- Companies
- Electricians
- Swansea
- Three Phase Ltd
Three Phase Ltd
- Company number
- 17071062
- Incorporated
- 4 Mar 2026
- Registered office
- 21 Gower Road, Sketty, Swansea, SA2 9BX
- Nature of business
- Electrical installation
Three Phase Ltd is a newly incorporated private limited company registered in Swansea, company number 17071062, one of 148 electrical contractors in Swansea. Its next accounts are due at Companies House on 4 December 2027, and its first CT600 is due at HMRC on 3 March 2028.
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.
Is this your company?
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Where Three Phase Ltd is registered
The registered office is in Swansea (SA2), in the Swansea local authority area, Wales. Show SA2 9BX on a map.
Other trade companies in SA2
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- DC Plumbing & Construction LtdBuilders
- Ginger Property Services LimitedProperty developers
- Smart Space Living LtdJoiners and carpenters
- Paul Vernon HV Sap LimitedCivil engineering
- L.H Hiab & Recovery LimitedMechanics and garages
- Lewis Tarmac LtdCivil engineering
- Tolzini Cleaning Services LtdCleaning companies
Also registered at this address
12 other companies use the same registered office as Three Phase Ltd.
- Atb Contractors LtdElectricians
- Coates Developments LimitedFinishing trades
- Craftsmen Elite LtdFinishing trades
- Everest Mechanical Services LimitedPlumbers and heating engineers
- F2H Fitting LimitedFloor and wall tilers
- Haus Classics LtdMotor traders
- Herms Construction LimitedProperty developers
- LWRS LtdFinishing trades
- Roben Property Developments LtdFinishing trades
- Serv&Co LtdMechanics and garages
- TJ Rated Services LtdCleaning companies
- TR Scaffolding LtdScaffolders
What happens if Three Phase 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 4 December 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 5 Dec 2027 to 4 Jan 2028 | £150 |
| 1 to 3 months late | 5 Jan 2028 to 4 Mar 2028 | £375 |
| 3 to 6 months late | 5 Mar 2028 to 4 Jun 2028 | £750 |
| More than 6 months late | From 5 Jun 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 2029 | 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
- 17071062
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 4 March 2026
- Registered office
- 21 Gower Road, Sketty, Swansea, SA2 9BX
- Nature of business
- Electrical installation (SIC 43210)
- Year end
- 31 March (accounting reference date)
- Accounts type
- No accounts filed yet
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 Swansea
Other active electrical contractors registered in Swansea.
- Tidal Develop and Construct Ltd2026
- TPN Electrical Engineers Limited2004
- Tri-Energy Ltd2026
- Truecore Electrics Ltd2025
- Trydan Engineering Ltd2024
- Ulex Energy Ltd2025
- Wave Energy Ltd2026
- Williams Electrical SW Ltd2023
All electrical contractors in Swansea · All trades in Swansea · Electricians across the UK
Frequently asked questions
When are Three Phase Ltd's accounts due?
Three Phase Ltd's next accounts are due at Companies House by 4 December 2027 (in 418 days), covering the period to 31 March 2027.
When is Three Phase 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 3 March 2027, due by 3 March 2028, and one for the period to 31 March 2027, due by 31 March 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Three Phase Ltd still trading?
Three Phase 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 Three Phase Ltd do?
Three Phase Ltd is registered under Electrical installation (SIC 43210).
How old is Three Phase Ltd?
Three Phase Ltd was incorporated on 4 March 2026, less than a year ago.
What is the penalty if Three Phase 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 Three Phase 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.