- Companies
- Installers
- London
- Sullivan Thermal Services Ltd
Sullivan Thermal Services Ltd
- Company number
- 12102197
- Incorporated
- 15 Jul 20197 years trading
- Registered office
- 99 Cumberland, Plaistow, London, E13 8LH
- Nature of business
- Other construction installation
Sullivan Thermal Services Ltd is a 7-year-old private limited company registered in London, company number 12102197, one of 2,278 installation companies (insulation, lifts, shutters and similar) in London. Its next accounts are due at Companies House on 31 December 2027, and the CT600 for the period to 31 March 2027 is due at HMRC on 31 March 2028.
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 £25K (+148.1%) on the year before, to £42K.
- Net assets rose in 4 of 6 year-on-year comparisons on record.
- Current assets of £37K against £6,517 owed within a year: 5.7 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 7 years, 2020 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £42K | £37K | £6,517 | 0 | |
| 31 Mar 2025 | £17K | £1,711 | £250 | 0 | |
| 31 Mar 2024 | £19K | £8,265 | £812 | 1 | |
| 31 Mar 2023 | £23K | £11K | £0 | 1 | |
| 31 Mar 2022 | £17K | £18K | £3,533 | 0 | |
| 31 Mar 2021 | £7,798 | £10K | £2,943 | 0 | |
| 31 Mar 2020 | £5,555 | £6,846 | £1,884 | 1 |
Where Sullivan Thermal Services Ltd is registered
The registered office is in London (E13), in the Newham local authority area, London. Show E13 8LH on a map.
Other trade companies in E13
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What happens if Sullivan Thermal 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 31 December 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2028 to 31 Jan 2028 | £150 |
| 1 to 3 months late | 1 Feb 2028 to 31 Mar 2028 | £375 |
| 3 to 6 months late | 1 Apr 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 2029 | 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
- 12102197
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 15 July 2019 (7 years ago)
- Registered office
- 99 Cumberland, Plaistow, London, E13 8LH
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 6 July 2026
Filing notes for installation companies (insulation, lifts, shutters and similar)
Installation companies (insulation, lifts, shutters, solar and similar) often buy stock and equipment up front, so stock at the year end and capital allowances both affect the tax bill.
Similar companies in London
Other active installation companies (insulation, lifts, shutters and similar) registered in London.
- Sun Wise Solar Ltd2025
- Sunhive Ltd2010
- Sunline Energy Ltd2026
- Super Saints Ltd2021
- Super Services Maintennance Ltd2024
- Superior Plans Limited2019
- Superior Plumbing Installations Limited2025
- Supershield Glazing Limited2026
All installation companies (insulation, lifts, shutters and similar) in London · All trades in London · Installers across the UK
Frequently asked questions
When are Sullivan Thermal Services Ltd's accounts due?
Sullivan Thermal Services Ltd's next accounts are due at Companies House by 31 December 2027 (in 444 days), covering the period to 31 March 2027.
When is Sullivan Thermal Services Ltd's CT600 due?
The CT600 for the period to 31 March 2027 is due at HMRC by 31 March 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2028.
Is Sullivan Thermal Services Ltd still trading?
Sullivan Thermal 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 Sullivan Thermal Services Ltd do?
Sullivan Thermal Services Ltd is registered under Other construction installation (SIC 43290).
How old is Sullivan Thermal Services Ltd?
Sullivan Thermal Services Ltd was incorporated on 15 July 2019, 7 years ago.
What is the penalty if Sullivan Thermal 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 Sullivan Thermal 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.