- Companies
- Builders
- Carmarthen
- B.J. Thomas & Son Limited
B.J. Thomas & Son Limited
- Company number
- 04560298
- Incorporated
- 11 Oct 200224 years trading
- Registered office
- Plas Newydd, Nantycaws, Carmarthen, SA32 8ES
- Nature of business
- Construction of domestic buildings; Construction of utility projects for electricity and telecommunications; Construction of other civil engineering projects n.e.c.; Other building completion and finishing
B.J. Thomas & Son Limited is a 24-year-old private limited company registered in Carmarthen, company number 04560298, one of 50 building contractors in Carmarthen. Its next accounts are due at Companies House on 31 July 2027, and the CT600 for the period to 31 October 2026 is due at HMRC on 31 October 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Public contracts won
B.J. Thomas & Son Limited has one public sector contract award on record (2026). Source: Contracts Finder and Find a Tender award notices. For all of them the published figure is a shared or multi-year ceiling (a framework place, a multi-supplier award, or more than a small company could hold alone), so no value is shown.
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Affinity Water Limited | UVDB Powered by Achilles QUDM for Goods, Works and Services | Ceiling, not shown | 19 Aug 2026 |
Where B.J. Thomas & Son Limited is registered
The registered office is in Carmarthen (SA32), in the Carmarthenshire local authority area, Wales. Show SA32 8ES on a map.
Other trade companies in SA32
- Cen Coed LimitedJoiners and carpenters
- C&A Concrete Pumping Ltd LtdBuilders
- CJW Access LtdCivil engineering
- Mitchell's Plumbing LtdPlumbers and heating engineers
- 360 Electrical Solutions (Wales) LtdElectricians
- LJC Property Developments LtdProperty developers
- Arcs and Sparks LimitedMachinery repair and installation
- Wolf Works LtdFacilities management
What happens if B.J. Thomas & 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 31 July 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Aug 2027 to 31 Aug 2027 | £150 |
| 1 to 3 months late | 1 Sep 2027 to 31 Oct 2027 | £375 |
| 3 to 6 months late | 1 Nov 2027 to 31 Jan 2028 | £750 |
| More than 6 months late | From 1 Feb 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Nov 2027 | £200 |
| 3 months late | 31 Jan 2028 | another £200 |
| 6 months late | 30 Apr 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Oct 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
- 04560298
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 11 October 2002 (24 years ago)
- Registered office
- Plas Newydd, Nantycaws, Carmarthen, SA32 8ES
- Nature of business
- Construction of domestic buildings (SIC 41202)
Construction of utility projects for electricity and telecommunications (SIC 42220)
Construction of other civil engineering projects n.e.c. (SIC 42990)
Other building completion and finishing (SIC 43390) - Year end
- 31 October (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 October 2025
- Last confirmation statement
- 11 October 2025
- Charges (mortgages)
- 0 outstanding of 2 registered
Filing notes for building contractors
Building companies often run the Construction Industry Scheme as a contractor, a subcontractor or both. CIS deductions suffered during the year are set against the PAYE bill, and any unrecovered balance at the year end matters when the accounts are drawn up.
Similar companies in Carmarthen
Other active building contractors registered in Carmarthen.
- Blue Slate Property Ltd2026
- Bryncyrnau Limited2015
- City Developments (Swansea) Limited2005
- Clews Homes Limited1998
- Drindod Properties Ltd2015
- Gwili Developments Limited2007
- Gwyn Lewis Building Services Limited2010
- HH Plumbing Services Limited2014
All building contractors in Carmarthen · All trades in Carmarthen · Builders across the UK
Frequently asked questions
When are B.J. Thomas & Son Limited's accounts due?
B.J. Thomas & Son Limited's next accounts are due at Companies House by 31 July 2027 (in 291 days), covering the period to 31 October 2026.
When is B.J. Thomas & Son Limited's CT600 due?
The CT600 for the period to 31 October 2026 is due at HMRC by 31 October 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 August 2027.
Is B.J. Thomas & Son Limited still trading?
B.J. Thomas & 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 B.J. Thomas & Son Limited do?
B.J. Thomas & Son Limited is registered under Construction of domestic buildings (SIC 41202); Construction of utility projects for electricity and telecommunications (SIC 42220); Construction of other civil engineering projects n.e.c. (SIC 42990); Other building completion and finishing (SIC 43390).
How old is B.J. Thomas & Son Limited?
B.J. Thomas & Son Limited was incorporated on 11 October 2002, 24 years ago.
Has B.J. Thomas & Son Limited won public sector contracts?
Yes. B.J. Thomas & Son Limited has one contract award from public bodies on Contracts Finder and Find a Tender, most recently from AFFINITY WATER LIMITED.
What is the penalty if B.J. Thomas & 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 B.J. Thomas & 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.