- Companies
- Electricians
- Harpenden
- Sustenergia Ltd
Sustenergia Ltd
- Company number
- 16754603
- Incorporated
- 1 Oct 20251 year trading
- Registered office
- 14 Southdown House, Southdown Road, Harpenden, AL5 1QU
- Nature of business
- Electrical installation; Engineering related scientific and technical consulting activities; Environmental consulting activities
Sustenergia Ltd is a 1-year-old private limited company registered in Harpenden, company number 16754603, one of 22 electrical contractors in Harpenden. Its next accounts are due at Companies House on 1 July 2027, and its first CT600 is due at HMRC on 30 September 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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Who runs and owns Sustenergia Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (2)
| Name | Role | Appointed |
|---|---|---|
| C*** I*** | Director | Oct 2025 |
| Nnedi Ltd | Director (company) | Oct 2025 |
Person with significant control
Where Sustenergia Ltd is registered
The registered office is in Harpenden (AL5), in the St Albans local authority area, East of England. Show AL5 1QU on a map.
Other trade companies in AL5
- M&T Building Services LimitedBuilders
- Rolfe Groundworks LtdGroundworks and demolition
- Rolls and Sons LtdProperty developers
- WM Holdings Group LtdProperty developers
- A Hussain Motor Group LtdMotor traders
- Harpenden Window Cleaning LtdCleaning companies
- Honey Bear Energy LimitedPlumbers and heating engineers
- M&D Paving LtdCivil engineering
What happens if Sustenergia 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 1 July 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 2 Jul 2027 to 1 Aug 2027 | £150 |
| 1 to 3 months late | 2 Aug 2027 to 1 Oct 2027 | £375 |
| 3 to 6 months late | 2 Oct 2027 to 1 Jan 2028 | £750 |
| More than 6 months late | From 2 Jan 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Nov 2027 | £200 |
| 3 months late | 31 Jan 2028 | another £200 |
| 6 months late | 30 Apr 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Oct 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
- 16754603
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 1 October 2025 (1 year ago)
- Registered office
- 14 Southdown House, Southdown Road, Harpenden, AL5 1QU
- Nature of business
- Electrical installation (SIC 43210)
Engineering related scientific and technical consulting activities (SIC 71122)
Environmental consulting activities (SIC 74901) - Year end
- 31 October (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for electrical contractors
Electrical contracting companies are often a director plus a van and tools. Most fall within the micro-entity rules, so the accounts filed at Companies House are short, and the CT600 carries the tax detail.
Similar companies in Harpenden
Other active electrical contractors registered in Harpenden.
- Verulam Electrical Ltd2026
- Wrens Electrical Limited2000
- Agl Construction Services Ltd2015
- Always Off-Peak Limited2025
- Ardent Electrical & Facilities Ltd2021
- Av-Zone Limited2003
- Bailey's Electrical Company Ltd2020
- Ces Electrical Ltd2008
All electrical contractors in Harpenden · All trades in Harpenden · Electricians across the UK
Frequently asked questions
When are Sustenergia Ltd's accounts due?
Sustenergia Ltd's next accounts are due at Companies House by 1 July 2027 (in 261 days), covering the period to 31 October 2026.
When is Sustenergia 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 30 September 2026, due by 30 September 2027, and one for the period to 31 October 2026, due by 31 October 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Sustenergia Ltd still trading?
Sustenergia 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 Sustenergia Ltd do?
Sustenergia Ltd is registered under Electrical installation (SIC 43210); Engineering related scientific and technical consulting activities (SIC 71122); Environmental consulting activities (SIC 74901).
How old is Sustenergia Ltd?
Sustenergia Ltd was incorporated on 1 October 2025, 1 year ago.
Who runs Sustenergia Ltd?
Sustenergia Ltd has 2 active directors, the longest-serving appointed in Oct 2025. Their names and service addresses are on the Companies House register.
Who owns Sustenergia Ltd?
One person or company has significant control of Sustenergia Ltd: an individual (owns 50% to 75% of the shares).
What is the penalty if Sustenergia 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 Sustenergia 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.