- Companies
- Plumbers and heating engineers
- Ruislip
- Hartnett Plumbing Ltd
Hartnett Plumbing Ltd
- Company number
- 15647358
- Incorporated
- 15 Apr 20242 years trading
- Registered office
- C/O Asml College House, 17 King Edwards Road, Ruislip, HA4 7AE
- Nature of business
- Plumbing, heat and air-conditioning installation; Other engineering activities
Hartnett Plumbing Ltd is a 2-year-old private limited company registered in Ruislip, company number 15647358, one of 61 plumbing and heating companies in Ruislip. Its next accounts are due at Companies House on 31 January 2027, and the CT600 for the period to 30 April 2026 is due at HMRC on 30 April 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2025
From the balance sheet at 30 April 2025, as filed at Companies House.
Where Hartnett Plumbing Ltd is registered
The registered office is in Ruislip (HA4), in the Hillingdon local authority area, London. Show HA4 7AE on a map.
Other trade companies in HA4
- SSC London LtdGroundworks and demolition
- DCR Industriltdal LtdPainters and decorators
- Katardino Monten for General Contracting and Supplies LtdCivil engineering
- Apex Build & Move LtdBuilders
- Ridgeway Building Contracts LimitedProperty developers
- Azya Farah LtdBuilders
- Howdens Roofing & Guttering LimitedRoofers
- Vetro Glazing LimitedGlaziers
Also registered at this address
14 other companies use the same registered office as Hartnett Plumbing Ltd.
- Blythe Cox LtdProperty developers
- Byrne Engineering & Construction LimitedCivil engineering
- GPM Build LtdProperty developers
- Highpoint Carpentry & Joinery LimitedJoiners and carpenters
- JW Home Improvements LimitedInstallers
- Mummery and Mummery LtdRoofers
- Mummery and Mummery Renewables LtdElectricians
- PWP Visuals LtdSpecialist contractors
- Shellen Construction LimitedInstallers
- Shellen Holdings LimitedBuilders
- Shield Fire Protection Services LimitedElectricians
- Static Electrical Services LimitedElectricians
- UK Blinds Direct LimitedInstallers
- Vicklen LtdElectricians
What happens if Hartnett Plumbing 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 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Feb 2027 to 28 Feb 2027 | £150 |
| 1 to 3 months late | 1 Mar 2027 to 30 Apr 2027 | £375 |
| 3 to 6 months late | 1 May 2027 to 31 Jul 2027 | £750 |
| More than 6 months late | From 1 Aug 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 May 2027 | £200 |
| 3 months late | 30 Jul 2027 | another £200 |
| 6 months late | 30 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Apr 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
- 15647358
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 15 April 2024 (2 years ago)
- Registered office
- C/O Asml College House, 17 King Edwards Road, Ruislip, HA4 7AE
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
Other engineering activities (SIC 71129) - Year end
- 30 April (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 April 2025
- Last confirmation statement
- 14 April 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 Ruislip
Other active plumbing and heating companies registered in Ruislip.
- Holman Plumbing and Heating Ltd2020
- HSL (London) Ltd2013
- Igniteco Group Ltd2024
- Iwbs Plumbing & Heating Ltd2007
- J Mechanical Ltd2016
- J Morris & Sons Limited2011
- JC Plumbing Ltd2015
- JJM Plumbing Limited2023
All plumbing and heating companies in Ruislip · All trades in Ruislip · Plumbers and heating engineers across the UK
Frequently asked questions
When are Hartnett Plumbing Ltd's accounts due?
Hartnett Plumbing Ltd's next accounts are due at Companies House by 31 January 2027 (in 110 days), covering the period to 30 April 2026.
When is Hartnett Plumbing Ltd's CT600 due?
The CT600 for the period to 30 April 2026 is due at HMRC by 30 April 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 February 2027.
Is Hartnett Plumbing Ltd still trading?
Hartnett Plumbing 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 Hartnett Plumbing Ltd do?
Hartnett Plumbing Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220); Other engineering activities (SIC 71129).
How old is Hartnett Plumbing Ltd?
Hartnett Plumbing Ltd was incorporated on 15 April 2024, 2 years ago.
What is the penalty if Hartnett Plumbing 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 Hartnett Plumbing 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.