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Company number
08159144

THE CONSTRUCTION SECTOR TRANSPARENCY INITIATIVE

Active
✓ Active company on the official register. Next accounts due 30 September 2026.

Company details

London, England Contains OS data © Crown copyright and database right. Contains Royal Mail data © Royal Mail copyright and database right. Source: Office for National Statistics licensed under the Open Government Licence v.3.0.
Registered name
THE CONSTRUCTION SECTOR TRANSPARENCY INITIATIVE
Company number
08159144
Registered office
167-169 GREAT PORTLAND STREET, LONDON, ENGLAND, W1W 5PF, UNITED KINGDOM · 32,257 other companies at this postcode
Company type
PRI/LBG/NSC (Private, Limited by guarantee, no share capital, use of 'Limited' exemption)
Incorporated on
27 July 2012
Status
Active
Age
14 years
Nature of business (SIC)
94990 — Activities of other membership organisations n.e.c.
Accounts — next due
30 Sept 2026
Accounts — last made up to
31 Dec 2024
Confirmation statement — next due
11 Oct 2026
Confirmation statement — last
27 Sept 2025

Registered charity

This company is also on the Charity Commission's register of England and Wales. The register records the company number itself, so this is not a match on the name.

THE CONSTRUCTION SECTOR TRANSPARENCY INITIATIVE
Charity 1152236 · Charitable company · registered 31 May 2013
Latest reported income £1,791,554
Charity Commission record ↗

People with significant control

Beneficial owners holding over 25% of shares, voting rights or the right to appoint directors

Mr Christiaan Poortman
has significant influence or control
Notified 06/04/2016

Corporate structure

Who controls this company, and who they control in turn

1 controller Drag to move · scroll to zoom · double-click to expand
Company Person Current control Ended

Connections

Mr Christiaan Poortman
born 07/1976 · United States has significant influence or control Control ended 30/06/2025

Change history

Reconstructed from the dated records Companies House publishes

DateChangeWasNow
30/06/2025 Person with significant control ceased Mr Christiaan Poortman
06/04/2016 Person with significant control added Mr Christiaan Poortman

Financial highlights

Parsed from the filed statutory accounts (£ thousands, except employees)

Source: Companies House bulk data filed accounts (iXBRL)
Metric FY2024FY2023
Total assets less current liabilities 206
▼ 9.7%
228
Net assets 206
▼ 9.7%
228
Employees (avg) 0 0

Documents for THE CONSTRUCTION SECTOR TRANSPARENCY INITIATIVE

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Company extract£1.99

The full registration record as held today — name, number, status, registered office, company type, previous names, officers, PSC and SIC codes, timestamped for your file.

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Financial statements£3.99

Every figure the company’s own accounts state, across each filed period, with year-on-year movement. Most UK companies file small or micro-entity accounts — a balance sheet and a headcount, no turnover or profit.

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Ownership report£3.99

Who controls the company: persons with significant control, the nature of that control, the ownership graph and every other company those controllers hold.

PDF Order

Data protection register

No entry found on the ICO register of fee payers under this name.

Not every organisation has to register — some are exempt. An absent entry is a question to ask, not a finding.

Get this company via API

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Frequently asked questions

What is the company number of THE CONSTRUCTION SECTOR TRANSPARENCY INITIATIVE?
According to the official registry, the company number of THE CONSTRUCTION SECTOR TRANSPARENCY INITIATIVE is 08159144.
Where is THE CONSTRUCTION SECTOR TRANSPARENCY INITIATIVE registered?
The registered office is 167-169 GREAT PORTLAND STREET, LONDON, ENGLAND, W1W 5PF, UNITED KINGDOM.
What is the SIC code of THE CONSTRUCTION SECTOR TRANSPARENCY INITIATIVE?
The nature of business is recorded under SIC code 94990 — Activities of other membership organisations n.e.c..
Who controls THE CONSTRUCTION SECTOR TRANSPARENCY INITIATIVE?
Mr Christiaan Poortman is recorded as a person with significant control, and has significant influence or control.
When are the next accounts of THE CONSTRUCTION SECTOR TRANSPARENCY INITIATIVE due?
The next annual accounts are due by 30 September 2026, and the last accounts were made up to 31 December 2024.

About THE CONSTRUCTION SECTOR TRANSPARENCY INITIATIVE (08159144)

THE CONSTRUCTION SECTOR TRANSPARENCY INITIATIVE is a pri/lbg/nsc (private, limited by guarantee, no share capital, use of 'limited' exemption) incorporated on 27 July 2012 and registered in the United Kingdom under company number 08159144. Its registered office is at 167-169 GREAT PORTLAND STREET, LONDON, ENGLAND, W1W 5PF, UNITED KINGDOM. The recorded nature of business is activities of other membership organisations n.e.c. (SIC 94990). The company is currently active , with statutory accounts last made up to 31 December 2024. , and the person with significant control is Mr Christiaan Poortman. This profile is provided by opendata.bot by Noetikos, aggregating official data from Companies House bulk data , last refreshed 2 September 2026.

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