- Companies
- Plumbers and heating engineers
- Carrickfergus
- Black Diamond Renovations Ltd
Black Diamond Renovations Ltd
- Company number
- NI673219
- Incorporated
- 8 Oct 20206 years trading
- Registered office
- 4 Hartley Hall, Greenisland, Carrickfergus, Antrim, BT38 8ZR
- Nature of business
- Plumbing, heat and air-conditioning installation
Black Diamond Renovations Ltd is a 6-year-old private limited company registered in Carrickfergus, company number NI673219, one of 6 plumbing and heating companies in Carrickfergus. Its next accounts are due at Companies House on 31 July 2027, and the CT600 for the period to 31 October 2026 is due at HMRC on 31 October 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 £474 (+140.2%) on the year before, to £812.
- Net assets rose in 2 of 4 year-on-year comparisons on record.
- Current assets of £2,570 against £3,382 owed within a year: 0.8 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 |
|---|---|---|---|---|---|
| 31 Oct 2025 | £812 | £2,570 | £3,382 | 1 | |
| 31 Oct 2024 | £338 | £1,954 | £2,292 | 1 | |
| 31 Oct 2023 | £388 | £2,360 | £2,748 | 1 | |
| 31 Oct 2022 | £414 | £1,200 | £1,614 | 1 | |
| 31 Oct 2021 | £243 | £717 | 1 |
Where Black Diamond Renovations Ltd is registered
The registered office is in Carrickfergus (BT38), in the Antrim and Newtownabbey local authority area, Northern Ireland. Show BT38 8ZR on a map.
Other trade companies in BT38
- Bepsontee Autos LimitedMotor traders
- MK Aero Tech LtdMachinery repair and installation
- Agcontractingservices LtdMachinery repair and installation
- Elliott Electrical Contracts LtdInstallers
- CBNZ Aviation LtdMachinery repair and installation
- RCR (N.I.) LtdMechanics and garages
- McAtamney Garden Services LtdLandscapers and gardeners
- Medigas Engineering LimitedFacilities management
What happens if Black Diamond Renovations 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 July 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Aug 2027 to 31 Aug 2027 | £150 |
| 1 to 3 months late | 1 Sep 2027 to 31 Oct 2027 | £375 |
| 3 to 6 months late | 1 Nov 2027 to 31 Jan 2028 | £750 |
| More than 6 months late | From 1 Feb 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Nov 2027 | £200 |
| 3 months late | 31 Jan 2028 | another £200 |
| 6 months late | 30 Apr 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Oct 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
- NI673219
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 October 2020 (6 years ago)
- Registered office
- 4 Hartley Hall, Greenisland, Carrickfergus, Antrim, BT38 8ZR
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 October (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 October 2025
- Last confirmation statement
- 1 October 2025
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 Carrickfergus
Other active plumbing and heating companies registered in Carrickfergus.
- Classique Fireplaces Ltd2021
- Ecoheat N.I. Ltd2023
- GG Vent Ltd2026
- P&H Maintenance Ltd2020
- Paul Harley Plumbing & Heating Ltd2018
All plumbing and heating companies in Carrickfergus · All trades in Carrickfergus · Plumbers and heating engineers across the UK
Frequently asked questions
When are Black Diamond Renovations Ltd's accounts due?
Black Diamond Renovations Ltd's next accounts are due at Companies House by 31 July 2027 (in 291 days), covering the period to 31 October 2026.
When is Black Diamond Renovations Ltd's CT600 due?
The CT600 for the period to 31 October 2026 is due at HMRC by 31 October 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 August 2027.
Is Black Diamond Renovations Ltd still trading?
Black Diamond Renovations 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 Black Diamond Renovations Ltd do?
Black Diamond Renovations Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Black Diamond Renovations Ltd?
Black Diamond Renovations Ltd was incorporated on 8 October 2020, 6 years ago.
What is the penalty if Black Diamond Renovations 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 Black Diamond Renovations 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.