- Companies
- Civil engineering
- London
- Alph Construction Services Limited
Alph Construction Services Limited
- Company number
- 09459874
- Incorporated
- 26 Feb 201511 years trading
- Registered office
- 52 Swan Mead, London, SE1 4SX
- Nature of business
- Construction of railways and underground railways
Alph Construction Services Limited is a 11-year-old private limited company registered in London, company number 09459874, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 30 November 2026, and the CT600 for the period to 28 February 2026 is due at HMRC on 28 February 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 £271 (+75.1%) on the year before, to £632.
- Net assets rose in 6 of 9 year-on-year comparisons on record.
- Current assets of £15K against £11K owed within a year: 1.3 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 28 Feb 2025 | £632 | £15K | £11K | 2 | |
| 28 Feb 2024 | £361 | £12K | £12K | 2 | |
| 28 Feb 2023 | £1,637 | £8,900 | £11K | 1 | |
| 28 Feb 2022 | £238 | £9,815 | £4,174 | 1 | |
| 28 Feb 2021 | £4,498 | £9,839 | £941 | 1 | |
| 28 Feb 2020 | £540 | £12K | £11K | 1 | |
| 28 Feb 2019 | £405 | £9,005 | £7,650 | ||
| 28 Feb 2018 | £163 | £8,259 | £7,346 | ||
| 28 Feb 2017 | £815 | £11K | £9,402 | ||
| 28 Feb 2016 | £166 | £14K | £14K |
Where Alph Construction Services Limited is registered
The registered office is in London (SE1), in the Southwark local authority area, London. Show SE1 4SX on a map.
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What happens if Alph Construction Services 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 30 November 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Dec 2026 to 31 Dec 2026 | £150 |
| 1 to 3 months late | 1 Jan 2027 to 28 Feb 2027 | £375 |
| 3 to 6 months late | 1 Mar 2027 to 31 May 2027 | £750 |
| More than 6 months late | From 1 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Mar 2027 | £200 |
| 3 months late | 28 May 2027 | another £200 |
| 6 months late | 28 Aug 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 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
- 09459874
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 26 February 2015 (11 years ago)
- Registered office
- 52 Swan Mead, London, SE1 4SX
- Nature of business
- Construction of railways and underground railways (SIC 42120)
- Year end
- 28 February (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 28 February 2025
- Last confirmation statement
- 12 February 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.
- Alpha Rail Plus Ltd2025
- Alstema Limited2023
- Altiora Intelligence Infrastructure Ltd2026
- Altiora Intelligence Limited2026
- Altura Developments Group Limited2026
- Alvera Resourcing Limited2014
- Am 2 PM Protection Limited2007
- Am Consulting Limited2014
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Alph Construction Services Limited's accounts due?
Alph Construction Services Limited's next accounts are due at Companies House by 30 November 2026 (in 49 days), covering the period to 28 February 2026.
When is Alph Construction Services Limited's CT600 due?
The CT600 for the period to 28 February 2026 is due at HMRC by 28 February 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 December 2026.
Is Alph Construction Services Limited still trading?
Alph Construction Services 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 Alph Construction Services Limited do?
Alph Construction Services Limited is registered under Construction of railways and underground railways (SIC 42120).
How old is Alph Construction Services Limited?
Alph Construction Services Limited was incorporated on 26 February 2015, 11 years ago.
What is the penalty if Alph Construction Services 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 Alph Construction Services 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.