- Companies
- Plumbers and heating engineers
- Durham
- Poseidon P&H Ltd
Poseidon P&H Ltd
- Company number
- 16583701
- Incorporated
- 15 Jul 20251 year trading
- Registered office
- 38 Westgarth Grove, Shotton Colliery, Durham, DH6 2YB
- Nature of business
- Plumbing, heat and air-conditioning installation; Other construction installation
Poseidon P&H Ltd is a 1-year-old private limited company registered in Durham, company number 16583701, one of 44 plumbing and heating companies in Durham. Its next accounts are due at Companies House on 15 April 2027, and its first CT600 is due at HMRC on 14 July 2027.
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 Poseidon P&H Ltd is registered
The registered office is in Durham (DH6), in the County Durham local authority area, North East. Show DH6 2YB on a map.
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What happens if Poseidon P&H 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 15 April 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 16 Apr 2027 to 15 May 2027 | £150 |
| 1 to 3 months late | 16 May 2027 to 15 Jul 2027 | £375 |
| 3 to 6 months late | 16 Jul 2027 to 15 Oct 2027 | £750 |
| More than 6 months late | From 16 Oct 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Aug 2027 | £200 |
| 3 months late | 31 Oct 2027 | another £200 |
| 6 months late | 31 Jan 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jul 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
- 16583701
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 15 July 2025 (1 year ago)
- Registered office
- 38 Westgarth Grove, Shotton Colliery, Durham, DH6 2YB
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
Other construction installation (SIC 43290) - Year end
- 31 July (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 14 July 2026
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 Durham
Other active plumbing and heating companies registered in Durham.
- R.M. Myers & Co Limited1997
- Rmac Heating & Plumbing Ltd2021
- Smart Ways Heating & Plumbing Ltd2020
- T.W. Steam & Heating Services Limited1974
- Thermal North Group Ltd2020
- Thermo Systems Ltd2023
- Abbotts Heating and Plumbing Ltd2023
- As Gas Services Ltd2017
All plumbing and heating companies in Durham · All trades in Durham · Plumbers and heating engineers across the UK
Frequently asked questions
When are Poseidon P&H Ltd's accounts due?
Poseidon P&H Ltd's next accounts are due at Companies House by 15 April 2027 (in 184 days), covering the period to 31 July 2026.
When is Poseidon P&H 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 14 July 2026, due by 14 July 2027, and one for the period to 31 July 2026, due by 31 July 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Poseidon P&H Ltd still trading?
Poseidon P&H 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 Poseidon P&H Ltd do?
Poseidon P&H Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220); Other construction installation (SIC 43290).
How old is Poseidon P&H Ltd?
Poseidon P&H Ltd was incorporated on 15 July 2025, 1 year ago.
What is the penalty if Poseidon P&H 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 Poseidon P&H 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.