# Delannoy Dewailly

> DELANNOY-DEWAILLY is a century-old, family-controlled French HVAC and plumbing group based in Armentières, providing design, installation, maintenance, monitoring, and repair services for heating, ventilation, air conditioning, plumbing, and smoke-extraction systems.

Company page on Leadbay: https://mad-max.leadbay.ai/company/delannoy-dewailly.fr · loaded 2026-10-29

## At a glance

- Website: https://delannoy-dewailly.fr
- Team based in: Lille (delannoy-dewailly.fr and 1 more)
- Founded: 1912 (delannoy-dewailly.fr and 1 more)
- Industry: Construction
- Employees: 60 (employees and founders, investors not counted; delannoy-dewailly.fr and 1 more)

## What it sells, to whom

- DELANNOY-DEWAILLY is a century-old, family-controlled French HVAC and plumbing group based in Armentières, providing design, installation, maintenance, monitoring, and repair services for heating, ventilation, air conditioning, plumbing, and smoke-extraction systems. ([delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/), [delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/entreprise/), [delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/entreprise/metiers-entreprise/))

## Why it stands out

- ISO 9001 certified since 2008 and ISO 14001 certified since 2014. ([delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/entreprise/), [delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/entreprise/metiers-entreprise/))
- Competes with: No specific competitors are named in the reviewed sources. The company competes broadly with regional HVAC, plumbing, ventilation, and maintenance contractors serving public, tertiary, hospital, and industrial projects. ([delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/entreprise/metiers-entreprise/), [lesechos.fr](https://www.lesechos.fr/2012/03/delannoy-dewailly-prend-du-souffle-dans-le-genie-climatique-354312))

## Products and services

- Heating systems, including heat pumps, solar thermal, heated floors, and radiant panels ([delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/entreprise/metiers-entreprise/), [delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/maintenance/), [traxxeo.com](https://traxxeo.com/actualite/delannoy-dewailly-numerise-sa-gestion-des-temps-et-des-activites-avec-traxxeo/))
- Ventilation and air-treatment systems, including clean-room and hospital applications ([delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/entreprise/metiers-entreprise/), [delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/maintenance/), [traxxeo.com](https://traxxeo.com/actualite/delannoy-dewailly-numerise-sa-gestion-des-temps-et-des-activites-avec-traxxeo/))
- Air conditioning and cooling systems ([delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/entreprise/metiers-entreprise/), [delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/maintenance/), [traxxeo.com](https://traxxeo.com/actualite/delannoy-dewailly-numerise-sa-gestion-des-temps-et-des-activites-avec-traxxeo/))
- Smoke-extraction systems ([delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/entreprise/metiers-entreprise/), [delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/maintenance/), [traxxeo.com](https://traxxeo.com/actualite/delannoy-dewailly-numerise-sa-gestion-des-temps-et-des-activites-avec-traxxeo/))
- Preventive and corrective maintenance, remote monitoring, remote management, servicing, and emergency repairs ([delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/entreprise/metiers-entreprise/), [delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/maintenance/), [traxxeo.com](https://traxxeo.com/actualite/delannoy-dewailly-numerise-sa-gestion-des-temps-et-des-activites-avec-traxxeo/))
- Digital workforce-management deployment using Traxxeo Digital Timesheets, Resource Planning, and Absence Management ([delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/entreprise/metiers-entreprise/), [delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/maintenance/), [traxxeo.com](https://traxxeo.com/actualite/delannoy-dewailly-numerise-sa-gestion-des-temps-et-des-activites-avec-traxxeo/))

## Customers and markets

- **Customers**: Louvre-Lens, Musée de Flandre, Lille Flandres SNCF station, Palais de la Bourse de Lille, Centre Hospitalier de Tourcoing, Plateau de Recherche et de Transfert de Technologies d’Evreux, Lille regional government headquarters, Opéra de Lille, Musée d’Art et d’Industrie de Roubaix, Lesaffre, Nestlé, Public-sector establishments, schools, and industrial sites ([sqi.fr](https://sqi.fr/images/pdf/petit-journal/lpj14.pdf), [sqi.fr](https://sqi.fr/images/pdf/cas-clients/case_study_delannoy_dewailly.pdf), [lesechos.fr](https://www.lesechos.fr/2012/03/delannoy-dewailly-prend-du-souffle-dans-le-genie-climatique-354312))
- **Markets**: Geography: Hauts-de-France and the wider northern half of France, with activity historically extending from the Lille region toward northern Paris. ([delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/), [delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/entreprise/references-entreprise/), [delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/maintenance/references-maintenance/))
- **Markets**: End markets: public and institutional buildings, including schools/colleges, universities, hospitals/healthcare, museums/cultural venues, transport/SNCF facilities, fire and police stations, sports facilities and offices. ([delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/), [delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/entreprise/references-entreprise/), [delannoy-dewailly.fr](https://www.delannoy-dewailly.fr/category/maintenance/references-maintenance/))

## Team

- Jean-Sébastien Zamolo, Président

## Latest news

- 2022-12-09 · [DM2022-224-ACTE MODIFICATIF 1 LOT 2 - DELANNOY DEWAILLY MAINTENANCE | Gravelines](https://www.ville-gravelines.fr/dm2022-224-acte-modificatif-1-lot-2-delannoy-dewailly-maintenance) (ville-gravelines.fr)
- 2012-03-29 · [Delannoy Dewailly prend du souffle dans le génie climatique - Les Echos](https://www.lesechos.fr/2012/03/delannoy-dewailly-prend-du-souffle-dans-le-genie-climatique-354312) (lesechos.fr)

## Where to find more

- [This page in Markdown, for agents](https://mad-max.leadbay.ai/company/delannoy-dewailly.fr.md)

## Decision makers

- [Jean-Sébastien Zamolo](https://mad-max.leadbay.ai/person/jean-sebastien-zamolo--delannoy-dewailly.fr.md), Président

Work emails and direct phones come with a Leadbay account: https://wow.leadbay.ai/?register=true

Where it comes from: 18 sites read (delannoy-dewailly.fr, annuaire-entreprises.data.gouv.fr, traxxeo.com, sqi.fr, lesechos.fr, tenderarc.com, fr.linkedin.com, ville-gravelines.fr, …).

## Best angle

2026-10-01 · Traffic: Site visits up 709% in 3 months, 1,229 a month (1 source)

## Signals: what happened

- 2026-10-01 · Traffic: Site visits up 709% in 3 months, 1,229 a month (1 source: [A company database](https://www.delannoy-dewailly.fr/))
- 2026-08-29 · News: Chargé d'Affaires Travaux CVC H/F (1 source: [fr.linkedin.com](https://fr.linkedin.com/posts/delannoy-dewailly_charg%C3%A9-daffaires-travaux-cvc-hf-activity-7495747332668379136-PJ6r))
- 2026-04-14 · Projects: 🚨 [NOUVEAU CHANTIER] 🚨 Chantier Reconstruction sur site du Collège Georges Brassens à ST VENANT (1 source: [fr.linkedin.com](https://fr.linkedin.com/posts/delannoy-dewailly_nouveau-chantier-chantier-reconstruction-activity-7449819916104347648-A_ng))
- 2026-03-26 · News: Clap de fin pour le projet de réhabilitation du Crématorium d’Herlies 👏 (1 source: [fr.linkedin.com](https://fr.linkedin.com/posts/delannoy-dewailly_clap-de-fin-pour-le-projet-de-r%C3%A9habilitation-activity-7442945532815269888-uMTd))
- 2026-02-27 · Partnership: 🔍 Audit interne ISO 9001 & 14001: une expérience enrichissante et collaborative (1 source: [fr.linkedin.com](https://fr.linkedin.com/posts/delannoy-dewailly_audit-interne-iso-9001-14001-une-exp%C3%A9rience-activity-7433199559339769857-hPHt))
- 2026-02-20 · News: 📢 Nouveaux contrats de maintenance 📢 (1 source: [fr.linkedin.com](https://fr.linkedin.com/posts/delannoy-dewailly_maintenance-territoire-partenariat-activity-7430629749422469120-pfhz))
- 2026-02-13 · News: 🔧 Garantir la fiabilité de nos mesures: focus sur l’étalonnage de nos équipements froid ❄️ (1 source: [fr.linkedin.com](https://fr.linkedin.com/posts/delannoy-dewailly_garantir-la-fiabilit%C3%A9-de-nos-mesures-activity-7428107695905480704-exxt))
- 2026-02-08 · News: Inauguration du Collège Maxence Van der Meersch (1 source: [fr.linkedin.com](https://fr.linkedin.com/posts/delannoy-dewailly_inauguration-du-coll%C3%A8ge-maxence-van-der-meersch-activity-7426281334286950400-q5of))
- 2026-01-26 · Projects: 🚨 [NOUVEAU CHANTIER] 🚨 Reconstruction du Collège Fernande Benoist à Hazebrouck (1 source: [fr.linkedin.com](https://fr.linkedin.com/posts/delannoy-dewailly_nouveau-chantier-reconstruction-activity-7421539440713527296-pZ11))
- 2025-03-14 · News: DELANNOY-DEWAILLY (1 source: [fr.linkedin.com](https://fr.linkedin.com/company/delannoy-dewailly))
- 2022-12-09 · News: DM2022-224-ACTE MODIFICATIF 1 LOT 2 (1 source: [ville-gravelines.fr](https://www.ville-gravelines.fr/dm2022-224-acte-modificatif-1-lot-2-delannoy-dewailly-maintenance))
- 2012-03-29 · News: Delannoy Dewailly prend du souffle dans le génie climatique (1 source: [lesechos.fr](https://www.lesechos.fr/2012/03/delannoy-dewailly-prend-du-souffle-dans-le-genie-climatique-354312))

## Working on now

- Regional building-services delivery in Hauts-de-France, with current public contracts spanning heating, ventilation, plumbing, air-conditioning and sanitary works for schools, healthcare, public buildings and emergency facilities.
- Recent project activity includes the EHPAD restructuring/renovation/extension launched with a first straw-insulation wall in July 2026, the Liévin Jean Jaurès school reconstruction, and the Blanchemaille–Roubaix reuse-focused project.
- The company is emphasizing energy efficiency, environmental management, clean construction practices and reuse of materials; its published policy also mentions improving controls, employee awareness and environmentally informed supplier selection.
- The business operates through Delannoy Dewailly Entreprise (works) and Delannoy Dewailly Maintenance (maintenance, remote monitoring/telemanagement, servicing and repairs), centered in Armentières/Lille and serving northern France.

From: [DELANNOY-DEWAILLY](https://fr.linkedin.com/company/delannoy-dewailly), [DELANNOY DEWAILLY ENTREPRISE : 52 marchés publics remportés | DossiersGagnants](https://dossiersgagnants.fr/entreprise/389313255-delannoy-dewailly-entreprise), [Inauguration du Collège Maxence Van der Meersch – Mouvaux](https://fr.linkedin.com/posts/delannoy-dewailly_inauguration-du-coll%C3%A8ge-maxence-van-der-meersch-activity-7426281334286950400-q5of), [NOTRE POLITIQUE QUALITE ENVIRONNEMENT](http://www.delannoy-dewailly.fr/wp-content/uploads/2023/05/PO08QE-Politique-Qualit%C3%A9-Environnement.pdf)

## Summary

Delannoy Dewailly is a family-owned French company based in Armentières that specializes in climate engineering, including heating, ventilation, air conditioning (HVAC), and sanitary plumbing. Founded in 1912, it is currently led by Jean-Sébastien Zamolo. The company sells installation, maintenance, and repair services to public sector entities, industrial clients, and the tertiary sector. Major customers include the SNCF, the Hauts-de-France region, the Department of the North, and various municipal and state facilities. It is an independent family group and does not disclose external investors. Recent news includes its participation in the 2026 inauguration of the Collège Maxence Van der Meersch in Mouvaux, where it installed high-performance heating technology.

[1]: https://www.delannoy-dewailly.fr/category/entreprise/ "Delannoy Dewailly |   Entreprise"
[2]: https://www.delannoy-dewailly.fr/ "Delannoy Dewailly | Entreprise de génie climatique basée dans le Nord de la France."
[3]: https://www.delannoy-dewailly.fr/category/maintenance/references-maintenance/ "Delannoy Dewailly |   Références"
[4]: https://www.delannoy-dewailly.fr/category/maintenance/ "Delannoy Dewailly |   Maintenance"
[5]: https://www.lesechos.fr/2012/03/delannoy-dewailly-prend-du-souffle-dans-le-genie-climatique-354312 "Delannoy Dewailly prend du souffle dans le génie climatique - Les Echos"
[6]: https://tenderarc.com/fr/entreprise/delannoy-dewailly-entreprise-389313255/ "DELANNOY DEWAILLY ENTREPRISE — 17 marchés publics gagnés | TenderArc"
[7]: https://fr.linkedin.com/posts/delannoy-dewailly_inauguration-du-coll%C3%A8ge-maxence-van-der-meersch-activity-7426281334286950400-q5of "Inauguration du Collège Maxence Van der Meersch – Mouvaux"
[8]: https://sqi.fr/images/pdf/cas-clients/case_study_delannoy_dewailly.pdf "Anticiper et agir grâce à une vision globale et partagée des"

## Sources

- [Delannoy-Dewailly's website](https://delannoy-dewailly.fr)
- [DELANNOY-DEWAILLY](https://fr.linkedin.com/company/delannoy-dewailly)
- [DELANNOY DEWAILLY ENTREPRISE : 52 marchés publics remportés | DossiersGagnants](https://dossiersgagnants.fr/entreprise/389313255-delannoy-dewailly-entreprise)
- [NOTRE POLITIQUE QUALITE ENVIRONNEMENT](http://www.delannoy-dewailly.fr/wp-content/uploads/2023/05/PO08QE-Politique-Qualit%C3%A9-Environnement.pdf)