- Companies
- Plumbers and heating engineers
- Croydon
- South Thames Gas Limited
South Thames Gas Limited
- Company number
- 05512245
- Incorporated
- 19 Jul 200521 years trading
- Registered office
- Doshi Accountants Ltd 6TH Floor, Amp House, Dingwall Road, Croydon, CR0 2LX
- Nature of business
- Plumbing, heat and air-conditioning installation
South Thames Gas Limited is a 21-year-old private limited company registered in Croydon, company number 05512245, one of 122 plumbing and heating companies in Croydon. Its next accounts are due at Companies House on 30 April 2027, and the CT600 for the period to 31 July 2026 is due at HMRC on 31 July 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 down £45K (-218.6%) on the year before, to -£24K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £7,140 against £31K owed within a year: 0.2 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jul 2025 | -£24K | £7,140 | £31K | 2 | |
| 31 Jul 2024 | £21K | £8,551 | £25K | 2 | |
| 31 Jul 2023 | £9,967 | £21K | £29K | 2 | |
| 31 Jul 2022 | £7,240 | £12K | £3,179 | 2 | |
| 31 Jul 2021 | £5,712 | £46K | £16K | 2 | |
| 31 Jul 2020 | £2,127 | £46K | £16K | 2 | |
| 31 Jul 2019 | £3,130 | £16K | £19K | ||
| 31 Jul 2018 | £14K | £38K | £9,061 | ||
| 31 Jul 2017 | -£23K | £38K | £9,733 | ||
| 31 Jul 2016 | -£5,315 | £2,311 | £34K | £15K |
Where South Thames Gas Limited is registered
The registered office is in Croydon (CR0), in the Croydon local authority area, London. Show CR0 2LX on a map.
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- Premier Kitchen Installations LimitedJoiners and carpenters
- VR1 Construct LtdBuilders
- Simply Exterior Solutions LimitedCleaning companies
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What happens if South Thames Gas 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 30 April 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 May 2027 to 31 May 2027 | £150 |
| 1 to 3 months late | 1 Jun 2027 to 31 Jul 2027 | £375 |
| 3 to 6 months late | 1 Aug 2027 to 31 Oct 2027 | £750 |
| More than 6 months late | From 1 Nov 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Aug 2027 | £200 |
| 3 months late | 31 Oct 2027 | another £200 |
| 6 months late | 31 Jan 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jul 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
- 05512245
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 19 July 2005 (21 years ago)
- Registered office
- Doshi Accountants Ltd 6TH Floor, Amp House, Dingwall Road, Croydon, CR0 2LX
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 July (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 July 2025
- Last confirmation statement
- 9 November 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 Croydon
Other active plumbing and heating companies registered in Croydon.
- Southern Cooling Services Ltd2018
- SR Gas London Limited2026
- Stace Heating & Bathroom Renovations Limited2025
- Stafa Mechanical Services Ltd2024
- Surrey Environmental Maintenance Limited2002
- Swanson Plumbing and Heating Ltd2013
- T A Best Plumbing Limited2019
- The Plumbing Boys Ltd2024
All plumbing and heating companies in Croydon · All trades in Croydon · Plumbers and heating engineers across the UK
Frequently asked questions
When are South Thames Gas Limited's accounts due?
South Thames Gas Limited's next accounts are due at Companies House by 30 April 2027 (in 199 days), covering the period to 31 July 2026.
When is South Thames Gas Limited's CT600 due?
The CT600 for the period to 31 July 2026 is due at HMRC by 31 July 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 May 2027.
Is South Thames Gas Limited still trading?
South Thames Gas 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 South Thames Gas Limited do?
South Thames Gas Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is South Thames Gas Limited?
South Thames Gas Limited was incorporated on 19 July 2005, 21 years ago.
What is the penalty if South Thames Gas 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 South Thames Gas 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.