- Companies
- Plumbers and heating engineers
- Southampton
- Blue Diamond Heating Services Limited
Blue Diamond Heating Services Limited
- Company number
- 10810785
- Incorporated
- 9 Jun 20179 years trading
- Registered office
- 31 Somerset Avenue, Southampton, Hampshire, SO18 5FP
- Nature of business
- Plumbing, heat and air-conditioning installation
Blue Diamond Heating Services Limited is a 9-year-old private limited company registered in Southampton, company number 10810785, one of 246 plumbing and heating companies in Southampton. Its next accounts are due at Companies House on 31 March 2027, and the CT600 for the period to 30 June 2026 is due at HMRC on 30 June 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 unchanged on the year before, at £8,278.
- Net assets rose in 1 of 7 year-on-year comparisons on record.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 8 years, 2018 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Jun 2025 | £8,278 | £1 | 0 | ||
| 30 Jun 2024 | £8,278 | £1 | 0 | ||
| 30 Jun 2023 | £8,278 | £0 | £1 | 0 | |
| 30 Jun 2022 | £8,278 | £1 | 0 | ||
| 30 Jun 2021 | £8,278 | £1 | 0 | ||
| 30 Jun 2020 | £8,278 | £0 | £1 | 0 | |
| 30 Jun 2019 | £8,248 | £3,874 | £49 | ||
| 30 Jun 2018 | £15K | £30K | £12K |
Where Blue Diamond Heating Services Limited is registered
The registered office is in Southampton (SO18), in the Southampton local authority area, South East. Show SO18 5FP on a map.
Other trade companies in SO18
- Nationwide Steelfixing LtdBuilders
- Terraline LimitedSpecialist contractors
- Omni Group Holdings LtdSpecialist contractors
- Zammit Property Developments LtdProperty developers
- Shotton Marine LtdMachinery repair and installation
- Amiri Mobile Mechanic LtdMechanics and garages
- Roofing Building & Maintenance LtdSpecialist contractors
- The Tidy Life LtdCleaning companies
What happens if Blue Diamond Heating Services 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 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Apr 2027 to 30 Apr 2027 | £150 |
| 1 to 3 months late | 1 May 2027 to 30 Jun 2027 | £375 |
| 3 to 6 months late | 1 Jul 2027 to 30 Sep 2027 | £750 |
| More than 6 months late | From 1 Oct 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jul 2027 | £200 |
| 3 months late | 30 Sep 2027 | another £200 |
| 6 months late | 30 Dec 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Jun 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
- 10810785
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 9 June 2017 (9 years ago)
- Registered office
- 31 Somerset Avenue, Southampton, Hampshire, SO18 5FP
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 30 June (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 June 2025
- Last confirmation statement
- 2 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 Southampton
Other active plumbing and heating companies registered in Southampton.
- BMG Bathrooms and Plumbing Services Limited2014
- BMG Plumbing Services Limited2006
- Bobs Plumbing Limited2016
- Boilers R Us Southampton Limited2012
- Boiling Point Plumbing & Heating Limited2011
- Braeside Property Services Limited2010
- Brennan Plumbing & Heating Limited2007
- Brookfield Heating Ltd2025
All plumbing and heating companies in Southampton · All trades in Southampton · Plumbers and heating engineers across the UK
Frequently asked questions
When are Blue Diamond Heating Services Limited's accounts due?
Blue Diamond Heating Services Limited's next accounts are due at Companies House by 31 March 2027 (in 169 days), covering the period to 30 June 2026.
When is Blue Diamond Heating Services Limited's CT600 due?
The CT600 for the period to 30 June 2026 is due at HMRC by 30 June 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 April 2027.
Is Blue Diamond Heating Services Limited still trading?
Blue Diamond Heating Services 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 Blue Diamond Heating Services Limited do?
Blue Diamond Heating Services Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Blue Diamond Heating Services Limited?
Blue Diamond Heating Services Limited was incorporated on 9 June 2017, 9 years ago.
What is the penalty if Blue Diamond Heating Services 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 Blue Diamond Heating Services 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.