- Companies
- Installers
- Swansea
- Third Stone Interior Solutions Ltd
Third Stone Interior Solutions Ltd
- Company number
- 12122836
- Incorporated
- 25 Jul 20197 years trading
- Registered office
- 4 Heol Ceri, Waunarlwydd, Swansea, SA5 4QU
- Nature of business
- Other construction installation
Third Stone Interior Solutions Ltd is a 7-year-old private limited company registered in Swansea, company number 12122836, one of 58 installation companies (insulation, lifts, shutters and similar) in Swansea. 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 down £559 (-26.6%) on the year before, to £1,543.
- Net assets rose in 2 of 5 year-on-year comparisons on record.
- Current assets of £6,957 against £13K owed within a year: 0.5 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £1,543 | £6,957 | £13K | 1 | |
| 31 Jul 2024 | £2,102 | £11K | £14K | 1 | |
| 31 Jul 2023 | £8,706 | £20K | £16K | 1 | |
| 31 Jul 2022 | £2,936 | £8,456 | £9,795 | 1 | |
| 31 Jul 2021 | £4,185 | £6,206 | £9,717 | £12K | 0 |
| 31 Jul 2020 | -£1,166 | £4,378 | £7,014 | £10K | 0 |
Where Third Stone Interior Solutions Ltd is registered
The registered office is in Swansea (SA5), in the Swansea local authority area, Wales. Show SA5 4QU on a map.
Other trade companies in SA5
- Lee.T73 Rail LtdCivil engineering
- LJ Cleaning Swansea LimitedCleaning companies
- Same Day Roof Repairs Swansea LtdRoofers
- Warlow&Co LimitedProperty developers
- RNJ Vehicle Repairs LtdMechanics and garages
- Erj's Recovery and Transportation LtdMotor traders
- Brandrick Group LimitedElectricians
- Chris Chambers Holdings LimitedElectricians
Also registered at this address
12 other companies use the same registered office as Third Stone Interior Solutions Ltd.
- Concept Carpentry Solutions LtdProperty developers
- Freshwater Interiors LtdPlumbers and heating engineers
- Jonsil Bricklaying Contractors LtdInstallers
- Marcus Technical Solutions LtdPlasterers
- Pro-Base Installations LtdInstallers
- RMB Electrical LtdElectricians
- Robert Thomas Painters & Decorators LtdFloor and wall tilers
- S J Bevan Carpentry & Joinery LtdJoiners and carpenters
- Supreme Ceilings & Carpentry LtdJoiners and carpenters
- Thermal Insulation Co. LimitedInstallers
- W4K LtdPlumbers and heating engineers
- West Coast Decorators LtdFloor and wall tilers
What happens if Third Stone Interior Solutions 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
- 12122836
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 25 July 2019 (7 years ago)
- Registered office
- 4 Heol Ceri, Waunarlwydd, Swansea, SA5 4QU
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 24 July 2025
Filing notes for installation companies (insulation, lifts, shutters and similar)
Installation companies (insulation, lifts, shutters, solar and similar) often buy stock and equipment up front, so stock at the year end and capital allowances both affect the tax bill.
Similar companies in Swansea
Other active installation companies (insulation, lifts, shutters and similar) registered in Swansea.
- Tidybuild Ltd2016
- Tocs Solutions Limited2018
- Tondo Design & Build Limited2018
- TRC Groundworks & Construction Ltd2026
- UK Mezzanine Direct Ltd2022
- Warm Homes Energy Solutions Ltd2025
- Wayne Griffiths Home Refurbishments Ltd2023
- A.Beynon Agri Envirocon Limited2011
All installation companies (insulation, lifts, shutters and similar) in Swansea · All trades in Swansea · Installers across the UK
Frequently asked questions
When are Third Stone Interior Solutions Ltd's accounts due?
Third Stone Interior Solutions Ltd's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is Third Stone Interior Solutions 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 Third Stone Interior Solutions Ltd still trading?
Third Stone Interior Solutions Ltd is listed as active on the Companies House register (checked 12 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 Third Stone Interior Solutions Ltd do?
Third Stone Interior Solutions Ltd is registered under Other construction installation (SIC 43290).
How old is Third Stone Interior Solutions Ltd?
Third Stone Interior Solutions Ltd was incorporated on 25 July 2019, 7 years ago.
What is the penalty if Third Stone Interior Solutions 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 Third Stone Interior Solutions Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 12 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.