- Companies
- Plumbers and heating engineers
- Northampton
- Op Ventilations System Ltd
Op Ventilations System Ltd
- Company number
- 12028209
- Incorporated
- 3 Jun 20197 years trading
- Registered office
- 151 Abington Avenue, Northampton, NN1 4QB
- Nature of business
- Plumbing, heat and air-conditioning installation
Op Ventilations System Ltd is a 7-year-old private limited company registered in Northampton, company number 12028209, one of 197 plumbing and heating companies in Northampton. Its next accounts are due at Companies House on 31 March 2028, and the CT600 for the period to 30 June 2027 is due at HMRC on 30 June 2028.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets down £558 (-31.1%) on the year before, to £1,237.
- Net assets rose in 2 of 6 year-on-year comparisons on record.
- Current assets of £1,174 against £397 owed within a year: 3.0 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 7 years, 2020 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Jun 2026 | £1,237 | £1,174 | £397 | 1 | |
| 30 Jun 2025 | £1,795 | £189 | £1,762 | 1 | |
| 30 Jun 2024 | -£3,469 | £97 | £97 | £558 | 1 |
| 30 Jun 2023 | -£2,055 | £2,552 | £716 | 1 | |
| 30 Jun 2022 | -£2,019 | £120 | £2,139 | 1 | |
| 30 Jun 2021 | £2,642 | £218 | £2,860 | 1 | |
| 30 Jun 2020 | £2,196 | £5,805 | £8,001 | 1 |
Where Op Ventilations System Ltd is registered
The registered office is in Northampton (NN1), in the West Northamptonshire local authority area, East Midlands. Show NN1 4QB on a map.
Other trade companies in NN1
- Triple Aaa Holdings LtdPainters and decorators
- Cosy Dove+ LimitedBuilders
- Remedy Property Services LtdSpecialist contractors
- Deezi LtdJoiners and carpenters
- Setup Phone LtdRepair services
- Macmarlloe LtdPlumbers and heating engineers
- Robertconstructor LtdBuilders
- DSB Ground Works LtdBuilders
What happens if Op Ventilations System 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 31 March 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Apr 2028 to 30 Apr 2028 | £150 |
| 1 to 3 months late | 1 May 2028 to 30 Jun 2028 | £375 |
| 3 to 6 months late | 1 Jul 2028 to 30 Sep 2028 | £750 |
| More than 6 months late | From 1 Oct 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jul 2028 | £200 |
| 3 months late | 30 Sep 2028 | another £200 |
| 6 months late | 30 Dec 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Jun 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
- 12028209
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 3 June 2019 (7 years ago)
- Registered office
- 151 Abington Avenue, Northampton, NN1 4QB
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 30 June (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 June 2026
- Last confirmation statement
- 7 September 2025
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 Northampton
Other active plumbing and heating companies registered in Northampton.
- Ouse Valley Plumbing Limited2014
- P A Cassidy (Mechanical Services) Limited1998
- Parsons Plumbing & Heating Services Ltd2025
- Percy's Plumbing & Heating Limited2015
- Phase Mechanical Projects Limited2011
- Phase Mechanical Services Limited2009
- Pi Building Services Ltd2008
- Plumb-Line Contracting Limited2001
All plumbing and heating companies in Northampton · All trades in Northampton · Plumbers and heating engineers across the UK
Frequently asked questions
When are Op Ventilations System Ltd's accounts due?
Op Ventilations System Ltd's next accounts are due at Companies House by 31 March 2028 (in 535 days), covering the period to 30 June 2027.
When is Op Ventilations System Ltd's CT600 due?
The CT600 for the period to 30 June 2027 is due at HMRC by 30 June 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 April 2028.
Is Op Ventilations System Ltd still trading?
Op Ventilations System Ltd is listed as active on the Companies House register (checked 12 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 Op Ventilations System Ltd do?
Op Ventilations System Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Op Ventilations System Ltd?
Op Ventilations System Ltd was incorporated on 3 June 2019, 7 years ago.
What is the penalty if Op Ventilations System 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 Op Ventilations System Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 12 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.