- Company number
- 06501695
- Incorporated
- 12 Feb 200818 years trading
- Registered office
- 21 Gold Tops, Newport, NP20 4PG
- Nature of business
- Construction of commercial buildings
Duffy Tunnelling (South Wales) Limited is a 18-year-old private limited company registered in Newport, company number 06501695, one of 204 building contractors in Newport. Its next accounts are due at Companies House on 31 March 2027, and the CT600 for the period to 30 June 2026 is due at HMRC on 30 June 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 £161K on the year before, to £173K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- 3 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 Jun 2025 | £173K | £135K | 3 | ||
| 30 Jun 2024 | £12K | £0 | £72K | £82K | 3 |
| 30 Jun 2023 | £4,243 | £68K | £71K | £91K | 3 |
| 30 Jun 2022 | £17K | £102K | £106K | £111K | 3 |
| 30 Jun 2021 | £4,199 | £51K | £112K | £157K | 4 |
| 30 Jun 2020 | £62K | £90K | £118K | £75K | 4 |
| 28 Feb 2019 | £135K | £101K | £194K | £75K | |
| 28 Feb 2018 | £61K | £76K | £92K | £50K | |
| 28 Feb 2017 | £1,685 | £0 | £11K | £26K | 2 |
| 28 Feb 2016 | £22K | £8,128 | £28K | £24K |
Where Duffy Tunnelling (South Wales) Limited is registered
The registered office is in Newport (NP20), in the Newport local authority area, Wales. Show NP20 4PG on a map.
Other trade companies in NP20
- TJ'S Recovery LtdMechanics and garages
- Fiesta Consultants LimitedFacilities management
- Phones and Tech Repairs LtdRepair services
- Micy Developments LtdProperty developers
- James Bros Plumbing & Electrical LtdPlumbers and heating engineers
- Ama Facilities Management LtdSpecialist contractors
- New Visual-Installations LtdInstallers
- James & Co Flooring Solutions LimitedFloor and wall tilers
Shared registered office
42 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 Duffy Tunnelling (South Wales) 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 March 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Apr 2027 to 30 Apr 2027 | £150 |
| 1 to 3 months late | 1 May 2027 to 30 Jun 2027 | £375 |
| 3 to 6 months late | 1 Jul 2027 to 30 Sep 2027 | £750 |
| More than 6 months late | From 1 Oct 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jul 2027 | £200 |
| 3 months late | 30 Sep 2027 | another £200 |
| 6 months late | 30 Dec 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Jun 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
- 06501695
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 12 February 2008 (18 years ago)
- Registered office
- 21 Gold Tops, Newport, NP20 4PG
- Nature of business
- Construction of commercial buildings (SIC 41201)
- Year end
- 30 June (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 June 2025
- Last confirmation statement
- 12 February 2026
- Previous names
- Duffy & Tunnelling (South Wales) Limited (until 13 May 2008)
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 Newport
Other active building contractors registered in Newport.
- East Wiltshire Builders Limited2019
- Eco Build Property Solutions Limited2017
- Eduard MGM Group Ltd2025
- Elite Windows and Building Solutions Ltd2018
- Eto Contracting Limited2015
- Evan Jones & Associates Ltd2026
- Falshaw Homes Limited2012
- Fce (Wales) Ltd2007
All building contractors in Newport · All trades in Newport · Builders across the UK
Frequently asked questions
When are Duffy Tunnelling (South Wales) Limited's accounts due?
Duffy Tunnelling (South Wales) Limited's next accounts are due at Companies House by 31 March 2027 (in 169 days), covering the period to 30 June 2026.
When is Duffy Tunnelling (South Wales) Limited's CT600 due?
The CT600 for the period to 30 June 2026 is due at HMRC by 30 June 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 April 2027.
Is Duffy Tunnelling (South Wales) Limited still trading?
Duffy Tunnelling (South Wales) 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 Duffy Tunnelling (South Wales) Limited do?
Duffy Tunnelling (South Wales) Limited is registered under Construction of commercial buildings (SIC 41201).
How old is Duffy Tunnelling (South Wales) Limited?
Duffy Tunnelling (South Wales) Limited was incorporated on 12 February 2008, 18 years ago.
What is the penalty if Duffy Tunnelling (South Wales) 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 Duffy Tunnelling (South Wales) 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.