- Companies
- Plumbers and heating engineers
- London
- Duct Install UK Limited
Duct Install UK Limited
- Company number
- 11123952
- Incorporated
- 22 Dec 20178 years trading
- Registered office
- 128 City Road, London, EC1V 2NX
- Nature of business
- Plumbing, heat and air-conditioning installation
Duct Install UK Limited is a 8-year-old private limited company registered in London, company number 11123952, one of 2,972 plumbing and heating companies in London. Its next accounts are due at Companies House on 30 September 2027, and the CT600 for the period to 31 December 2026 is due at HMRC on 31 December 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 £4,226 (+479.1%) on the year before, to £5,108.
- Net assets rose in 3 of 7 year-on-year comparisons on record.
- Current assets of £116K against £117K owed within a year: 1.0 times cover.
- 2 employees on average, down from 3 the year before.
- Balance sheets on record for 8 years, 2018 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2025 | £5,108 | £116K | £117K | 2 | |
| 31 Dec 2024 | £882 | £118K | £125K | 3 | |
| 31 Dec 2023 | £433 | £119K | £127K | 2 | |
| 31 Dec 2022 | £1,017 | £101K | £110K | 2 | |
| 31 Dec 2021 | £883 | £111K | £121K | 2 | |
| 31 Dec 2020 | £1,164 | £105K | £117K | 2 | |
| 31 Dec 2019 | £1,370 | £112K | £124K | 3 | |
| 31 Dec 2018 | £1,744 | £81K | £93K |
Where Duct Install UK Limited is registered
The registered office is in London (EC1V), in the Islington local authority area, London. Show EC1V 2NX on a map.
Other trade companies in EC1V
- Cardiff Electrical Solutions LtdElectricians
- Edemis Construction LtdBuilders
- Zaylan LtdProperty developers
- Pronto Roofing and Construction LtdRoofers
- Instal Systems LtdPlumbers and heating engineers
- J&R Partners LtdBuilders
- The Tile Craft LtdFinishing trades
- Cathal Od Solutions LtdSpecialist contractors
Shared registered office
2,436 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 Duct Install UK 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 September 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Oct 2027 to 31 Oct 2027 | £150 |
| 1 to 3 months late | 1 Nov 2027 to 31 Dec 2027 | £375 |
| 3 to 6 months late | 1 Jan 2028 to 31 Mar 2028 | £750 |
| More than 6 months late | From 1 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2028 | £200 |
| 3 months late | 31 Mar 2028 | another £200 |
| 6 months late | 30 Jun 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 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
- 11123952
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 22 December 2017 (8 years ago)
- Registered office
- 128 City Road, London, EC1V 2NX
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 December (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 December 2025
- Last confirmation statement
- 9 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.
- Dudleys Plumbing & Heating Limited2014
- Dudu's Plumbing Plus Limited2025
- Duffmeister Ltd2023
- Dufrayer Heatflow Solutions Ltd2025
- Dunbar’S Plumbing Limited2023
- Dutch Tech Ltd2024
- DWM Construction Ltd2021
- E A Plumbing Ltd2026
All plumbing and heating companies in London · All trades in London · Plumbers and heating engineers across the UK
Frequently asked questions
When are Duct Install UK Limited's accounts due?
Duct Install UK Limited's next accounts are due at Companies House by 30 September 2027 (in 352 days), covering the period to 31 December 2026.
When is Duct Install UK Limited's CT600 due?
The CT600 for the period to 31 December 2026 is due at HMRC by 31 December 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 October 2027.
Is Duct Install UK Limited still trading?
Duct Install UK 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 Duct Install UK Limited do?
Duct Install UK Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Duct Install UK Limited?
Duct Install UK Limited was incorporated on 22 December 2017, 8 years ago.
What is the penalty if Duct Install UK 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 Duct Install UK 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.