- Companies
- Specialist contractors
- London
- Certiserv Ltd
Certiserv Ltd
- Company number
- 16116371
- Incorporated
- 3 Dec 20241 year trading
- Registered office
- 124-128 City Road, London, EC1V 2NX
- Nature of business
- Other specialised construction activities n.e.c.
Certiserv Ltd is a 1-year-old private limited company registered in London, company number 16116371, one of 4,318 specialist construction companies in London. Companies House shows its accounts as overdue: they were due on 3 September 2026.
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.
Is this your company?
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Where Certiserv Ltd is registered
The registered office is in London (EC1V), in the Islington local authority area, London. Show EC1V 2NX on a map.
Other trade companies in EC1V
- Cardiff Electrical Solutions LtdElectricians
- Edemis Construction LtdBuilders
- Zaylan LtdProperty developers
- Pronto Roofing and Construction LtdRoofers
- Instal Systems LtdPlumbers and heating engineers
- J&R Partners LtdBuilders
- The Tile Craft LtdFinishing trades
- Cathal Od Solutions LtdSpecialist contractors
Shared registered office
355 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 Certiserv Ltd files late
If the accounts reach Companies House today, the late filing penalty is £375 (£750 if last year's accounts were also late). It rises at each step below.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 4 Sep 2026 to 3 Oct 2026 | £150 |
| 1 to 3 months late | 4 Oct 2026 to 3 Dec 2026 | £375 |
| 3 to 6 months late | 4 Dec 2026 to 3 Mar 2027 | £750 |
| More than 6 months late | From 4 Mar 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2027 | £200 |
| 3 months late | 31 Mar 2027 | another £200 |
| 6 months late | 30 Jun 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 2027 | 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
- 16116371
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 3 December 2024 (1 year ago)
- Registered office
- 124-128 City Road, London, EC1V 2NX
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 December (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 2 December 2025
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.
- Cfa Creative Ltd2011
- CG Bathrooms Limited2025
- CGB FM Ltd2025
- CH Contractors Ltd2026
- Chai Management Ltd2017
- Chalk Line Tiling Ltd2025
- Chamb Installation Ltd2019
- Champion Building Services Limited2004
All specialist construction companies in London · All trades in London · Specialist contractors across the UK
Frequently asked questions
When are Certiserv Ltd's accounts due?
Certiserv Ltd's accounts were due at Companies House on 3 September 2026 and the register shows them as overdue.
When is Certiserv 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 2 December 2025, due by 2 December 2026, and one for the period to 31 December 2025, due by 31 December 2026. Corporation tax is payable 9 months and 1 day after the end of each.
Is Certiserv Ltd still trading?
Certiserv Ltd is listed as active on the Companies House register (checked 12 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 Certiserv Ltd do?
Certiserv Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Certiserv Ltd?
Certiserv Ltd was incorporated on 3 December 2024, 1 year ago.
What is the penalty if Certiserv 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 Certiserv Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 12 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.