- Companies
- Civil engineering
- London
- Alfa Seven Limited
Alfa Seven Limited
- Company number
- 09289991
- Incorporated
- 31 Oct 201411 years trading
- Registered office
- 1 Houndsfield Road, London, N9 7RA
- Nature of business
- Construction of railways and underground railways; Urban and suburban passenger railway transportation by underground, metro and similar systems
Alfa Seven Limited is a 11-year-old private limited company registered in London, company number 09289991, 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 down £221 (-64.8%) on the year before, to £120.
- Net assets rose in 4 of 8 year-on-year comparisons on record.
- Current assets of £4,006 against £1,045 owed within a year: 3.8 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 9 years, 2017 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Oct 2025 | £120 | £4,006 | £1,045 | 2 | |
| 31 Oct 2024 | £341 | £5,972 | £1,875 | 2 | |
| 31 Oct 2023 | £142 | £3,622 | £1,809 | 2 | |
| 31 Oct 2022 | £418 | £1,512 | £1,508 | 2 | |
| 31 Oct 2021 | £211 | £858 | £2,313 | 2 | |
| 31 Oct 2020 | £67 | £86 | £1,000 | 3 | |
| 31 Oct 2019 | £22 | £1,075 | £503 | 3 | |
| 31 Oct 2018 | £88 | £827 | £189 | 3 | |
| 31 Oct 2017 | £1,079 | £75 | £1,372 | 3 |
Where Alfa Seven Limited is registered
The registered office is in London (N9), in the Enfield local authority area, London. Show N9 7RA on a map.
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What happens if Alfa Seven 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
- 09289991
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 31 October 2014 (11 years ago)
- Registered office
- 1 Houndsfield Road, London, N9 7RA
- Nature of business
- Construction of railways and underground railways (SIC 42120)
Urban and suburban passenger railway transportation by underground, metro and similar systems (SIC 49311) - Year end
- 31 October (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 October 2025
- Last confirmation statement
- 31 October 2025
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.
- Allswell Construction Ltd2024
- Alph Construction Services Limited2015
- Alpha Rail Plus Ltd2025
- Alstema Limited2023
- Altiora Intelligence Infrastructure Ltd2026
- Altiora Intelligence Limited2026
- Altura Developments Group Limited2026
- Alvera Resourcing Limited2014
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Alfa Seven Limited's accounts due?
Alfa Seven Limited's next accounts are due at Companies House by 31 July 2027 (in 291 days), covering the period to 31 October 2026.
When is Alfa Seven 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 Alfa Seven Limited still trading?
Alfa Seven 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 Alfa Seven Limited do?
Alfa Seven Limited is registered under Construction of railways and underground railways (SIC 42120); Urban and suburban passenger railway transportation by underground, metro and similar systems (SIC 49311).
How old is Alfa Seven Limited?
Alfa Seven Limited was incorporated on 31 October 2014, 11 years ago.
What is the penalty if Alfa Seven 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 Alfa Seven 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.