- Companies
- Plumbers and heating engineers
- Doncaster
- KB Mechanical Ltd
KB Mechanical Ltd
- Company number
- 12957378
- Incorporated
- 16 Oct 20205 years trading
- Registered office
- 75 Church Street, Bentley, Doncaster, DN5 0BE
- Nature of business
- Plumbing, heat and air-conditioning installation
KB Mechanical Ltd is a 5-year-old private limited company registered in Doncaster, company number 12957378, one of 150 plumbing and heating companies in Doncaster. Its next accounts are due at Companies House on 31 August 2027, and the CT600 for the period to 30 November 2026 is due at HMRC on 30 November 2027.
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 £25K (-39%) on the year before, to £40K.
- Net assets rose in 2 of 4 year-on-year comparisons on record.
- Current assets of £67K against £27K owed within a year: 2.5 times cover.
- 4 employees on average during the year.
- Balance sheets on record for 5 years, 2021 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Nov 2025 | £40K | £67K | £27K | 4 | |
| 30 Nov 2024 | £65K | £66K | £91K | £25K | 4 |
| 31 Oct 2023 | £101K | £93K | £124K | £25K | 3 |
| 31 Oct 2022 | £74K | £99K | £111K | £39K | 3 |
| 31 Oct 2021 | £32K | £11K | £68K | £36K | 3 |
Where KB Mechanical Ltd is registered
The registered office is in Doncaster (DN5), in the Doncaster local authority area, Yorkshire and The Humber. Show DN5 0BE on a map.
Other trade companies in DN5
- D3 Lifestyle Group LimitedMotor traders
- Thurnscoe Bungalows LimitedBuilders
- Mastercraft Roofing and Home Improvements LtdRoofers
- Just Vags LtdMechanics and garages
- Wilson Decorators (Doncaster) LtdPainters and decorators
- Surface Groundworks LimitedLandscapers and gardeners
- Vaulto Automotive Customisation LtdMechanics and garages
- GR33N Group (G3) LtdProperty developers
Also registered at this address
15 other companies use the same registered office as KB Mechanical Ltd.
- 3 Sixty Roofing LtdRoofers
- Apex Roofing Cladding Systems LimitedRoofers
- BC Automotive LimitedMotor traders
- Dynamic Property Services LimitedPlumbers and heating engineers
- Ie Safety Solutions LimitedSpecialist contractors
- Journeyman Automation LimitedInstallers
- JR6 Installs LtdSpecialist contractors
- Just Vags LtdMechanics and garages
- LB Autos LimitedMotor traders
- Mastercraft Roofing and Home Improvements LtdRoofers
- Sandtoft Truck & Trailer Spares LtdMotor traders
- SSS Plumbing & Heating Services LtdPlumbers and heating engineers
- Thermo Hygienic Cladding LtdFloor and wall tilers
- We Fit Developments LtdInstallers
- Winks Joinery LimitedJoiners and carpenters
What happens if KB Mechanical 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 August 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Sep 2027 to 30 Sep 2027 | £150 |
| 1 to 3 months late | 1 Oct 2027 to 30 Nov 2027 | £375 |
| 3 to 6 months late | 1 Dec 2027 to 29 Feb 2028 | £750 |
| More than 6 months late | From 1 Mar 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Dec 2027 | £200 |
| 3 months late | 29 Feb 2028 | another £200 |
| 6 months late | 30 May 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Nov 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
- 12957378
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 16 October 2020 (5 years ago)
- Registered office
- 75 Church Street, Bentley, Doncaster, DN5 0BE
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 30 November (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 November 2025
- Last confirmation statement
- 8 October 2025
- Charges (mortgages)
- 0 outstanding of 1 registered
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 Doncaster
Other active plumbing and heating companies registered in Doncaster.
- Kelly's Boilers & Gas Services Ltd2026
- Kelly's Energy Efficiency Specialists Limited2014
- Kelly's Plumbing & Bathrooms Ltd2026
- KH Plumbing & Heating Services Ltd2023
- L. Oldroyd Plumbing & Heating Limited2024
- LC Plumbing & Heating Services Limited2021
- LDM Plumbing & Heating Services Limited2021
- Leigh Wilson Plumbing & Gas Limited2010
All plumbing and heating companies in Doncaster · All trades in Doncaster · Plumbers and heating engineers across the UK
Frequently asked questions
When are KB Mechanical Ltd's accounts due?
KB Mechanical Ltd's next accounts are due at Companies House by 31 August 2027 (in 323 days), covering the period to 30 November 2026.
When is KB Mechanical Ltd's CT600 due?
The CT600 for the period to 30 November 2026 is due at HMRC by 30 November 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 September 2027.
Is KB Mechanical Ltd still trading?
KB Mechanical 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 KB Mechanical Ltd do?
KB Mechanical Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is KB Mechanical Ltd?
KB Mechanical Ltd was incorporated on 16 October 2020, 5 years ago.
What is the penalty if KB Mechanical 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 KB Mechanical 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.