- Companies
- Plumbers and heating engineers
- London
- Onyx Electrical & Plumbing Ltd
Onyx Electrical & Plumbing Ltd
- Company number
- 17357194
- Incorporated
- 23 Jul 2026
- Registered office
- No 66 Paul Street, London, EC2A4NA
- Nature of business
- Plumbing, heat and air-conditioning installation
Onyx Electrical & Plumbing Ltd is a newly incorporated private limited company registered in London, company number 17357194, one of 2,972 plumbing and heating companies in London. Its next accounts are due at Companies House on 23 April 2028, and its first CT600 is due at HMRC on 22 July 2028.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
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Where Onyx Electrical & Plumbing Ltd is registered
The registered office is in London (EC2A). Show EC2A4NA on a map.
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What happens if Onyx Electrical & Plumbing 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 23 April 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 24 Apr 2028 to 23 May 2028 | £150 |
| 1 to 3 months late | 24 May 2028 to 23 Jul 2028 | £375 |
| 3 to 6 months late | 24 Jul 2028 to 23 Oct 2028 | £750 |
| More than 6 months late | From 24 Oct 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Aug 2028 | £200 |
| 3 months late | 31 Oct 2028 | another £200 |
| 6 months late | 31 Jan 2029 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jul 2029 | 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
- 17357194
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 23 July 2026
- Registered office
- No 66 Paul Street, London, EC2A4NA
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 July (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for plumbing and heating companies
Plumbing and heating companies frequently work under CIS for main contractors and also directly for homeowners, so turnover can mix CIS and non-CIS income.
Similar companies in London
Other active plumbing and heating companies registered in London.
- Onyx Heating and Plumbing Ltd2026
- Optimal Engineering Ltd2024
- Optimal Transformation Firm Ltd2021
- Optimo Services Limited2025
- Optimum Flow Ltd2016
- Optimus Ecoheat Ltd2025
- Optimus Property Maintenance Ltd2021
- Orange Correct Solutions Limited2020
All plumbing and heating companies in London · All trades in London · Plumbers and heating engineers across the UK
Frequently asked questions
When are Onyx Electrical & Plumbing Ltd's accounts due?
Onyx Electrical & Plumbing Ltd's next accounts are due at Companies House by 23 April 2028 (in 558 days), covering the period to 31 July 2027.
When is Onyx Electrical & Plumbing 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 22 July 2027, due by 22 July 2028, and one for the period to 31 July 2027, due by 31 July 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Onyx Electrical & Plumbing Ltd still trading?
Onyx Electrical & Plumbing 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 Electrical & Plumbing Ltd do?
Onyx Electrical & Plumbing Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Onyx Electrical & Plumbing Ltd?
Onyx Electrical & Plumbing Ltd was incorporated on 23 July 2026, less than a year ago.
What is the penalty if Onyx Electrical & Plumbing 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 Electrical & Plumbing 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.