- Companies
- Plumbers and heating engineers
- London
- 1 H Construction Limited
1 H Construction Limited
- Company number
- 17328391
- Incorporated
- 8 Jul 2026
- Registered office
- 237 Westcombe Hill, London, SE3 7DW
- Nature of business
- Plumbing, heat and air-conditioning installation
1 H Construction Limited is a newly incorporated private limited company registered in London, company number 17328391, one of 2,972 plumbing and heating companies in London. Its next accounts are due at Companies House on 8 April 2028, and its first CT600 is due at HMRC on 7 July 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 1 H Construction Limited is registered
The registered office is in London (SE3), in the Greenwich local authority area, London. Show SE3 7DW on a map.
Other trade companies in SE3
- Azaway LtdMotor traders
- Sunny Star Drylining LtdBuilders
- Lina Cleaning Services LtdCleaning companies
- J&J Property Works LtdJoiners and carpenters
- Nirvana Climate Solutions LtdPlumbers and heating engineers
- Akers Mep Services LtdPlumbers and heating engineers
- Pinewood Electrical LtdElectricians
- Zufc LtdCleaning companies
Shared registered office
29 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 1 H Construction 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 8 April 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 9 Apr 2028 to 8 May 2028 | £150 |
| 1 to 3 months late | 9 May 2028 to 8 Jul 2028 | £375 |
| 3 to 6 months late | 9 Jul 2028 to 8 Oct 2028 | £750 |
| More than 6 months late | From 9 Oct 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Aug 2028 | £200 |
| 3 months late | 31 Oct 2028 | another £200 |
| 6 months late | 31 Jan 2029 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jul 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
- 17328391
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 July 2026
- Registered office
- 237 Westcombe Hill, London, SE3 7DW
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 July (accounting reference date)
- Accounts type
- No accounts filed yet
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 London
Other active plumbing and heating companies registered in London.
- 1066DPS Limited2025
- 1ST Boiler Care Ltd2022
- 1ST Class Heating and Air Conditioning Limited2024
- 1ST Plumbers Ltd2023
- 1ST Solution Gas and Plumbing Ltd2026
- 237 Gas Limited2024
- 24 Carat Interiors Ltd2026
- 24 Fix Ltd2024
All plumbing and heating companies in London · All trades in London · Plumbers and heating engineers across the UK
Frequently asked questions
When are 1 H Construction Limited's accounts due?
1 H Construction Limited's next accounts are due at Companies House by 8 April 2028 (in 544 days), covering the period to 31 July 2027.
When is 1 H Construction Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 7 July 2027, due by 7 July 2028, and one for the period to 31 July 2027, due by 31 July 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is 1 H Construction Limited still trading?
1 H Construction 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 1 H Construction Limited do?
1 H Construction Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is 1 H Construction Limited?
1 H Construction Limited was incorporated on 8 July 2026, less than a year ago.
What is the penalty if 1 H Construction 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 1 H Construction 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.