Overview
Kosay specializes in building thermal upgrades and the installation of heating and energy systems, including heat pumps, solar panels and energy storage. The company selects, installs and services pellet boilers and stoves and wood gasification boilers, replaces windows and doors, insulates buildings and helps clients obtain grants.
Financials
Revenue history (in k)
Filing timeliness
3 of 3 financial statements were filed late (the longest delay 378 days for 2024).
- 202524/07/2026
- 202428/07/2026
- 202316/07/2024
Data and insights are generated automatically from financial statements – they may contain errors and are neither a credit assessment nor business advice.
Statistics
How the company ranks by revenue within its industry, region and across Poland in 2025.
Results vs industry
Industry
Offer
- Heat pump installation
- Photovoltaic installations
- Energy storage systems
- Pellet boilers
- Wood gasification boilers
- Thermal modernization
- Building insulation
- Facade installation
Website technology
- Website
- WordPress
- Elementor
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 |
|---|---|---|---|
Daniel Kostrzewaage 29 | 50 | $675.31 | 50% |
Paweł Kostrzewaage 35 | 50 | $675.31 | 50% |
Daniel Kostrzewa and Paweł Kostrzewa hold a combined 100% – the ownership structure indicates family control.
Beneficial owners
| Person | Rights |
|---|---|
Bank accounts
Registered as a VAT taxpayer on 2023-02-09.
48 1020 3613 0000 6202 0164 6660
Debt
No entries in the National Debtors Register (KRZ).
Public aid
| Grant date | Purpose | Gross amount | Granting body | |
|---|---|---|---|---|
| Feb 20, 2026 | De minimis aid (in accordance with Commission Regulation 2023/2831) | $2,701$2,701 | Prezes Banku Gospodarstwa Krajowego | |
| Feb 20, 2025 | De minimis aid (in accordance with Commission Regulation 2023/2831) | $2,511$2,511 | Prezes Banku Gospodarstwa Krajowego |
Regulatory authorisations
| Authority | Type | Status | |
|---|---|---|---|
 KNF | Consumer credit intermediary | Active |
Competitors
| Name | Revenue | Website | ||
|---|---|---|---|---|
| Homesaversp. z o.o. | $3,261,506.28 | homesaver.pl | ||
| Czempassp. z o.o. | $2,018,186.75 | czempas.pl | ||
| Sawbarsp. z o.o. | $1,563,973.43 | sawbar.pl | ||
| Persemsp. z o.o. | $1,222,628.08 | persem.pl | ||
| Bskomfortsp. z o.o. | $1,222,005.94 | bskomfort.pl | ||
| ON Technologysp. z o.o. | $1,126,586.47 | ontechnology.pl | ||
| Polska Grupa Termomodernizacyjnasp. z o.o. | $1,047,280.89 | pgtermo.pl | ||
| Zgodny Ze Sztukąsp. z o.o. | $1,027,723.22 | zgodnyzesztuka.pl | ||
| Heat Energysp. z o.o. | $682,095.40 | heat-energy.pl | ||
| Ogrzewaniedomu24sp. z o.o. | $604,329.27 | ogrzewaniedomu24.pl |
FAQ
Last updated: 2026-07-28