- Companies
- Specialist contractors
- Southampton
- Specialist Thermal Ltd
Specialist Thermal Ltd
- Company number
- 14659428
- Incorporated
- 13 Feb 20233 years trading
- Registered office
- 20 Holly Close, Sarisbury Green, Southampton, SO31 7BW
- Nature of business
- Other specialised construction activities n.e.c.
Specialist Thermal Ltd is a 3-year-old private limited company registered in Southampton, company number 14659428, one of 202 specialist construction 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 £5,964 on the year before, to £5,966.
- 1 employee on average during the year.
- 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 |
|---|---|---|---|---|---|
| 28 Feb 2025 | £5,966 | £5,965 | £5,966 | £0 | 1 |
| 28 Feb 2024 | £2 | £0 | £0 | £0 | 1 |
Where Specialist Thermal Ltd is registered
The registered office is in Southampton (SO31), in the Fareham local authority area, South East. Show SO31 7BW on a map.
Other trade companies in SO31
- MNC Cleaning LtdCleaning companies
- Mars Eng. LtdMachinery repair and installation
- Amc Plumbing and Heating LtdPlumbers and heating engineers
- Pride & Bloom LtdLandscapers and gardeners
- Hampshire Heating and Cooling LtdPlumbers and heating engineers
- Kelpie Landscape & Build LtdFinishing trades
- FSC Facilities Services LtdInstallers
- Fitton & Redding Services LimitedMechanics and garages
What happens if Specialist Thermal 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
- 14659428
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 February 2023 (3 years ago)
- Registered office
- 20 Holly Close, Sarisbury Green, Southampton, SO31 7BW
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 28 February (accounting reference date)
- Accounts type
- Unaudited abridged
- Last accounts made up to
- 28 February 2025
- Last confirmation statement
- 12 February 2026
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Southampton
Other active specialist construction companies registered in Southampton.
- Spencer Frederick Building Contractors Limited2012
- Spiridion Limited2019
- Steward Carpentry Limited2015
- Structural Group Limited2015
- T and M Cable Services Limited1994
- T Moran Construction Management Limited2018
- T.A.C.K.A Ltd2016
- T.Webber Bricklaying & Building Services Limited2015
All specialist construction companies in Southampton · All trades in Southampton · Specialist contractors across the UK
Frequently asked questions
When are Specialist Thermal Ltd's accounts due?
Specialist Thermal 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 Specialist Thermal 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 Specialist Thermal Ltd still trading?
Specialist Thermal 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 Specialist Thermal Ltd do?
Specialist Thermal Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Specialist Thermal Ltd?
Specialist Thermal Ltd was incorporated on 13 February 2023, 3 years ago.
What is the penalty if Specialist Thermal 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 Specialist Thermal 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.