- Companies
- Installers
- Milford Haven
- Thermalvent (Wales & West) Limited
Thermalvent (Wales & West) Limited
- Company number
- 11619150
- Incorporated
- 12 Oct 20188 years trading
- Registered office
- First Floor Custom Building, Milford Marina, Milford Haven, Pembrokeshire, SA73 3AA
- Nature of business
- Other construction installation
Thermalvent (Wales & West) Limited is a 8-year-old private limited company registered in Milford Haven, company number 11619150, one of 8 installation companies (insulation, lifts, shutters and similar) in Milford Haven. 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 down £37K (-33.4%) on the year before, to £73K.
- Net assets rose in 4 of 7 year-on-year comparisons on record.
- Current assets of £56K against £10K owed within a year: 5.4 times cover.
- 1 employee on average, down from 3 the year before.
- 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 |
|---|---|---|---|---|---|
| 30 Sep 2025 | £73K | £36K | £56K | £10K | 1 |
| 31 Mar 2024 | £110K | £63K | £153K | £96K | 3 |
| 31 Mar 2023 | £80K | £43K | £131K | £70K | 2 |
| 31 Mar 2022 | £49K | £21K | £137K | £94K | 1 |
| 31 Mar 2021 | £27K | £13K | £110K | £89K | 1 |
| 31 Mar 2020 | £100 | £100 | |||
| 31 Oct 2019 | £100 | £100 | |||
| 12 Oct 2018 | £100 | £100 |
Where Thermalvent (Wales & West) Limited is registered
The registered office is in Milford Haven (SA73), in the Pembrokeshire local authority area, Wales. Show SA73 3AA on a map.
Other trade companies in SA73
- An Construction & Maintenance LtdBuilders
- Haven Coast Group Developments 1 LtdProperty developers
- Pembs Ice Blasting LtdCleaning companies
- Haven Coast Group LimitedProperty developers
- MR GS Mobile Tyres LtdMechanics and garages
- WBG Facilities LimitedScaffolders
- HW Builders LtdBuilders
- Pro Scaffolding Pembs LtdScaffolders
Also registered at this address
1 other company uses the same registered office as Thermalvent (Wales & West) Limited.
- P & H Services (South Wales) LimitedInstallers
What happens if Thermalvent (Wales & West) 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
- 11619150
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 12 October 2018 (8 years ago)
- Registered office
- First Floor Custom Building, Milford Marina, Milford Haven, Pembrokeshire, SA73 3AA
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 30 September (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 2 September 2026
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 Milford Haven
Other active installation companies (insulation, lifts, shutters and similar) registered in Milford Haven.
- Ventfab Ltd2025
- West Wales Leisure Ltd2025
- DP Stoves & Fireplaces Ltd2021
- Energro Limited2026
- Hall Insulation Ltd2019
- KGM Welding Limited2020
- P & H Services (South Wales) Limited2004
All installation companies (insulation, lifts, shutters and similar) in Milford Haven · All trades in Milford Haven · Installers across the UK
Frequently asked questions
When are Thermalvent (Wales & West) Limited's accounts due?
Thermalvent (Wales & West) Limited's next accounts are due at Companies House by 30 June 2027 (in 259 days), covering the period to 30 September 2026.
When is Thermalvent (Wales & West) 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 Thermalvent (Wales & West) Limited still trading?
Thermalvent (Wales & West) 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 Thermalvent (Wales & West) Limited do?
Thermalvent (Wales & West) Limited is registered under Other construction installation (SIC 43290).
How old is Thermalvent (Wales & West) Limited?
Thermalvent (Wales & West) Limited was incorporated on 12 October 2018, 8 years ago.
What is the penalty if Thermalvent (Wales & West) 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 Thermalvent (Wales & West) 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.