- Companies
- Plumbers and heating engineers
- Northampton
- Clas Plumbing Ltd
Clas Plumbing Ltd
- Company number
- 16908577
- Incorporated
- 13 Dec 2025
- Registered office
- 10 Spelhoe Street, Northampton, NN3 5AX
- Nature of business
- Plumbing, heat and air-conditioning installation
Clas Plumbing Ltd is a newly incorporated private limited company registered in Northampton, company number 16908577, one of 197 plumbing and heating companies in Northampton. Its next accounts are due at Companies House on 13 September 2027, and its first CT600 is due at HMRC on 12 December 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 Clas Plumbing Ltd is registered
The registered office is in Northampton (NN3), in the West Northamptonshire local authority area, East Midlands. Show NN3 5AX on a map.
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What happens if Clas Plumbing 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 13 September 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 14 Sep 2027 to 13 Oct 2027 | £150 |
| 1 to 3 months late | 14 Oct 2027 to 13 Dec 2027 | £375 |
| 3 to 6 months late | 14 Dec 2027 to 13 Mar 2028 | £750 |
| More than 6 months late | From 14 Mar 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2028 | £200 |
| 3 months late | 31 Mar 2028 | another £200 |
| 6 months late | 30 Jun 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 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
- 16908577
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 December 2025
- Registered office
- 10 Spelhoe Street, Northampton, NN3 5AX
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 December (accounting reference date)
- Accounts type
- No accounts filed yet
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.
- Clyde Mechanical Services Limited2006
- CNS Heating, Plumbing and Air Conditioning Ltd2026
- Co2 Gas & Heating Ltd2026
- Collingtree Cool Ltd2026
- Cool Space Solutions Limited2025
- Cooltherm Air Conditioning Ltd2022
- County Cooling & Electrical Ltd2026
- CSC Plumbing and Heating Ltd2019
All plumbing and heating companies in Northampton · All trades in Northampton · Plumbers and heating engineers across the UK
Frequently asked questions
When are Clas Plumbing Ltd's accounts due?
Clas Plumbing Ltd's next accounts are due at Companies House by 13 September 2027 (in 335 days), covering the period to 31 December 2026.
When is Clas Plumbing 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 12 December 2026, due by 12 December 2027, and one for the period to 31 December 2026, due by 31 December 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Clas Plumbing Ltd still trading?
Clas Plumbing 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 Clas Plumbing Ltd do?
Clas Plumbing Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Clas Plumbing Ltd?
Clas Plumbing Ltd was incorporated on 13 December 2025, less than a year ago.
What is the penalty if Clas Plumbing 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 Clas Plumbing 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.