- Companies
- Property developers
- Covent Garden
- Blackonyx Limited
Blackonyx Limited
- Company number
- 06500366
- Incorporated
- 11 Feb 200818 years trading
- Registered office
- 5TH Floor 16 Great Queen Street, Covent Garden, London, WC2B 5DG
- Nature of business
- Development of building projects
Blackonyx Limited is a 18-year-old private limited company registered in Covent Garden, company number 06500366, one of 941 property development companies in Covent Garden. Its next accounts are due at Companies House on 31 October 2026, and the CT600 for the period to 31 January 2026 is due at HMRC on 31 January 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets up £5,535 (+53.3%) on the year before, to -£4,848.
- Net assets rose in 6 of 9 year-on-year comparisons on record.
- Current assets of £668K against £695K owed within a year: 1.0 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jan 2025 | -£4,848 | £28K | £668K | £695K | 0 |
| 31 Jan 2024 | -£10K | £30K | £305K | £322K | 6 |
| 31 Jan 2023 | -£14K | £33K | £110K | £134K | 5 |
| 31 Jan 2022 | -£55K | £5,852 | £123K | £178K | 5 |
| 31 Jan 2021 | £311K | £5,251 | £825K | £513K | 2 |
| 31 Jan 2020 | £102K | £1,120 | £266K | £167K | 2 |
| 31 Jan 2019 | £165K | £5,727 | £116K | £158K | |
| 31 Jan 2018 | £1.7M | £4,157 | £1.6M | £1.1M | |
| 31 Jan 2017 | £1.6M | £30K | £967K | £423K | |
| 31 Jan 2016 | £1.4M | £2,078 | £1.8M | £1.2M |
Who runs and owns Blackonyx Limited
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (2)
| Name | Role | Appointed |
|---|---|---|
| D*** A*** | Director | Mar 2008 |
| C*** K*** | Director | Mar 2020 |
5 former officers
| Name | Role | Appointed | Left |
|---|---|---|---|
| Form 10 Secretaries Fd Ltd | Corporate Nominee Secretary | Feb 2008 | Feb 2008 |
| H*** B*** | Director | Mar 2009 | Sep 2024 |
| R*** L*** | Director | Dec 2012 | Feb 2020 |
| C*** V*** | Director | Sep 2015 | Mar 2017 |
| Form 10 Directors Fd Ltd | Nominee director (company) | Feb 2008 | Feb 2008 |
Person with significant control
Charges (secured borrowing)
All 1 registered charge has been satisfied. A charge is security a lender takes over a company's assets, typically for a loan, mortgage or asset finance.
| Lender | Status | Registered |
|---|---|---|
| A private lender | Satisfied Nov 2016 | Feb 2009 |
Where Blackonyx Limited is registered
The registered office is in Covent Garden (WC2B), in the Camden local authority area, London. Show WC2B 5DG on a map.
Other trade companies in WC2B
- Ozak Real Estate Development LtdProperty developers
- MRP Holliday LimitedProperty developers
- Cascades Developments LtdProperty developers
- Ors Motors LimitedMotor traders
- H2O and More LtdPlumbers and heating engineers
- Jfwplumbing LimitedPlumbers and heating engineers
- Golden Cab Hire LtdMechanics and garages
- Ed Property Development LtdProperty developers
Shared registered office
44 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if Blackonyx Limited files late
Companies House charges an automatic penalty the day after the deadline, and it rises the longer the accounts are late. These are the dates for this company's accounts due on 31 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Nov 2026 to 30 Nov 2026 | £150 |
| 1 to 3 months late | 1 Dec 2026 to 31 Jan 2027 | £375 |
| 3 to 6 months late | 1 Feb 2027 to 30 Apr 2027 | £750 |
| More than 6 months late | From 1 May 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2027 | £200 |
| 3 months late | 30 Apr 2027 | another £200 |
| 6 months late | 31 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 2028 | another 10% of any unpaid tax |
For returns filed on or after 1 April 2026. Late three times in a row and the £200 penalties become £1,000 each.
Company details
As held on the Companies House register.
- Company number
- 06500366
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 11 February 2008 (18 years ago)
- Registered office
- 5TH Floor 16 Great Queen Street, Covent Garden, London, WC2B 5DG
- Nature of business
- Development of building projects (SIC 41100)
- Year end
- 31 January (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 January 2025
- Last confirmation statement
- 14 January 2026
- Charges (mortgages)
- 0 outstanding of 1 registered
Filing notes for property development companies
Many property development companies are single-project vehicles. Stock of land and buildings sits on the balance sheet as work in progress until sale, and a company that has finished its project may become dormant rather than close.
Similar companies in Covent Garden
Other active property development companies registered in Covent Garden.
- Blackonyx Projects Ltd2018
- Blackonyx WL Limited2018
- Blackstone Languages Limited2025
- Blue Cedars Development Ltd2023
- Blue Lotus Developments Ltd2019
- Bluedoor Property Services Ltd2024
- Blueprint Construction & Management Ltd2024
- BN Interiors Ltd2018
All property development companies in Covent Garden · All trades in Covent Garden · Property developers across the UK
Frequently asked questions
When are Blackonyx Limited's accounts due?
Blackonyx Limited's next accounts are due at Companies House by 31 October 2026 (in 19 days), covering the period to 31 January 2026.
When is Blackonyx Limited's CT600 due?
The CT600 for the period to 31 January 2026 is due at HMRC by 31 January 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 November 2026.
Is Blackonyx Limited still trading?
Blackonyx Limited is listed as active on the Companies House register as of 1 Oct 2026. Active means it has not been dissolved or entered insolvency; it does not show whether it is currently taking on work.
What does Blackonyx Limited do?
Blackonyx Limited is registered under Development of building projects (SIC 41100).
How old is Blackonyx Limited?
Blackonyx Limited was incorporated on 11 February 2008, 18 years ago.
Who runs Blackonyx Limited?
Blackonyx Limited has 2 active directors, the longest-serving appointed in Mar 2008. Their names and service addresses are on the Companies House register.
Who owns Blackonyx Limited?
One person or company has significant control of Blackonyx Limited: Blackonyx Capital Ltd (owns 50% to 75% of the shares).
What is the penalty if Blackonyx Limited files its accounts late?
Companies House charges £150 if the accounts are up to 1 month late, £375 up to 3 months, £750 up to 6 months and £1,500 after that, doubled if the previous year's accounts were also late. HMRC charges £200 for a CT600 filed a day late and another £200 at 3 months.
Official records
View Blackonyx Limited on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026). Deadlines are worked out from the register and assume a standard accounting period; a change of year end or a short period moves them. This page is general information, not tax or accountancy advice.