---
title: "WILLIAMS MECHANICAL & SAFETY CONSTRUCTION SERVICES LTD — Ownership Dossier"
canonical: https://whiteintel.dev/entity/77b98ec1-4be0-5a42-8a79-034f8700d2d2
json: https://whiteintel.dev/api/public/dossier/77b98ec1-4be0-5a42-8a79-034f8700d2d2
identifier: oo:GB-COH-09624613
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# WILLIAMS MECHANICAL & SAFETY CONSTRUCTION SERVICES LTD

**Type:** Company  
**Jurisdiction:** GB  
**Identifier:** `oo:GB-COH-09624613`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/77b98ec1-4be0-5a42-8a79-034f8700d2d2  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/77b98ec1-4be0-5a42-8a79-034f8700d2d2  

## Ownership & control

### Owners / controllers

- **Mrs Claire Williams** (beneficial owner) — 50% — https://whiteintel.dev/entity/3c9e5ee5-dde4-5829-8a8f-a4352e0eddb2
- **Mr Mark Terence Williams** (beneficial owner) — 50% — https://whiteintel.dev/entity/29d788c6-31bf-54a9-a187-e861f01b4d1d
- **Mr Mark Terence Williams** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/a5e0f7d7-a3b9-4730-a0f9-fb8838b4b1b7
- **Mrs Claire Williams** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/152caf27-f102-43cb-a56a-5510666fcad7

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

1. **Mrs Claire Williams** — beneficial owner 50% → *WILLIAMS MECHANICAL & SAFETY CONSTRUCTION SERVICES LTD*
1. **Mr Mark Terence Williams** — beneficial owner 50% → *WILLIAMS MECHANICAL & SAFETY CONSTRUCTION SERVICES LTD*
1. **Mr Mark Terence Williams** — beneficial owner 37.5% → *WILLIAMS MECHANICAL & SAFETY CONSTRUCTION SERVICES LTD*
1. **Mrs Claire Williams** — beneficial owner 37.5% → *WILLIAMS MECHANICAL & SAFETY CONSTRUCTION SERVICES LTD*

## Company profile (live · UK Companies House)

- **Company number:** `09624613`
- **Status:** active
- **Type:** ltd
- **Incorporated:** 2015-06-04
- **Registered office:** 45 Gwaun-Bant, Pontycymer, Bridgend, CF32 8LN, Wales
- **SIC:** 74909

## Financials (Companies House accounts)

| Figure | 2025-06-30 | 2024-06-30 |
|---|---:|---:|
| Net assets | £443 | -£10,709 |
| Cash | £13,984 | £10,582 |
| Shareholder funds | £2 | £2 |
| Current assets | £13,984 | £10,746 |
| Employees | 2 | 2 |

_As filed at Companies House. Micro-entities file no profit-and-loss account._

### Officers

- WILLIAMS, Mark Terence — director · British · appointed 2015-06-04

### Beneficial owners (Persons with Significant Control)

- Mr Mark Terence Williams — 25–50% shares · individual PSC · Wales — since 2017-06-04
- Mrs Claire Williams — 25–50% shares · individual PSC · Wales — since 2017-06-04

## Provenance

- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/09624613
- companies_house_accounts — https://find-and-update.company-information.service.gov.uk/company/09624613/filing-history
- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/09624613

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **WILLIAMS MECHANICAL & SAFETY CONSTRUCTION SERVICES LTD**. Human view: https://whiteintel.dev/entity/77b98ec1-4be0-5a42-8a79-034f8700d2d2 · Structured JSON: https://whiteintel.dev/api/public/dossier/77b98ec1-4be0-5a42-8a79-034f8700d2d2._

_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"._