- Companies
- Plumbers and heating engineers
- London
- Nucleus Mechanical Ltd
Nucleus Mechanical Ltd
- Company number
- 16181592
- Incorporated
- 13 Jan 20251 year trading
- Registered office
- 3RD Floor, 86-90, Paul Street, London, EC2A 4NE
- Nature of business
- Plumbing, heat and air-conditioning installation
Nucleus Mechanical Ltd is a 1-year-old private limited company registered in London, company number 16181592, one of 2,972 plumbing and heating companies in London. Its next accounts are due at Companies House on 13 October 2026, and its first CT600 is due at HMRC on 12 January 2027.
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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Financial snapshot, 2026
From the balance sheet at 31 January 2026, as filed at Companies House.
Where Nucleus Mechanical Ltd is registered
The registered office is in London (EC2A), in the Hackney local authority area, London. Show EC2A 4NE on a map.
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- A2D Professional Cleaning LtdCleaning companies
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- Paint Hub LimitedMechanics and garages
- SJK Construction & Management LtdBuilders
- Cenlora Cleaning Group LtdCleaning companies
Shared registered office
1,581 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 Nucleus Mechanical 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 13 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 14 Oct 2026 to 13 Nov 2026 | £150 |
| 1 to 3 months late | 14 Nov 2026 to 13 Jan 2027 | £375 |
| 3 to 6 months late | 14 Jan 2027 to 13 Apr 2027 | £750 |
| More than 6 months late | From 14 Apr 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2027 | £200 |
| 3 months late | 30 Apr 2027 | another £200 |
| 6 months late | 31 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- 16181592
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 January 2025 (1 year ago)
- Registered office
- 3RD Floor, 86-90, Paul Street, London, EC2A 4NE
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 January (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 12 January 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.
- Nuova Plumbing Ltd2023
- NV Plumbing & Heating Ltd.2015
- NVH Heating and Plumbing Ltd2026
- NW Heating Ltd2022
- NW3 Plumbing and Heating Ltd2026
- Nyako Construction Limited2024
- Nycolle06 Limited2023
- Nym Plumbing and Heating Limited2022
All plumbing and heating companies in London · All trades in London · Plumbers and heating engineers across the UK
Frequently asked questions
When are Nucleus Mechanical Ltd's accounts due?
Nucleus Mechanical Ltd's next accounts are due at Companies House by 13 October 2026 (tomorrow), covering the period to 31 January 2026.
When is Nucleus Mechanical 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 12 January 2026, due by 12 January 2027, and one for the period to 31 January 2026, due by 31 January 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Nucleus Mechanical Ltd still trading?
Nucleus Mechanical 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 Nucleus Mechanical Ltd do?
Nucleus Mechanical Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Nucleus Mechanical Ltd?
Nucleus Mechanical Ltd was incorporated on 13 January 2025, 1 year ago.
What is the penalty if Nucleus Mechanical 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 Nucleus Mechanical 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.