- Companies
- Civil engineering
- London
- Radon86 Ltd
Radon86 Ltd
- Company number
- 13417782
- Incorporated
- 24 May 20215 years trading
- Registered office
- 44 Broadway, F4, 5TH Floor, London, E15 1XH
- Nature of business
- Construction of other civil engineering projects n.e.c.; Management consultancy activities other than financial management; Urban planning and landscape architectural activities
Radon86 Ltd is a 5-year-old private limited company registered in London, company number 13417782, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 28 February 2027, and the CT600 for the period to 31 May 2026 is due at HMRC on 31 May 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 (-32.2%) on the year before, to -£48K.
- Net assets rose in 0 of 3 year-on-year comparisons on record.
- Current assets of £22K against £322K owed within a year: 0.1 times cover.
- 7 employees on average, down from 10 the year before.
- Balance sheets on record for 4 years, 2022 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 May 2025 | -£48K | £22K | £322K | 7 | |
| 31 May 2024 | -£36K | £2,489 | £23K | 10 | |
| 31 May 2023 | -£12K | £2,195 | £24K | 10 | |
| 31 May 2022 | -£4,260 | £10K | £2,150 | 8 |
Where Radon86 Ltd is registered
The registered office is in London (E15), in the Newham local authority area, London. Show E15 1XH on a map.
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Shared registered office
62 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if Radon86 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 28 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Mar 2027 to 31 Mar 2027 | £150 |
| 1 to 3 months late | 1 Apr 2027 to 31 May 2027 | £375 |
| 3 to 6 months late | 1 Jun 2027 to 31 Aug 2027 | £750 |
| More than 6 months late | From 1 Sep 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2027 | £200 |
| 3 months late | 31 Aug 2027 | another £200 |
| 6 months late | 30 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 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
- 13417782
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 24 May 2021 (5 years ago)
- Registered office
- 44 Broadway, F4, 5TH Floor, London, E15 1XH
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
Management consultancy activities other than financial management (SIC 70229)
Urban planning and landscape architectural activities (SIC 71112) - Year end
- 31 May (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 2 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.
- Rail Infrastructure Management Ltd2015
- Rail Resources Ltd2022
- Rail Safety Provisions Limited2002
- Rail Survey Limited2018
- Railcraft Consulting Ltd2024
- Railway RLT Limited2025
- Railway Solutions Limited2017
- Raim Construction Ltd2024
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Radon86 Ltd's accounts due?
Radon86 Ltd's next accounts are due at Companies House by 28 February 2027 (in 138 days), covering the period to 31 May 2026.
When is Radon86 Ltd's CT600 due?
The CT600 for the period to 31 May 2026 is due at HMRC by 31 May 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 March 2027.
Is Radon86 Ltd still trading?
Radon86 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 Radon86 Ltd do?
Radon86 Ltd is registered under Construction of other civil engineering projects n.e.c. (SIC 42990); Management consultancy activities other than financial management (SIC 70229); Urban planning and landscape architectural activities (SIC 71112).
How old is Radon86 Ltd?
Radon86 Ltd was incorporated on 24 May 2021, 5 years ago.
What is the penalty if Radon86 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 Radon86 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.