- Companies
- Plumbers and heating engineers
- Swansea
- GSW & Son Limited
GSW & Son Limited
- Company number
- 16310702
- Incorporated
- 12 Mar 20251 year trading
- Registered office
- GCNG House Unit 12, Tawe Business Village, Swansea Enterprise Park, Swansea, SA7 9LA
- Nature of business
- Plumbing, heat and air-conditioning installation
GSW & Son Limited is a 1-year-old private limited company registered in Swansea, company number 16310702, one of 148 plumbing and heating companies in Swansea. Its next accounts are due at Companies House on 12 December 2026, and its first CT600 is due at HMRC on 11 March 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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Who runs and owns GSW & Son Limited
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officer
| Name | Role | Appointed |
|---|---|---|
| G*** W*** | Director | Mar 2025 |
Person with significant control
Where GSW & Son Limited is registered
The registered office is in Swansea (SA7), in the Swansea local authority area, Wales. Show SA7 9LA on a map.
Other trade companies in SA7
- Foundry & Co Construction LtdBuilders
- Pops Power Solutions LtdElectricians
- Perfect Roofing and Home Maintenance LimitedRoofers
- Eveo Engineering LtdElectricians
- Performance Bunker Liner LimitedSpecialist contractors
- Swan Roofing LimitedRoofers
- Air Conditioning & Heat Pumps LimitedPlumbers and heating engineers
- Ogm Pristine Cleaning LtdCleaning companies
Also registered at this address
17 other companies use the same registered office as GSW & Son Limited.
- A.G.A.A Investments LtdProperty developers
- Cynnydd Group LimitedProperty developers
- DM Carpet Clean LtdCleaning companies
- Electrical & Renewable Installations LimitedElectricians
- Fad Fragrances LimitedProperty developers
- G&B Property Investments LtdProperty developers
- Goddard Auto Repairs LimitedMechanics and garages
- Gre Electrical Services LimitedElectricians
- Ivd Heating LtdPlumbers and heating engineers
- John Mitchell Electrical Solutions LimitedElectricians
- Jon Ball Plastering & Renovations LtdBuilders
- Lace Auto Centre LimitedMechanics and garages
- Regimental Cleaning Services LtdCleaning companies
- Scott Burrows Company LimitedProperty developers
- Sowden Agri LimitedElectricians
- Truck Plant Agri LimitedMachinery repair and installation
- Tube Access Scaffolding LtdScaffolders
What happens if GSW & Son 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 12 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 13 Dec 2026 to 12 Jan 2027 | £150 |
| 1 to 3 months late | 13 Jan 2027 to 12 Mar 2027 | £375 |
| 3 to 6 months late | 13 Mar 2027 to 12 Jun 2027 | £750 |
| More than 6 months late | From 13 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 16310702
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 12 March 2025 (1 year ago)
- Registered office
- GCNG House Unit 12, Tawe Business Village, Swansea Enterprise Park, Swansea, SA7 9LA
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 March (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 11 March 2026
Filing notes for plumbing and heating companies
Plumbing and heating companies frequently work under CIS for main contractors and also directly for homeowners, so turnover can mix CIS and non-CIS income.
Similar companies in Swansea
Other active plumbing and heating companies registered in Swansea.
- Hale Heating and Plumbing Ltd2020
- Hale Heating and Renewables Ltd2025
- Harry's Heating & Plumbing Ltd2023
- Heat Pump Services Ltd2009
- Heaterup Ltd2024
- Heatsource (Wales) Limited2012
- Helix Plumbing and Gas Limited2023
- Hendre Gas Services Ltd2021
All plumbing and heating companies in Swansea · All trades in Swansea · Plumbers and heating engineers across the UK
Frequently asked questions
When are GSW & Son Limited's accounts due?
GSW & Son Limited's next accounts are due at Companies House by 12 December 2026 (in 60 days), covering the period to 31 March 2026.
When is GSW & Son 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 11 March 2026, due by 11 March 2027, and one for the period to 31 March 2026, due by 31 March 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is GSW & Son Limited still trading?
GSW & Son 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 GSW & Son Limited do?
GSW & Son Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is GSW & Son Limited?
GSW & Son Limited was incorporated on 12 March 2025, 1 year ago.
Who runs GSW & Son Limited?
GSW & Son Limited has 1 active director, the longest-serving appointed in Mar 2025. Their names and service addresses are on the Companies House register.
Who owns GSW & Son Limited?
One person or company has significant control of GSW & Son Limited: an individual (owns 75% or more of the shares).
What is the penalty if GSW & Son 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 GSW & Son 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.