- Companies
- Plumbers and heating engineers
- Longfield
- Interlock Plumbing & Heating Limited
Interlock Plumbing & Heating Limited
- Company number
- 17379037
- Incorporated
- 4 Aug 2026
- Registered office
- 18 Punch Croft, New Ash Green, Longfield, DA3 8HP
- Nature of business
- Plumbing, heat and air-conditioning installation
Interlock Plumbing & Heating Limited is a newly incorporated private limited company registered in Longfield, company number 17379037, one of 12 plumbing and heating companies in Longfield. Its next accounts are due at Companies House on 4 May 2028, and its first CT600 is due at HMRC on 3 August 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.
Is this your company?
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Where Interlock Plumbing & Heating Limited is registered
The registered office is in Longfield (DA3), in the Sevenoaks local authority area, South East. Show DA3 8HP on a map.
Other trade companies in DA3
- Heat Exchangers LtdPlumbers and heating engineers
- Ohq Management LimitedFinishing trades
- J Roe Scaffolding LimitedScaffolders
- A T Installations (2026) LimitedPlumbers and heating engineers
- Window Medic Kent LimitedJoiners and carpenters
- BMDZ Group LtdCleaning companies
- Thain Air Conditioning Services LtdPlumbers and heating engineers
- Hartley Windscreens and Sons LtdMechanics and garages
Also registered at this address
10 other companies use the same registered office as Interlock Plumbing & Heating Limited.
- A T Installations (2026) LimitedPlumbers and heating engineers
- C.O.W.Enterprises (2025) LimitedFinishing trades
- Higham Estates LimitedProperty developers
- J Roe Scaffolding LimitedScaffolders
- Kent Drywall Solutions LimitedProperty developers
- Millennium Auto Glazing LimitedMechanics and garages
- NR Building (2016) LimitedFinishing trades
- Ohq Management LimitedFinishing trades
- Oj Creations LimitedProperty developers
- Qho Consultancy LimitedProperty developers
What happens if Interlock Plumbing & Heating 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 4 May 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 5 May 2028 to 4 Jun 2028 | £150 |
| 1 to 3 months late | 5 Jun 2028 to 4 Aug 2028 | £375 |
| 3 to 6 months late | 5 Aug 2028 to 4 Nov 2028 | £750 |
| More than 6 months late | From 5 Nov 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Sep 2028 | £200 |
| 3 months late | 30 Nov 2028 | another £200 |
| 6 months late | 28 Feb 2029 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Aug 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
- 17379037
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 4 August 2026
- Registered office
- 18 Punch Croft, New Ash Green, Longfield, DA3 8HP
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 August (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 22 September 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 Longfield
Other active plumbing and heating companies registered in Longfield.
- SP Services (Kent) Ltd2025
- Stuart Baldwin Limited2012
- Thain Air Conditioning Services Ltd2026
- A T Installations (2026) Limited2026
- DLS Kent Limited2022
- DPM Plumbing and Heating Limited2015
- DTK Property Services Limited2014
- Eco Warm Services Ltd2018
All plumbing and heating companies in Longfield · All trades in Longfield · Plumbers and heating engineers across the UK
Frequently asked questions
When are Interlock Plumbing & Heating Limited's accounts due?
Interlock Plumbing & Heating Limited's next accounts are due at Companies House by 4 May 2028 (in 569 days), covering the period to 31 August 2027.
When is Interlock Plumbing & Heating 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 3 August 2027, due by 3 August 2028, and one for the period to 31 August 2027, due by 31 August 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Interlock Plumbing & Heating Limited still trading?
Interlock Plumbing & Heating 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 Interlock Plumbing & Heating Limited do?
Interlock Plumbing & Heating Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Interlock Plumbing & Heating Limited?
Interlock Plumbing & Heating Limited was incorporated on 4 August 2026, less than a year ago.
What is the penalty if Interlock Plumbing & Heating 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 Interlock Plumbing & Heating 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.