- Companies
- Civil engineering
- London
- Flexion Energy UK Storage Ltd
Flexion Energy UK Storage Ltd
- Company number
- 13492210
- Incorporated
- 5 Jul 20215 years trading
- Registered office
- 27 Old Gloucester Street, London, WC1N 3AX
- Nature of business
- Construction of utility projects for electricity and telecommunications
Flexion Energy UK Storage Ltd is a 5-year-old private limited company registered in London, company number 13492210, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 31 December 2026, and its first CT600 is due at HMRC on 31 December 2026.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
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 down £745K (-19.7%) on the year before, to £3M.
- Current assets of £4M against £1M owed within a year: 4.0 times cover.
- 1 employee on average, up from 0 the year before.
- Balance sheets on record for 3 years, 2022 to 2024.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2024 | £3M | £18K | £4M | £1M | 1 |
| 31 Dec 2023 | £3.8M | £1.1M | £4.5M | £754K | 0 |
| 31 Dec 2022 | £2.2M | £737K | £1.5M | £115K | 0 |
Where Flexion Energy UK Storage Ltd is registered
The registered office is in London (WC1N), in the Camden local authority area, London. Show WC1N 3AX on a map.
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Shared registered office
554 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 Flexion Energy UK Storage 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 31 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 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
- 13492210
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 5 July 2021 (5 years ago)
- Registered office
- 27 Old Gloucester Street, London, WC1N 3AX
- Nature of business
- Construction of utility projects for electricity and telecommunications (SIC 42220)
- Year end
- 31 December (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 December 2024
- Last confirmation statement
- 4 July 2026
- Charges (mortgages)
- 3 outstanding of 3 registered
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.
- Floatarm Trading Limited2001
- Flynn Rail Services Ltd2026
- FN Construction Limited2015
- Focusview Limited1998
- Foladbros Limited2017
- Foosh Engineering Ltd2024
- Foras Group Ltd2018
- Fordgate Hydro Limited2023
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Flexion Energy UK Storage Ltd's accounts due?
Flexion Energy UK Storage Ltd's next accounts are due at Companies House by 31 December 2026 (in 78 days), covering the period to 31 March 2026.
When is Flexion Energy UK Storage 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 31 December 2025, due by 31 December 2026, 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 Flexion Energy UK Storage Ltd still trading?
Flexion Energy UK Storage 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 Flexion Energy UK Storage Ltd do?
Flexion Energy UK Storage Ltd is registered under Construction of utility projects for electricity and telecommunications (SIC 42220).
How old is Flexion Energy UK Storage Ltd?
Flexion Energy UK Storage Ltd was incorporated on 5 July 2021, 5 years ago.
What is the penalty if Flexion Energy UK Storage 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 Flexion Energy UK Storage 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.