- Companies
- Civil engineering
- London
- Lysoj Limited
Lysoj Limited
- Company number
- 12250683
- Incorporated
- 8 Oct 20197 years trading
- Registered office
- 27 Old Gloucester Street, London, WC1N 3AX
- Nature of business
- Construction of water projects
Lysoj Limited is a 7-year-old private limited company registered in London, company number 12250683, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 31 July 2027, and the CT600 for the period to 31 October 2026 is due at HMRC on 31 October 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 £621 (+155.3%) on the year before, to £1,021.
- Net assets rose in 2 of 5 year-on-year comparisons on record.
- Current assets of £76K against £59K owed within a year: 1.3 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Oct 2025 | £1,021 | £76K | £59K | 1 | |
| 31 Oct 2024 | £400 | £76K | £29K | 1 | |
| 31 Oct 2023 | £1,057 | £63K | £18K | 1 | |
| 31 Oct 2022 | £1,697 | £56K | 1 | ||
| 31 Oct 2021 | £1,527 | £22K | £64K | £26K | 1 |
| 31 Oct 2020 | £1,528 | £36K | £67K | £15K | 1 |
Where Lysoj Limited is registered
The registered office is in London (WC1N), in the Camden local authority area, London. Show WC1N 3AX on a map.
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Shared registered office
554 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if Lysoj 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 July 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Aug 2027 to 31 Aug 2027 | £150 |
| 1 to 3 months late | 1 Sep 2027 to 31 Oct 2027 | £375 |
| 3 to 6 months late | 1 Nov 2027 to 31 Jan 2028 | £750 |
| More than 6 months late | From 1 Feb 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Nov 2027 | £200 |
| 3 months late | 31 Jan 2028 | another £200 |
| 6 months late | 30 Apr 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Oct 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
- 12250683
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 October 2019 (7 years ago)
- Registered office
- 27 Old Gloucester Street, London, WC1N 3AX
- Nature of business
- Construction of water projects (SIC 42910)
- Year end
- 31 October (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 October 2025
- Last confirmation statement
- 30 January 2026
Filing notes for civil engineering contractors
Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.
Similar companies in London
Other active civil engineering contractors registered in London.
- Lyvion2025 Ltd2025
- M A Redhead Limited2018
- M V M Contractors Limited2000
- M&Associates Ltd2020
- M. Conneely Engineering Services Ltd2000
- M.J. Hernon Engineering Surveys Limited2014
- Maahircabling Ltd2025
- Mabani Limited2022
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Lysoj Limited's accounts due?
Lysoj Limited's next accounts are due at Companies House by 31 July 2027 (in 292 days), covering the period to 31 October 2026.
When is Lysoj Limited's CT600 due?
The CT600 for the period to 31 October 2026 is due at HMRC by 31 October 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 August 2027.
Is Lysoj Limited still trading?
Lysoj 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 Lysoj Limited do?
Lysoj Limited is registered under Construction of water projects (SIC 42910).
How old is Lysoj Limited?
Lysoj Limited was incorporated on 8 October 2019, 7 years ago.
What is the penalty if Lysoj 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 Lysoj 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.