- Companies
- Civil engineering
- Royston
- Trienergi Ltd
Trienergi Ltd
- Company number
- 16325332
- Incorporated
- 18 Mar 20251 year trading
- Registered office
- Lake House, Market Hill, Royston, Hertfordshire, SG8 9JN
- Nature of business
- Construction of utility projects for electricity and telecommunications
Trienergi Ltd is a 1-year-old private limited company registered in Royston, company number 16325332, one of 7 civil engineering contractors in Royston. Its next accounts are due at Companies House on 18 December 2026, and its first CT600 is due at HMRC on 17 March 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 Trienergi Ltd is registered
The registered office is in Royston (SG8), in the North Hertfordshire local authority area, East of England. Show SG8 9JN on a map.
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Shared registered office
38 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 Trienergi 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 18 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 19 Dec 2026 to 18 Jan 2027 | £150 |
| 1 to 3 months late | 19 Jan 2027 to 18 Mar 2027 | £375 |
| 3 to 6 months late | 19 Mar 2027 to 18 Jun 2027 | £750 |
| More than 6 months late | From 19 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 16325332
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 18 March 2025 (1 year ago)
- Registered office
- Lake House, Market Hill, Royston, Hertfordshire, SG8 9JN
- Nature of business
- Construction of utility projects for electricity and telecommunications (SIC 42220)
- Year end
- 31 March (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 16 March 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 Royston
Other active civil engineering contractors registered in Royston.
- A & T Property Management Limited2003
- BP Consultant Limited2023
- John Cobb & Sons Limited1971
- North Herts Surfacing Limited1989
- RJ Sol-Comm Solutions Ltd2025
- Toucan 2 Limited2002
All civil engineering contractors in Royston · All trades in Royston · Civil engineering across the UK
Frequently asked questions
When are Trienergi Ltd's accounts due?
Trienergi Ltd's next accounts are due at Companies House by 18 December 2026 (in 66 days), covering the period to 31 March 2026.
When is Trienergi 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 17 March 2026, due by 17 March 2027, and one for the period to 31 March 2026, due by 31 March 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Trienergi Ltd still trading?
Trienergi 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 Trienergi Ltd do?
Trienergi Ltd is registered under Construction of utility projects for electricity and telecommunications (SIC 42220).
How old is Trienergi Ltd?
Trienergi Ltd was incorporated on 18 March 2025, 1 year ago.
What is the penalty if Trienergi 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 Trienergi 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.