- Companies
- Installers
- London
- Secon Group Ltd
Secon Group Ltd
- Company number
- 13727723
- Incorporated
- 8 Nov 20214 years trading
- Registered office
- Thomas Harris 1929 Shop Merton Abbey Mills, 18 Watermill Way, London, SW19 2RD
- Nature of business
- Other construction installation
Secon Group Ltd is a 4-year-old private limited company registered in London, company number 13727723, one of 2,278 installation companies (insulation, lifts, shutters and similar) in London. Its next accounts are due at Companies House on 31 December 2027, and the CT600 for the period to 31 March 2027 is due at HMRC on 31 March 2028.
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 £21K (-41.8%) on the year before, to £30K.
- Net assets rose in 2 of 3 year-on-year comparisons on record.
- Current assets of £28K against £26K owed within a year: 1.1 times cover.
- 2 employees on average, up from 1 the year before.
- Balance sheets on record for 4 years, 2022 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £30K | £28K | £26K | 2 | |
| 31 Mar 2025 | £51K | £24K | £13K | 1 | |
| 30 Nov 2023 | £12K | £21K | £9,009 | 2 | |
| 30 Nov 2022 | £1,650 | £15K | £13K | 1 |
Where Secon Group Ltd is registered
The registered office is in London (SW19), in the Merton local authority area, London. Show SW19 2RD on a map.
Other trade companies in SW19
- Firstfixlondon Ltd.Builders
- Rainbow One Construction UK LtdSpecialist contractors
- Base Bloc LimitedBuilders
- Concealed Climate LimitedPlumbers and heating engineers
- Morningside LtdProperty developers
- Cupi-Building LtdBuilders
- Crown Infra London LtdBuilders
- Aj & Co One LtdProperty developers
Shared registered office
38 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 Secon Group 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 31 December 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2028 to 31 Jan 2028 | £150 |
| 1 to 3 months late | 1 Feb 2028 to 31 Mar 2028 | £375 |
| 3 to 6 months late | 1 Apr 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 2029 | 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
- 13727723
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 November 2021 (4 years ago)
- Registered office
- Thomas Harris 1929 Shop Merton Abbey Mills, 18 Watermill Way, London, SW19 2RD
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 30 September 2025
Filing notes for installation companies (insulation, lifts, shutters and similar)
Installation companies (insulation, lifts, shutters, solar and similar) often buy stock and equipment up front, so stock at the year end and capital allowances both affect the tax bill.
Similar companies in London
Other active installation companies (insulation, lifts, shutters and similar) registered in London.
- Secteam Ltd2019
- Secure CCTV Solutions Ltd2026
- Secured Fencing Solutions Ltd2022
- Securelink Networking Ltd2025
- Security 18 Ltd2019
- Selcom Building Services Ltd2006
- Sellspace Limited2026
- Sem Contracting & Consulting Ltd2018
All installation companies (insulation, lifts, shutters and similar) in London · All trades in London · Installers across the UK
Frequently asked questions
When are Secon Group Ltd's accounts due?
Secon Group Ltd's next accounts are due at Companies House by 31 December 2027 (in 445 days), covering the period to 31 March 2027.
When is Secon Group Ltd's CT600 due?
The CT600 for the period to 31 March 2027 is due at HMRC by 31 March 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2028.
Is Secon Group Ltd still trading?
Secon Group 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 Secon Group Ltd do?
Secon Group Ltd is registered under Other construction installation (SIC 43290).
How old is Secon Group Ltd?
Secon Group Ltd was incorporated on 8 November 2021, 4 years ago.
What is the penalty if Secon Group 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 Secon Group 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.