---
title: "SIRETT BUILDERS LIMITED — Ownership Dossier"
canonical: https://whiteintel.dev/entity/0db016fd-3a3f-5eac-87b0-3a378301dc7c
json: https://whiteintel.dev/api/public/dossier/0db016fd-3a3f-5eac-87b0-3a378301dc7c
identifier: oo:GB-COH-07623472
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# SIRETT BUILDERS LIMITED

**Type:** Company  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `oo:GB-COH-07623472`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/0db016fd-3a3f-5eac-87b0-3a378301dc7c  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/0db016fd-3a3f-5eac-87b0-3a378301dc7c  

## Ownership & control

### Owners / controllers

- **Mr Colin Callingham** (beneficial owner) — 50% — https://whiteintel.dev/entity/af996953-03f7-53d4-acca-88c6bcf78d7c
- **Mr William James Sirett** (beneficial owner) — 50% — https://whiteintel.dev/entity/b04077b2-aa32-545c-87cd-9d15187fea8d
- **Mr Martin James Sirett** (beneficial owner) — 50% — https://whiteintel.dev/entity/2b0a60b9-b771-57a2-a886-c2b8b877d426
- **Mr Colin Callingham** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/e51ea6f8-549d-438f-9538-818e10a1e1cf
- **Mr William James Sirett** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/22f13370-bd00-4911-b873-a7e642753f2e
- **Mr Martin James Sirett** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/c396c044-d9c1-40b1-b364-6b10513ab79f

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

A **6-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.

## Provenance

- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/07623472
- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/07623472

## Get the full, resolved dossier (agent-callable)

The above is the free teaser. The resolved **multi-hop UBO chain**, ownership **%**, full **financial history**, itemised **assets** and the hop-by-hop **exposure path** are the paid depth — callable as tools from your agent:

```bash
npx -y @whiteintel/mcp-server   # then: get_dossier · trace_ownership_path · check_offshore_exposure
```

Or unlock a one-off cited dossier for **SIRETT BUILDERS LIMITED** — https://whiteintel.dev/entity/0db016fd-3a3f-5eac-87b0-3a378301dc7c · pricing https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **SIRETT BUILDERS LIMITED**. Human view: https://whiteintel.dev/entity/0db016fd-3a3f-5eac-87b0-3a378301dc7c · Structured JSON: https://whiteintel.dev/api/public/dossier/0db016fd-3a3f-5eac-87b0-3a378301dc7c._

_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"._