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- Ironmark Ltd
Company profile · Plumbers and heating engineers
Ironmark Ltd
Ironmark Ltd is a newly incorporated private limited company registered in London, company number 17454119, one of 2,972 plumbing and heating companies in London. Its next accounts are due at Companies House on 11 June 2028, and its first CT600 is due at HMRC on 10 September 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.
Is this your company?
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Where Ironmark Ltd is registered
The registered office is in London (SE10), in the Greenwich local authority area, London. Show SE10 8HL on a map.
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What happens if Ironmark 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 June 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 12 Jun 2028 to 11 Jul 2028 | £150 |
| 1 to 3 months late | 12 Jul 2028 to 11 Sep 2028 | £375 |
| 3 to 6 months late | 12 Sep 2028 to 11 Dec 2028 | £750 |
| More than 6 months late | From 12 Dec 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2028 | £200 |
| 3 months late | 30 Dec 2028 | another £200 |
| 6 months late | 30 Mar 2029 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 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
- 17454119
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 11 September 2026
- Registered office
- 10 Chesterfield Gardens, Crooms Hill, London, SE10 8HL
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
Temporary employment agency activities (SIC 78200)
Other education n.e.c. (SIC 85590) - Year end
- 30 September (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for plumbing and heating companies
Plumbing and heating companies frequently work under CIS for main contractors and also directly for homeowners, so turnover can mix CIS and non-CIS income.
Similar companies in London
Other active plumbing and heating companies registered in London.
- Iv - An Plumbing Ltd2025
- Ivell Plumbing & Heating Ltd2021
- J A Plumbing & Maintenance Ltd2023
- J B P Plumbing Solutions Ltd2021
- J Bagnall Gas Services Limited2023
- J Ford Heating & Plumbing Services Ltd2023
- J M C Plumbing & Heating (London) Limited2016
- J Pearson Trading Ltd2023
All plumbing and heating companies in London · All trades in London · Plumbers and heating engineers across the UK
Frequently asked questions
When are Ironmark Ltd's accounts due?
Ironmark Ltd's next accounts are due at Companies House by 11 June 2028 (in 608 days), covering the period to 30 September 2027.
When is Ironmark 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 September 2027, due by 10 September 2028, and one for the period to 30 September 2027, due by 30 September 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Ironmark Ltd still trading?
Ironmark 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 Ironmark Ltd do?
Ironmark Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220); Temporary employment agency activities (SIC 78200); Other education n.e.c. (SIC 85590).
How old is Ironmark Ltd?
Ironmark Ltd was incorporated on 11 September 2026, less than a year ago.
What is the penalty if Ironmark 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 Ironmark 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.