- Companies
- Electricians
- Southampton
- CSL Engineers Ltd
CSL Engineers Ltd
- Company number
- 07782640
- Incorporated
- 21 Sep 201115 years trading
- Registered office
- 3 Hawkers Close, Totton, Southampton, SO40 3GG
- Nature of business
- Electrical installation
CSL Engineers Ltd is a 15-year-old private limited company registered in Southampton, company number 07782640, one of 342 electrical contractors in Southampton. Its next accounts are due at Companies House on 30 June 2027, and the CT600 for the period to 30 September 2026 is due at HMRC on 30 September 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 up £10K (+865.8%) on the year before, to £11K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £35K against £28K owed within a year: 1.3 times cover.
- 1 employee on average, down from 2 the year before.
- 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 |
|---|---|---|---|---|---|
| 30 Sep 2025 | £11K | £24K | £35K | £28K | 1 |
| 30 Sep 2024 | £1,181 | £28K | £42K | £40K | 2 |
| 30 Sep 2023 | £2,723 | £24K | £12K | 1 | |
| 30 Sep 2022 | £2,723 | £16K | 2 | ||
| 30 Sep 2021 | £2,722 | £21K | £0 | 2 | |
| 30 Sep 2020 | £2,701 | £28K | £6,849 | 2 | |
| 30 Sep 2019 | £2,700 | £3,531 | £1,021 | 2 | |
| 30 Sep 2018 | £2,700 | £5,426 | £2,979 | ||
| 30 Sep 2017 | £17K | £30K | £14K | ||
| 30 Sep 2016 | £26 | £33K | £33K | £33K |
Where CSL Engineers Ltd is registered
The registered office is in Southampton (SO40), in the New Forest local authority area, South East. Show SO40 3GG on a map.
Other trade companies in SO40
- DW Exterior Cleaning LtdCleaning companies
- Eco Clean New Forest LtdCleaning companies
- Refine Property & Marine Services LtdCleaning companies
- Evergleam Cleaning Solutions LtdCleaning companies
- JMD Building Services LimitedBuilders
- South Coast Landscape and Groundworks LtdBuilders
- A.W. Berry Developments LtdSpecialist contractors
- MLK Services LimitedSpecialist contractors
What happens if CSL Engineers 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 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jul 2027 to 31 Jul 2027 | £150 |
| 1 to 3 months late | 1 Aug 2027 to 30 Sep 2027 | £375 |
| 3 to 6 months late | 1 Oct 2027 to 31 Dec 2027 | £750 |
| More than 6 months late | From 1 Jan 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2027 | £200 |
| 3 months late | 30 Dec 2027 | another £200 |
| 6 months late | 30 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 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
- 07782640
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 21 September 2011 (15 years ago)
- Registered office
- 3 Hawkers Close, Totton, Southampton, SO40 3GG
- Nature of business
- Electrical installation (SIC 43210)
- Year end
- 30 September (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 23 January 2026
- Previous names
- CSL Technicians Ltd (until 4 Mar 2020)
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 Southampton
Other active electrical contractors registered in Southampton.
- CWP Electrical Ltd2021
- D L Taylor Limited2002
- Datatech Ltd1998
- Dayglow Lighting Ltd2018
- Dbe Contracting Ltd2020
- DBV Concept Ltd2023
- Derek Young Electrical Limited2018
- Divine Insight Global Limited2026
All electrical contractors in Southampton · All trades in Southampton · Electricians across the UK
Frequently asked questions
When are CSL Engineers Ltd's accounts due?
CSL Engineers Ltd's next accounts are due at Companies House by 30 June 2027 (in 261 days), covering the period to 30 September 2026.
When is CSL Engineers Ltd's CT600 due?
The CT600 for the period to 30 September 2026 is due at HMRC by 30 September 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 July 2027.
Is CSL Engineers Ltd still trading?
CSL Engineers 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 CSL Engineers Ltd do?
CSL Engineers Ltd is registered under Electrical installation (SIC 43210).
How old is CSL Engineers Ltd?
CSL Engineers Ltd was incorporated on 21 September 2011, 15 years ago.
What is the penalty if CSL Engineers 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 CSL Engineers 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.