- Companies
- Civil engineering
- London
- Cellex Ltd
Cellex Ltd
- Company number
- 13289083
- Incorporated
- 24 Mar 20215 years trading
- Registered office
- 71-75 Shelton Street, London, Greater London, WC2H 9JQ
- Nature of business
- Construction of utility projects for electricity and telecommunications
Cellex Ltd is a 5-year-old private limited company registered in London, company number 13289083, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 29 April 2027, and the CT600 for the period to 29 July 2026 is due at HMRC on 29 July 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 £2.7M (+86.8%) on the year before, to £5.7M.
- Net assets rose in 4 of 4 year-on-year comparisons on record.
- Current assets of £7.5M against £1.8M owed within a year: 4.1 times cover.
- 21 employees on average, up from 16 the year before.
- Balance sheets on record for 5 years, 2021 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jul 2025 | £5.7M | £6.4M | £7.5M | £1.8M | 21 |
| 31 Jul 2024 | £3.1M | £3.7M | £4.9M | £2M | 16 |
| 31 Jul 2023 | £963K | £1M | £1.9M | £1M | 12 |
| 31 Jul 2022 | £139K | £57K | £248K | £124K | 10 |
| 31 Jul 2021 | £10K | £10K | 1 |
Where Cellex Ltd is registered
The registered office is in London (WC2H), in the Camden local authority area, London. Show WC2H 9JQ on a map.
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Shared registered office
4,529 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 Cellex 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 29 April 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 30 Apr 2027 to 29 May 2027 | £150 |
| 1 to 3 months late | 30 May 2027 to 29 Jul 2027 | £375 |
| 3 to 6 months late | 30 Jul 2027 to 29 Oct 2027 | £750 |
| More than 6 months late | From 30 Oct 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 30 Jul 2027 | £200 |
| 3 months late | 29 Oct 2027 | another £200 |
| 6 months late | 29 Jan 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 29 Jul 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
- 13289083
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 24 March 2021 (5 years ago)
- Registered office
- 71-75 Shelton Street, London, Greater London, WC2H 9JQ
- Nature of business
- Construction of utility projects for electricity and telecommunications (SIC 42220)
- Year end
- 29 July (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 July 2025
- Last confirmation statement
- 23 March 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.
- Ceno Property Services Ltd2024
- CF Dulhac Ltd2020
- CH6 Management Ltd2026
- Chase Utility Services Ltd2021
- Chatham Maritime Group Ltd2026
- Chelsea Builders Limited2022
- Chendhuran Limited2018
- Chimek Ltd2017
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Cellex Ltd's accounts due?
Cellex Ltd's next accounts are due at Companies House by 29 April 2027 (in 199 days), covering the period to 29 July 2026.
When is Cellex Ltd's CT600 due?
The CT600 for the period to 29 July 2026 is due at HMRC by 29 July 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 30 April 2027.
Is Cellex Ltd still trading?
Cellex 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 Cellex Ltd do?
Cellex Ltd is registered under Construction of utility projects for electricity and telecommunications (SIC 42220).
How old is Cellex Ltd?
Cellex Ltd was incorporated on 24 March 2021, 5 years ago.
What is the penalty if Cellex 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 Cellex 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.