- Companies
- Specialist contractors
- London
- Miron Energy Efficiency Ltd
Miron Energy Efficiency Ltd
- Company number
- 09804795
- Incorporated
- 1 Oct 201511 years trading
- Registered office
- 167-169 Great Portland Street, London, W1W 5PF
- Nature of business
- Other specialised construction activities n.e.c.
Miron Energy Efficiency Ltd is a 11-year-old private limited company registered in London, company number 09804795, one of 4,318 specialist construction companies in London. Its next accounts are due at Companies House on 31 October 2026, and its first CT600 is due at HMRC on 31 October 2026.
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 £21K (+9.5%) on the year before, to £244K.
- Net assets rose in 7 of 8 year-on-year comparisons on record.
- Current assets of £575K against £311K owed within a year: 1.8 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 9 years, 2016 to 2024.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Oct 2024 | £244K | £575K | £311K | 2 | |
| 31 Oct 2023 | £223K | £526K | £269K | 2 | |
| 31 Oct 2022 | £123K | £273K | £104K | 0 | |
| 31 Oct 2021 | £69K | £212K | £116K | 0 | |
| 31 Oct 2020 | £41K | £111K | £48K | 1 | |
| 31 Oct 2019 | £14K | £40K | £40K | £63K | |
| 31 Oct 2018 | £40K | £11K | £30K | ||
| 31 Oct 2017 | £18K | £48K | £29K | ||
| 31 Oct 2016 | £2,120 | £3,429 | £8,047 | £5,927 |
Who runs and owns Miron Energy Efficiency Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (2)
| Name | Role | Appointed |
|---|---|---|
| M*** D*** | Director | Oct 2015 |
| A*** M*** | Director | Jun 2020 |
People with significant control (2)
Where Miron Energy Efficiency Ltd is registered
The registered office is in London (W1W), in the Westminster local authority area, London. Show W1W 5PF 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
1,494 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 Miron Energy Efficiency 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 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Nov 2026 to 30 Nov 2026 | £150 |
| 1 to 3 months late | 1 Dec 2026 to 31 Jan 2027 | £375 |
| 3 to 6 months late | 1 Feb 2027 to 30 Apr 2027 | £750 |
| More than 6 months late | From 1 May 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2027 | £200 |
| 3 months late | 30 Apr 2027 | another £200 |
| 6 months late | 31 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- 09804795
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 1 October 2015 (11 years ago)
- Registered office
- 167-169 Great Portland Street, London, W1W 5PF
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 October (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 October 2024
- Last confirmation statement
- 8 July 2026
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in London
Other active specialist construction companies registered in London.
- Mironik Ltd2015
- Mitchell’S Contractors Limited2018
- MJ Site Solution Ltd2020
- MJC Interior Ltd2011
- Mjgroup&Sons Ltd2021
- MJJ Projects Limited2013
- MJW Surveying Ltd2009
- MK Gowers Limited2018
All specialist construction companies in London · All trades in London · Specialist contractors across the UK
Frequently asked questions
When are Miron Energy Efficiency Ltd's accounts due?
Miron Energy Efficiency Ltd's next accounts are due at Companies House by 31 October 2026 (in 18 days), covering the period to 31 January 2026.
When is Miron Energy Efficiency 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 31 October 2025, due by 31 October 2026, and one for the period to 31 January 2026, due by 31 January 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Miron Energy Efficiency Ltd still trading?
Miron Energy Efficiency 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 Miron Energy Efficiency Ltd do?
Miron Energy Efficiency Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Miron Energy Efficiency Ltd?
Miron Energy Efficiency Ltd was incorporated on 1 October 2015, 11 years ago.
Who runs Miron Energy Efficiency Ltd?
Miron Energy Efficiency Ltd has 2 active directors, the longest-serving appointed in Oct 2015. Their names and service addresses are on the Companies House register.
Who owns Miron Energy Efficiency Ltd?
2 people or companies have significant control of Miron Energy Efficiency Ltd: an individual (owns 25% to 50% of the shares); an individual (owns 25% to 50% of the shares).
What is the penalty if Miron Energy Efficiency 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 Miron Energy Efficiency 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.