- Companies
- Plumbers and heating engineers
- Aylesbury
- K J Barnett Limited
K J Barnett Limited
- Company number
- 05376910
- Incorporated
- 26 Feb 200521 years trading
- Registered office
- Second Floor Kennel Club House, Gatehouse Way, Aylesbury, Buckinghamshire, HP19 8DB
- Nature of business
- Plumbing, heat and air-conditioning installation
K J Barnett Limited is a 21-year-old private limited company registered in Aylesbury, company number 05376910, one of 119 plumbing and heating companies in Aylesbury. Its next accounts are due at Companies House on 31 January 2027, and the CT600 for the period to 30 April 2026 is due at HMRC on 30 April 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 up £5,197 (+15.7%) on the year before, to -£28K.
- Net assets rose in 2 of 4 year-on-year comparisons on record.
- Current assets of £1,198 against £29K owed within a year: 0.0 times cover.
- 1 employee 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 Apr 2025 | -£28K | £1,198 | £29K | 1 | |
| 30 Apr 2024 | -£33K | £34K | 1 | ||
| 30 Apr 2023 | -£34K | £35K | 1 | ||
| 30 Apr 2022 | -£21K | £1,350 | £24K | 1 | |
| 30 Apr 2021 | -£7,889 | £1,937 | £14K | 1 |
Where K J Barnett Limited is registered
The registered office is in Aylesbury (HP19), in the Buckinghamshire local authority area, South East. Show HP19 8DB on a map.
Other trade companies in HP19
- TPV Group LtdProperty developers
- Aylesbury Claims Management LtdMechanics and garages
- Abi Handyman LimitedFinishing trades
- KWK Properties LimitedProperty developers
- Redline Group Properties LimitedProperty developers
- Ridge and Crown Roofing LtdRoofers
- Lightning Performance Auto Services LimitedMechanics and garages
- Spartan Facades LtdSpecialist contractors
Shared registered office
29 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 K J Barnett Limited 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 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Feb 2027 to 28 Feb 2027 | £150 |
| 1 to 3 months late | 1 Mar 2027 to 30 Apr 2027 | £375 |
| 3 to 6 months late | 1 May 2027 to 31 Jul 2027 | £750 |
| More than 6 months late | From 1 Aug 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 May 2027 | £200 |
| 3 months late | 30 Jul 2027 | another £200 |
| 6 months late | 30 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Apr 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
- 05376910
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 26 February 2005 (21 years ago)
- Registered office
- Second Floor Kennel Club House, Gatehouse Way, Aylesbury, Buckinghamshire, HP19 8DB
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 30 April (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 April 2025
- Last confirmation statement
- 26 February 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 Aylesbury
Other active plumbing and heating companies registered in Aylesbury.
- KNS Heating and Plumbing Ltd2025
- Kool Vent Ltd2019
- Kovo Heat Ltd2023
- Lane Services Limited2026
- London Pro Plumbing Ltd2026
- M Wheatley Plumbing and Heating Ltd2018
- M&G Plumbing and Heating Ltd2024
- Mason Plumbing and Heating Limited2015
All plumbing and heating companies in Aylesbury · All trades in Aylesbury · Plumbers and heating engineers across the UK
Frequently asked questions
When are K J Barnett Limited's accounts due?
K J Barnett Limited's next accounts are due at Companies House by 31 January 2027 (in 110 days), covering the period to 30 April 2026.
When is K J Barnett Limited's CT600 due?
The CT600 for the period to 30 April 2026 is due at HMRC by 30 April 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 February 2027.
Is K J Barnett Limited still trading?
K J Barnett Limited 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 K J Barnett Limited do?
K J Barnett Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is K J Barnett Limited?
K J Barnett Limited was incorporated on 26 February 2005, 21 years ago.
What is the penalty if K J Barnett Limited 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 K J Barnett Limited 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.