- Companies
- Specialist contractors
- Llanelli
- Csi Llanelli Limited
Csi Llanelli Limited
- Company number
- 06891559
- Incorporated
- 29 Apr 200917 years trading
- Registered office
- C/O Charles & Co, 3 Murray Street, Llanelli, Carmarthenshire, SA15 1AQ
- Nature of business
- Other specialised construction activities n.e.c.
Csi Llanelli Limited is a 17-year-old private limited company registered in Llanelli, company number 06891559, one of 16 specialist construction companies in Llanelli. Its next accounts are due at Companies House on 31 January 2028, and the CT600 for the period to 30 April 2027 is due at HMRC on 30 April 2028.
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 £27K (-18.9%) on the year before, to £118K.
- Net assets rose in 6 of 9 year-on-year comparisons on record.
- Current assets of £87K against £3,603 owed within a year: more than 10 times cover.
- 9 employees on average during the year.
- Balance sheets on record for 10 years, 2017 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Apr 2026 | £118K | £85K | £87K | £3,603 | 9 |
| 30 Apr 2025 | £145K | £123K | £125K | £6,474 | 9 |
| 30 Apr 2024 | £139K | £112K | £114K | £4,377 | 9 |
| 30 Apr 2023 | £172K | £143K | £146K | £8,959 | 9 |
| 30 Apr 2022 | £219K | £195K | £203K | £33K | 9 |
| 30 Apr 2021 | £185K | £232K | £233K | £44K | 10 |
| 30 Apr 2020 | £162K | £137K | £164K | £43K | 8 |
| 30 Apr 2019 | £135K | £127K | £128K | £46K | 8 |
| 30 Apr 2018 | £116K | £135K | £57K | 8 | |
| 30 Apr 2017 | £101K | £99K | £45K |
Where Csi Llanelli Limited is registered
The registered office is in Llanelli (SA15), in the Carmarthenshire local authority area, Wales. Show SA15 1AQ on a map.
Other trade companies in SA15
- Annesley Street (Llanelli) LtdProperty developers
- A&J Landscapes and Property Maintenance LimitedLandscapers and gardeners
- A.C Electrics Llanelli LtdElectricians
- Blue Lagoon Paving & Patios LtdLandscapers and gardeners
- Gwyn Towns Installations LtdInstallers
- Ozma Developments LtdProperty developers
- Swansea Mobile Boat Engineers LtdMachinery repair and installation
- South Wales Bathrooms and Heating LtdPlumbers and heating engineers
Also registered at this address
2 other companies use the same registered office as Csi Llanelli Limited.
- 3 M'S Timberframe & Carpentry LimitedCivil engineering
- Lewis Construction Building Contractors Wales LtdCivil engineering
What happens if Csi Llanelli Limited 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 January 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Feb 2028 to 29 Feb 2028 | £150 |
| 1 to 3 months late | 1 Mar 2028 to 30 Apr 2028 | £375 |
| 3 to 6 months late | 1 May 2028 to 31 Jul 2028 | £750 |
| More than 6 months late | From 1 Aug 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 May 2028 | £200 |
| 3 months late | 30 Jul 2028 | another £200 |
| 6 months late | 30 Oct 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Apr 2029 | 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
- 06891559
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 29 April 2009 (17 years ago)
- Registered office
- C/O Charles & Co, 3 Murray Street, Llanelli, Carmarthenshire, SA15 1AQ
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 30 April (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 April 2026
- Last confirmation statement
- 29 April 2026
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Llanelli
Other active specialist construction companies registered in Llanelli.
- De Lewis Engineering Ltd2016
- DJ UPVC UK Ltd2013
- Expa Limited2004
- Just Lime Limited2014
- L. Weston Construction Ltd2025
- Project Crane Services Ltd2024
- RJ Labour Services Ltd2025
- SSN Property & Housing Ltd2025
All specialist construction companies in Llanelli · All trades in Llanelli · Specialist contractors across the UK
Frequently asked questions
When are Csi Llanelli Limited's accounts due?
Csi Llanelli Limited's next accounts are due at Companies House by 31 January 2028 (in 476 days), covering the period to 30 April 2027.
When is Csi Llanelli Limited's CT600 due?
The CT600 for the period to 30 April 2027 is due at HMRC by 30 April 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 February 2028.
Is Csi Llanelli Limited still trading?
Csi Llanelli Limited 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 Csi Llanelli Limited do?
Csi Llanelli Limited is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Csi Llanelli Limited?
Csi Llanelli Limited was incorporated on 29 April 2009, 17 years ago.
What is the penalty if Csi Llanelli Limited 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 Csi Llanelli Limited 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.