Onnes Ltd
- Company number
- 17227413
- Incorporated
- 18 May 2026
- Registered office
- Unit A, 82 James Carter Road, Mildenhall, IP28 7DE
- Nature of business
- Plumbing, heat and air-conditioning installation; Non-specialised wholesale trade; Retail sale of electrical household appliances in specialised stores; Other engineering activities
Onnes Ltd is a newly incorporated private limited company registered in Mildenhall, company number 17227413, one of 23 plumbing and heating companies in Mildenhall. Its next accounts are due at Companies House on 18 February 2028, and its first CT600 is due at HMRC on 17 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.
Is this your company?
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Where Onnes Ltd is registered
The registered office is in Mildenhall (IP28), in the West Suffolk local authority area, East of England. Show IP28 7DE on a map.
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- Local Roofing N Chimneys LimitedRoofers
- SC Joinery and Building Solutions LtdBuilders
- Scuffiq LtdMechanics and garages
- DG Classic Cars LtdMotor traders
- E.B. Fitch Historic Buildings Specialists LtdPainters and decorators
Shared registered office
204 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 Onnes 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 18 February 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 19 Feb 2028 to 18 Mar 2028 | £150 |
| 1 to 3 months late | 19 Mar 2028 to 18 May 2028 | £375 |
| 3 to 6 months late | 19 May 2028 to 18 Aug 2028 | £750 |
| More than 6 months late | From 19 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
- 17227413
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 18 May 2026
- Registered office
- Unit A, 82 James Carter Road, Mildenhall, IP28 7DE
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
Non-specialised wholesale trade (SIC 46900)
Retail sale of electrical household appliances in specialised stores (SIC 47540)
Other engineering activities (SIC 71129) - Year end
- 31 May (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 Mildenhall
Other active plumbing and heating companies registered in Mildenhall.
- Penguin Homes Group Ltd2025
- Phoenix Heating and Plumbing Ltd2024
- Sentry Heat Ltd2025
- UK Climate Control Ltd2026
- Avon Air Con Ltd2026
- Billo's Plumbing and Heating Ltd2025
- BMC Plumbing & Heating Ltd2026
- Cool & Easy (Northern) Ltd2026
All plumbing and heating companies in Mildenhall · All trades in Mildenhall · Plumbers and heating engineers across the UK
Frequently asked questions
When are Onnes Ltd's accounts due?
Onnes Ltd's next accounts are due at Companies House by 18 February 2028 (in 494 days), covering the period to 31 May 2027.
When is Onnes 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 17 May 2027, due by 17 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 Onnes Ltd still trading?
Onnes 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 Onnes Ltd do?
Onnes Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220); Non-specialised wholesale trade (SIC 46900); Retail sale of electrical household appliances in specialised stores (SIC 47540); Other engineering activities (SIC 71129).
How old is Onnes Ltd?
Onnes Ltd was incorporated on 18 May 2026, less than a year ago.
What is the penalty if Onnes 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 Onnes 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.