- Companies
- Civil engineering
- London
- Squarerail Limited
Squarerail Limited
- Company number
- 15317655
- Incorporated
- 29 Nov 20232 years trading
- Registered office
- 4TH Floor 45 Fitzroy Street, Fitzrovia, London, W1T 6EB
- Nature of business
- Construction of railways and underground railways
Squarerail Limited is a 2-year-old private limited company registered in London, company number 15317655, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 29 August 2027, and the CT600 for the period to 29 November 2026 is due at HMRC on 29 November 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 £336 (-82.6%) on the year before, to £71.
- Current assets of £132 against £61 owed within a year: 2.2 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 2 years, 2024 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 29 Nov 2025 | £71 | £132 | £61 | 1 | |
| 29 Nov 2024 | £407 | £378 | £29 | 1 |
Where Squarerail Limited is registered
The registered office is in London (W1T), in the Camden local authority area, London. Show W1T 6EB on a map.
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Also registered at this address
1 other company uses the same registered office as Squarerail Limited.
- London Elite Trades LtdBuilders
What happens if Squarerail 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 29 August 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 30 Aug 2027 to 29 Sep 2027 | £150 |
| 1 to 3 months late | 30 Sep 2027 to 29 Nov 2027 | £375 |
| 3 to 6 months late | 30 Nov 2027 to 29 Feb 2028 | £750 |
| More than 6 months late | From 1 Mar 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 30 Nov 2027 | £200 |
| 3 months late | 29 Feb 2028 | another £200 |
| 6 months late | 29 May 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 29 Nov 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
- 15317655
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 29 November 2023 (2 years ago)
- Registered office
- 4TH Floor 45 Fitzroy Street, Fitzrovia, London, W1T 6EB
- Nature of business
- Construction of railways and underground railways (SIC 42120)
- Year end
- 29 November (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 29 November 2025
- Last confirmation statement
- 13 November 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.
- SS Engineering Limited2024
- SSK Construction Ltd2014
- ST Albans Groundworks Ltd2026
- ST Ivy Maintenance & Electrical Solutions Ltd2025
- Stalwarth Ltd2025
- Steadwise Solutions Trading Ltd2023
- Sterling Engineering and Construction Ltd2026
- Steven Hann Limited2012
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Squarerail Limited's accounts due?
Squarerail Limited's next accounts are due at Companies House by 29 August 2027 (in 321 days), covering the period to 29 November 2026.
When is Squarerail Limited's CT600 due?
The CT600 for the period to 29 November 2026 is due at HMRC by 29 November 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 30 August 2027.
Is Squarerail Limited still trading?
Squarerail 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 Squarerail Limited do?
Squarerail Limited is registered under Construction of railways and underground railways (SIC 42120).
How old is Squarerail Limited?
Squarerail Limited was incorporated on 29 November 2023, 2 years ago.
What is the penalty if Squarerail 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 Squarerail 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.