Plumbing, heat and air-conditioning installation: largest employers
2,731 Belgian companies in the sector (NACE 4322) report employees in recent accounts; here are the top 20. Imtech Belgium OU en Francais Imtech Belgique OU en Neerlandais Imtech Belgie leads with 568.2 FTE (financial year 2025).
Top 20
Ranked by average headcount (FTE) reported in the latest filed accounts (accounts less than 3 years old).
| # | Company | Total assets | Revenue | Equity | FTE | Year |
|---|---|---|---|---|---|---|
| 1 | Imtech Belgium OU en Francais Imtech Belgique OU en Neerlandais Imtech Belgie 1070 Anderlecht | €99.2m | €192.3m | €37.5m | 568.2 | 2025 |
| 2 | VMA Sud 6040 Charleroi | €54.9m | €90.3m | €11.1m | 330.4 | 2025 |
| 3 | Bumaco Koeltechniek 3110 Rotselaar | €31.8m | €95.4m | €18.5m | 269.3 | 2025 |
| 4 | SIX 8870 Izegem | €31.8m | €65.0m | €13.5m | 198.4 | 2025 |
| 5 | Aquasecurity 9320 Aalst | €22.8m | €43.0m | €13.6m | 133.8 | 2025 |
| 6 | Henkens Frères 4841 Welkenraedt | €13.0m | €21.1m | €1.70m | 118.5 | 2025 |
| 7 | Beltherm 8210 Zedelgem | €13.1m | €29.6m | €5.74m | 116.7 | 2025 |
| 8 | Senec 1420 Braine-l'Alleud | €6.11m | €15.5m | −950,968 € | 114.2 | 2024 |
| 9 | Full House 8800 Roeselare | €19.1m | €8.57m | €1.06m | 108.6 | 2025 |
| 10 | Etablissements Jordan 6240 Farciennes | €12.4m | €21.7m | €2.79m | 102.2 | 2025 |
| 11 | Clima & Partners 2110 Wijnegem | €16.6m | €32.0m | €3.55m | 101.5 | 2025 |
| 12 | Altebra 9500 Geraardsbergen | €165.2m | €60.6m | €34.2m | 101.3 | 2025 |
| 13 | Delta Thermic 4040 Herstal | €13.4m | €23.8m | €2.88m | 94.7 | 2025 |
| 14 | Goessens 4280 Hannut | €8.50m | €14.0m | 150,897 € | 93.7 | 2025 |
| 15 | Boons Theo 2370 Arendonk | €26.5m | €54.9m | €8.06m | 92.6 | 2025 |
| 16 | ISB Building Technics 1210 Saint-Josse-ten-Noode | €13.2m | €25.3m | €2.73m | 87.8 | 2025 |
| 17 | Les Entreprises Esmer 1190 Forest | €10.5m | €21.0m | €4.13m | 84.3 | 2025 |
| 18 | Gezel 9255 Buggenhout | €10.3m | €23.9m | €5.59m | 76.3 | 2025 |
| 19 | Weishaupt 1070 Anderlecht | €13.3m | €22.3m | €7.63m | 76.0 | 2025 |
| 20 | Au Coin du FEU 7110 La Louvière | €4.52m | — | €2.45m | 75.7 | 2025 |
Headcount reported by the company for all its sites: the jobs may be located elsewhere.
“—”: not published. Small companies (micro and abridged accounts) do not have to publish their revenue.
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Frequently asked questions
Who is the largest employer in Plumbing, heat and air-conditioning installation?
Imtech Belgium OU en Francais Imtech Belgique OU en Neerlandais Imtech Belgie, with 568.2 full-time equivalents reported (financial year 2025).
How many Plumbing, heat and air-conditioning installation companies report employees?
2,731 out of 8,151, in accounts less than 3 years old.
Analyse companies in Plumbing, heat and air-conditioning installation
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Open the full file →Active companies (legal entities) that have filed at least one set of annual accounts, based on the Crossroads Bank for Enterprises and the National Bank of Belgium. The sector is the main activity in the register; the municipality is that of the registered office. Data updated on 14 Nov 2026.