- Companies
- Specialist contractors
- London
- CSLM Con Ltd
CSLM Con Ltd
- Company number
- 13406247
- Incorporated
- 18 May 20215 years trading
- Registered office
- 81 Enterprize Way, London, SE8 3RD
- Nature of business
- Other specialised construction activities n.e.c.
CSLM Con Ltd is a 5-year-old private limited company registered in London, company number 13406247, one of 4,318 specialist construction companies in London. Its next accounts are due at Companies House on 28 February 2027, and the CT600 for the period to 31 May 2026 is due at HMRC on 31 May 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 £159 (-67.7%) on the year before, to £76.
- Net assets rose in 0 of 3 year-on-year comparisons on record.
- Current assets of £42K against £43K owed within a year: 1.0 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 4 years, 2022 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 May 2025 | £76 | £13K | £42K | £43K | 2 |
| 31 May 2024 | £235 | £16K | £42K | £42K | 2 |
| 31 May 2023 | £2,538 | £7,421 | £32K | £30K | 2 |
| 31 May 2022 | £8,854 | £5,419 | £18K | £9,742 | 2 |
Where CSLM Con Ltd is registered
The registered office is in London (SE8), in the Lewisham local authority area, London. Show SE8 3RD on a map.
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What happens if CSLM Con 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 28 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Mar 2027 to 31 Mar 2027 | £150 |
| 1 to 3 months late | 1 Apr 2027 to 31 May 2027 | £375 |
| 3 to 6 months late | 1 Jun 2027 to 31 Aug 2027 | £750 |
| More than 6 months late | From 1 Sep 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2027 | £200 |
| 3 months late | 31 Aug 2027 | another £200 |
| 6 months late | 30 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 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
- 13406247
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 18 May 2021 (5 years ago)
- Registered office
- 81 Enterprize Way, London, SE8 3RD
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 May (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 17 May 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 London
Other active specialist construction companies registered in London.
- CT11953739 Limited2019
- Ctadri Ltd2024
- Ctrade Construct Ltd2019
- Cu Builder Ltd2024
- Cube Retail Project Management Limited2018
- Cupcake Construction Ltd2021
- Cupet Engineers Ltd2016
- Cuprum Wing Ltd2025
All specialist construction companies in London · All trades in London · Specialist contractors across the UK
Frequently asked questions
When are CSLM Con Ltd's accounts due?
CSLM Con Ltd's next accounts are due at Companies House by 28 February 2027 (in 139 days), covering the period to 31 May 2026.
When is CSLM Con Ltd's CT600 due?
The CT600 for the period to 31 May 2026 is due at HMRC by 31 May 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 March 2027.
Is CSLM Con Ltd still trading?
CSLM Con 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 CSLM Con Ltd do?
CSLM Con Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is CSLM Con Ltd?
CSLM Con Ltd was incorporated on 18 May 2021, 5 years ago.
What is the penalty if CSLM Con 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 CSLM Con 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.