- Companies
- Installers
- Sudbury
- Thermalair Limited
Thermalair Limited
- Company number
- 01676950
- Incorporated
- 10 Nov 198243 years trading
- Registered office
- Unit 1 Milner Road, Chilton Industrial Estate, Sudbury, Suffolk, CO10 2XG
- Nature of business
- Other construction installation
Thermalair Limited is a 43-year-old private limited company registered in Sudbury, company number 01676950, one of 21 installation companies (insulation, lifts, shutters and similar) in Sudbury. 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 £36K (+12.9%) on the year before, to £320K.
- Net assets rose in 8 of 9 year-on-year comparisons on record.
- Current assets of £335K against £17K owed within a year: more than 10 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 10 years, 2018 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £320K | £335K | £17K | 1 | |
| 31 Mar 2025 | £283K | £300K | £18K | 1 | |
| 31 Mar 2024 | £250K | £299K | £52K | 0 | |
| 31 Mar 2023 | £209K | £227K | £21K | 1 | |
| 31 Mar 2022 | £187K | £219K | £36K | 2 | |
| 31 Mar 2021 | £178K | £201K | £28K | 2 | |
| 31 Mar 2020 | £153K | £205K | £57K | 2 | |
| 30 Mar 2020 | £153K | £205K | £57K | 2 | |
| 31 Mar 2019 | £147K | £215K | £76K | ||
| 31 Mar 2018 | £147K | £260K | £124K |
Where Thermalair Limited is registered
The registered office is in Sudbury (CO10), in the Babergh local authority area, East of England. Show CO10 2XG on a map.
Other trade companies in CO10
- Regrid LtdMotor traders
- Voltage Link LimitedCivil engineering
- The 1 Percent Team LtdProperty developers
- Green Star Heating Services LtdPlumbers and heating engineers
- Ca Scaffolding Services LtdScaffolders
- Delphi Developments LtdProperty developers
- Complete Solutions Group LtdFacilities management
- Finada Corp LimitedBuilders
Also registered at this address
1 other company uses the same registered office as Thermalair Limited.
- Spraybake LimitedMachinery repair and installation
What happens if Thermalair 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 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
- 01676950
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 November 1982 (43 years ago)
- Registered office
- Unit 1 Milner Road, Chilton Industrial Estate, Sudbury, Suffolk, CO10 2XG
- 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
- 7 August 2026
- Charges (mortgages)
- 0 outstanding of 3 registered
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 Sudbury
Other active installation companies (insulation, lifts, shutters and similar) registered in Sudbury.
- Town & Country Interiors (East Anglia) Limited2004
- Unite Build Limited2022
- WBB Contracts Limited2021
- Able Paving Limited2006
- Ampmc Ltd2024
- Cavendish Fencing Ltd2019
- Es Shutters and Awnings Ltd2022
- Heritage Roadways Limited2025
All installation companies (insulation, lifts, shutters and similar) in Sudbury · All trades in Sudbury · Installers across the UK
Frequently asked questions
When are Thermalair Limited's accounts due?
Thermalair Limited's next accounts are due at Companies House by 31 December 2027 (in 444 days), covering the period to 31 March 2027.
When is Thermalair Limited'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 Thermalair Limited still trading?
Thermalair 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 Thermalair Limited do?
Thermalair Limited is registered under Other construction installation (SIC 43290).
How old is Thermalair Limited?
Thermalair Limited was incorporated on 10 November 1982, 43 years ago.
What is the penalty if Thermalair 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 Thermalair 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.