- Companies
- Installers
- Poole
- Thermal Group Limited
Thermal Group Limited
- Company number
- 08590491
- Incorporated
- 1 Jul 201313 years trading
- Registered office
- Suite 1, Ground Floor Unit J1 the Fulcrum, Vantage Way, Poole, Dorset, BH12 4NU
- Nature of business
- Other construction installation
Thermal Group Limited is a 13-year-old private limited company registered in Poole, company number 08590491, one of 79 installation companies (insulation, lifts, shutters and similar) in Poole. 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 £209K (-15.3%) on the year before, to £1.2M.
- Net assets rose in 8 of 9 year-on-year comparisons on record.
- Current assets of £457K against £23K owed within a year: more than 10 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- 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 Mar 2025 | £1.2M | £326K | £457K | £23K | 0 |
| 31 Mar 2024 | £1.4M | £981K | £1.1M | £10K | 2 |
| 31 Mar 2023 | £1.3M | £11K | £122K | £43K | 2 |
| 31 Mar 2022 | £1.3M | £104K | £197K | £111K | 2 |
| 31 Mar 2021 | £1.2M | £172K | £231K | £145K | 2 |
| 31 Mar 2020 | £1M | £77K | £81K | £40K | 2 |
| 31 Mar 2019 | £899K | £30K | £36K | £42K | 2 |
| 31 Mar 2018 | £776K | £17K | £23K | £41K | 2 |
| 31 Mar 2017 | £600K | £42K | £48K | £59K | 2 |
| 31 Mar 2016 | £144K | £105K | £140K | £1,548 |
Where Thermal Group Limited is registered
The registered office is in Poole (BH12), in the Bournemouth, Christchurch and Poole local authority area, South West. Show BH12 4NU on a map.
Other trade companies in BH12
- TVL Cars Poole LtdMechanics and garages
- Top Tier Construction LimitedInstallers
- D&D Drylining & Construction LtdBuilders
- Waters Drainage Services LtdBuilders
- HHC Car Wash LtdMechanics and garages
- Revival Works LtdBuilders
- Dorset Damp Proofing LtdBuilders
- P & C Electrical LtdCivil engineering
Also registered at this address
1 other company uses the same registered office as Thermal Group Limited.
- Aptiva LimitedInstallers
What happens if Thermal Group 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 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
- 08590491
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 1 July 2013 (13 years ago)
- Registered office
- Suite 1, Ground Floor Unit J1 the Fulcrum, Vantage Way, Poole, Dorset, BH12 4NU
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 1 July 2026
- Charges (mortgages)
- 1 outstanding of 2 registered
- Previous names
- Aptiva Thermal Limited (until 17 Aug 2020)
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 Poole
Other active installation companies (insulation, lifts, shutters and similar) registered in Poole.
- Top Tier Construction Limited2026
- Top Tier Drylining and Construction Limited2026
- Trade Price (UK) Conservatories, Windows & Doors Limited2001
- Tradeline Windows Ltd2022
- Unique Aluminium Decks Ltd2021
- Unique Garden Rooms Limited2021
- Warmerhome Installations Limited2019
- Warnerson Construction Ltd2025
All installation companies (insulation, lifts, shutters and similar) in Poole · All trades in Poole · Installers across the UK
Frequently asked questions
When are Thermal Group Limited's accounts due?
Thermal Group Limited's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is Thermal Group Limited'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 Thermal Group Limited still trading?
Thermal Group 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 Thermal Group Limited do?
Thermal Group Limited is registered under Other construction installation (SIC 43290).
How old is Thermal Group Limited?
Thermal Group Limited was incorporated on 1 July 2013, 13 years ago.
What is the penalty if Thermal Group 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 Thermal Group 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.