- Companies
- Finishing trades
- London
- O'Riordan Mechanical Services Ltd
O'Riordan Mechanical Services Ltd
- Company number
- 16334465
- Incorporated
- 21 Mar 20251 year trading
- Registered office
- Flat 3, 29 Cathcart Hill, Cathcart Hill, London, N19 5QN
- Nature of business
- Other building completion and finishing
O'Riordan Mechanical Services Ltd is a 1-year-old private limited company registered in London, company number 16334465, one of 3,947 building finishing companies in London. Its next accounts are due at Companies House on 21 December 2026, and its first CT600 is due at HMRC on 20 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 O'Riordan Mechanical Services Ltd is registered
The registered office is in London (N19), in the Islington local authority area, London. Show N19 5QN on a map.
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- Alex Maintenance LtdPainters and decorators
What happens if O'Riordan Mechanical Services 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 21 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 22 Dec 2026 to 21 Jan 2027 | £150 |
| 1 to 3 months late | 22 Jan 2027 to 21 Mar 2027 | £375 |
| 3 to 6 months late | 22 Mar 2027 to 21 Jun 2027 | £750 |
| More than 6 months late | From 22 Jun 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
- 16334465
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 21 March 2025 (1 year ago)
- Registered office
- Flat 3, 29 Cathcart Hill, Cathcart Hill, London, N19 5QN
- Nature of business
- Other building completion and finishing (SIC 43390)
- Year end
- 31 March (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 20 March 2026
Filing notes for building finishing companies
Finishing trade companies cover a wide range of work. Most are micro-entities with simple accounts and a straightforward CT600.
Similar companies in London
Other active building finishing companies registered in London.
- O.H Property and Building Limited2025
- Oakley Wilsons Ltd2019
- Oakstone Projects Ltd2026
- Oakwood Refurbishment Limited2009
- Obelisk London Limited2010
- Obsidian Interiors Limited2016
- Od Property Services Ltd2025
- Odds & Sods D.I.Y Ltd2009
All building finishing companies in London · All trades in London · Finishing trades across the UK
Frequently asked questions
When are O'Riordan Mechanical Services Ltd's accounts due?
O'Riordan Mechanical Services Ltd's next accounts are due at Companies House by 21 December 2026 (in 69 days), covering the period to 31 March 2026.
When is O'Riordan Mechanical Services 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 20 March 2026, due by 20 March 2027, and one for the period to 31 March 2026, due by 31 March 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is O'Riordan Mechanical Services Ltd still trading?
O'Riordan Mechanical Services 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'Riordan Mechanical Services Ltd do?
O'Riordan Mechanical Services Ltd is registered under Other building completion and finishing (SIC 43390).
How old is O'Riordan Mechanical Services Ltd?
O'Riordan Mechanical Services Ltd was incorporated on 21 March 2025, 1 year ago.
What is the penalty if O'Riordan Mechanical Services 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'Riordan Mechanical Services 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.