- Companies
- Electricians
- Plymouth
- C.S I. (SW) Ltd
C.S I. (SW) Ltd
- Company number
- 08300632
- Incorporated
- 20 Nov 201213 years trading
- Registered office
- 3 Tor Close, Plymouth, PL3 5TH
- Nature of business
- Electrical installation
C.S I. (SW) Ltd is a 13-year-old private limited company registered in Plymouth, company number 08300632, one of 124 electrical contractors in Plymouth. Its next accounts are due at Companies House on 31 August 2027, and the CT600 for the period to 30 November 2026 is due at HMRC on 30 November 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 £21K (-28.8%) on the year before, to £53K.
- Net assets rose in 4 of 9 year-on-year comparisons on record.
- 4 employees on average, up 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 Nov 2025 | £53K | £0 | £115K | 4 | |
| 30 Nov 2024 | £74K | £1,346 | £71K | 2 | |
| 30 Nov 2023 | £96K | £9,179 | £75K | 1 | |
| 30 Nov 2022 | £111K | £209K | £101K | 1 | |
| 30 Nov 2021 | £88K | £179K | £94K | 1 | |
| 30 Nov 2020 | £102K | £226K | £128K | 1 | |
| 30 Nov 2019 | £87K | £161K | £77K | 2 | |
| 30 Nov 2018 | £65K | £148K | £86K | ||
| 30 Nov 2017 | £16K | £49K | £35K | ||
| 30 Nov 2016 | £23K | £6,817 | £73K | £52K |
Where C.S I. (SW) Ltd is registered
The registered office is in Plymouth (PL3), in the Plymouth local authority area, South West. Show PL3 5TH on a map.
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What happens if C.S I. (SW) 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 August 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Sep 2027 to 30 Sep 2027 | £150 |
| 1 to 3 months late | 1 Oct 2027 to 30 Nov 2027 | £375 |
| 3 to 6 months late | 1 Dec 2027 to 29 Feb 2028 | £750 |
| More than 6 months late | From 1 Mar 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Dec 2027 | £200 |
| 3 months late | 29 Feb 2028 | another £200 |
| 6 months late | 30 May 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Nov 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
- 08300632
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 20 November 2012 (13 years ago)
- Registered office
- 3 Tor Close, Plymouth, PL3 5TH
- Nature of business
- Electrical installation (SIC 43210)
- Year end
- 30 November (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 November 2025
- Last confirmation statement
- 10 January 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 Plymouth
Other active electrical contractors registered in Plymouth.
- Care Projects (SW) Ltd2021
- Cee Group Ltd2021
- Chubb Electrics Ltd2008
- Churchill Electrical Limited1998
- Churchward Electrical Solutions Ltd2026
- Citadel Electrical Services Limited2013
- CMC Electrical (SW) Ltd2024
- Coleenergy Ltd.2025
All electrical contractors in Plymouth · All trades in Plymouth · Electricians across the UK
Frequently asked questions
When are C.S I. (SW) Ltd's accounts due?
C.S I. (SW) Ltd's next accounts are due at Companies House by 31 August 2027 (in 322 days), covering the period to 30 November 2026.
When is C.S I. (SW) Ltd's CT600 due?
The CT600 for the period to 30 November 2026 is due at HMRC by 30 November 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 September 2027.
Is C.S I. (SW) Ltd still trading?
C.S I. (SW) 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 C.S I. (SW) Ltd do?
C.S I. (SW) Ltd is registered under Electrical installation (SIC 43210).
How old is C.S I. (SW) Ltd?
C.S I. (SW) Ltd was incorporated on 20 November 2012, 13 years ago.
What is the penalty if C.S I. (SW) 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 C.S I. (SW) 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.