- Companies
- Electricians
- Cardiff
- Iolo Energy Limited
Iolo Energy Limited
- Company number
- 12666771
- Incorporated
- 12 Jun 20206 years trading
- Registered office
- Hodge House 5TH Floor, ST. Mary Street, Cardiff, CF10 1DY
- Nature of business
- Electrical installation
Iolo Energy Limited is a 6-year-old private limited company registered in Cardiff, company number 12666771, one of 223 electrical contractors in Cardiff. 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 down £859 (-32.4%) on the year before, to -£3,509.
- Net assets rose in 0 of 4 year-on-year comparisons on record.
- Current assets of £100 against £769K owed within a year: 0.0 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 5 years, 2021 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Jun 2025 | -£3,509 | £100 | £100 | £769K | 1 |
| 30 Jun 2024 | -£2,650 | £100 | £313K | 1 | |
| 30 Jun 2023 | -£1,900 | £100 | £273K | 1 | |
| 30 Jun 2022 | -£1,120 | £100 | £162K | 1 | |
| 30 Jun 2021 | -£380 | £100 | £63K | 0 |
Where Iolo Energy Limited is registered
The registered office is in Cardiff (CF10), in the Cardiff local authority area, Wales. Show CF10 1DY on a map.
Other trade companies in CF10
- Hudcon LtdBuilders
- Skyline Pitched and Flat Roofing LtdRoofers
- Eclipse Construction Group LtdPlasterers
- DWR Plumbing LtdPlumbers and heating engineers
- CF Glazing LtdGlaziers
- Regency Construction Group LtdProperty developers
- Qproperty Solutions LimitedFinishing trades
- Express Vehicle Services (Cardiff) LimitedMechanics and garages
What happens if Iolo Energy 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
- 12666771
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 12 June 2020 (6 years ago)
- Registered office
- Hodge House 5TH Floor, ST. Mary Street, Cardiff, CF10 1DY
- Nature of business
- Electrical installation (SIC 43210)
- Year end
- 30 June (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 June 2025
- Last confirmation statement
- 28 January 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 Cardiff
Other active electrical contractors registered in Cardiff.
- J. Rees Electrical Ltd2021
- J.C. Building and Electrical Services Limited2002
- Je Electrical Solutions Ltd2026
- Jenlec Limited2019
- JK Electrical Group Ltd2024
- Joff Cox Ltd2016
- Johnson's Facilities Management Ltd2023
- JRC Electrical Contract Services Limited2020
All electrical contractors in Cardiff · All trades in Cardiff · Electricians across the UK
Frequently asked questions
When are Iolo Energy Limited's accounts due?
Iolo Energy Limited's next accounts are due at Companies House by 31 March 2027 (in 169 days), covering the period to 30 June 2026.
When is Iolo Energy 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 Iolo Energy Limited still trading?
Iolo Energy 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 Iolo Energy Limited do?
Iolo Energy Limited is registered under Electrical installation (SIC 43210).
How old is Iolo Energy Limited?
Iolo Energy Limited was incorporated on 12 June 2020, 6 years ago.
What is the penalty if Iolo Energy 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 Iolo Energy 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.