- Companies
- Civil engineering
- London
- Austinsite Limited
Austinsite Limited
- Company number
- 10078947
- Incorporated
- 22 Mar 201610 years trading
- Registered office
- 71 Winchfield Road, London, SE26 5TH
- Nature of business
- Construction of railways and underground railways
Austinsite Limited is a 10-year-old private limited company registered in London, company number 10078947, one of 1,853 civil engineering contractors 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 £9,554 (-51.8%) on the year before, to £8,877.
- Net assets rose in 5 of 8 year-on-year comparisons on record.
- Current assets of £8,982 against £105 owed within a year: more than 10 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 9 years, 2018 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £8,877 | £8,982 | £8,982 | £105 | 1 |
| 31 Mar 2025 | £18K | £13K | £22K | £569 | 1 |
| 31 Mar 2024 | £29K | £20K | £37K | £2,313 | 1 |
| 31 Mar 2023 | £24K | £21K | £34K | £2,426 | 1 |
| 31 Mar 2022 | £14K | £27K | £3,304 | 1 | |
| 31 Mar 2021 | £1,712 | £36K | £22K | 0 | |
| 31 Mar 2020 | £1,224 | £2,469 | £1,245 | 0 | |
| 31 Mar 2019 | -£82 | £709 | £791 | 0 | |
| 31 Mar 2018 | £44 | £137 | £93 | 0 |
Where Austinsite Limited is registered
The registered office is in London (SE26), in the Lewisham local authority area, London. Show SE26 5TH on a map.
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What happens if Austinsite 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 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
- 10078947
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 22 March 2016 (10 years ago)
- Registered office
- 71 Winchfield Road, London, SE26 5TH
- Nature of business
- Construction of railways and underground railways (SIC 42120)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 20 March 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.
- Automation Systems and Industrial Control Ltd2020
- Autron UK Limited2026
- Av Fitting Ltd2024
- Aventura UK Limited2000
- Avesta Building Services Ltd2003
- Avm Utilities Ltd2024
- Avram Engineering Limited2025
- Axis Consultancy & Services Ltd2024
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Austinsite Limited's accounts due?
Austinsite Limited's next accounts are due at Companies House by 31 December 2027 (in 445 days), covering the period to 31 March 2027.
When is Austinsite Limited'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 Austinsite Limited still trading?
Austinsite 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 Austinsite Limited do?
Austinsite Limited is registered under Construction of railways and underground railways (SIC 42120).
How old is Austinsite Limited?
Austinsite Limited was incorporated on 22 March 2016, 10 years ago.
What is the penalty if Austinsite 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 Austinsite 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.