- Companies
- Installers
- London
- NJ Ductwork Limited
NJ Ductwork Limited
- Company number
- 09138194
- Incorporated
- 18 Jul 201412 years trading
- Registered office
- 7 Kenmare Drive, London, N17 6QS
- Nature of business
- Other construction installation
NJ Ductwork Limited is a 12-year-old private limited company registered in London, company number 09138194, one of 2,278 installation companies (insulation, lifts, shutters and similar) in London. Its next accounts are due at Companies House on 30 April 2027, and the CT600 for the period to 30 July 2026 is due at HMRC on 30 July 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 £9,251 (+98.6%) on the year before, to £19K.
- Net assets rose in 6 of 9 year-on-year comparisons on record.
- Current assets of £22K against £3,190 owed within a year: 7.0 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Jul 2025 | £19K | £22K | £3,190 | 0 | |
| 30 Jul 2024 | £9,378 | £10K | £309 | 0 | |
| 30 Jul 2023 | £8,060 | £9,575 | £1,156 | 0 | |
| 30 Jul 2022 | £5,636 | £6,225 | £266 | 0 | |
| 30 Jul 2021 | £4,901 | £6,407 | £1,147 | 0 | |
| 30 Jul 2020 | £478 | £6,799 | £6,321 | 0 | |
| 31 Jul 2019 | £13 | £6,225 | £6,212 | 0 | |
| 30 Jul 2018 | £69 | £5,759 | £5,690 | ||
| 31 Jul 2017 | £391 | £9,550 | £9,159 | ||
| 31 Jul 2016 | £823 | £9,249 | £8,426 |
Where NJ Ductwork Limited is registered
The registered office is in London (N17), in the Haringey local authority area, London. Show N17 6QS on a map.
Other trade companies in N17
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- Vas-Vent LtdSpecialist contractors
- Zbrsons LtdMotor traders
- Bally 33 LtdBuilders
- Abcd Cleaning LtdCleaning companies
- Mie Cleaning Solutions LtdCleaning companies
- Worklane LtdRoofers
- Figzu LtdCleaning companies
What happens if NJ Ductwork 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 30 April 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 May 2027 to 31 May 2027 | £150 |
| 1 to 3 months late | 1 Jun 2027 to 31 Jul 2027 | £375 |
| 3 to 6 months late | 1 Aug 2027 to 31 Oct 2027 | £750 |
| More than 6 months late | From 1 Nov 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 31 Jul 2027 | £200 |
| 3 months late | 30 Oct 2027 | another £200 |
| 6 months late | 30 Jan 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Jul 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
- 09138194
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 18 July 2014 (12 years ago)
- Registered office
- 7 Kenmare Drive, London, N17 6QS
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 30 July (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 July 2025
- Last confirmation statement
- 28 July 2026
Filing notes for installation companies (insulation, lifts, shutters and similar)
Installation companies (insulation, lifts, shutters, solar and similar) often buy stock and equipment up front, so stock at the year end and capital allowances both affect the tax bill.
Similar companies in London
Other active installation companies (insulation, lifts, shutters and similar) registered in London.
- NJ Works Ltd2026
- NK Estate & Management Ltd2025
- NK Plus Ltd2019
- Noah Construction London Ltd2024
- Noble7 Property Solutions Ltd2025
- Nolan Hill Ltd2026
- North 20 Limited2022
- North London Construction Ltd2016
All installation companies (insulation, lifts, shutters and similar) in London · All trades in London · Installers across the UK
Frequently asked questions
When are NJ Ductwork Limited's accounts due?
NJ Ductwork Limited's next accounts are due at Companies House by 30 April 2027 (in 199 days), covering the period to 30 July 2026.
When is NJ Ductwork Limited's CT600 due?
The CT600 for the period to 30 July 2026 is due at HMRC by 30 July 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 May 2027.
Is NJ Ductwork Limited still trading?
NJ Ductwork 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 NJ Ductwork Limited do?
NJ Ductwork Limited is registered under Other construction installation (SIC 43290).
How old is NJ Ductwork Limited?
NJ Ductwork Limited was incorporated on 18 July 2014, 12 years ago.
What is the penalty if NJ Ductwork 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 NJ Ductwork 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.