- Companies
- Plumbers and heating engineers
- Gainsborough
- Knowles Plumbing, Heating & Mechanical Services Ltd
Knowles Plumbing, Heating & Mechanical Services Ltd
- Company number
- 16672943
- Incorporated
- 26 Aug 20251 year trading
- Registered office
- Office 1 Engine House, Marshalls Yard, Gainsborough, Lincolnshire, DN21 2NA
- Nature of business
- Plumbing, heat and air-conditioning installation
Knowles Plumbing, Heating & Mechanical Services Ltd is a 1-year-old private limited company registered in Gainsborough, company number 16672943, one of 37 plumbing and heating companies in Gainsborough. Its next accounts are due at Companies House on 26 May 2027, and its first CT600 is due at HMRC on 25 August 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 Knowles Plumbing, Heating & Mechanical Services Ltd is registered
The registered office is in Gainsborough (DN21), in the West Lindsey local authority area, East Midlands. Show DN21 2NA on a map.
Other trade companies in DN21
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- San San Properties & Developments LtdBuilders
- Pages Garage LtdMechanics and garages
- Elite Touch Home Cleaning LtdCleaning companies
- Gregelec LimitedElectricians
- DRM 2026 LimitedMotor traders
- Elite Carpet Care Gainsborough LtdCleaning companies
Shared registered office
58 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if Knowles Plumbing, Heating & 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 26 May 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 27 May 2027 to 26 Jun 2027 | £150 |
| 1 to 3 months late | 27 Jun 2027 to 26 Aug 2027 | £375 |
| 3 to 6 months late | 27 Aug 2027 to 26 Nov 2027 | £750 |
| More than 6 months late | From 27 Nov 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Sep 2027 | £200 |
| 3 months late | 30 Nov 2027 | another £200 |
| 6 months late | 29 Feb 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Aug 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
- 16672943
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 26 August 2025 (1 year ago)
- Registered office
- Office 1 Engine House, Marshalls Yard, Gainsborough, Lincolnshire, DN21 2NA
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 August (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 26 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 Gainsborough
Other active plumbing and heating companies registered in Gainsborough.
- Lincs Electrical & Plumbing Engineers Limited2005
- M D Hoyland Limited2015
- Mark Wood Heating Ltd2003
- N Proctor Plumbing and Heating Limited2016
- Nigel Allen Plumbers Ltd2010
- PD Services (Lincs ) Ltd2012
- PJT Bathrooms Limited2025
- PJT Plumbing & Heating Limited2025
All plumbing and heating companies in Gainsborough · All trades in Gainsborough · Plumbers and heating engineers across the UK
Frequently asked questions
When are Knowles Plumbing, Heating & Mechanical Services Ltd's accounts due?
Knowles Plumbing, Heating & Mechanical Services Ltd's next accounts are due at Companies House by 26 May 2027 (in 225 days), covering the period to 31 August 2026.
When is Knowles Plumbing, Heating & 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 25 August 2026, due by 25 August 2027, and one for the period to 31 August 2026, due by 31 August 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Knowles Plumbing, Heating & Mechanical Services Ltd still trading?
Knowles Plumbing, Heating & Mechanical Services Ltd is listed as active on the Companies House register (checked 13 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 Knowles Plumbing, Heating & Mechanical Services Ltd do?
Knowles Plumbing, Heating & Mechanical Services Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Knowles Plumbing, Heating & Mechanical Services Ltd?
Knowles Plumbing, Heating & Mechanical Services Ltd was incorporated on 26 August 2025, 1 year ago.
What is the penalty if Knowles Plumbing, Heating & 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 Knowles Plumbing, Heating & Mechanical Services Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 13 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.