- Companies
- Civil engineering
- London
- Adff Rail Ltd
Adff Rail Ltd
- Company number
- 09920806
- Incorporated
- 17 Dec 201510 years trading
- Registered office
- 1240 High Road, Flat 9, London, N20 0LR
- Nature of business
- Construction of railways and underground railways
Adff Rail Ltd is a 10-year-old private limited company registered in London, company number 09920806, one of 1,853 civil engineering contractors 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 £17K (-98.6%) on the year before, to £229.
- Net assets rose in 6 of 9 year-on-year comparisons on record.
- Current assets of £3,861 against £3,632 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 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2025 | £229 | £3,861 | £3,632 | 0 | |
| 31 Dec 2024 | £17K | £150 | £13K | £3,227 | 1 |
| 31 Dec 2023 | £10K | £5,456 | £2,852 | 1 | |
| 31 Dec 2022 | £3,177 | £15K | £8,854 | 1 | |
| 31 Dec 2021 | £2,219 | £14K | £9,386 | 1 | |
| 31 Dec 2020 | £410 | £12K | £6,145 | 1 | |
| 31 Dec 2019 | £554 | £9,262 | £8,708 | 1 | |
| 31 Dec 2018 | £387 | £7,080 | £6,693 | ||
| 31 Dec 2017 | £1,845 | £5,696 | £3,851 | ||
| 31 Dec 2016 | £1,248 | £4,540 | £3,292 |
Where Adff Rail Ltd is registered
The registered office is in London (N20), in the Barnet local authority area, London. Show N20 0LR on a map.
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What happens if Adff Rail 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
- 09920806
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 17 December 2015 (10 years ago)
- Registered office
- 1240 High Road, Flat 9, London, N20 0LR
- Nature of business
- Construction of railways and underground railways (SIC 42120)
- Year end
- 31 December (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 December 2025
- Last confirmation statement
- 16 December 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.
- Adhurim Civil Engineering Limited2016
- Adoxtech Ltd.2015
- Adrian Q Ltd2024
- Adrm Site Engineering Services Ltd2014
- Advanced Construction Services Ltd2017
- Advanced Material Logistics UK Limited2013
- Aegis Contract Services Ltd2026
- Aegis Fibre Networks Ltd2025
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Adff Rail Ltd's accounts due?
Adff Rail Ltd's next accounts are due at Companies House by 30 September 2027 (in 353 days), covering the period to 31 December 2026.
When is Adff Rail 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 Adff Rail Ltd still trading?
Adff Rail 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 Adff Rail Ltd do?
Adff Rail Ltd is registered under Construction of railways and underground railways (SIC 42120).
How old is Adff Rail Ltd?
Adff Rail Ltd was incorporated on 17 December 2015, 10 years ago.
What is the penalty if Adff Rail 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 Adff Rail 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.