Le Réseau des Professionnels

Ateliers Gohard

SAS Ateliers Gohard

Founded in 1962, Ateliers Gohard is the pre-eminent French workshop for architectural gilding, decorative painting, and the restoration of historical heritage interiors. From the golden gates of Versailles to the flame of the Statue of Liberty in New York and the Dôme des Invalides, three generations of master gilders have preserved rare traditional water-gilding (dorure à la détrempe) and oil-size gilding techniques on stone, wood, and metal.

Ateliers Saint-Jacques & Fonderie de Coubertin

Fondation de Coubertin — Ateliers Saint-Jacques

Operated by the Fondation de Coubertin in the Chevreuse Valley, Ateliers Saint-Jacques brings together four historic trades: monumental stonemasonry, heavy timber carpentry, bronze art casting, and architectural ironwork. Deeply linked to the French Compagnonnage, the workshops executed the complete historical reconstruction of the Grille Royale at Versailles and restored ornamental metallurgy for Notre-Dame de Paris.

Ateliers Loire Chartres

SAS Ateliers Loire

Chartres is the spiritual home of European medieval stained glass. Established in 1946 by Gabriel Loire, Ateliers Loire represents three generations of glassmasters specialising in the preservation, cleaning, and thermal protective glazing of 12th- to 16th-century stained glass windows across France and Europe.

Atelier Debitus

Atelier Hervé Debitus

Founded by Maître d'Art Hervé Debitus, this Tours workshop bridges historic craftsmanship and conservation science. In close partnership with the French LRMH, the atelier researches and reproduces authentic 13th- and 14th-century mineral grisaille paints and silver stains used in cathedrals such as Bourges, Rouen, and Le Mans.

Cathedral Works Organisation

CWO Ltd.

Formed originally from the Chichester Cathedral restoration team in 1965, Cathedral Works Organisation (CWO) has grown into one of Britain's most respected masonry and stone conservation companies. Working with Portland, Bath, and Caen stone, their master bankers and carvers restore medieval traceries, rib vaults, and historic manor facades.

Carpenter Oak

Carpenter Oak Ltd.

Carpenter Oak has spent over 35 years handcrafting traditional heavy timber frames from sustainably managed British and European green oak. Using historic mortise-and-tenon joints secured with dry oak pegs, their carpenters restore medieval tithe barns, Tudor hammerbeam roofs, and Elizabethan country houses.

Barley Studio

Barley Studio Ltd.

Based in York, Barley Studio is internationally recognized for the conservation of ancient stained glass windows from the 12th to the 20th century. Led by Keith Barley MBE, the studio pioneered environmental protective isothermal glazing in Great Britain and directed the conservation of medieval masterpieces at York Minster and Lichfield Cathedral.

Ironart of Bath

Ironart of Bath Ltd.

Located in the UNESCO World Heritage city of Bath, Ironart specializes in the conservation and authentic forging of historic architectural ironwork. Working with pure charcoal-wrought iron and historic cast iron, the workshop restores Georgian estate gates, Regency balcony railings, and Victorian park canopies using traditional hot riveting and fire welding.

Opificio delle Pietre Dure

Istituto Superiore per la Conservazione ed il Restauro (MiC)

Established in 1588 by Grand Duke Ferdinando I de' Medici, the Opificio delle Pietre Dure in Florence is globally recognized as the supreme authority in stone restoration, hardstone carving (commesso fiorentino), and scientific cultural heritage conservation. Operating scientific laboratories, it conserves Renaissance marble sculptures, bronzes, and monumental architectural surfaces.

Fornace Orsoni Venezia 1888

Orsoni Smalti Veneziani S.r.l.

Fornace Orsoni is the last historic glass furnace operating within the city of Venice itself. Since 1888, using crucibles and secret alchemical formulas, Orsoni has produced artisanal 24-karat gold leaf mosaic tesserae and hand-poured smalti glass used in the restorations of St Mark's Basilica, the Paris Opera, and royal palaces worldwide.

Nicola Restauri

Nicola Restauri S.r.l.

Founded in 1947 in Aramengo (Piedmont), Nicola Restauri is one of Italy's premier family ateliers for the conservation of fine art and architectural decorative painting. Working under strict Italian State superintendency directives, they have conserved monumental frescoes in northern Italian châteaux, ducal chapels, and Renaissance palazzi.

Kölner Dombauhütte

Hohe Domkirche zu Köln — Dombauhütte

Tracing its origins to the laying of Cologne Cathedral's foundation stone in 1248, the Kölner Dombauhütte is one of Europe's most revered cathedral mason lodges. Inscribed on the UNESCO Intangible Cultural Heritage list, its master stonecutters, sculptors, and conservators maintain Gothic flying buttresses, tracery, and Drachenfels trachyte and sandstone masonry.

Derix Glasstudios

Derix Glasstudios GmbH & Co. KG

Founded in 1866 in Taunusstein near Wiesbaden, Derix Glasstudios is one of the world's most accomplished workshops for architectural and stained glass. Its conservation department restores medieval church windows, 19th-century historicist stained glass, and early modern monumental glazing utilizing advanced scientific cleaning and protective glass techniques.

Bamberger Natursteinwerk Hermann Graser

Bamberger Natursteinwerk Hermann Graser GmbH

Headquartered in the UNESCO World Heritage town of Bamberg, Bamberger Natursteinwerk combines direct ownership of historical German sandstone quarries with master banker masonry and 3D architectural scanning. The firm was chosen to execute the monumental baroque sandstone sculptures and facades for the reconstructed Berlin Palace (Berliner Schloss).

Kunstschmiede Schütte

Kunstschmiede Schütte GmbH

Located in the Sauerland region of Westphalia, Kunstschmiede Schütte is one of Germany's most distinguished architectural blacksmithing ateliers. Working at the anvil with open coal fires, their master smiths forge monumental estate gates, decorative balustrades, church hardware, and restore historic ironwork dating from the Gothic to the Art Nouveau eras.

Restauratiebouwbedrijf Schakel & Schrale

B.V. Schakel & Schrale

Established in 1923, Schakel & Schrale is Amsterdam's most iconic historic restoration firm. Specializing in canal-side townhouses (grachtenpanden), 17th-century timber framing, foundation underpinning, and slate roofing, the company has conserved the Royal Palace on Dam Square, the Rijksmuseum, and countless listed Dutch monuments.

Slotboom Steenhouwers

Slotboom Steenhouwers B.V.

Founded in 1928, Slotboom Steenhouwers in Utrecht is one of the Netherlands' most respected natural stone restoration workshops. Specializing in Belgian bluestone (hardsteen), bentheimer sandstone, and limestone, their master masons contributed extensively to the multi-year restoration of the iconic 112-metre Dom Tower in Utrecht.

Koninklijke Tichelaar

Koninklijke Tichelaar B.V.

Documented continuously in Makkum (Friesland) since 1572, Koninklijke Tichelaar is the oldest operating enterprise in the Netherlands. Internationally revered for its tin-glazed earthenware and custom architectural ceramics, Tichelaar restores 17th- and 18th-century Delft tile rooms in historic castles, manor houses, and state museums throughout Europe.

Restauratie De Witte Vandecaveye

NV De Witte Vandecaveye

Based near Bruges, De Witte Vandecaveye is one of Flanders' premier historic carpentry firms. For nearly 50 years, the firm has restored monument roof structures, belfry carillons, guild houses, and windmills across Belgium, deploying traditional timber joints and hand-hewn oak.

Monument Vandekerckhove

NV Monument Vandekerckhove

Founded in 1936 in Ingelmunster, Monument Vandekerckhove is Belgium's leading multidisciplinary heritage contractor. From the restoration of the Cathedral of Our Lady in Antwerp and the Ghent Belfry to historic Flemish castles, their integrated workshops master stone carving, lime mortar stabilization, and timber conservation.

Glaskunst & Restauratie Schryvers

BVBA Glaskunst Schryvers

Operating in Antwerp, Glaskunst & Restauratie Schryvers specializes in the meticulous conservation and cleaning of historic Flemish stained glass. Employing reversible conservation varnishes, lead reteaming, and custom isothermal double-glazing, the atelier preserves irreplaceable ecclesiastical and domestic historic glass.

Ars Antiqua Restaura

Ars Antiqua Restaura S.L.

Headquartered in historic Toledo, Ars Antiqua Restaura is a specialized Spanish conservation atelier devoted to monumental stone, plasterwork, and architectural Mudéjar ceramics. Their conservators conduct chemical surface desalinisation, lime consolidation, and structural stabilization across castles and historical monuments in Castile and Andalusia.

Taller de Cantería Ramón Delgado

Cantería Ramón Delgado S.L.

Rooted in the ancient stonecutting traditions of Trasmiera in Cantabria, the Taller de Cantería Ramón Delgado carries forward Spain's most respected masonry heritage. Specializing in golden sandstone (arenisca), carved heraldic crests, arches, and balustrades, the workshop restores casonas montañesas and noble palaces throughout northern Spain.

Viúva Lamego

Fábrica de Cerâmica Viúva Lamego S.A. (est. 1849)

Corticeira Amorim Heritage Archive

Corticeira Amorim S.G.P.S. (est. 1870)

Hofstuckateur Gebrüder Detter

Detter Stuckateurmeister GmbH (est. 1894)

Guggenbichler Holzbau & Denkmalpflege

Guggenbichler Zimmerei GmbH

Fonderie Paccard

Fonderie Paccard SAS (est. 1796)

Schmiede Krenzer Metallkunst

Kunstschmiede Krenzer e.K.

Hoppen Restauratie & Decoratieschilders

Schildersbedrijf Hoppen B.V. (est. 1912)