- Companies
- Electricians
- Portsmouth
- Conlex Electrical Services Limited
Conlex Electrical Services Limited
- Company number
- 16390357
- Incorporated
- 15 Apr 20251 year trading
- Registered office
- 5 Ruskin Road, Portsmouth, Hampshire, PO4 8RQ
- Nature of business
- Electrical installation
Conlex Electrical Services Limited is a 1-year-old private limited company registered in Portsmouth, company number 16390357, one of 148 electrical contractors in Portsmouth. Its next accounts are due at Companies House on 15 January 2027, and its first CT600 is due at HMRC on 14 April 2027.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
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Where Conlex Electrical Services Limited is registered
The registered office is in Portsmouth (PO4), in the Portsmouth local authority area, South East. Show PO4 8RQ on a map.
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- Elite Building Services (Portsmouth) LtdBuilders
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Also registered at this address
1 other company uses the same registered office as Conlex Electrical Services Limited.
- Solarco Energy LtdInstallers
What happens if Conlex Electrical Services 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 15 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 16 Jan 2027 to 15 Feb 2027 | £150 |
| 1 to 3 months late | 16 Feb 2027 to 15 Apr 2027 | £375 |
| 3 to 6 months late | 16 Apr 2027 to 15 Jul 2027 | £750 |
| More than 6 months late | From 16 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2027 | £200 |
| 3 months late | 31 Aug 2027 | another £200 |
| 6 months late | 30 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 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
- 16390357
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 15 April 2025 (1 year ago)
- Registered office
- 5 Ruskin Road, Portsmouth, Hampshire, PO4 8RQ
- Nature of business
- Electrical installation (SIC 43210)
- Year end
- 31 May (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 14 April 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 Portsmouth
Other active electrical contractors registered in Portsmouth.
- Crescent Power Ltd2017
- CSL Electrical (Southern) Ltd2015
- D Squared Electrical Services Ltd2013
- Darvill Ltd2024
- DCJ Electrical Ltd2025
- Design Electric Ltd2000
- Detection Fire & Security Ltd2021
- Diverse Contracting Ltd2014
All electrical contractors in Portsmouth · All trades in Portsmouth · Electricians across the UK
Frequently asked questions
When are Conlex Electrical Services Limited's accounts due?
Conlex Electrical Services Limited's next accounts are due at Companies House by 15 January 2027 (in 95 days), covering the period to 31 May 2026.
When is Conlex Electrical Services Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 14 April 2026, due by 14 April 2027, and one for the period to 31 May 2026, due by 31 May 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Conlex Electrical Services Limited still trading?
Conlex Electrical Services 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 Conlex Electrical Services Limited do?
Conlex Electrical Services Limited is registered under Electrical installation (SIC 43210).
How old is Conlex Electrical Services Limited?
Conlex Electrical Services Limited was incorporated on 15 April 2025, 1 year ago.
What is the penalty if Conlex Electrical Services 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 Conlex Electrical Services 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.