- Companies
- Plumbers and heating engineers
- Blackburn
- 5Diamond Services Ltd
5Diamond Services Ltd
- Company number
- 16670809
- Incorporated
- 26 Aug 20251 year trading
- Registered office
- 31 Woodlands Avenue, Blackburn, BB2 5NW
- Nature of business
- Plumbing, heat and air-conditioning installation
5Diamond Services Ltd is a 1-year-old private limited company registered in Blackburn, company number 16670809, one of 71 plumbing and heating companies in Blackburn. Its next accounts are due at Companies House on 26 May 2027, and its first CT600 is due at HMRC on 25 August 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 5Diamond Services Ltd is registered
The registered office is in Blackburn (BB2), in the Blackburn with Darwen local authority area, North West. Show BB2 5NW on a map.
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What happens if 5Diamond 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 26 May 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 27 May 2027 to 26 Jun 2027 | £150 |
| 1 to 3 months late | 27 Jun 2027 to 26 Aug 2027 | £375 |
| 3 to 6 months late | 27 Aug 2027 to 26 Nov 2027 | £750 |
| More than 6 months late | From 27 Nov 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Sep 2027 | £200 |
| 3 months late | 30 Nov 2027 | another £200 |
| 6 months late | 29 Feb 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Aug 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
- 16670809
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 26 August 2025 (1 year ago)
- Registered office
- 31 Woodlands Avenue, Blackburn, BB2 5NW
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 August (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 25 August 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 Blackburn
Other active plumbing and heating companies registered in Blackburn.
- A C M Heat Services Ltd2022
- A.K.M NW Plumbing & Heating Ltd2025
- Ad Plumbing & Heating Engineers Ltd2023
- Ags Plumbing and Heating Ltd2026
- Amb Plumbing & Heating (North-West) Ltd2019
- Ascot Plumbing & Heating Ltd2019
- B Roberts Plumbing and Heating Limited2020
- Bespoke Bathroom Installs Ltd2021
All plumbing and heating companies in Blackburn · All trades in Blackburn · Plumbers and heating engineers across the UK
Frequently asked questions
When are 5Diamond Services Ltd's accounts due?
5Diamond Services Ltd's next accounts are due at Companies House by 26 May 2027 (in 226 days), covering the period to 31 August 2026.
When is 5Diamond Services Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 25 August 2026, due by 25 August 2027, and one for the period to 31 August 2026, due by 31 August 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is 5Diamond Services Ltd still trading?
5Diamond 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 5Diamond Services Ltd do?
5Diamond Services Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is 5Diamond Services Ltd?
5Diamond Services Ltd was incorporated on 26 August 2025, 1 year ago.
What is the penalty if 5Diamond 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 5Diamond 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.