- Companies
- Electricians
- York
- Harmon Energy Systems Limited
Harmon Energy Systems Limited
- Company number
- 05823341
- Incorporated
- 19 May 200620 years trading
- Registered office
- Manor Barn ST. Peters Close, Brafferton, York, YO61 2NP
- Nature of business
- Electrical installation; Management consultancy activities other than financial management
Harmon Energy Systems Limited is a 20-year-old private limited company registered in York, company number 05823341, one of 144 electrical contractors in York. Its next accounts are due at Companies House on 28 February 2027, and the CT600 for the period to 29 May 2026 is due at HMRC on 29 May 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 £22K (-44.9%) on the year before, to -£70K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £7,146 against £115K owed within a year: 0.1 times cover.
- 1 employee on average during the year.
- 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 |
|---|---|---|---|---|---|
| 31 May 2025 | -£70K | £3,039 | £7,146 | £115K | 1 |
| 31 May 2024 | -£48K | £2,050 | £24K | £114K | 1 |
| 31 May 2023 | -£29K | £46K | £56K | £122K | 1 |
| 31 May 2022 | £13K | £22K | £37K | £29K | 1 |
| 31 May 2021 | £5,480 | £14K | £23K | £59K | 0 |
| 31 May 2020 | £901 | £18K | £51K | £59K | 1 |
| 31 May 2019 | £61K | £1,408 | £111K | £60K | 3 |
| 31 May 2018 | £20K | £4,615 | £27K | £21K | 3 |
| 31 May 2017 | £20K | £16K | £14K | 2 | |
| 31 May 2016 | £16K | £16K | £17K |
Who runs and owns Harmon Energy Systems Limited
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (2)
| Name | Role | Appointed |
|---|---|---|
| D*** M*** | Director | May 2006 |
| T*** M*** | Director | Jul 2025 |
2 former officers
| Name | Role | Appointed | Left |
|---|---|---|---|
| C*** S*** | Secretary | May 2006 | Jan 2020 |
| C*** S*** | Director | May 2006 | Jan 2020 |
Person with significant control
Where Harmon Energy Systems Limited is registered
The registered office is in York (YO61), in the North Yorkshire local authority area, Yorkshire and The Humber. Show YO61 2NP on a map.
Other trade companies in YO61
- Columbus House Construction LtdBuilders
- The Bicycle Clinic LimitedMachinery repair and installation
- Valley Group Y/Shire LtdRoofers
- Carbon Cars LtdMotor traders
- Bellerby Industries LtdMechanics and garages
- S Cheetham Construction LtdProperty developers
- Sightline Window Supply LtdGlaziers
- Graham Baxter Engineering LimitedMachinery repair and installation
What happens if Harmon Energy Systems 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 28 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Mar 2027 to 31 Mar 2027 | £150 |
| 1 to 3 months late | 1 Apr 2027 to 31 May 2027 | £375 |
| 3 to 6 months late | 1 Jun 2027 to 31 Aug 2027 | £750 |
| More than 6 months late | From 1 Sep 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 30 May 2027 | £200 |
| 3 months late | 29 Aug 2027 | another £200 |
| 6 months late | 29 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 29 May 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
- 05823341
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 19 May 2006 (20 years ago)
- Registered office
- Manor Barn ST. Peters Close, Brafferton, York, YO61 2NP
- Nature of business
- Electrical installation (SIC 43210)
Management consultancy activities other than financial management (SIC 70229) - Year end
- 29 May (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 19 May 2026
Filing notes for electrical contractors
Electrical contracting companies are often a director plus a van and tools. Most fall within the micro-entity rules, so the accounts filed at Companies House are short, and the CT600 carries the tax detail.
Similar companies in York
Other active electrical contractors registered in York.
- Hayward Electrical (York) Ltd2023
- HD Electrical Services Yorkshire Ltd2023
- Hill Electrical Solutions Ltd2024
- Hunter Electrical Projects and Services Limited2001
- I H Jointing Limited2018
- I Morrell Ltd2016
- Innovate Electrical York Ltd2021
- Interpower Solutions Ltd2011
All electrical contractors in York · All trades in York · Electricians across the UK
Frequently asked questions
When are Harmon Energy Systems Limited's accounts due?
Harmon Energy Systems Limited's next accounts are due at Companies House by 28 February 2027 (in 138 days), covering the period to 29 May 2026.
When is Harmon Energy Systems Limited's CT600 due?
The CT600 for the period to 29 May 2026 is due at HMRC by 29 May 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 March 2027.
Is Harmon Energy Systems Limited still trading?
Harmon Energy Systems 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 Harmon Energy Systems Limited do?
Harmon Energy Systems Limited is registered under Electrical installation (SIC 43210); Management consultancy activities other than financial management (SIC 70229).
How old is Harmon Energy Systems Limited?
Harmon Energy Systems Limited was incorporated on 19 May 2006, 20 years ago.
Who runs Harmon Energy Systems Limited?
Harmon Energy Systems Limited has 2 active directors, the longest-serving appointed in May 2006. Their names and service addresses are on the Companies House register.
Who owns Harmon Energy Systems Limited?
One person or company has significant control of Harmon Energy Systems Limited: an individual (owns 75% or more of the shares).
What is the penalty if Harmon Energy Systems 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 Harmon Energy Systems 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.