- Companies
- Specialist contractors
- London
- Selwynco Limited
Selwynco Limited
- Company number
- 12901237
- Incorporated
- 24 Sep 20206 years trading
- Registered office
- Aston House, Cornwall Avenue, London, N3 1LF
- Nature of business
- Other specialised construction activities n.e.c.
Selwynco Limited is a 6-year-old private limited company registered in London, company number 12901237, one of 4,318 specialist construction companies in London. Its next accounts are due at Companies House on 24 December 2026, and the CT600 for the period to 24 March 2026 is due at HMRC on 24 March 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 £3,589 on the year before, to £3,809.
- Net assets rose in 2 of 3 year-on-year comparisons on record.
- Current assets of £41K against £37K owed within a year: 1.1 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- 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 Mar 2025 | £3,809 | £1,988 | £41K | £37K | 0 |
| 31 Mar 2024 | £220 | £3,840 | £39K | £39K | 1 |
| 31 Mar 2023 | £100 | £100 | |||
| 24 Mar 2022 | £100 | £100 |
Where Selwynco Limited is registered
The registered office is in London (N3), in the Barnet local authority area, London. Show N3 1LF on a map.
Other trade companies in N3
- Key & Keep LtdCleaning companies
- GMS Residential LimitedPlumbers and heating engineers
- Gcap East LtdProperty developers
- Tatras Development LimitedProperty developers
- Chesterfield Corinne LtdProperty developers
- Pure Plumbing Pros LimitedPlumbers and heating engineers
- WS Cleaning Services LtdCleaning companies
- Landfall Projects LimitedProperty developers
Shared registered office
46 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 Selwynco 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 24 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 25 Dec 2026 to 24 Jan 2027 | £150 |
| 1 to 3 months late | 25 Jan 2027 to 24 Mar 2027 | £375 |
| 3 to 6 months late | 25 Mar 2027 to 24 Jun 2027 | £750 |
| More than 6 months late | From 25 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 25 Mar 2027 | £200 |
| 3 months late | 24 Jun 2027 | another £200 |
| 6 months late | 24 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 24 Mar 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
- 12901237
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 24 September 2020 (6 years ago)
- Registered office
- Aston House, Cornwall Avenue, London, N3 1LF
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 24 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 23 September 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.
- Sergons Ltd2022
- Sermirav Auto Ltd2021
- Serpasgb Ltd.2015
- Sersem Services Ltd2024
- Servdata Ltd2026
- Service Group Energy Ltd2026
- Sevan Multi-Site Solutions Limited2018
- Sevan UK Holdings Limited2020
All specialist construction companies in London · All trades in London · Specialist contractors across the UK
Frequently asked questions
When are Selwynco Limited's accounts due?
Selwynco Limited's next accounts are due at Companies House by 24 December 2026 (in 73 days), covering the period to 24 March 2026.
When is Selwynco Limited's CT600 due?
The CT600 for the period to 24 March 2026 is due at HMRC by 24 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 25 December 2026.
Is Selwynco Limited still trading?
Selwynco Limited is listed as active on the Companies House register (checked 12 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 Selwynco Limited do?
Selwynco Limited is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Selwynco Limited?
Selwynco Limited was incorporated on 24 September 2020, 6 years ago.
What is the penalty if Selwynco 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 Selwynco Limited on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 12 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.