- Companies
- Civil engineering
- Cardiff
- Thortech International Ltd
Thortech International Ltd
- Company number
- 14969392
- Incorporated
- 29 Jun 20233 years trading
- Registered office
- Oceanus Suite Marine Village, Penarth Road, Cardiff, South Glamorgan, CF11 8TU
- Nature of business
- Construction of other civil engineering projects n.e.c.
Thortech International Ltd is a 3-year-old private limited company registered in Cardiff, company number 14969392, one of 89 civil engineering contractors in Cardiff. Its next accounts are due at Companies House on 31 December 2026, and its first CT600 is due at HMRC on 31 December 2026.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets up £7,361 (+61.7%) on the year before, to £19K.
- Current assets of £100K against £120K owed within a year: 0.8 times cover.
- 6 employees on average, down from 8 the year before.
- Balance sheets on record for 2 years, 2023 to 2024.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2024 | £19K | £2,871 | £100K | £120K | 6 |
| 31 Dec 2023 | £12K | £6,121 | £23K | £42K | 8 |
Where Thortech International Ltd is registered
The registered office is in Cardiff (CF11), in the Cardiff local authority area, Wales. Show CF11 8TU on a map.
Other trade companies in CF11
- DRK Car Sales LimitedMotor traders
- Daily Catering Repairs LtdMachinery repair and installation
- R S Tyres LtdMotor traders
- Cronyx Solutions LimitedBuilders
- Ali Construction Services UK LtdBuilders
- Crown Damp Proofing LtdSpecialist contractors
- Time for You Cardiff LtdCleaning companies
- Logistfix LtdRepair services
What happens if Thortech International 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 31 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 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
- 14969392
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 29 June 2023 (3 years ago)
- Registered office
- Oceanus Suite Marine Village, Penarth Road, Cardiff, South Glamorgan, CF11 8TU
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 December (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 December 2024
- Last confirmation statement
- 28 June 2026
- Previous names
- Darrmarc Ltd (until 29 Sep 2023)
Filing notes for civil engineering contractors
Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.
Similar companies in Cardiff
Other active civil engineering contractors registered in Cardiff.
- To Solutions Ltd2026
- Trojan Fibre Service Ltd2023
- Trusthouse Construction Limited2001
- Ukff Solutions Ltd2005
- Velox Communications Ltd2021
- Viking Civil Engineering Ltd2017
- W Driscoll Engineering Ltd2025
- Wasteremove Limited1999
All civil engineering contractors in Cardiff · All trades in Cardiff · Civil engineering across the UK
Frequently asked questions
When are Thortech International Ltd's accounts due?
Thortech International Ltd's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is Thortech International 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 31 December 2025, due by 31 December 2026, 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 Thortech International Ltd still trading?
Thortech International 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 Thortech International Ltd do?
Thortech International Ltd is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is Thortech International Ltd?
Thortech International Ltd was incorporated on 29 June 2023, 3 years ago.
What is the penalty if Thortech International 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 Thortech International 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.