- Company number
- 13814300
- Incorporated
- 22 Dec 20214 years trading
- Registered office
- 30 Paget Road, London, N16 5NQ
- Nature of business
- Construction of domestic buildings; Other building completion and finishing; Other specialised construction activities n.e.c.
Onyx Improvements Ltd is a 4-year-old private limited company registered in London, company number 13814300, one of 12,075 building contractors in London. Its next accounts are due at Companies House on 29 December 2026, and its first CT600 is due at HMRC on 31 December 2026.
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 £1,358 (+445.2%) on the year before, to £1,053.
- Current assets of £100K against £108K owed within a year: 0.9 times cover.
- 5 employees on average, down from 6 the year before.
- Balance sheets on record for 3 years, 2022 to 2024.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2024 | £1,053 | £20K | £100K | £108K | 5 |
| 31 Dec 2023 | -£305 | £6,645 | £78K | £89K | 6 |
| 31 Dec 2022 | £3,952 | £18K | £47K | £56K | 6 |
Where Onyx Improvements Ltd is registered
The registered office is in London (N16), in the Hackney local authority area, London. Show N16 5NQ on a map.
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Also registered at this address
1 other company uses the same registered office as Onyx Improvements Ltd.
- Tyre Care (UK) LtdMotor traders
What happens if Onyx Improvements Ltd 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 29 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 30 Dec 2026 to 29 Jan 2027 | £150 |
| 1 to 3 months late | 30 Jan 2027 to 29 Mar 2027 | £375 |
| 3 to 6 months late | 30 Mar 2027 to 29 Jun 2027 | £750 |
| More than 6 months late | From 30 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 30 Mar 2027 | £200 |
| 3 months late | 29 Jun 2027 | another £200 |
| 6 months late | 29 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 29 Mar 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
- 13814300
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 22 December 2021 (4 years ago)
- Registered office
- 30 Paget Road, London, N16 5NQ
- Nature of business
- Construction of domestic buildings (SIC 41202)
Other building completion and finishing (SIC 43390)
Other specialised construction activities n.e.c. (SIC 43999) - Year end
- 29 December (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 December 2024
- Last confirmation statement
- 10 February 2026
Filing notes for building contractors
Building companies often run the Construction Industry Scheme as a contractor, a subcontractor or both. CIS deductions suffered during the year are set against the PAYE bill, and any unrecovered balance at the year end matters when the accounts are drawn up.
Similar companies in London
Other active building contractors registered in London.
- Onyx Renovation & Design Ltd2024
- Opc Developments Limited2026
- Opek Home Ltd.2016
- Open Construction Ltd2020
- Open Plan Interior Development Ltd2017
- Open Wharf Limited2020
- Opls Driveways & Landscapes Ltd2025
- Oprm Property Services Ltd2025
All building contractors in London · All trades in London · Builders across the UK
Frequently asked questions
When are Onyx Improvements Ltd's accounts due?
Onyx Improvements Ltd's next accounts are due at Companies House by 29 December 2026 (in 77 days), covering the period to 29 March 2026.
When is Onyx Improvements Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 31 December 2025, due by 31 December 2026, and one for the period to 29 March 2026, due by 29 March 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Onyx Improvements Ltd still trading?
Onyx Improvements Ltd 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 Onyx Improvements Ltd do?
Onyx Improvements Ltd is registered under Construction of domestic buildings (SIC 41202); Other building completion and finishing (SIC 43390); Other specialised construction activities n.e.c. (SIC 43999).
How old is Onyx Improvements Ltd?
Onyx Improvements Ltd was incorporated on 22 December 2021, 4 years ago.
What is the penalty if Onyx Improvements Ltd 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 Onyx Improvements Ltd 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.