- Companies
- Specialist contractors
- Caernarfon
- O'Brien Offshore Ltd
O'Brien Offshore Ltd
- Company number
- 16383264
- Incorporated
- 11 Apr 20251 year trading
- Registered office
- Trem Y Mor, Gallt Y Foel, Caernarfon, LL55 3EF
- Nature of business
- Other specialised construction activities n.e.c.
O'Brien Offshore Ltd is a 1-year-old private limited company registered in Caernarfon, company number 16383264, one of 14 specialist construction companies in Caernarfon. Its next accounts are due at Companies House on 11 January 2027, and its first CT600 is due at HMRC on 10 April 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 O'Brien Offshore Ltd is registered
The registered office is in Caernarfon (LL55), in the Gwynedd local authority area, Wales. Show LL55 3EF on a map.
Other trade companies in LL55
- Gic Construction & Groundworks LtdInstallers
- Caton Site Welding LtdMachinery repair and installation
- Celtic Heritage Stonemasonry LimitedCivil engineering
- Celtic Heritage Construction LimitedBuilders
- 31 High ST LimitedProperty developers
- Robertson’S Property Services LtdSpecialist contractors
- Tirion Solutions LtdElectricians
- Melltd LtdProperty developers
What happens if O'Brien Offshore 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 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 12 Jan 2027 to 11 Feb 2027 | £150 |
| 1 to 3 months late | 12 Feb 2027 to 11 Apr 2027 | £375 |
| 3 to 6 months late | 12 Apr 2027 to 11 Jul 2027 | £750 |
| More than 6 months late | From 12 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 May 2027 | £200 |
| 3 months late | 30 Jul 2027 | another £200 |
| 6 months late | 30 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Apr 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
- 16383264
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 11 April 2025 (1 year ago)
- Registered office
- Trem Y Mor, Gallt Y Foel, Caernarfon, LL55 3EF
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 30 April (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 10 April 2026
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Caernarfon
Other active specialist construction companies registered in Caernarfon.
- PSR Controls Ltd2020
- R.G. Owen Limited2002
- Robertson’S Property Services Ltd2026
- Clarity Aquatics and Landscapes Ltd2018
- Gareth Williams Marine Services Limited2013
- Gwalch Cyf2015
- Gwynedd Insulation Limited2010
- Gwynedd Safeflue Specialists Ltd2018
All specialist construction companies in Caernarfon · All trades in Caernarfon · Specialist contractors across the UK
Frequently asked questions
When are O'Brien Offshore Ltd's accounts due?
O'Brien Offshore Ltd's next accounts are due at Companies House by 11 January 2027 (in 90 days), covering the period to 30 April 2026.
When is O'Brien Offshore 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 April 2026, due by 10 April 2027, and one for the period to 30 April 2026, due by 30 April 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is O'Brien Offshore Ltd still trading?
O'Brien Offshore 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 O'Brien Offshore Ltd do?
O'Brien Offshore Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is O'Brien Offshore Ltd?
O'Brien Offshore Ltd was incorporated on 11 April 2025, 1 year ago.
What is the penalty if O'Brien Offshore 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 O'Brien Offshore 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.