- Companies
- Plumbers and heating engineers
- Farnborough
- J & J Mechanical Limited
J & J Mechanical Limited
- Company number
- 14932982
- Incorporated
- 13 Jun 20233 years trading
- Registered office
- Terminal E2, Farnborough Airport, Farnborough, Hampshire, GU14 6XA
- Nature of business
- Plumbing, heat and air-conditioning installation; Other business support service activities n.e.c.
J & J Mechanical Limited is a 3-year-old private limited company registered in Farnborough, company number 14932982, one of 43 plumbing and heating companies in Farnborough. 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 up £157K (+645.3%) on the year before, to £182K.
- Current assets of £255K against £141K owed within a year: 1.8 times cover.
- 3 employees on average, up from 0 the year before.
- Balance sheets on record for 3 years, 2024 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Jun 2026 | £182K | £123K | £255K | £141K | 3 |
| 30 Jun 2025 | £24K | £53K | £41K | 0 | |
| 30 Jun 2024 | £7,458 | £6,564 | £3,586 | -1 |
Where J & J Mechanical Limited is registered
The registered office is in Farnborough (GU14), in the Rushmoor local authority area, South East. Show GU14 6XA on a map.
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- Wood Lane Studio LtdJoiners and carpenters
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Also registered at this address
1 other company uses the same registered office as J & J Mechanical Limited.
- Grand Touring Specialties LtdMotor traders
What happens if J & J Mechanical 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 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
- 14932982
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 June 2023 (3 years ago)
- Registered office
- Terminal E2, Farnborough Airport, Farnborough, Hampshire, GU14 6XA
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
Other business support service activities n.e.c. (SIC 82990) - Year end
- 30 June (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 June 2026
- Last confirmation statement
- 12 May 2026
- Previous names
- J & J Heat Limited (until 9 Apr 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 Farnborough
Other active plumbing and heating companies registered in Farnborough.
- John the Plumb Ltd2016
- Linea Home Designs Ltd2014
- Ochre Square Mechanical Services Ltd2021
- Paragon Climate Solutions Ltd2023
- Parisi Heating and Plumbing Limited2025
- Platinum Heating & Plumbing Ltd2017
- Prestige Pro Plumbing and Heating Limited2025
- Quality A/C Limited2023
All plumbing and heating companies in Farnborough · All trades in Farnborough · Plumbers and heating engineers across the UK
Frequently asked questions
When are J & J Mechanical Limited's accounts due?
J & J Mechanical Limited's next accounts are due at Companies House by 31 March 2028 (in 535 days), covering the period to 30 June 2027.
When is J & J Mechanical Limited'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 J & J Mechanical Limited still trading?
J & J Mechanical 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 J & J Mechanical Limited do?
J & J Mechanical Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220); Other business support service activities n.e.c. (SIC 82990).
How old is J & J Mechanical Limited?
J & J Mechanical Limited was incorporated on 13 June 2023, 3 years ago.
What is the penalty if J & J Mechanical 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 J & J Mechanical 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.