- Companies
- Plumbers and heating engineers
- London
- JSB Boilers Ltd
JSB Boilers Ltd
- Company number
- 12599336
- Incorporated
- 13 May 20206 years trading
- Registered office
- 85 Great Portland Street, London, W1W 7LT
- Nature of business
- Plumbing, heat and air-conditioning installation
JSB Boilers Ltd is a 6-year-old private limited company registered in London, company number 12599336, one of 2,972 plumbing and heating companies in London. 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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Public contracts won
JSB Boilers Ltd has one public sector contract award on record (2026). Source: Contracts Finder and Find a Tender award notices. For all of them the published figure is a shared or multi-year ceiling (a framework place, a multi-supplier award, or more than a small company could hold alone), so no value is shown.
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Epping Forest District Council | Provision of Repairs and Maintenance | Ceiling, not shown | 21 Jul 2026 |
Where JSB Boilers Ltd is registered
The registered office is in London (W1W), in the Westminster local authority area, London. Show W1W 7LT on a map.
Other trade companies in W1W
- Civaris LtdSpecialist contractors
- R&R Construction Group LtdBuilders
- Aurum Cooling LtdPlumbers and heating engineers
- Steam Wood Stone LtdFinishing trades
- Hau Developments LimitedProperty developers
- Group Atlas Financial 83 LtdPainters and decorators
- Energy Reward LtdMotor traders
- Holly’S Housekeeping LtdCleaning companies
Shared registered office
135 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if JSB Boilers 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 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
- 12599336
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 May 2020 (6 years ago)
- Registered office
- 85 Great Portland Street, London, W1W 7LT
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 12 May 2026
- Charges (mortgages)
- 1 outstanding of 1 registered
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.
- JSP Gas Limited2017
- JST Trades Ltd2026
- JSW Plumbing & Heating Ltd2026
- JTK Limited2023
- JTM Maintenance Ltd2018
- Julidesign Architecture Services Ltd2021
- Just Cool Air Condition and Refrigeration Ltd2026
- Just Fix Ltd2020
All plumbing and heating companies in London · All trades in London · Plumbers and heating engineers across the UK
Frequently asked questions
When are JSB Boilers Ltd's accounts due?
JSB Boilers Ltd's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is JSB Boilers Ltd'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 JSB Boilers Ltd still trading?
JSB Boilers 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 JSB Boilers Ltd do?
JSB Boilers Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is JSB Boilers Ltd?
JSB Boilers Ltd was incorporated on 13 May 2020, 6 years ago.
Has JSB Boilers Ltd won public sector contracts?
Yes. JSB Boilers Ltd has one contract award from public bodies on Contracts Finder and Find a Tender, most recently from Epping Forest District Council.
What is the penalty if JSB Boilers 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 JSB Boilers 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.