hall’s original 1869 condition.

The Rubans du Patrimoine 2016 – the Perrecy-les-Forges worksite distinguished

In June 2016, the restoration of the former Saint-Pierre-Saint-Benoît de Perrecy-les-Forges prioral church, in the Saône-et-Loire department, was distinguished by the “Rubans du Patrimoine” national prize. This competition has promoted, for 22 years, exemplary worksites that restore and enhance early architectural heritage.

The Perrecy-les-Forges church is among the major monuments of the Romanesque heritage in Burgundy. Following the founding of the priory in the 11th century, then the completion of an enormous church in the 12th century, many interventions succeeded each other in the 15th to the 19th century, giving the ensemble a great archeological richness.

In 2009, major problems in the nave resulted in the closing of the church. The protection-restoration operation led us to dismount the completely disorganized framework and to restore and restitute the lower tie beams to support the work. The southern side aisles were also consolidated to house a flying buttress system for the deteriorated eaves wall, thanks to a wood beam concealed under the paneling of the vault of the side aisle and transferring the stress to the buttresses of the south wall, now masking the reinforced concrete piers anchored by micro-piles. After these structural repairs, the church benefited from an enhancement treatment. The interior facings were restored respecting the old skins resulting in the discovery of precious archeological evidence, as well as stained-glass windows. Adapted lighting finalized this operation, revealing all the interest in this building.

École militaire: launch of the restoration of the principal building

In May 2016, the worksite for the restoration of the exterior of the principal building of the École militaire in Paris was launched. 2BDM handled the project management.

The principal building of the École militaire (also called building 001) is part of a remarkable urban project as it faces the Champ-de-Mars, which is in its axis, consequently completing its composition. Built by Ange-Jacques Gabriel between 1764 and 1773, it is composed of a central pavilion and two lateral wings set at right angles on the courtyard side.

A study carried out by 2BDM in 2012 on the entire École militaire site revealed the extent of the difficulties, notably on the principal building. It presented advanced deterioration on its facings and major permeability problems on its roofs. On this basis, a restoration program for the building was established in six sections; the work should continue until 2025.

The Dufour pavilion is now the access to the Château of Versailles

In February 2016, the Dubour pavilion welcomed its first visitors. Its renovation, combined with that of the Old Wing, was part of the “Grand Versailles” master plan launched in 2003. As a result, the Dufour pavilion became the sole access space to the château for individual visitors, as well as its exit. The new volumes created by this particularly complex operation made it possible to reinforce the public’s reception with the creation of an information space, a waiting area, a checkroom, an access and ticket control space, a counter for returning audio guides and restrooms

The operation’s projection management, designed as a genuine partnership, was handled by the Dominique Perrault Architecture (DPA) and 2BDM agencies. DPA was in charge of civil engineering on the superstructure (apart from the historic monument) and the interior layout. 2BDM was responsible for civil engineering on the infrastructure, the restoration of remarkable interior spaces, façades, roofs and exterior woodwork.

This project drew its historic foundation from the modernization plan of the Château of Versailles imagined by Ange-Jacques Gabriel at the end of the 18th century. The Dufour and Gabriel pavilions were to be the château’s entrance points. This intention of the Ancien Régime was cut short by the French Revolution. Over 200 years later, it has become concrete.

École militaire: building 13 restored

In February 2016, 2BDM finished the restoration of building 13 of the École militaire in Paris.

The worksite started in early 2014 made possible: the consolidation of the foundations with underpinning, repair of the flooring and roofing structure, the restoration and consolidation of the framework, the complete renovation of the roofs in flat tiles, including the repair of the chimney stacks, the restoration of the old compositions of the façades with the cleaning and replacement of deteriorated stones, the repair of the lime plaster, the cleaning and consolidation of the sculpted group on the pediment, the repair of the woodwork, the repair of the large central staircase and the installation of lanterns for exterior lighting.

Bonifacio: a 10-year-long restoration at the Sainte-Marie-Majeure church

In January 2016, 2BDM completed the third phase of the restoration of the Sainte-Marie-Majeure church of Bonifacio.

This restoration, carried out under the contracting authority of the city of Bonafacio, was initiated in 2006 by a preliminary study.

The first phase concerned the consolidation of the bell tower and the restoration of the apse.

The second phase focused on the restoration of the roofs and the exterior façades.

The third phase, which was completed, was the restoration of the interiors, to repair all the deteriorated facings, restore certain altars and upgrade all the technical installations.


A last work phase will complete the restoration, with notably the last altars and the pulpit.

Versailles: the “Grand Commun” worksite is completed

 At the beginning of 2016, the renovation of the Grand Commun in Versailles was completed. Located a stone’s throw from the château, the Grand Commun, built between 1682 and 1686 by Jules Hardouin-Mansart, housed the services of the court and the staff apartments of the king’s officers. It will now house all the administrative services of the Établissement public du château du Versailles.

Right from the beginning of the work, in 2004, the main objective was to give all its architectural coherence back to this enormous quadrilateral of 24,000 m². A dismantling and asbestos removal campaign first made it possible to bring to light the original structures and volumes. The structures, masonry, framework and flooring were strengthened. An “energy pole” under the interior courtyard was created, bringing together the estate’s technical equipment. The façades were restored and the doorframes replaced, as well as the paving in the courtyard. The remarkable elements, notably the square corner staircases, the straight staircases and the French-style ceilings were strengthened, restored and enhanced. Lastly, the porch and its avant-corps on the rue de l’indépendance américaine were restored.

The interior layout of the building, treated in a contemporary fashion, was carried out by the architect Bernard Desmoulin.