- Companies
- Plumbers and heating engineers
- Ayr
- Gasmark1 Plumbing & Heating Ltd
Gasmark1 Plumbing & Heating Ltd
- Company number
- SC878654
- Incorporated
- 11 Feb 2026
- Registered office
- 35 Newmarket Street, Ayr, KA7 1LL
- Nature of business
- Plumbing, heat and air-conditioning installation
Gasmark1 Plumbing & Heating Ltd is a newly incorporated private limited company registered in Ayr, company number SC878654, one of 27 plumbing and heating companies in Ayr. Its next accounts are due at Companies House on 11 November 2027, and its first CT600 is due at HMRC on 10 February 2028.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
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Where Gasmark1 Plumbing & Heating Ltd is registered
The registered office is in Ayr (KA7), in the South Ayrshire local authority area, Scotland. Show KA7 1LL on a map.
Other trade companies in KA7
- J McEwan & Son Electrical LtdElectricians
- Net Zero Insulation Scot LtdInstallers
- GG Solutions (Scotland) LtdScaffolders
- DD Walsh & Son LtdBuilders
- DM Rodger & Sons LtdProperty developers
- David Thornton Heating Installation Services LtdPlumbers and heating engineers
- RDS Plumbing Heating and Bathrooms LtdBuilders
- Duncan’S Details LtdCleaning companies
Shared registered office
48 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 Gasmark1 Plumbing & Heating 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 11 November 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 12 Nov 2027 to 11 Dec 2027 | £150 |
| 1 to 3 months late | 12 Dec 2027 to 11 Feb 2028 | £375 |
| 3 to 6 months late | 12 Feb 2028 to 11 May 2028 | £750 |
| More than 6 months late | From 12 May 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
- SC878654
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 11 February 2026
- Registered office
- 35 Newmarket Street, Ayr, KA7 1LL
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 28 February (accounting reference date)
- Accounts type
- No accounts filed yet
- Previous names
- Gas Mark 1 Plumbing & Heating Ltd (until 13 Apr 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 Ayr
Other active plumbing and heating companies registered in Ayr.
- Gavin Todd & Son Plumbing & Heating Ltd2024
- Gibson & Goold (Ayr) Limited1954
- GS Plumbing Heating & Gas Ltd2018
- Heat-Ayr Ltd2011
- Heatayr Gas Services Ltd2025
- Johnston & Graham (Scotland) Ltd2017
- K.J.W (Scotland) Ltd2024
- McCutcheon Plumbing & Heating Ltd.2016
All plumbing and heating companies in Ayr · All trades in Ayr · Plumbers and heating engineers across the UK
Frequently asked questions
When are Gasmark1 Plumbing & Heating Ltd's accounts due?
Gasmark1 Plumbing & Heating Ltd's next accounts are due at Companies House by 11 November 2027 (in 394 days), covering the period to 28 February 2027.
When is Gasmark1 Plumbing & Heating Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 10 February 2027, due by 10 February 2028, and one for the period to 28 February 2027, due by 28 February 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Gasmark1 Plumbing & Heating Ltd still trading?
Gasmark1 Plumbing & Heating Ltd 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 Gasmark1 Plumbing & Heating Ltd do?
Gasmark1 Plumbing & Heating Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Gasmark1 Plumbing & Heating Ltd?
Gasmark1 Plumbing & Heating Ltd was incorporated on 11 February 2026, less than a year ago.
What is the penalty if Gasmark1 Plumbing & Heating 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 Gasmark1 Plumbing & Heating Ltd 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.