- Companies
- Plumbers and heating engineers
- London
- Stonemark Engineering Limited
Stonemark Engineering Limited
- Company number
- 03146000
- Incorporated
- 15 Jan 199630 years trading
- Registered office
- 19TH Floor, 1 Westfield Avenue, London, E20 1HZ
- Nature of business
- Plumbing, heat and air-conditioning installation
Stonemark Engineering Limited is a 30-year-old private limited company registered in London, company number 03146000, one of 2,972 plumbing and heating companies in London. Its next accounts are due at Companies House on 31 March 2027, and the CT600 for the period to 30 June 2026 is due at HMRC on 30 June 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 up £131K (+25.8%) on the year before, to £639K.
- Net assets rose in 9 of 9 year-on-year comparisons on record.
- Current assets of £722K against £111K owed within a year: 6.5 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Jun 2025 | £639K | £628K | £722K | £111K | 0 |
| 30 Jun 2024 | £508K | £457K | £589K | £98K | 2 |
| 30 Jun 2023 | £438K | £153K | £459K | £42K | 1 |
| 30 Jun 2022 | £404K | £262K | £475K | £99K | 1 |
| 30 Jun 2021 | £352K | £182K | £423K | £88K | 1 |
| 30 Jun 2020 | £236K | £50K | £307K | £83K | 1 |
| 30 Jun 2019 | £228K | £44K | £262K | £38K | |
| 30 Jun 2018 | £192K | £80K | £224K | £36K | |
| 30 Jun 2017 | £165K | £19K | £253K | £95K | |
| 30 Jun 2016 | £160K | £49K | £273K | £121K |
Where Stonemark Engineering Limited is registered
The registered office is in London (E20), in the Newham local authority area, London. Show E20 1HZ on a map.
Other trade companies in E20
- Align Car Parts LtdMotor traders
- Align Parts LtdMotor traders
- Sovexa LimitedBuilders
- Champion Trade LtdBuilders
- Superb Tiling LtdBuilders
- JFN Property Management LtdCleaning companies
- Biggs Services LtdScaffolders
- Isaneza Builds LimitedBuilders
Shared registered office
39 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 Stonemark Engineering 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 March 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Apr 2027 to 30 Apr 2027 | £150 |
| 1 to 3 months late | 1 May 2027 to 30 Jun 2027 | £375 |
| 3 to 6 months late | 1 Jul 2027 to 30 Sep 2027 | £750 |
| More than 6 months late | From 1 Oct 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jul 2027 | £200 |
| 3 months late | 30 Sep 2027 | another £200 |
| 6 months late | 30 Dec 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Jun 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
- 03146000
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 15 January 1996 (30 years ago)
- Registered office
- 19TH Floor, 1 Westfield Avenue, London, E20 1HZ
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 30 June (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 June 2025
- Last confirmation statement
- 15 January 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.
- Storey Plumbing and Heating Services Ltd2023
- Strata Flow Limited2024
- Strata HVAC Ltd2024
- Strata Mechanical Engineering Ltd.2016
- Stream Guard Ltd2025
- Studio H2O Ltd2025
- Subs Plumbing & Heating Limited2010
- Summit Hiu Heating and Repair Services Ltd2025
All plumbing and heating companies in London · All trades in London · Plumbers and heating engineers across the UK
Frequently asked questions
When are Stonemark Engineering Limited's accounts due?
Stonemark Engineering Limited's next accounts are due at Companies House by 31 March 2027 (in 170 days), covering the period to 30 June 2026.
When is Stonemark Engineering Limited's CT600 due?
The CT600 for the period to 30 June 2026 is due at HMRC by 30 June 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 April 2027.
Is Stonemark Engineering Limited still trading?
Stonemark Engineering 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 Stonemark Engineering Limited do?
Stonemark Engineering Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Stonemark Engineering Limited?
Stonemark Engineering Limited was incorporated on 15 January 1996, 30 years ago.
What is the penalty if Stonemark Engineering 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 Stonemark Engineering 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.