- Companies
- Plumbers and heating engineers
- Durham
- Thermo Systems Ltd
Thermo Systems Ltd
- Company number
- 14717752
- Incorporated
- 9 Mar 20233 years trading
- Registered office
- Boyne Colliery House Sleetburn Lane, Langley Moor, Durham, DH7 8LQ
- Nature of business
- Plumbing, heat and air-conditioning installation
Thermo Systems Ltd is a 3-year-old private limited company registered in Durham, company number 14717752, one of 44 plumbing and heating companies in Durham. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 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 £324 (-95%) on the year before, to £17.
- Current assets of £3,065 against £2,748 owed within a year: 1.1 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 2 years, 2024 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £17 | £3,065 | £2,748 | 0 | |
| 31 Mar 2024 | £341 | £2,128 | £1,487 | 0 |
Where Thermo Systems Ltd is registered
The registered office is in Durham (DH7), in the County Durham local authority area, North East. Show DH7 8LQ on a map.
Other trade companies in DH7
- Kenny's Groundworks LimitedCivil engineering
- Fastfit Automotive LimitedMechanics and garages
- Adobe Builders LtdFinishing trades
- Unlimited Labs LtdCivil engineering
- HLS Domestic Installations LtdInstallers
- J Moore Brickwork LtdBuilders
- Signature Developments (Ne) LtdBuilders
- D.R Groundworks & Landscaping Services LtdBuilders
What happens if Thermo Systems 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 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 14717752
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 9 March 2023 (3 years ago)
- Registered office
- Boyne Colliery House Sleetburn Lane, Langley Moor, Durham, DH7 8LQ
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 8 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 Durham
Other active plumbing and heating companies registered in Durham.
- Abbotts Heating and Plumbing Ltd2023
- As Gas Services Ltd2017
- Asd Property Projects Ltd2025
- BS Heating Solutions (Ne) Limited2021
- C and C Campbell Limited2022
- CBR Refrigeration & Air Conditioning Ltd2023
- David Parsons Limited2000
- DJS Heating & Renewables Ltd2021
All plumbing and heating companies in Durham · All trades in Durham · Plumbers and heating engineers across the UK
Frequently asked questions
When are Thermo Systems Ltd's accounts due?
Thermo Systems Ltd's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is Thermo Systems Ltd's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is Thermo Systems Ltd still trading?
Thermo Systems 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 Thermo Systems Ltd do?
Thermo Systems Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Thermo Systems Ltd?
Thermo Systems Ltd was incorporated on 9 March 2023, 3 years ago.
What is the penalty if Thermo Systems 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 Thermo Systems 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.