- Companies
- Civil engineering
- London
- 6Igma Ltd
6Igma Ltd
- Company number
- 17210116
- Incorporated
- 11 May 2026
- Registered office
- 20 Wenlock Road, London, N1 7GU
- Nature of business
- Construction of railways and underground railways; Construction of bridges and tunnels; Management consultancy activities other than financial management; Engineering related scientific and technical consulting activities
6Igma Ltd is a newly incorporated private limited company registered in London, company number 17210116, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 11 February 2028, and its first CT600 is due at HMRC on 10 May 2028.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
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Where 6Igma Ltd is registered
The registered office is in London (N1), in the Hackney local authority area, London. Show N1 7GU on a map.
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- Magic Door Services LimitedMachinery repair and installation
Shared registered office
1,583 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 6Igma 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 11 February 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 12 Feb 2028 to 11 Mar 2028 | £150 |
| 1 to 3 months late | 12 Mar 2028 to 11 May 2028 | £375 |
| 3 to 6 months late | 12 May 2028 to 11 Aug 2028 | £750 |
| More than 6 months late | From 12 Aug 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2028 | £200 |
| 3 months late | 31 Aug 2028 | another £200 |
| 6 months late | 30 Nov 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 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
- 17210116
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 11 May 2026
- Registered office
- 20 Wenlock Road, London, N1 7GU
- Nature of business
- Construction of railways and underground railways (SIC 42120)
Construction of bridges and tunnels (SIC 42130)
Management consultancy activities other than financial management (SIC 70229)
Engineering related scientific and technical consulting activities (SIC 71122) - Year end
- 31 May (accounting reference date)
- Accounts type
- No accounts filed yet
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.
- 73 Architecture Ltd2019
- 7Iyi Professional Services Limited2014
- A Bici Fixing Ltd2016
- A Bowry Limited2020
- A E Railway Solutions Ltd2014
- A H A Construction Ltd2018
- A J Chew Civils Ltd2026
- A M Alexs Ltd2015
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are 6Igma Ltd's accounts due?
6Igma Ltd's next accounts are due at Companies House by 11 February 2028 (in 486 days), covering the period to 31 May 2027.
When is 6Igma Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 10 May 2027, due by 10 May 2028, and one for the period to 31 May 2027, due by 31 May 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is 6Igma Ltd still trading?
6Igma 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 6Igma Ltd do?
6Igma Ltd is registered under Construction of railways and underground railways (SIC 42120); Construction of bridges and tunnels (SIC 42130); Management consultancy activities other than financial management (SIC 70229); Engineering related scientific and technical consulting activities (SIC 71122).
How old is 6Igma Ltd?
6Igma Ltd was incorporated on 11 May 2026, less than a year ago.
What is the penalty if 6Igma 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 6Igma 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.