- Companies
- Civil engineering
- London
- Promergon UK Ltd
Promergon UK Ltd
- Company number
- 16380989
- Incorporated
- 11 Apr 20251 year trading
- Registered office
- Lynton House, 7-12 Tavistock Square, London, WC1H 9BQ
- Nature of business
- Construction of utility projects for electricity and telecommunications; Construction of other civil engineering projects n.e.c.; Electrical installation; Other engineering activities
Promergon UK Ltd is a 1-year-old private limited company registered in London, company number 16380989, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 11 January 2027, and its first CT600 is due at HMRC on 10 April 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.
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Where Promergon UK Ltd is registered
The registered office is in London (WC1H), in the Camden local authority area, London. Show WC1H 9BQ on a map.
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Shared registered office
73 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 Promergon UK 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 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 12 Jan 2027 to 11 Feb 2027 | £150 |
| 1 to 3 months late | 12 Feb 2027 to 11 Apr 2027 | £375 |
| 3 to 6 months late | 12 Apr 2027 to 11 Jul 2027 | £750 |
| More than 6 months late | From 12 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 May 2027 | £200 |
| 3 months late | 30 Jul 2027 | another £200 |
| 6 months late | 30 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Apr 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
- 16380989
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 11 April 2025 (1 year ago)
- Registered office
- Lynton House, 7-12 Tavistock Square, London, WC1H 9BQ
- Nature of business
- Construction of utility projects for electricity and telecommunications (SIC 42220)
Construction of other civil engineering projects n.e.c. (SIC 42990)
Electrical installation (SIC 43210)
Other engineering activities (SIC 71129) - Year end
- 30 April (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 9 October 2025
- Previous names
- Promergon Limited (until 23 Apr 2025)
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.
- Promet Technology Limited1988
- Protechnique for Multi Projects Limited2003
- PRW Rail Ltd2024
- PST International Ltd2025
- PT Planners Limited2009
- Pu Drainage 247 Ltd2023
- Pure Build Ltd2026
- Purple Connects Limited2023
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Promergon UK Ltd's accounts due?
Promergon UK Ltd's next accounts are due at Companies House by 11 January 2027 (in 90 days), covering the period to 30 April 2026.
When is Promergon UK 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 April 2026, due by 10 April 2027, and one for the period to 30 April 2026, due by 30 April 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Promergon UK Ltd still trading?
Promergon UK 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 Promergon UK Ltd do?
Promergon UK Ltd is registered under Construction of utility projects for electricity and telecommunications (SIC 42220); Construction of other civil engineering projects n.e.c. (SIC 42990); Electrical installation (SIC 43210); Other engineering activities (SIC 71129).
How old is Promergon UK Ltd?
Promergon UK Ltd was incorporated on 11 April 2025, 1 year ago.
What is the penalty if Promergon UK 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 Promergon UK 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.