- Companies
- Specialist contractors
- London
- Certiplan Works Ltd
Certiplan Works Ltd
- Company number
- 17084190
- Incorporated
- 11 Mar 2026
- Registered office
- 178 Hermitage Road, London, N4 1NL
- Nature of business
- Other specialised construction activities n.e.c.
Certiplan Works Ltd is a newly incorporated private limited company registered in London, company number 17084190, one of 4,318 specialist construction companies in London. Its next accounts are due at Companies House on 11 December 2027, and its first CT600 is due at HMRC on 10 March 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 Certiplan Works Ltd is registered
The registered office is in London (N4), in the Haringey local authority area, London. Show N4 1NL on a map.
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What happens if Certiplan Works 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 11 December 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 12 Dec 2027 to 11 Jan 2028 | £150 |
| 1 to 3 months late | 12 Jan 2028 to 11 Mar 2028 | £375 |
| 3 to 6 months late | 12 Mar 2028 to 11 Jun 2028 | £750 |
| More than 6 months late | From 12 Jun 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 17084190
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 11 March 2026
- Registered office
- 178 Hermitage Road, London, N4 1NL
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 March (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in London
Other active specialist construction companies registered in London.
- Certiserv Ltd2024
- Cfa Creative Ltd2011
- CG Bathrooms Limited2025
- CGB FM Ltd2025
- CH Contractors Ltd2026
- Chai Management Ltd2017
- Chalk Line Tiling Ltd2025
- Chamb Installation Ltd2019
All specialist construction companies in London · All trades in London · Specialist contractors across the UK
Frequently asked questions
When are Certiplan Works Ltd's accounts due?
Certiplan Works Ltd's next accounts are due at Companies House by 11 December 2027 (in 425 days), covering the period to 31 March 2027.
When is Certiplan Works 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 10 March 2027, due by 10 March 2028, and one for the period to 31 March 2027, due by 31 March 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Certiplan Works Ltd still trading?
Certiplan Works 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 Certiplan Works Ltd do?
Certiplan Works Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Certiplan Works Ltd?
Certiplan Works Ltd was incorporated on 11 March 2026, less than a year ago.
What is the penalty if Certiplan Works 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 Certiplan Works 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.