- Companies
- Electricians
- Reading
- 12Sides Energy Limited
12Sides Energy Limited
- Company number
- 15408550
- Incorporated
- 12 Jan 20242 years trading
- Registered office
- 11 Dunluce Gardens, Pangbourne, Reading, RG8 7LA
- Nature of business
- Electrical installation; Plumbing, heat and air-conditioning installation; Information technology consultancy activities; Environmental consulting activities
12Sides Energy Limited is a 2-year-old private limited company registered in Reading, company number 15408550, one of 176 electrical contractors in Reading. Its next accounts are due at Companies House on 31 October 2026, and the CT600 for the period to 31 January 2026 is due at HMRC on 31 January 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Where 12Sides Energy Limited is registered
The registered office is in Reading (RG8), in the West Berkshire local authority area, South East. Show RG8 7LA on a map.
Other trade companies in RG8
- Whitman Building Services Residential LtdBuilders
- Pangbourne Vehicle Services LtdMechanics and garages
- DP Gate Solutions LimitedFinishing trades
- Avents Paddock LtdProperty developers
- B&H Builds LtdProperty developers
- Eastfield Contracts LimitedInstallers
- Fernhill Property Group LimitedBuilders
- Get Knotted LimitedSpecialist contractors
What happens if 12Sides 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 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
- 15408550
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 12 January 2024 (2 years ago)
- Registered office
- 11 Dunluce Gardens, Pangbourne, Reading, RG8 7LA
- Nature of business
- Electrical installation (SIC 43210)
Plumbing, heat and air-conditioning installation (SIC 43220)
Information technology consultancy activities (SIC 62020)
Environmental consulting activities (SIC 74901) - Year end
- 31 January (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 January 2025
- Last confirmation statement
- 21 September 2026
- Previous names
- 12Sides Consultancy Limited (until 21 Sep 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 Reading
Other active electrical contractors registered in Reading.
- 3D Services Limited2015
- Ahl Electrical Ltd2007
- Ak Electrician Building Service Ltd2024
- Aka Security Solutions Limited2025
- Al Saleh Services Limited2023
- Alans Electrical Services Reading Ltd2017
- Alex Igov Services Ltd2019
- Alm Electrical Services Limited2021
All electrical contractors in Reading · All trades in Reading · Electricians across the UK
Frequently asked questions
When are 12Sides Energy Limited's accounts due?
12Sides Energy Limited's next accounts are due at Companies House by 31 October 2026 (in 18 days), covering the period to 31 January 2026.
When is 12Sides Energy Limited's CT600 due?
The CT600 for the period to 31 January 2026 is due at HMRC by 31 January 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 November 2026.
Is 12Sides Energy Limited still trading?
12Sides 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 12Sides Energy Limited do?
12Sides Energy Limited is registered under Electrical installation (SIC 43210); Plumbing, heat and air-conditioning installation (SIC 43220); Information technology consultancy activities (SIC 62020); Environmental consulting activities (SIC 74901).
How old is 12Sides Energy Limited?
12Sides Energy Limited was incorporated on 12 January 2024, 2 years ago.
What is the penalty if 12Sides 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 12Sides 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.