- Companies
- Civil engineering
- London
- Bann Kos Limited
Bann Kos Limited
- Company number
- 10954204
- Incorporated
- 8 Sep 20179 years trading
- Registered office
- 48 Blashford, Adelaide Road, London, NW3 3RU
- Nature of business
- Construction of railways and underground railways
Bann Kos Limited is a 9-year-old private limited company registered in London, company number 10954204, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 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 £875 (-10.4%) on the year before, to £7,548.
- Net assets rose in 2 of 6 year-on-year comparisons on record.
- Current assets of £12K against £22K owed within a year: 0.6 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 7 years, 2018 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £7,548 | £12K | £22K | 2 | |
| 31 Mar 2024 | £8,423 | £12K | £56 | 2 | |
| 31 Mar 2023 | £12K | £24K | £9,321 | 3 | |
| 31 Mar 2022 | £13K | £6,000 | £0 | 1 | |
| 31 Mar 2021 | £6,700 | £0 | £0 | 1 | |
| 31 Mar 2020 | £8,340 | £5,000 | £0 | 1 | |
| 30 Sep 2018 | £512 | £511 |
Where Bann Kos Limited is registered
The registered office is in London (NW3), in the Camden local authority area, London. Show NW3 3RU on a map.
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What happens if Bann Kos 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 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 10954204
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 September 2017 (9 years ago)
- Registered office
- 48 Blashford, Adelaide Road, London, NW3 3RU
- Nature of business
- Construction of railways and underground railways (SIC 42120)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 2 September 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.
- Bape Consult Ltd2014
- Barrow Place Ltd2014
- Bartek Decorators Ltd2025
- Basespace London Limited2019
- Bass Clef Electrics Ltd2022
- Bathkitchen Renovation Ltd2025
- Battlestar73 Ltd2026
- BB1 Engineering Limited2012
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Bann Kos Limited's accounts due?
Bann Kos Limited's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is Bann Kos Limited's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is Bann Kos Limited still trading?
Bann Kos 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 Bann Kos Limited do?
Bann Kos Limited is registered under Construction of railways and underground railways (SIC 42120).
How old is Bann Kos Limited?
Bann Kos Limited was incorporated on 8 September 2017, 9 years ago.
What is the penalty if Bann Kos 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 Bann Kos 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.