CAEN Code Rev. 3

4323

Insulation works

EU NACE Equivalent: NACE Rev. 3 — 4323

CAEN code 4323 covers all thermal, sound and waterproofing insulation works for buildings and installations. Essentially, if your business involves installing mineral wool, polystyrene, polyurethane foam or other insulating materials on walls, roofs, pipes or tanks, this is the appropriate code. It includes both insulation of new buildings and thermal rehabilitation of existing ones.

Entrepreneur Profile

Acest cod este destinat firmelor specializate în izolații (termice, fonice, hidrofuge), fie că sunt SRL-uri mici care execută lucrări la case particulare, fie companii mai mari care participă la licitații pentru reabilitări termice de blocuri. De asemenea, este util pentru antreprenori individuali (PFA) care oferă servicii de izolare și impermeabilizare.

Who should avoid:

Avoid the exclusive use of code 4323 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.

Authorisation Procedure and Trade Register Aspects for CAEN 4323

For setting up a company that carries out insulation works (CAEN 4323), the first step is to check the availability of the company name at the Trade Register (ONRC) and draw up the constitutive documents. When drafting the articles of association, the main object of activity must be 'Insulation works' under CAEN code 4323. It is recommended to also include related secondary activities, such as 4120 (Construction of buildings) or 4399 (Other special construction works), without causing confusion with the main field.

The registration application is submitted to the Trade Register (ONRC) via the online portal or at the counter, accompanied by the affidavit under Law 359/2004. For this CAEN class, no prior operating permits are required, but it is mandatory to obtain a building permit issued by the local authorities for each work executed. Also, the company must have appropriate technical equipment and qualified personnel, and during the ONRC inspection, proof of professional qualifications (professional certificates) may be requested.

Registration costs include the registration fee, publication in the Official Gazette and the Trade Register fee (approximately 350-500 RON). The procedure duration is 2-5 working days if the documentation is complete. Subsequently, fiscal registration with the Tax Authority (ANAF) and submission of the fiscal registration statement (Form 070) is required to obtain the unique registration code.

Regulatory Framework, Specific Permits and Control Institutions

The activity of thermal, waterproofing or sound-absorbing insulation is carried out under Law 50/1991 on the authorisation of construction works and specific technical standards (e.g., the Normative on the design and execution of thermal insulations – C107/2005). For works involving hazardous materials (polyurethane foams, mineral wool with binders), the provisions of Government Decision 355/2007 on fire safety apply, and for exterior insulation on high-rise buildings, the approval of the Inspectorate for Emergency Situations (ISU) is required.

The main control institutions are: the State Inspectorate in Construction (ISC) for verifying compliance with technical norms, the Public Health Directorate (DSP) for hygiene conditions during material application, and the Environmental Guard (GNM) for managing construction waste. Contracts with clients must include clauses on the work guarantee (minimum 2 years under the Civil Code) and obligations regarding execution according to the authorised project.

A special license is not required for CAEN 4323, but for performing insulation work within electrical or thermal installations, certification from the National Regulatory Authority for Energy (ANRE) is required if acting on energy components. Also, hiring personnel without legal forms attracts severe penalties, making it mandatory to conclude individual employment contracts in accordance with the Labour Code.

Fiscal Management, ANAF Audit Risk and Specific Accounting

From a fiscal perspective, companies with CAEN 4323 must apply the VAT regime from setup if they exceed the exemption threshold (300,000 RON annual turnover). We recommend opting for VAT on collection in case of works with delayed payment, to avoid paying VAT to the budget before collection. Profit tax is calculated quarterly, and in the case of micro-enterprises, one may opt for income tax (1% or 3% as applicable).

VAT returns must be submitted monthly or quarterly, and for invoicing works, the RO e-Factura system is mandatory from 1 January 2023. ANAF may trigger a fiscal audit based on indications of understatement of income (undeclared works) or overstatement of expenses (fictitious materials). To minimise risk, keeping supporting documents is required: time sheets, route sheets, service contracts, material input-output notes.

Specific accounting reflects the production cycle: recording consumption for each site (account 601 materials expenses, account 641 salary expenses), including labour and machinery in production cost. At the end of the month, work-in-progress is inventoried (account 332) and costs are adjusted using production accounts. For contracts with execution longer than one year, IAS 11 (revenue recognition based on percentage of completion) applies.

In case of subcontracting part of the works to other companies, a 2% withholding tax is retained (Declaration 100) and the subcontractor's status is verified. Companies that deliver materials with installation must have CAEN 4323 as the main code, and invoicing is done with a single VAT rate (19% or 9% depending on the type of work – for example, insulation for social housing may benefit from the reduced rate).

We recommend that responsible persons periodically check the fiscal vector, submit the Single Declaration on estimated income and maintain a transparent relationship with ANAF to avoid sanctions. Implementing a rigorous internal control system, including checking client creditworthiness, reduces the risk of insolvency and increases the company's financial stability.


Included Activities

  • ✅ Thermal insulation works for buildings and installations
  • ✅ Sound insulation works for buildings and installations
  • ✅ Waterproofing insulation works for buildings and installations
  • ✅ Installation of insulating materials (mineral wool, polystyrene, polyurethane foam, cork, etc.) on walls, floors, roofs, pipes, tanks
  • ✅ Thermal insulation of facades (including ETICS systems)
  • ✅ Roof and terrace insulation
  • ✅ Insulation of heating, ventilation, hot water and cooling pipes
  • ✅ Insulation of tanks and boilers
  • ✅ Sound insulation works in partition walls, false ceilings, floors
  • ✅ Waterproofing of foundations, basement walls, terraces and balconies

Excluded Activities

  • ❌ Manufacture of insulating materials (CAEN codes 2399, 2223, etc.)
  • ❌ General construction works (CAEN code 4120)
  • ❌ Electrical, sanitary or HVAC installation works (CAEN codes 4321, 4322)
  • ❌ Interior finishing works (CAEN code 4330)
  • ❌ Waterproofing works for bridges, dams or other engineering constructions (CAEN code 4299)

Întrebări Frecvente

What authorisations are needed to work with CAEN code 4323?

For insulation works on buildings, no special authorisation from the State Inspectorate in Construction (ISC) is required, but fire safety regulations (fire-retardant materials) must be observed, and if working at height, an ISU permit for work at height is mandatory. Also, for thermal rehabilitation works financed from public funds, the company must be registered in the list of authorised contractors.

Can I invoice both materials and labour under the same CAEN code?

Yes, code 4323 allows invoicing both labour and materials used in the work, provided that the materials are incorporated into the work (e.g., installed mineral wool). If you sell only materials without installation, you need a trade CAEN code (4619, 4752, etc.).