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- Harnessedpower Ltd
Company profile · Civil engineering
Harnessedpower Ltd
Harnessedpower Ltd is a 7-year-old private limited company registered in London, company number 11637403, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 29 October 2026, and its first CT600 is due at HMRC on 29 October 2026.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Harnessedpower Ltd over the years
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets up £1,653 (+246%) on the year before, to £981.
- Net assets rose in 1 of 4 year-on-year comparisons on record.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 5 years, 2019 to 2023.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Oct 2023 | £981 | £981 | 0 | ||
| 31 Oct 2022 | -£672 | £28 | £700 | 0 | |
| 31 Oct 2021 | £1,638 | £4,478 | £2,840 | 1 | |
| 31 Oct 2020 | £2,812 | £5,652 | £2,840 | 0 | |
| 31 Oct 2019 | £4,206 | £6,929 | £2,723 |
Where Harnessedpower Ltd is registered
The registered office is in London (E4), in the Waltham Forest local authority area, London. Show E4 8JB on a map.
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What happens if Harnessedpower 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 29 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 30 Oct 2026 to 29 Nov 2026 | £150 |
| 1 to 3 months late | 30 Nov 2026 to 29 Jan 2027 | £375 |
| 3 to 6 months late | 30 Jan 2027 to 29 Apr 2027 | £750 |
| More than 6 months late | From 30 Apr 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 30 Jan 2027 | £200 |
| 3 months late | 29 Apr 2027 | another £200 |
| 6 months late | 29 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 29 Jan 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
- 11637403
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 23 October 2018 (7 years ago)
- Registered office
- 70 Mandeville Court, London, E4 8JB
- Nature of business
- Construction of utility projects for electricity and telecommunications (SIC 42220)
Electrical installation (SIC 43210) - Year end
- 29 October (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 29 October 2024
- Last confirmation statement
- 22 October 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.
- Hastings Consult Ltd2026
- Havilah Good Gold Ltd2015
- Hawthorne Energy Ltd2026
- Hayeswood Comms Ltd2025
- Haytch Ltd2019
- HBBB Ltd2023
- HC Services (South) Ltd2026
- Heatronics Limited2017
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Harnessedpower Ltd's accounts due?
Harnessedpower Ltd's next accounts are due at Companies House by 29 October 2026 (in 17 days), covering the period to 29 January 2026.
When is Harnessedpower 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 29 October 2025, due by 29 October 2026, and one for the period to 29 January 2026, due by 29 January 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Harnessedpower Ltd still trading?
Harnessedpower 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 Harnessedpower Ltd do?
Harnessedpower Ltd is registered under Construction of utility projects for electricity and telecommunications (SIC 42220); Electrical installation (SIC 43210).
How old is Harnessedpower Ltd?
Harnessedpower Ltd was incorporated on 23 October 2018, 7 years ago.
What is the penalty if Harnessedpower 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 Harnessedpower 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.