- Companies
- Plumbers and heating engineers
- London
- Trusted Boilers Ltd
Trusted Boilers Ltd
- Company number
- 10558552
- Incorporated
- 11 Jan 20179 years trading
- Registered office
- 128 City Road, London, EC1V 2NX
- Nature of business
- Plumbing, heat and air-conditioning installation
Trusted Boilers Ltd is a 9-year-old private limited company registered in London, company number 10558552, 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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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 down £14K (-76.1%) on the year before, to -£31K.
- Net assets rose in 1 of 7 year-on-year comparisons on record.
- Current assets of £9,546 against £35K owed within a year: 0.3 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 8 years, 2018 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | -£31K | £9,546 | £35K | 2 | |
| 31 Mar 2024 | -£18K | £752 | £13K | 2 | |
| 31 Mar 2023 | -£3,140 | £18K | £13K | 2 | |
| 31 Mar 2022 | £21 | £14K | £23K | 1 | |
| 31 Mar 2021 | -£4,016 | £17K | £7,877 | 1 | |
| 31 Mar 2020 | £848 | £5,805 | £2,887 | 1 | |
| 31 Mar 2019 | £923 | £9,329 | £6,336 | 1 | |
| 31 Mar 2018 | £949 | £15K | £12K | 1 |
Public contracts won
Trusted 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 |
|---|---|---|---|
| Wandle Housing Association Limited | Supply Chain Partners (Trades) Framework | Ceiling, not shown | 25 Mar 2026 |
Where Trusted Boilers Ltd is registered
The registered office is in London (EC1V), in the Islington local authority area, London. Show EC1V 2NX on a map.
Other trade companies in EC1V
- Cardiff Electrical Solutions LtdElectricians
- Edemis Construction LtdBuilders
- Zaylan LtdProperty developers
- Pronto Roofing and Construction LtdRoofers
- Instal Systems LtdPlumbers and heating engineers
- J&R Partners LtdBuilders
- The Tile Craft LtdFinishing trades
- Cathal Od Solutions LtdSpecialist contractors
Shared registered office
2,436 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 Trusted 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
- 10558552
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 11 January 2017 (9 years ago)
- Registered office
- 128 City Road, London, EC1V 2NX
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 10 January 2026
- Previous names
- Gas Mark 1 London Ltd (until 5 Mar 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 London
Other active plumbing and heating companies registered in London.
- TS International Export House Ltd2026
- TSH Plumbing Works Ltd2026
- TT Plumbing Ltd2025
- TTM Gas and Heating Services Limited2025
- Turnock Air Ltd2010
- Tycoon Property Maintenance Ltd2018
- U M Pipe Services Ltd2026
- UK Gas Engineers Solutions Ltd2023
All plumbing and heating companies in London · All trades in London · Plumbers and heating engineers across the UK
Frequently asked questions
When are Trusted Boilers Ltd's accounts due?
Trusted Boilers Ltd's next accounts are due at Companies House by 31 December 2026 (in 78 days), covering the period to 31 March 2026.
When is Trusted 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 Trusted Boilers Ltd still trading?
Trusted 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 Trusted Boilers Ltd do?
Trusted Boilers Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Trusted Boilers Ltd?
Trusted Boilers Ltd was incorporated on 11 January 2017, 9 years ago.
Has Trusted Boilers Ltd won public sector contracts?
Yes. Trusted Boilers Ltd has one contract award from public bodies on Contracts Finder and Find a Tender, most recently from Wandle Housing Association Limited.
What is the penalty if Trusted 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 Trusted 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.