- Companies
- Civil engineering
- London
- Blue Boson Tech Ltd
Blue Boson Tech Ltd
- Company number
- 11727942
- Incorporated
- 14 Dec 20187 years trading
- Registered office
- 590 Kingston Road, London, SW20 8DN
- Nature of business
- Construction of water projects; Engineering design activities for industrial process and production; Engineering related scientific and technical consulting activities; Other research and experimental development on natural sciences and engineering
Blue Boson Tech Ltd is a 7-year-old private limited company registered in London, company number 11727942, 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 £12K (-8.4%) on the year before, to -£154K.
- Net assets rose in 1 of 7 year-on-year comparisons on record.
- Current assets of £153 against £155K owed within a year: 0.0 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 8 years, 2018 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2025 | -£154K | £153 | £155K | 1 | |
| 31 Dec 2024 | -£142K | £211 | £143K | 1 | |
| 31 Dec 2023 | -£127K | £171 | £128K | 1 | |
| 31 Dec 2022 | -£106K | £1,089 | £107K | 1 | |
| 31 Dec 2021 | -£76K | £1,473 | £77K | 1 | |
| 31 Dec 2020 | -£60K | £283 | £60K | 1 | |
| 31 Dec 2019 | £44K | £124 | £44K | 1 | |
| 31 Dec 2018 | -£16K | £16K |
Who runs and owns Blue Boson Tech Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officer
| Name | Role | Appointed |
|---|---|---|
| R*** Z*** | Director | Dec 2018 |
1 former officer
| Name | Role | Appointed | Left |
|---|---|---|---|
| V*** V*** | Secretary | Dec 2018 | Dec 2019 |
Person with significant control
Where Blue Boson Tech Ltd is registered
The registered office is in London (SW20), in the Merton local authority area, London. Show SW20 8DN on a map.
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What happens if Blue Boson Tech 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
- 11727942
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 14 December 2018 (7 years ago)
- Registered office
- 590 Kingston Road, London, SW20 8DN
- Nature of business
- Construction of water projects (SIC 42910)
Engineering design activities for industrial process and production (SIC 71121)
Engineering related scientific and technical consulting activities (SIC 71122)
Other research and experimental development on natural sciences and engineering (SIC 72190) - Year end
- 31 December (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 December 2025
- Last confirmation statement
- 19 May 2026
- Previous names
- Blue Boson Ltd (until 4 Sep 2019)
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.
- Blue Property Developments Ltd2019
- Bluemethane Limited2021
- Blutek Engineering Ltd2025
- BNL Fibre Limited2022
- Bokas Specialist Services Ltd.2017
- Bolt Rail Ltd2025
- Bolton Comm Services Ltd2025
- Bonhan Services Ltd2015
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Blue Boson Tech Ltd's accounts due?
Blue Boson Tech Ltd's next accounts are due at Companies House by 30 September 2027 (in 352 days), covering the period to 31 December 2026.
When is Blue Boson Tech 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 Blue Boson Tech Ltd still trading?
Blue Boson Tech 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 Blue Boson Tech Ltd do?
Blue Boson Tech Ltd is registered under Construction of water projects (SIC 42910); Engineering design activities for industrial process and production (SIC 71121); Engineering related scientific and technical consulting activities (SIC 71122); Other research and experimental development on natural sciences and engineering (SIC 72190).
How old is Blue Boson Tech Ltd?
Blue Boson Tech Ltd was incorporated on 14 December 2018, 7 years ago.
Who runs Blue Boson Tech Ltd?
Blue Boson Tech Ltd has 1 active director, the longest-serving appointed in Dec 2018. Their names and service addresses are on the Companies House register.
Who owns Blue Boson Tech Ltd?
One person or company has significant control of Blue Boson Tech Ltd: an individual (owns 75% or more of the shares).
What is the penalty if Blue Boson Tech 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 Blue Boson Tech 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.