- Companies
- Civil engineering
- Exmouth
- Tonkin Materials Testing Limited
Tonkin Materials Testing Limited
- Company number
- 05928014
- Incorporated
- 7 Sep 200620 years trading
- Registered office
- 28 Alexandra Terrace, Exmouth, Devon, EX8 1BD
- Nature of business
- Construction of roads and motorways
Tonkin Materials Testing Limited is a 20-year-old private limited company registered in Exmouth, company number 05928014, one of the UK's civil engineering contractors. Its next accounts are due at Companies House on 30 June 2027, and the CT600 for the period to 30 September 2026 is due at HMRC on 30 September 2027.
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 £179K (+39%) on the year before, to £638K.
- Net assets rose in 8 of 9 year-on-year comparisons on record.
- Current assets of £815K against £213K owed within a year: 3.8 times cover.
- 4 employees on average during the year.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Sep 2025 | £638K | £248K | £815K | £213K | 4 |
| 30 Sep 2024 | £459K | £212K | £619K | £199K | 4 |
| 30 Sep 2023 | £443K | £185K | £564K | £143K | 4 |
| 30 Sep 2022 | £321K | £101K | £397K | £103K | 6 |
| 30 Sep 2021 | £228K | £133K | £342K | £136K | 6 |
| 30 Sep 2020 | £115K | £52K | £164K | £71K | 5 |
| 30 Sep 2019 | £197K | £42K | £325K | £151K | 4 |
| 30 Sep 2018 | £112K | £60K | £292K | £202K | 4 |
| 30 Sep 2017 | £23K | £60K | £202K | £242K | 5 |
| 30 Sep 2016 | £12K | £53K | £151K | £240K |
Where Tonkin Materials Testing Limited is registered
The registered office is in Exmouth (EX8), in the East Devon local authority area, South West. Show EX8 1BD on a map.
Other trade companies in EX8
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- MS Marine Services LtdMachinery repair and installation
- Elite Markings (SW) LtdCivil engineering
- Kendray LtdSpecialist contractors
- Squeak & Span Cleaning Company LtdCleaning companies
- NRS Facilities Maintenance LimitedMachinery repair and installation
- Loop Drive Motor LtdMotor traders
- Wheeldon Farm (SW) LtdBuilders
Shared registered office
67 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if Tonkin Materials Testing 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 30 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jul 2027 to 31 Jul 2027 | £150 |
| 1 to 3 months late | 1 Aug 2027 to 30 Sep 2027 | £375 |
| 3 to 6 months late | 1 Oct 2027 to 31 Dec 2027 | £750 |
| More than 6 months late | From 1 Jan 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2027 | £200 |
| 3 months late | 30 Dec 2027 | another £200 |
| 6 months late | 30 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 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
- 05928014
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 7 September 2006 (20 years ago)
- Registered office
- 28 Alexandra Terrace, Exmouth, Devon, EX8 1BD
- Nature of business
- Construction of roads and motorways (SIC 42110)
- Year end
- 30 September (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 7 September 2026
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 Exmouth
Other active civil engineering contractors registered in Exmouth.
All civil engineering contractors in Exmouth · All trades in Exmouth · Civil engineering across the UK
Frequently asked questions
When are Tonkin Materials Testing Limited's accounts due?
Tonkin Materials Testing Limited's next accounts are due at Companies House by 30 June 2027 (in 261 days), covering the period to 30 September 2026.
When is Tonkin Materials Testing Limited's CT600 due?
The CT600 for the period to 30 September 2026 is due at HMRC by 30 September 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 July 2027.
Is Tonkin Materials Testing Limited still trading?
Tonkin Materials Testing 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 Tonkin Materials Testing Limited do?
Tonkin Materials Testing Limited is registered under Construction of roads and motorways (SIC 42110).
How old is Tonkin Materials Testing Limited?
Tonkin Materials Testing Limited was incorporated on 7 September 2006, 20 years ago.
What is the penalty if Tonkin Materials Testing 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 Tonkin Materials Testing 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.