- Companies
- Plumbers and heating engineers
- Porthmadog
- Carwyn Ap Plymio A Gwresogi Cyf
Carwyn Ap Plymio A Gwresogi Cyf
- Company number
- 16678169
- Incorporated
- 28 Aug 20251 year trading
- Registered office
- ST. Davids Building, Lombard Street, Porthmadog, LL49 9AP
- Nature of business
- Plumbing, heat and air-conditioning installation
Carwyn Ap Plymio A Gwresogi Cyf is a 1-year-old private limited company registered in Porthmadog, company number 16678169, one of 6 plumbing and heating companies in Porthmadog. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 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.
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Where Carwyn Ap Plymio A Gwresogi Cyf is registered
The registered office is in Porthmadog (LL49), in the Gwynedd local authority area, Wales. Show LL49 9AP on a map.
Other trade companies in LL49
- D.Thomas Electrical CyfElectricians
- N Commercial LtdMotor traders
- Bricsan CyfProperty developers
- White Diamond Windows LtdGlaziers
- Porthmadog No1 Hand Car Wash LtdCleaning companies
- Dragon Drone Surveys & Inspections LimitedGroundworks and demolition
- Cu Power LtdMachinery repair and installation
- Llyn Access Scaffolding LtdScaffolders
Also registered at this address
13 other companies use the same registered office as Carwyn Ap Plymio A Gwresogi Cyf.
- B & S Siting LimitedInstallers
- Bricsan CyfProperty developers
- D.Thomas Electrical CyfElectricians
- E H A'i Fab Ynni Adnewyddadol & Trydanol CyfElectricians
- E.Jones Williams and Son LimitedProperty developers
- Elis Llywelyn Williams CyfPlumbers and heating engineers
- Ffenestri Dwyfor Windows CyfGlaziers
- G Jones Contracts LimitedSpecialist contractors
- N Commercial LtdMotor traders
- North West Wales Electrical LtdElectricians
- R J Jones Plumbing & Heating LtdPlumbers and heating engineers
- TK Resin Driveways LtdSpecialist contractors
- White Diamond Windows LtdGlaziers
What happens if Carwyn Ap Plymio A Gwresogi Cyf 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 31 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 16678169
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 28 August 2025 (1 year ago)
- Registered office
- ST. Davids Building, Lombard Street, Porthmadog, LL49 9AP
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 March (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 27 August 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 Porthmadog
Other active plumbing and heating companies registered in Porthmadog.
- DB & E Williams Limited2015
- Elis Llywelyn Williams Cyf2022
- Meddyg Care (Facilities Management) Ltd2022
- R Humphreys & Sons Ltd2008
- R J Jones Plumbing & Heating Ltd2021
All plumbing and heating companies in Porthmadog · All trades in Porthmadog · Plumbers and heating engineers across the UK
Frequently asked questions
When are Carwyn Ap Plymio A Gwresogi Cyf's accounts due?
Carwyn Ap Plymio A Gwresogi Cyf's next accounts are due at Companies House by 31 December 2026 (in 78 days), covering the period to 31 March 2026.
When is Carwyn Ap Plymio A Gwresogi Cyf's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is Carwyn Ap Plymio A Gwresogi Cyf still trading?
Carwyn Ap Plymio A Gwresogi Cyf 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 Carwyn Ap Plymio A Gwresogi Cyf do?
Carwyn Ap Plymio A Gwresogi Cyf is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Carwyn Ap Plymio A Gwresogi Cyf?
Carwyn Ap Plymio A Gwresogi Cyf was incorporated on 28 August 2025, 1 year ago.
What is the penalty if Carwyn Ap Plymio A Gwresogi Cyf 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 Carwyn Ap Plymio A Gwresogi Cyf 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.