- Companies
- Plumbers and heating engineers
- Armagh
- JLJ Mechanical Services Ltd
JLJ Mechanical Services Ltd
- Company number
- NI730983
- Incorporated
- 1 Jul 20251 year trading
- Registered office
- 104 Marlacoo Road, Armagh, County Armagh, BT60 1JN
- Nature of business
- Plumbing, heat and air-conditioning installation
JLJ Mechanical Services Ltd is a 1-year-old private limited company registered in Armagh, company number NI730983, one of 18 plumbing and heating companies in Armagh. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 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 JLJ Mechanical Services Ltd is registered
The registered office is in Armagh (BT60), in the Armagh City, Banbridge and Craigavon local authority area, Northern Ireland. Show BT60 1JN on a map.
Other trade companies in BT60
- Zarya Energy LtdElectricians
- Linton Electrical LtdElectricians
- SGM Development Group LimitedBuilders
- Alloy Doctor LtdMachinery repair and installation
- Vision Maintenance and Cleaning LtdCleaning companies
- Total Floor Design LtdFloor and wall tilers
- Treanor Car Sales LtdMotor traders
- SFM Plumbing LimitedPlumbers and heating engineers
What happens if JLJ 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 31 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- NI730983
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 1 July 2025 (1 year ago)
- Registered office
- 104 Marlacoo Road, Armagh, County Armagh, BT60 1JN
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 March (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 30 June 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 Armagh
Other active plumbing and heating companies registered in Armagh.
- LC Contracts Ltd2025
- N Finlay Refrigeration Ltd2023
- N McKernan Ltd2019
- Nugent Plumbing Ltd2025
- PNB Plumbing Limited2019
- Powertech Refrigeration Ltd2004
- SMS Plumbing & Heating (N.I.) Limited2018
- A & J Plumbing Services Ltd2019
All plumbing and heating companies in Armagh · All trades in Armagh · Plumbers and heating engineers across the UK
Frequently asked questions
When are JLJ Mechanical Services Ltd's accounts due?
JLJ Mechanical Services Ltd's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is JLJ Mechanical Services Ltd's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is JLJ Mechanical Services Ltd still trading?
JLJ Mechanical Services 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 JLJ Mechanical Services Ltd do?
JLJ Mechanical Services Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is JLJ Mechanical Services Ltd?
JLJ Mechanical Services Ltd was incorporated on 1 July 2025, 1 year ago.
What is the penalty if JLJ 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 JLJ Mechanical Services 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.