Overview
Inst-Sanit Sieci is a general contractor for sanitary and mechanical installations, operating since 1991. It builds and renovates heating, plumbing, fire protection, gas, cooling, air-conditioning and ventilation systems, and also prepares technical designs and investment cost estimates. Its projects include shopping centres, schools, hospitals, warehouses, production halls and residential buildings.
- ul. Bolesława Krzywoustego 79/1, 70-245 Szczecin
Industry
Offer
- Heating systems
- Water and sewer systems
- Fire protection systems
- Gas installations
- Refrigeration systems
- Ventilation systems
- Technical designs
Authorized Representatives
Manner of representation
Each member of the management board is authorized to make declarations on behalf of the company independently.
Ownership
| Owner | Shares | Share value | Stake |
|---|---|---|---|
Katarzyna Aldona Kalkowskaage 46 | 50 | $675.31 | 50% |
Paweł Kalkowskiage 47 | 50 | $675.31 | 50% |
Katarzyna Aldona Kalkowska and Paweł Kalkowski hold a combined 100% – the ownership structure indicates family control.
Beneficial owners
| Person | Rights |
|---|---|
Bank accounts
Registered as a VAT taxpayer on 2025-09-04.
03 1240 1112 1111 0011 5861 9366
Debt
No entries in the National Debtors Register (KRZ).
Public aid
No public aid cases recorded in the last 10 years.
Competitors
| Name | Revenue | Website | ||
|---|---|---|---|---|
| Instalnikasp. z o.o. | $66,209,336.40 | instalnika.pl | ||
| Inst-Sanitsp. z o.o. | $14,826,096.73 | inst-sanit.pl | ||
| Instersp. z o.o. | $4,958,697.53 | inster.pl | ||
| Sanfachsp. z o.o. | $2,932,349.39 | sanfach.pl | ||
| Clima Hitsp. z o.o. + limited partnership | $2,698,483.49 | climahit.pl | ||
| Hydro-Projectsp. z o.o. | $2,431,337.91 | hydro-project.pl | ||
| Isstssp. z o.o. | $2,142,567.58 | issts.pl | ||
| Ekosanitsp. z o.o. | $1,755,435.91 | ekosanit.com | ||
| Cool Pro Sanitarysp. z o.o. | $1,283,461.22 | coolpro.pl | ||
| Klimaksp. z o.o. | $680,258.57 | klimak.pl |
FAQ
Last updated: 2026-04-22