- Companies
- Plumbers and heating engineers
- Abergavenny
- Gas Mark One Limited
Gas Mark One Limited
- Company number
- 12437826
- Incorporated
- 3 Feb 20206 years trading
- Registered office
- Chestnut Tree Cottage Blaenavon Road, Govilon, Abergavenny, Gwent, NP7 9PF
- Nature of business
- Plumbing, heat and air-conditioning installation
Gas Mark One Limited is a 6-year-old private limited company registered in Abergavenny, company number 12437826, one of 8 plumbing and heating companies in Abergavenny. Its next accounts are due at Companies House on 30 November 2027, and the CT600 for the period to 28 February 2027 is due at HMRC on 28 February 2028.
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 £9,708 (+11.9%) on the year before, to £91K.
- Net assets rose in 5 of 5 year-on-year comparisons on record.
- Current assets of £92K against £47K owed within a year: 2.0 times cover.
- 2 employees on average, down from 3 the year before.
- Balance sheets on record for 6 years, 2021 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 28 Feb 2026 | £91K | £92K | £47K | 2 | |
| 28 Feb 2025 | £82K | £58K | £32K | 3 | |
| 29 Feb 2024 | £66K | £59K | £23K | 2 | |
| 28 Feb 2023 | £12K | £36K | £25K | 2 | |
| 28 Feb 2022 | £226 | £29K | £30K | 1 | |
| 28 Feb 2021 | £100 |
Where Gas Mark One Limited is registered
The registered office is in Abergavenny (NP7), in the Monmouthshire local authority area, Wales. Show NP7 9PF on a map.
Other trade companies in NP7
- Abergavenny Car Wash LimitedMechanics and garages
- Prysm Group LimitedBuilders
- Lanes Recovery (Gloucester) LimitedMechanics and garages
- The Reliable Cleaning Company LtdCleaning companies
- Danter Properties LtdProperty developers
- Aseado Cleaning LtdCleaning companies
- J W Property and Garden Maintenance LtdProperty developers
- Pro Build Concepts LimitedProperty developers
What happens if Gas Mark One 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 November 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Dec 2027 to 31 Dec 2027 | £150 |
| 1 to 3 months late | 1 Jan 2028 to 29 Feb 2028 | £375 |
| 3 to 6 months late | 1 Mar 2028 to 31 May 2028 | £750 |
| More than 6 months late | From 1 Jun 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 29 Feb 2028 | £200 |
| 3 months late | 28 May 2028 | another £200 |
| 6 months late | 28 Aug 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 2029 | 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
- 12437826
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 3 February 2020 (6 years ago)
- Registered office
- Chestnut Tree Cottage Blaenavon Road, Govilon, Abergavenny, Gwent, NP7 9PF
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 29 February (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 28 February 2026
- Last confirmation statement
- 2 February 2026
Filing notes for plumbing and heating companies
Plumbing and heating companies frequently work under CIS for main contractors and also directly for homeowners, so turnover can mix CIS and non-CIS income.
Similar companies in Abergavenny
Other active plumbing and heating companies registered in Abergavenny.
- J Holland Plumbing and Heating Ltd2021
- Mirage Plumbing Supplies Limited2009
- Smart Heating Solutions (SW ) Ltd2023
- Spartan Heating & Plumbing Services Ltd2021
- WCR Plumbing and Maintenance Ltd2019
- Ab Plumbing and Property Services Ltd2025
- C Walters Heating Services Ltd2022
All plumbing and heating companies in Abergavenny · All trades in Abergavenny · Plumbers and heating engineers across the UK
Frequently asked questions
When are Gas Mark One Limited's accounts due?
Gas Mark One Limited's next accounts are due at Companies House by 30 November 2027 (in 413 days), covering the period to 28 February 2027.
When is Gas Mark One Limited's CT600 due?
The CT600 for the period to 28 February 2027 is due at HMRC by 28 February 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 December 2027.
Is Gas Mark One Limited still trading?
Gas Mark One 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 Gas Mark One Limited do?
Gas Mark One Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Gas Mark One Limited?
Gas Mark One Limited was incorporated on 3 February 2020, 6 years ago.
What is the penalty if Gas Mark One 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 Gas Mark One 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.