- Companies
- Plumbers and heating engineers
- Maidstone
- Thermax Limited
Thermax Limited
- Company number
- 09850761
- Incorporated
- 30 Oct 201510 years trading
- Registered office
- 303 Boxley Road, Penenden Heath, Maidstone, ME14 2HD
- Nature of business
- Plumbing, heat and air-conditioning installation
Thermax Limited is a 10-year-old private limited company registered in Maidstone, company number 09850761, one of 124 plumbing and heating companies in Maidstone. Its next accounts are due at Companies House on 31 January 2027, and the CT600 for the period to 30 April 2026 is due at HMRC on 30 April 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Thermax LimitedOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
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 £47K (+328.4%) on the year before, to £61K.
- Net assets rose in 3 of 3 year-on-year comparisons on record.
- Current assets of £234K against £176K owed within a year: 1.3 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 9 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Apr 2025 | £61K | £39K | £234K | £176K | 1 |
| 30 Apr 2024 | £14K | £116K | £110K | £107K | 1 |
| 30 Apr 2023 | -£28K | £155K | £125K | £166K | 1 |
| 30 Apr 2022 | -£92K | £2,444 | £5,059 | £97K | 1 |
| 30 Apr 2021 | £2,654 | £4,951 | £72K | 2 | |
| 30 Apr 2020 | £2,414 | £9,681 | £49K | 2 | |
| 30 Apr 2019 | £3,004 | £9,661 | £9,661 | ||
| 31 Oct 2017 | £12K | £19K | £19K | ||
| 31 Oct 2016 | £3,173 | £21K | £18K |
Where Thermax Limited is registered
The registered office is in Maidstone (ME14), in the Maidstone local authority area, South East. Show ME14 2HD on a map.
Other trade companies in ME14
- Philips 1ST Property Investment LimitedProperty developers
- M D Ducting Supplies LimitedInstallers
- Wired Right Solutions LimitedElectricians
- Traditional Meets Modern Homes LtdProperty developers
- The Wright Group Enterprises LtdMotor traders
- Paul Gasson Roofline LtdRoofers
- Novex Construction LtdBuilders
- L&C Brickwork East Sussex LtdSpecialist contractors
Also registered at this address
3 other companies use the same registered office as Thermax Limited.
- D A Codling LimitedGlaziers
- Everyman Construction Services LimitedProperty developers
- S + P Motor Services LimitedMotor traders
What happens if Thermax 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 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Feb 2027 to 28 Feb 2027 | £150 |
| 1 to 3 months late | 1 Mar 2027 to 30 Apr 2027 | £375 |
| 3 to 6 months late | 1 May 2027 to 31 Jul 2027 | £750 |
| More than 6 months late | From 1 Aug 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 May 2027 | £200 |
| 3 months late | 30 Jul 2027 | another £200 |
| 6 months late | 30 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Apr 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
- 09850761
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 30 October 2015 (10 years ago)
- Registered office
- 303 Boxley Road, Penenden Heath, Maidstone, ME14 2HD
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 30 April (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 April 2025
- Last confirmation statement
- 9 August 2026
- Previous names
- DJS Cellar Services Ltd (until 3 Aug 2022)
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 Maidstone
Other active plumbing and heating companies registered in Maidstone.
- Thornton Plumbing Services Limited2007
- TPS Eco Ltd2022
- Trek Plumbing and Heating Ltd2014
- Urban Cooling North Ltd2025
- Volmech Mechanical Ltd2018
- W8 Property Services Limited2003
- Warmair Mechanical Services Limited2016
- Warmthcraft Solutions Limited2023
All plumbing and heating companies in Maidstone · All trades in Maidstone · Plumbers and heating engineers across the UK
Frequently asked questions
When are Thermax Limited's accounts due?
Thermax Limited's next accounts are due at Companies House by 31 January 2027 (in 111 days), covering the period to 30 April 2026.
When is Thermax Limited's CT600 due?
The CT600 for the period to 30 April 2026 is due at HMRC by 30 April 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 February 2027.
Is Thermax Limited still trading?
Thermax 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 Thermax Limited do?
Thermax Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Thermax Limited?
Thermax Limited was incorporated on 30 October 2015, 10 years ago.
What is the penalty if Thermax 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 Thermax 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.