- Companies
- Civil engineering
- Belfast
- Tonnagh Beg Group Ltd
Tonnagh Beg Group Ltd
- Company number
- NI642067
- Incorporated
- 10 Nov 20169 years trading
- Registered office
- 17 Clarendon Road, Clarendon Dock, Belfast, BT1 3BG
- Nature of business
- Construction of roads and motorways; Construction of railways and underground railways; Construction of other civil engineering projects n.e.c.; Site preparation
Tonnagh Beg Group Ltd is a 9-year-old private limited company registered in Belfast, company number NI642067, one of 67 civil engineering contractors in Belfast. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 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 £67K (+58.8%) on the year before, to £181K.
- Net assets rose in 4 of 7 year-on-year comparisons on record.
- Current assets of £499K against £873K owed within a year: 0.6 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 8 years, 2018 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £181K | £9,899 | £499K | £873K | 0 |
| 31 Mar 2024 | £114K | £9,110 | £461K | £902K | 0 |
| 31 Mar 2023 | £171K | £30K | £539K | £664K | 0 |
| 31 Mar 2022 | £384K | £8,692 | £458K | £370K | 0 |
| 31 Mar 2021 | £357K | £34K | £454K | £394K | 0 |
| 31 Mar 2020 | £335K | £10K | £422K | £384K | 0 |
| 31 Mar 2019 | £784K | £1,833 | £627K | £138K | |
| 31 Mar 2018 | £8,679 | £294K |
Where Tonnagh Beg Group Ltd is registered
The registered office is in Belfast (BT1), in the Belfast local authority area, Northern Ireland. Show BT1 3BG on a map.
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Also registered at this address
19 other companies use the same registered office as Tonnagh Beg Group Ltd.
- Ballystrew Properties LtdProperty developers
- Bastide Ventures LtdProperty developers
- Camana Consulting LimitedSpecialist contractors
- D. & D. Flooring LimitedFloor and wall tilers
- Dof Developments LtdProperty developers
- Grass Machinery NI LimitedMachinery repair and installation
- Haley Vehicle Movements LtdMotor traders
- Indevair LtdPlumbers and heating engineers
- K Contracts LimitedMachinery repair and installation
- Larne Coachworks LimitedMechanics and garages
- Lofty Property Investments LtdProperty developers
- M H Motors LimitedMotor traders
- Razorback Properties LtdProperty developers
- Ringsend LimitedProperty developers
- Six-West LtdFinishing trades
- Sona Homes LtdProperty developers
- Sunswift Enterprises LimitedProperty developers
- Thornleigh D LtdBuilders
- TMR Electrical LimitedElectricians
What happens if Tonnagh Beg Group 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
- NI642067
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 November 2016 (9 years ago)
- Registered office
- 17 Clarendon Road, Clarendon Dock, Belfast, BT1 3BG
- Nature of business
- Construction of roads and motorways (SIC 42110)
Construction of railways and underground railways (SIC 42120)
Construction of other civil engineering projects n.e.c. (SIC 42990)
Site preparation (SIC 43120) - Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 21 June 2026
- Charges (mortgages)
- 0 outstanding of 3 registered
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 Belfast
Other active civil engineering contractors registered in Belfast.
- Wee Bit Services Ltd2026
- Weev.Ie Holdco Limited2022
- Arro Contracts Ltd2026
- Ballure Co Ltd2012
- Ballure Wind Co Ltd2012
- Ben Madigan Construction Ltd2019
- Blackburnhydro Limited2016
- Cable Landfall Support Limited2020
All civil engineering contractors in Belfast · All trades in Belfast · Civil engineering across the UK
Frequently asked questions
When are Tonnagh Beg Group Ltd's accounts due?
Tonnagh Beg Group 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 Tonnagh Beg Group Ltd's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is Tonnagh Beg Group Ltd still trading?
Tonnagh Beg Group 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 Tonnagh Beg Group Ltd do?
Tonnagh Beg Group Ltd is registered under Construction of roads and motorways (SIC 42110); Construction of railways and underground railways (SIC 42120); Construction of other civil engineering projects n.e.c. (SIC 42990); Site preparation (SIC 43120).
How old is Tonnagh Beg Group Ltd?
Tonnagh Beg Group Ltd was incorporated on 10 November 2016, 9 years ago.
What is the penalty if Tonnagh Beg Group 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 Tonnagh Beg Group 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.