- Companies
- Electricians
- London
- Cable Synergy Ltd
Cable Synergy Ltd
- Company number
- 08389454
- Incorporated
- 5 Feb 201313 years trading
- Registered office
- Fergusson House, 124 City Road, London, EC1V 2NX
- Nature of business
- Electrical installation; Other telecommunications activities
Cable Synergy Ltd is a 13-year-old private limited company registered in London, company number 08389454, one of 3,448 electrical contractors in London. Its next accounts are due at Companies House on 30 November 2026, and the CT600 for the period to 28 February 2026 is due at HMRC on 28 February 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 unchanged on the year before, at £0.
- Net assets rose in 0 of 9 year-on-year comparisons on record.
- 1 employee on average during the year.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 28 Feb 2025 | £0 | £0 | £0 | 1 | |
| 28 Feb 2024 | £0 | £0 | £0 | 1 | |
| 21 Feb 2023 | £0 | £0 | £0 | 1 | |
| 28 Feb 2022 | £0 | £0 | £0 | 1 | |
| 28 Feb 2021 | £0 | £0 | 1 | ||
| 28 Feb 2020 | £1 | £0 | £0 | 1 | |
| 28 Feb 2019 | £1 | £0 | £0 | ||
| 28 Feb 2018 | £1 | £0 | £0 | ||
| 28 Feb 2017 | £481 | £481 | £0 | ||
| 28 Feb 2016 | £501 | £501 | £4,501 | £4,000 |
Where Cable Synergy Ltd is registered
The registered office is in London (EC1V), in the Islington local authority area, London. Show EC1V 2NX on a map.
Other trade companies in EC1V
- Cardiff Electrical Solutions LtdElectricians
- Edemis Construction LtdBuilders
- Zaylan LtdProperty developers
- Pronto Roofing and Construction LtdRoofers
- Instal Systems LtdPlumbers and heating engineers
- J&R Partners LtdBuilders
- The Tile Craft LtdFinishing trades
- Cathal Od Solutions LtdSpecialist contractors
Also registered at this address
1 other company uses the same registered office as Cable Synergy Ltd.
- Red Sword Security LtdElectricians
What happens if Cable Synergy 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 November 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Dec 2026 to 31 Dec 2026 | £150 |
| 1 to 3 months late | 1 Jan 2027 to 28 Feb 2027 | £375 |
| 3 to 6 months late | 1 Mar 2027 to 31 May 2027 | £750 |
| More than 6 months late | From 1 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Mar 2027 | £200 |
| 3 months late | 28 May 2027 | another £200 |
| 6 months late | 28 Aug 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 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
- 08389454
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 5 February 2013 (13 years ago)
- Registered office
- Fergusson House, 124 City Road, London, EC1V 2NX
- Nature of business
- Electrical installation (SIC 43210)
Other telecommunications activities (SIC 61900) - Year end
- 28 February (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 28 February 2025
- Last confirmation statement
- 5 February 2026
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 London
Other active electrical contractors registered in London.
- Cable Web Ltd2025
- Caleb&Tyler Services Ltd2020
- Callfix Services Ltd2026
- Cama Networks Projects Ltd2020
- Campbell Electrical Solutions Ltd2021
- Cando-Property Ltd2019
- Cani Logistics Ltd2025
- Cannon Cable Ltd2014
All electrical contractors in London · All trades in London · Electricians across the UK
Frequently asked questions
When are Cable Synergy Ltd's accounts due?
Cable Synergy Ltd's next accounts are due at Companies House by 30 November 2026 (in 48 days), covering the period to 28 February 2026.
When is Cable Synergy Ltd's CT600 due?
The CT600 for the period to 28 February 2026 is due at HMRC by 28 February 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 December 2026.
Is Cable Synergy Ltd still trading?
Cable Synergy 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 Cable Synergy Ltd do?
Cable Synergy Ltd is registered under Electrical installation (SIC 43210); Other telecommunications activities (SIC 61900).
How old is Cable Synergy Ltd?
Cable Synergy Ltd was incorporated on 5 February 2013, 13 years ago.
What is the penalty if Cable Synergy 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 Cable Synergy 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.