- Companies
- Specialist contractors
- London
- Certfix Ltd
Certfix Ltd
- Company number
- 17025452
- Incorporated
- 10 Feb 2026
- Registered office
- 50 ST. Marys Crescent, London, NW4 4LH
- Nature of business
- Other specialised construction activities n.e.c.
Certfix Ltd is a newly incorporated private limited company registered in London, company number 17025452, one of 4,318 specialist construction companies in London. Its next accounts are due at Companies House on 10 November 2027, and its first CT600 is due at HMRC on 9 February 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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Who runs and owns Certfix Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officer
| Name | Role | Appointed |
|---|---|---|
| R*** L*** | Director | Feb 2026 |
Person with significant control
Where Certfix Ltd is registered
The registered office is in London (NW4), in the Barnet local authority area, London. Show NW4 4LH on a map.
Other trade companies in NW4
- City Flow Plumbing & Heating 1 LtdPlumbers and heating engineers
- Avenhall LimitedBuilders
- Steamdeep Cleaning LtdCleaning companies
- Westchester Services LimitedFacilities management
- Amier LtdBuilders
- Remmets LtdProperty developers
- Solar Nest LtdElectricians
- Cranko Construction LtdFinishing trades
Shared registered office
31 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 Certfix 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 10 November 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 11 Nov 2027 to 10 Dec 2027 | £150 |
| 1 to 3 months late | 11 Dec 2027 to 10 Feb 2028 | £375 |
| 3 to 6 months late | 11 Feb 2028 to 10 May 2028 | £750 |
| More than 6 months late | From 11 May 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 29 Feb 2028 | £200 |
| 3 months late | 28 May 2028 | another £200 |
| 6 months late | 28 Aug 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 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
- 17025452
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 February 2026
- Registered office
- 50 ST. Marys Crescent, London, NW4 4LH
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 28 February (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.
- Certiplan Works Ltd2026
- Certiserv Ltd2024
- Cfa Creative Ltd2011
- CG Bathrooms Limited2025
- CGB FM Ltd2025
- CH Contractors Ltd2026
- Chai Management Ltd2017
- Chalk Line Tiling Ltd2025
All specialist construction companies in London · All trades in London · Specialist contractors across the UK
Frequently asked questions
When are Certfix Ltd's accounts due?
Certfix Ltd's next accounts are due at Companies House by 10 November 2027 (in 394 days), covering the period to 28 February 2027.
When is Certfix 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 9 February 2027, due by 9 February 2028, and one for the period to 28 February 2027, due by 28 February 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Certfix Ltd still trading?
Certfix 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 Certfix Ltd do?
Certfix Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Certfix Ltd?
Certfix Ltd was incorporated on 10 February 2026, less than a year ago.
Who runs Certfix Ltd?
Certfix Ltd has 1 active director, the longest-serving appointed in Feb 2026. Their names and service addresses are on the Companies House register.
Who owns Certfix Ltd?
One person or company has significant control of Certfix Ltd: an individual (owns 75% or more of the shares).
What is the penalty if Certfix 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 Certfix 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.