- Companies
- Machinery repair and installation
- London
- Semco Online Ltd
Semco Online Ltd
- Company number
- 13697443
- Incorporated
- 22 Oct 20214 years trading
- Registered office
- 20-22 Wenlock Road, London, N1 7GU
- Nature of business
- Repair and maintenance of ships and boats; Wholesale of chemical products
Semco Online Ltd is a 4-year-old private limited company registered in London, company number 13697443, one of 1,743 machinery repair and installation companies in London. Its next accounts are due at Companies House on 30 September 2027, and the CT600 for the period to 31 December 2026 is due at HMRC on 31 December 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 £825 (-16.1%) on the year before, to -£5,944.
- Net assets rose in 1 of 3 year-on-year comparisons on record.
- Current assets of £14K against £12K owed within a year: 1.2 times cover.
- 1 employee on average, down from 2 the year before.
- 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 Dec 2025 | -£5,944 | £14K | £14K | £12K | 1 |
| 31 Oct 2024 | -£5,119 | £678 | £3,219 | 2 | |
| 31 Oct 2023 | -£406 | £24K | £29K | £19K | 2 |
| 31 Oct 2022 | -£741 | £4,180 | £4,921 | 2 |
Where Semco Online Ltd is registered
The registered office is in London (N1), in the Hackney local authority area, London. Show N1 7GU on a map.
Other trade companies in N1
- Tagwise LtdSpecialist contractors
- Sphere Aviation Solutions UK LtdMachinery repair and installation
- Get IT Done Builders LtdJoiners and carpenters
- Evolution Products LimitedMotor traders
- Fleetstone Trading LtdMotor traders
- Kenneth Brady LtdElectricians
- UK Import Export LtdBuilders
- Magic Door Services LimitedMachinery repair and installation
Shared registered office
804 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 Semco Online 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 30 September 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Oct 2027 to 31 Oct 2027 | £150 |
| 1 to 3 months late | 1 Nov 2027 to 31 Dec 2027 | £375 |
| 3 to 6 months late | 1 Jan 2028 to 31 Mar 2028 | £750 |
| More than 6 months late | From 1 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2028 | £200 |
| 3 months late | 31 Mar 2028 | another £200 |
| 6 months late | 30 Jun 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 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
- 13697443
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 22 October 2021 (4 years ago)
- Registered office
- 20-22 Wenlock Road, London, N1 7GU
- Nature of business
- Repair and maintenance of ships and boats (SIC 33150)
Wholesale of chemical products (SIC 46750) - Year end
- 31 December (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 December 2025
- Last confirmation statement
- 21 October 2025
Filing notes for machinery repair and installation companies
Machinery repair and installation companies often carry parts stock and specialist tools, and many work on contracts that span the year end.
Similar companies in London
Other active machinery repair and installation companies registered in London.
- Sendean Cameras Limited2012
- Sensor Technology Systems Limited2004
- Sensordigitworld Ltd2024
- Serg Mech Ltd2026
- Service & Maintenance Warranty Ltd2023
- Service Or Support Ltd2025
- SGH Refractories Ltd2026
- SH Audio Limited2013
All machinery repair and installation companies in London · All trades in London · Machinery repair and installation across the UK
Frequently asked questions
When are Semco Online Ltd's accounts due?
Semco Online Ltd's next accounts are due at Companies House by 30 September 2027 (in 352 days), covering the period to 31 December 2026.
When is Semco Online Ltd's CT600 due?
The CT600 for the period to 31 December 2026 is due at HMRC by 31 December 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 October 2027.
Is Semco Online Ltd still trading?
Semco Online 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 Semco Online Ltd do?
Semco Online Ltd is registered under Repair and maintenance of ships and boats (SIC 33150); Wholesale of chemical products (SIC 46750).
How old is Semco Online Ltd?
Semco Online Ltd was incorporated on 22 October 2021, 4 years ago.
What is the penalty if Semco Online 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 Semco Online 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.