- Companies
- Electricians
- Swanley
- Prolec Engineering (London) Ltd
Prolec Engineering (London) Ltd
- Company number
- 11121661
- Incorporated
- 21 Dec 20178 years trading
- Registered office
- The Old Barn, Wood Street, Swanley, BR8 7PA
- Nature of business
- Electrical installation
Prolec Engineering (London) Ltd is a 8-year-old private limited company registered in Swanley, company number 11121661, one of 50 electrical contractors in Swanley. Its next accounts are due at Companies House on 30 September 2027, and the CT600 for the period to 31 December 2026 is due at HMRC on 31 December 2027.
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 £2,025 (-147.2%) on the year before, to -£649.
- Net assets rose in 3 of 7 year-on-year comparisons on record.
- Current assets of £168 against £3,544 owed within a year: 0.0 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 8 years, 2018 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2025 | -£649 | £168 | £168 | £3,544 | 0 |
| 31 Dec 2024 | £1,376 | £642 | £1,121 | £4,023 | 1 |
| 31 Dec 2023 | £4,185 | £521 | £521 | £1,369 | 0 |
| 31 Dec 2022 | -£490 | £112 | £26K | £4,363 | 0 |
| 31 Dec 2021 | £359 | £74 | £34K | £2,950 | 0 |
| 31 Dec 2020 | £1,944 | £16K | £38K | £4,913 | 1 |
| 31 Dec 2019 | £1,825 | £878 | £21K | £21K | 1 |
| 31 Dec 2018 | -£3,445 | £5,855 | £6,104 | £11K | 1 |
Where Prolec Engineering (London) Ltd is registered
The registered office is in Swanley (BR8), in the Sevenoaks local authority area, South East. Show BR8 7PA on a map.
Other trade companies in BR8
- S.P.M (South East) LtdPlumbers and heating engineers
- Omnidrive Motors LtdMotor traders
- Epx Resins LtdFloor and wall tilers
- SLC Contractors Ltd LtdBuilders
- Build and Beyond CX Consulting LimitedFinishing trades
- Roostanproperty LtdProperty developers
- HL Contract Cleaning Services LtdMechanics and garages
- Fasteasycar LtdMotor traders
Shared registered office
264 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 Prolec Engineering (London) 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 30 September 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Oct 2027 to 31 Oct 2027 | £150 |
| 1 to 3 months late | 1 Nov 2027 to 31 Dec 2027 | £375 |
| 3 to 6 months late | 1 Jan 2028 to 31 Mar 2028 | £750 |
| More than 6 months late | From 1 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2028 | £200 |
| 3 months late | 31 Mar 2028 | another £200 |
| 6 months late | 30 Jun 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 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
- 11121661
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 21 December 2017 (8 years ago)
- Registered office
- The Old Barn, Wood Street, Swanley, BR8 7PA
- Nature of business
- Electrical installation (SIC 43210)
- Year end
- 31 December (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 December 2025
- Last confirmation statement
- 20 December 2025
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 Swanley
Other active electrical contractors registered in Swanley.
- Raffelecs Ltd2020
- Rei Services Group Ltd2021
- Riplex Electrical Solutions Ltd2020
- Roots Electrical Ltd2022
- Sentry Protection Ltd2024
- SFN Electrical Services Ltd2019
- Spectrum Electrical Projects Ltd2019
- Swan Electrical Systems Limited2011
All electrical contractors in Swanley · All trades in Swanley · Electricians across the UK
Frequently asked questions
When are Prolec Engineering (London) Ltd's accounts due?
Prolec Engineering (London) Ltd's next accounts are due at Companies House by 30 September 2027 (in 352 days), covering the period to 31 December 2026.
When is Prolec Engineering (London) Ltd's CT600 due?
The CT600 for the period to 31 December 2026 is due at HMRC by 31 December 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 October 2027.
Is Prolec Engineering (London) Ltd still trading?
Prolec Engineering (London) 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 Prolec Engineering (London) Ltd do?
Prolec Engineering (London) Ltd is registered under Electrical installation (SIC 43210).
How old is Prolec Engineering (London) Ltd?
Prolec Engineering (London) Ltd was incorporated on 21 December 2017, 8 years ago.
What is the penalty if Prolec Engineering (London) 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 Prolec Engineering (London) 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.