- Companies
- Plumbers and heating engineers
- Southampton
- Gaswarm Heating and Mechanical Ltd
Gaswarm Heating and Mechanical Ltd
- Company number
- 11185407
- Incorporated
- 5 Feb 20188 years trading
- Registered office
- 16 Solent Avenue, Southampton, SO19 6BA
- Nature of business
- Plumbing, heat and air-conditioning installation
Gaswarm Heating and Mechanical Ltd is a 8-year-old private limited company registered in Southampton, company number 11185407, one of 246 plumbing and heating companies in Southampton. Its next accounts are due at Companies House on 30 November 2026, and the CT600 for the period to 28 February 2026 is due at HMRC on 28 February 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 £12K (+35.9%) on the year before, to £45K.
- Net assets rose in 4 of 6 year-on-year comparisons on record.
- Current assets of £44K against £14K owed within a year: 3.2 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 7 years, 2019 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 28 Feb 2025 | £45K | £26K | £44K | £14K | 0 |
| 29 Feb 2024 | £33K | £14K | £30K | £736 | 0 |
| 28 Feb 2023 | £18K | £12K | £19K | £3,844 | 1 |
| 28 Feb 2022 | £5,069 | £996 | £3,174 | £1,347 | 1 |
| 28 Feb 2021 | £2,977 | £0 | £15K | £3,028 | 1 |
| 29 Feb 2020 | £3,216 | £2,436 | £4,450 | £3,053 | 1 |
| 28 Feb 2019 | £11K | £171 | £3,142 | £7,843 |
Where Gaswarm Heating and Mechanical Ltd is registered
The registered office is in Southampton (SO19), in the Southampton local authority area, South East. Show SO19 6BA on a map.
Other trade companies in SO19
- 4LK Cleaning Company LtdCleaning companies
- Nest Path Properties LimitedBuilders
- Dautaj Groundworks LtdBuilders
- Craftline Carpentry Services LtdJoiners and carpenters
- Agape-Wise LimitedCleaning companies
- Cool Enterprises LtdPlumbers and heating engineers
- Jmac Carpentry & Building LtdPlasterers
- Auto Motive Dismantling - Amd LtdMotor traders
What happens if Gaswarm Heating and 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 30 November 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Dec 2026 to 31 Dec 2026 | £150 |
| 1 to 3 months late | 1 Jan 2027 to 28 Feb 2027 | £375 |
| 3 to 6 months late | 1 Mar 2027 to 31 May 2027 | £750 |
| More than 6 months late | From 1 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Mar 2027 | £200 |
| 3 months late | 28 May 2027 | another £200 |
| 6 months late | 28 Aug 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 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
- 11185407
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 5 February 2018 (8 years ago)
- Registered office
- 16 Solent Avenue, Southampton, SO19 6BA
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 28 February (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 28 February 2025
- Last confirmation statement
- 7 March 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.
- GHP South Ltd2017
- GLC Plumbing & Heating Ltd2012
- Gosouth Gas Ltd2013
- GW Gas Ltd2015
- H2O Renewable Energy Ltd2020
- Hamps Plumbing & Heating Limited2023
- Hampshire Heat Solutions Ltd2026
- Hampshire Heating and Cooling Ltd2026
All plumbing and heating companies in Southampton · All trades in Southampton · Plumbers and heating engineers across the UK
Frequently asked questions
When are Gaswarm Heating and Mechanical Ltd's accounts due?
Gaswarm Heating and Mechanical Ltd's next accounts are due at Companies House by 30 November 2026 (in 48 days), covering the period to 28 February 2026.
When is Gaswarm Heating and Mechanical Ltd's CT600 due?
The CT600 for the period to 28 February 2026 is due at HMRC by 28 February 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 December 2026.
Is Gaswarm Heating and Mechanical Ltd still trading?
Gaswarm Heating and 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 Gaswarm Heating and Mechanical Ltd do?
Gaswarm Heating and Mechanical Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Gaswarm Heating and Mechanical Ltd?
Gaswarm Heating and Mechanical Ltd was incorporated on 5 February 2018, 8 years ago.
What is the penalty if Gaswarm Heating and 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 Gaswarm Heating and 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.