CAEN Code Rev. 3

4322

Plumbing, heating and air conditioning installation works

EU NACE Equivalent: NACE Rev. 3 — 4322

This code covers the execution of plumbing, heating (including boilers, radiators, underfloor heating) and air conditioning (climate control systems, mechanical ventilation) works. Essentially, any company that installs, repairs or maintains water, sewer, gas (for interior installations), district heating systems or HVAC equipment falls under this code. It does not include the production of components or large industrial installations, but focuses on works in residential, commercial or public buildings.

Entrepreneur Profile

Acest cod este potrivit pentru firme mici și mijlocii (SRL, PFA, II) specializate în instalații sanitare, termice și HVAC, care execută lucrări în clădiri rezidențiale, birouri, spații comerciale sau clădiri publice. De asemenea, este util pentru meseriași autorizați (instalatori autorizați ISCIR, ANS) care oferă servicii de montaj, reparații și întreținere.

Who should avoid:

Avoid the exclusive use of code 4322 if the main activity of your company shifts towards other commercial or related branches not specified in the official description. See the excluded activities section below.

Authorization procedure and Trade Register aspects for CAEN 4322

For CAEN code 4322, registration with the Trade Register (ONRC) requires submitting a standard file according to Law 265/2022. The company (LLC, SA, Sole Proprietorship) must declare the main activity according to the Classification of Activities in the National Economy. The documentation includes the application form, the constitutive act, proof of registered office, and the affidavit under Law 359/2004, by which the administrator confirms that no prior approvals from other institutions are necessary for operation. However, at first registration, ONRC may request clarifications if the activity involves specific risks (pressurized installations, gas). It is recommended to consult a specialized lawyer to verify whether the premises allow technical spaces (material storage, equipment garage). After registration, the fiscal vector is completed at the Tax Authority (ANAF) within 30 days, and the CAEN code will be reflected in the certificate of registration.

Regulatory framework, specific permits and control institutions

Execution of installation works related to CAEN 4322 falls under Law 10/1995 on quality in construction and the ISCIR Norms (for pressurized installations, boilers). There is no obligation for an ISCIR certificate for domestic works, but for natural gas connections or installations with pressures > 0.5 bar, verification by a certified technical expert is required. Also, works for new buildings require technical assistance from the installation designer (authorized under Law 163/2016). Current controls are exercised by the State Inspectorate in Construction (ISC) and, for fiscal checks, by ANAF. For the use of air conditioning systems, the legislation on fluorinated gases (Regulation 517/2014) applies – registration with the Environmental Guard is required for operators installing systems with significant amounts of refrigerant. Additionally, for works performed on public domain or on the base of residential buildings, the approval of the homeowners' association and, where applicable, a building permit from the local municipality must be obtained.

Fiscal management, ANAF audit risk and specific accounting

From a fiscal perspective, income from service provision (installations) is taxed according to Title II of the Fiscal Code (16% corporate income tax or income tax for micro-enterprises, if the threshold conditions are met). Companies providing exclusively installation services may apply the VAT on collection system (cash accounting VAT) if the annual turnover does not exceed EUR 500,000, according to art. 282^2 of the Fiscal Code. The ANAF audit risk is particularly high for discrepancies between declared income and income recorded through the RO e-Factura system (mandatory from January 1, 2024 for B2B operations). It is mandatory to keep work estimates, fiscal invoices for materials (purchased from suppliers with VAT) and contract works agreements. Specific accounting includes separate recording of services performed by phases (labor, equipment, consumables) and correct calculation of profit for each contract. For sole proprietorships or individual enterprises, the single declaration (D212) is submitted to ANAF, and social contributions are calculated based on net realized income, with a minimum threshold of 12 minimum gross wages per country. ANAF inspections typically target underreporting of income (cash receipts without fiscal receipt), therefore it is recommended to issue an invoice for any service provided, including for individuals (with e-Factura for those who request it). Do not forget the obligation to register in the unique register of operators (RONP) if refrigerants or equipment with hazardous substances are used – periodic checks by the Environmental Guard.


Included Activities

  • ✅ Installation and repair of plumbing systems (water pipes, sewage, sanitary fixtures)
  • ✅ Installation and repair of heating systems (boilers, radiators, underfloor heating, solar panels for hot water)
  • ✅ Installation and repair of air conditioning and ventilation systems (split units, VRV systems, fans, heat recovery units)
  • ✅ Maintenance and servicing of plumbing, heating and air conditioning installations
  • ✅ Installation of gas pipes for interior installations (with specific permits)
  • ✅ Thermal insulation works for pipes and related equipment

Excluded Activities

  • ❌ Production of components for installations (pipes, radiators, boilers) – CAEN codes in division 25 or 28
  • ❌ Installation of district heating systems at urban level (district heating networks) – code 4222
  • ❌ Installation of air conditioning systems in industrial processes (e.g., factories) – code 3320
  • ❌ General construction works (construction sites) – code 4120
  • ❌ Installation of electrical systems (electrical installations, alarms) – code 4321

Întrebări Frecvente

What authorizations are required to work with this CAEN code?

For gas installations, an ANS (National Authority for Gas Systems) authorization and ISCIR certificate for pressurized installations are mandatory. For plumbing and HVAC installations, no special authorizations are required, but manufacturer certifications (e.g., Daikin, Viessmann) are recommended for warranties.

Can I invoice both materials and labor with this code?

Yes, the code allows both the supply of materials (pipes, fittings, equipment) and installation labor, provided that the main activity is installation. If you only sell materials without installation, a trade CAEN code (e.g., 4752) is needed.