---
title: "BIRCH STREET CONSTRUCTION LIMITED — Ownership Dossier"
canonical: https://whiteintel.dev/entity/51d0a389-d9ea-5aba-b440-cb34dcbe9693
json: https://whiteintel.dev/api/public/dossier/51d0a389-d9ea-5aba-b440-cb34dcbe9693
identifier: oo:GB-COH-10377907
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# BIRCH STREET CONSTRUCTION LIMITED

**Type:** Company  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `oo:GB-COH-10377907`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/51d0a389-d9ea-5aba-b440-cb34dcbe9693  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/51d0a389-d9ea-5aba-b440-cb34dcbe9693  

## Ownership & control

### Owners / controllers

- **Mr Marek Kosmala** (beneficial owner) — 50% — https://whiteintel.dev/entity/446e5972-b15a-51bd-8d8e-58551e6f437e
- **Mr. Zbigniew Henryk Zych** (beneficial owner) — 50% — https://whiteintel.dev/entity/a48dc43c-5fff-5a24-9cdc-9058070338ec
- **Mr. Zbigniew Henryk Zych** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/41223fa5-6dac-4262-8431-f0614701a8b1
- **Mr Marek Kosmala** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/e0abf03a-2a47-4789-8d0a-5481aa5e2ab3

### UBO chain (walk to the ultimate owner)

A **4-step** ownership/control chain to the ultimate beneficial owner is resolved for this entity. The full cited chain unlocks with a paid API key or a one-off dossier — https://whiteintel.dev/pricing.

## Company profile (live · UK Companies House)

- **Company number:** `10377907`
- **Status:** active
- **Type:** ltd
- **Incorporated:** 2016-09-15
- **Registered office:** 34 Hydes Road, Wednesbury, WS10 9SY, England
- **SIC:** 43999

### Officers

- KOSMALA, Marek — director · Polish · appointed 2016-09-15
- ZYCH, Zbigniew Henryk, Mr. — director · Polish · appointed 2016-09-15

### Beneficial owners (Persons with Significant Control)

- Mr Marek Kosmala — 25–50% shares · individual PSC · United Kingdom — since 2016-09-15
- Mr. Zbigniew Henryk Zych — 25–50% shares · individual PSC · United Kingdom — since 2016-09-15

## Provenance

- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/10377907
- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/10377907

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **BIRCH STREET CONSTRUCTION LIMITED**. Human view: https://whiteintel.dev/entity/51d0a389-d9ea-5aba-b440-cb34dcbe9693 · Structured JSON: https://whiteintel.dev/api/public/dossier/51d0a389-d9ea-5aba-b440-cb34dcbe9693._

_Risk levels are heuristic investigative leads, not legal determinations of beneficial ownership. Every claim carries a source; an absent edge means "not yet observed in current sources", not "does not exist"._