- Companies
- Mechanics and garages
- Swansea
- Diamond Alloys Swansea Limited
Diamond Alloys Swansea Limited
- Company number
- 12799073
- Incorporated
- 7 Aug 20206 years trading
- Registered office
- Avc House, 21 Northampton Lane, Swansea, SA1 4EH
- Nature of business
- Maintenance and repair of motor vehicles
Diamond Alloys Swansea Limited is a 6-year-old private limited company registered in Swansea, company number 12799073, one of 154 vehicle repair garages in Swansea. Its next accounts are due at Companies House on 30 May 2027, and the CT600 for the period to 30 August 2026 is due at HMRC on 30 August 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 £37K (+157.6%) on the year before, to £60K.
- Net assets rose in 3 of 4 year-on-year comparisons on record.
- Current assets of £126K against £174K owed within a year: 0.7 times cover.
- 4 employees on average during the year.
- Balance sheets on record for 5 years, 2021 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Aug 2025 | £60K | £126K | £174K | 4 | |
| 30 Aug 2024 | £23K | £146K | £192K | 4 | |
| 30 Aug 2023 | -£831 | £86K | £155K | 2 | |
| 30 Aug 2022 | -£21K | £41K | 2 | ||
| 31 Aug 2021 | -£20K | £24K | £99K | 1 |
Where Diamond Alloys Swansea Limited is registered
The registered office is in Swansea (SA1), in the Swansea local authority area, Wales. Show SA1 4EH on a map.
Other trade companies in SA1
- JDS Ringside Customs LtdRepair services
- D & M Carpentry and Construction LimitedCivil engineering
- Westway Window Systems LimitedJoiners and carpenters
- International Classic Car Sales LtdMotor traders
- Edefec LtdBuilders
- Swansea Scaffolding Services LtdScaffolders
- Lou's Paint and Finish LimitedPainters and decorators
- Mesa Property Development LtdProperty developers
Shared registered office
38 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 Diamond Alloys Swansea 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 May 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 31 May 2027 to 30 Jun 2027 | £150 |
| 1 to 3 months late | 1 Jul 2027 to 30 Aug 2027 | £375 |
| 3 to 6 months late | 31 Aug 2027 to 30 Nov 2027 | £750 |
| More than 6 months late | From 1 Dec 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 31 Aug 2027 | £200 |
| 3 months late | 30 Nov 2027 | another £200 |
| 6 months late | 29 Feb 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Aug 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
- 12799073
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 7 August 2020 (6 years ago)
- Registered office
- Avc House, 21 Northampton Lane, Swansea, SA1 4EH
- Nature of business
- Maintenance and repair of motor vehicles (SIC 45200)
- Year end
- 30 August (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 August 2025
- Last confirmation statement
- 6 August 2026
- Previous names
- Wheel Doc Ltd (until 22 Oct 2020)
Filing notes for vehicle repair garages
Garages hold parts stock and often own diagnostic equipment and ramps, which qualify for capital allowances.
Similar companies in Swansea
Other active vehicle repair garages registered in Swansea.
- Dmo Automotive Services Ltd2026
- Dragon and Shamrock Limited2019
- Dubbers Delight Ltd2018
- East End Garage Limited2018
- Easy Fit Tyres Limited2018
- Esm Commercials Ltd2019
- Evolution Car and Commercial Body Repairs Limited2008
- Family Car Service Ltd2025
All vehicle repair garages in Swansea · All trades in Swansea · Mechanics and garages across the UK
Frequently asked questions
When are Diamond Alloys Swansea Limited's accounts due?
Diamond Alloys Swansea Limited's next accounts are due at Companies House by 30 May 2027 (in 229 days), covering the period to 30 August 2026.
When is Diamond Alloys Swansea Limited's CT600 due?
The CT600 for the period to 30 August 2026 is due at HMRC by 30 August 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 31 May 2027.
Is Diamond Alloys Swansea Limited still trading?
Diamond Alloys Swansea 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 Diamond Alloys Swansea Limited do?
Diamond Alloys Swansea Limited is registered under Maintenance and repair of motor vehicles (SIC 45200).
How old is Diamond Alloys Swansea Limited?
Diamond Alloys Swansea Limited was incorporated on 7 August 2020, 6 years ago.
What is the penalty if Diamond Alloys Swansea 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 Diamond Alloys Swansea 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.