- Companies
- Plumbers and heating engineers
- Castlewellan
- NI Mechanical Ltd
NI Mechanical Ltd
- Company number
- NI671596
- Incorporated
- 6 Aug 20206 years trading
- Registered office
- 11B Burrenreagh Road, Castlewellan, BT31 9HH
- Nature of business
- Plumbing, heat and air-conditioning installation
NI Mechanical Ltd is a 6-year-old private limited company registered in Castlewellan, company number NI671596, one of 11 plumbing and heating companies in Castlewellan. Its next accounts are due at Companies House on 31 October 2027, and the CT600 for the period to 31 January 2027 is due at HMRC on 31 January 2028.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Where NI Mechanical Ltd is registered
The registered office is in Castlewellan (BT31), in the Newry, Mourne and Down local authority area, Northern Ireland. Show BT31 9HH on a map.
Other trade companies in BT31
- Ogm26 LtdGroundworks and demolition
- Treadline Tyre & Auto Services LtdMechanics and garages
- CB Fire Compliance LimitedSpecialist contractors
- Cea Joinery LtdJoiners and carpenters
- NI.CBR LtdMechanics and garages
- S.D.E Electrical Systems LtdElectricians
- Jam Civils & Utilities LtdGroundworks and demolition
- B McVeigh Mechanical LtdPlumbers and heating engineers
What happens if NI 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 October 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Nov 2027 to 30 Nov 2027 | £150 |
| 1 to 3 months late | 1 Dec 2027 to 31 Jan 2028 | £375 |
| 3 to 6 months late | 1 Feb 2028 to 30 Apr 2028 | £750 |
| More than 6 months late | From 1 May 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2028 | £200 |
| 3 months late | 30 Apr 2028 | another £200 |
| 6 months late | 31 Jul 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- NI671596
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 6 August 2020 (6 years ago)
- Registered office
- 11B Burrenreagh Road, Castlewellan, BT31 9HH
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 January (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 January 2026
- Last confirmation statement
- 5 August 2026
- Previous names
- NI Mechanical Group Ltd (until 10 Sep 2020)
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 Castlewellan
Other active plumbing and heating companies registered in Castlewellan.
- PDM Plumbing Services Ltd2018
- Agd Plumbing & Heating Ltd2017
- B McVeigh Mechanical Ltd2026
- C Kane Plumbing & Heating Ltd2017
- Cisco Plumbing & Heating Ltd2026
- Elite Plumbing, Heating & Gas Ltd2016
- Hillview Plumbing Ltd2015
- JS Mechanical 2022 Ltd2022
All plumbing and heating companies in Castlewellan · All trades in Castlewellan · Plumbers and heating engineers across the UK
Frequently asked questions
When are NI Mechanical Ltd's accounts due?
NI Mechanical Ltd's next accounts are due at Companies House by 31 October 2027 (in 383 days), covering the period to 31 January 2027.
When is NI Mechanical Ltd's CT600 due?
The CT600 for the period to 31 January 2027 is due at HMRC by 31 January 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 November 2027.
Is NI Mechanical Ltd still trading?
NI 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 NI Mechanical Ltd do?
NI Mechanical Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is NI Mechanical Ltd?
NI Mechanical Ltd was incorporated on 6 August 2020, 6 years ago.
What is the penalty if NI 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 NI 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.