- Companies
- Plumbers and heating engineers
- London
- Onsite Contractors & Plumbing Ltd
Onsite Contractors & Plumbing Ltd
- Company number
- 09510946
- Incorporated
- 26 Mar 201511 years trading
- Registered office
- Apex House, 2ND Floor, Grand Arcade, London, N12 0EH
- Nature of business
- Plumbing, heat and air-conditioning installation
Onsite Contractors & Plumbing Ltd is a 11-year-old private limited company registered in London, company number 09510946, one of 2,972 plumbing and heating companies in London. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 2027.
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 £12K (+261.6%) on the year before, to £17K.
- Net assets rose in 6 of 8 year-on-year comparisons on record.
- Current assets of £83K against £62K owed within a year: 1.3 times cover.
- 2 employees on average, down from 3 the year before.
- Balance sheets on record for 9 years, 2017 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £17K | £81K | £83K | £62K | 2 |
| 31 Mar 2024 | £4,597 | £21K | £32K | £29K | 3 |
| 31 Mar 2023 | £13K | £22K | £29K | £21K | 3 |
| 31 Mar 2022 | £11K | £12K | £28K | £25K | 2 |
| 31 Mar 2021 | £7,809 | £22K | £47K | £45K | 0 |
| 31 Mar 2020 | £4,477 | £5,389 | £16K | £20K | 1 |
| 31 Mar 2019 | £858 | £1,919 | £15K | £15K | 1 |
| 31 Mar 2018 | £875 | £458 | £10K | £11K | |
| 31 Mar 2017 | £312 | £2,592 | £4,610 | £5,637 | 2 |
Where Onsite Contractors & Plumbing Ltd is registered
The registered office is in London (N12), in the Barnet local authority area, London. Show N12 0EH on a map.
Other trade companies in N12
- Sullivan Property and Maintenance LtdFacilities management
- Mael Property Services LtdFinishing trades
- Horizon Constructors LtdProperty developers
- Alfawine Group LimitedFinishing trades
- Sam Motors Group LimitedMotor traders
- Heating on Demand LtdPlumbers and heating engineers
- Premium Electrical LtdElectricians
- Amaiya Sparks LtdCleaning companies
Shared registered office
27 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 Onsite Contractors & 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 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 09510946
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 26 March 2015 (11 years ago)
- Registered office
- Apex House, 2ND Floor, Grand Arcade, London, N12 0EH
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 26 March 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 London
Other active plumbing and heating companies registered in London.
- Onus Plumbing & Heating Limited2024
- Onyx Electrical & Plumbing Ltd2026
- Onyx Heating and Plumbing Ltd2026
- Optimal Engineering Ltd2024
- Optimal Transformation Firm Ltd2021
- Optimo Services Limited2025
- Optimum Flow Ltd2016
- Optimus Ecoheat Ltd2025
All plumbing and heating companies in London · All trades in London · Plumbers and heating engineers across the UK
Frequently asked questions
When are Onsite Contractors & Plumbing Ltd's accounts due?
Onsite Contractors & Plumbing Ltd's next accounts are due at Companies House by 31 December 2026 (in 78 days), covering the period to 31 March 2026.
When is Onsite Contractors & Plumbing Ltd's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is Onsite Contractors & Plumbing Ltd still trading?
Onsite Contractors & 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 Onsite Contractors & Plumbing Ltd do?
Onsite Contractors & Plumbing Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Onsite Contractors & Plumbing Ltd?
Onsite Contractors & Plumbing Ltd was incorporated on 26 March 2015, 11 years ago.
What is the penalty if Onsite Contractors & 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 Onsite Contractors & 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.