- Companies
- Civil engineering
- London
- Ctlo Ltd
Ctlo Ltd
- Company number
- 16456701
- Incorporated
- 19 May 20251 year trading
- Registered office
- 124 City Road, London, EC1V 2NX
- Nature of business
- Construction of railways and underground railways
Ctlo Ltd is a 1-year-old private limited company registered in London, company number 16456701, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 19 February 2027, and its first CT600 is due at HMRC on 18 May 2027.
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 Ctlo Ltd is registered
The registered office is in London (EC1V), in the Islington local authority area, London. Show EC1V 2NX on a map.
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Shared registered office
1,047 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 Ctlo 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 19 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 20 Feb 2027 to 19 Mar 2027 | £150 |
| 1 to 3 months late | 20 Mar 2027 to 19 May 2027 | £375 |
| 3 to 6 months late | 20 May 2027 to 19 Aug 2027 | £750 |
| More than 6 months late | From 20 Aug 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2027 | £200 |
| 3 months late | 31 Aug 2027 | another £200 |
| 6 months late | 30 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 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
- 16456701
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 19 May 2025 (1 year ago)
- Registered office
- 124 City Road, London, EC1V 2NX
- Nature of business
- Construction of railways and underground railways (SIC 42120)
- Year end
- 31 May (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 10 July 2026
Filing notes for civil engineering contractors
Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.
Similar companies in London
Other active civil engineering contractors registered in London.
- Ctori Construction Consultants Limited2008
- Ctori Holdings Limited2003
- Culham Renewables Ltd2013
- Current Energy Group Limited2023
- Currie Power Ltd2019
- Customer Connections Consultants Ltd2025
- Cyber Network Solutions Ltd2025
- Cyiops Ltd2019
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Ctlo Ltd's accounts due?
Ctlo Ltd's next accounts are due at Companies House by 19 February 2027 (in 130 days), covering the period to 31 May 2026.
When is Ctlo 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 18 May 2026, due by 18 May 2027, and one for the period to 31 May 2026, due by 31 May 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Ctlo Ltd still trading?
Ctlo 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 Ctlo Ltd do?
Ctlo Ltd is registered under Construction of railways and underground railways (SIC 42120).
How old is Ctlo Ltd?
Ctlo Ltd was incorporated on 19 May 2025, 1 year ago.
What is the penalty if Ctlo 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 Ctlo 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.