- Companies
- Plumbers and heating engineers
- London
- Nextherm Ltd
Nextherm Ltd
- Company number
- 16996423
- Incorporated
- 28 Jan 2026
- Registered office
- 18 Byron Road, London, NW7 4AD
- Nature of business
- Plumbing, heat and air-conditioning installation
Nextherm Ltd is a newly incorporated private limited company registered in London, company number 16996423, one of 2,972 plumbing and heating companies in London. Its next accounts are due at Companies House on 28 October 2027, and its first CT600 is due at HMRC on 27 January 2028.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
Is this your company?
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Where Nextherm Ltd is registered
The registered office is in London (NW7), in the Barnet local authority area, London. Show NW7 4AD on a map.
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What happens if Nextherm 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 28 October 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 29 Oct 2027 to 28 Nov 2027 | £150 |
| 1 to 3 months late | 29 Nov 2027 to 28 Jan 2028 | £375 |
| 3 to 6 months late | 29 Jan 2028 to 28 Apr 2028 | £750 |
| More than 6 months late | From 29 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2028 | £200 |
| 3 months late | 30 Apr 2028 | another £200 |
| 6 months late | 31 Jul 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- 16996423
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 28 January 2026
- Registered office
- 18 Byron Road, London, NW7 4AD
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 January (accounting reference date)
- Accounts type
- No accounts filed yet
- Previous names
- Coretech Building Services Ltd (until 2 Feb 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 London
Other active plumbing and heating companies registered in London.
- NG Maintenance Services Ltd2023
- Nicholls Aircon Ltd2024
- Nico Sabatini Ltd2009
- Nicolas & Co Ltd2013
- Nidia’S Decor Ltd2023
- Ninja Aircon Ltd2026
- Nirvana Climate Solutions Ltd2026
- Nitros Limited2007
All plumbing and heating companies in London · All trades in London · Plumbers and heating engineers across the UK
Frequently asked questions
When are Nextherm Ltd's accounts due?
Nextherm Ltd's next accounts are due at Companies House by 28 October 2027 (in 380 days), covering the period to 31 January 2027.
When is Nextherm Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 27 January 2027, due by 27 January 2028, and one for the period to 31 January 2027, due by 31 January 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Nextherm Ltd still trading?
Nextherm 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 Nextherm Ltd do?
Nextherm Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Nextherm Ltd?
Nextherm Ltd was incorporated on 28 January 2026, less than a year ago.
What is the penalty if Nextherm 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 Nextherm 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.