- Companies
- Installers
- Knebworth
- Smart Ventilation Systems Ltd
Smart Ventilation Systems Ltd
- Company number
- 13850225
- Incorporated
- 14 Jan 20224 years trading
- Registered office
- Unit A2 Nup End, Old Knebworth, Knebworth, Hertfordshire, SG3 6QJ
- Nature of business
- Other construction installation
Smart Ventilation Systems Ltd is a 4-year-old private limited company registered in Knebworth, company number 13850225, one of the UK's installation companies (insulation, lifts, shutters and similar). Its next accounts are due at Companies House on 31 October 2027, and the CT600 for the period to 31 January 2027 is due at HMRC on 31 January 2028.
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 £137K on the year before, to £147K.
- Net assets rose in 1 of 3 year-on-year comparisons on record.
- Current assets of £336K against £218K owed within a year: 1.5 times cover.
- 3 employees on average, up from 0 the year before.
- Balance sheets on record for 4 years, 2023 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jan 2026 | £147K | £82K | £336K | £218K | 3 |
| 31 Jan 2025 | £11K | £50K | £126K | £133K | 0 |
| 31 Jan 2024 | £30K | £5,209 | £33K | £26K | 1 |
| 31 Jan 2023 | £48K | £23K | £71K | £32K | 0 |
Where Smart Ventilation Systems Ltd is registered
The registered office is in Knebworth (SG3), in the North Hertfordshire local authority area, East of England. Show SG3 6QJ on a map.
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What happens if Smart Ventilation Systems 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 October 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Nov 2027 to 30 Nov 2027 | £150 |
| 1 to 3 months late | 1 Dec 2027 to 31 Jan 2028 | £375 |
| 3 to 6 months late | 1 Feb 2028 to 30 Apr 2028 | £750 |
| More than 6 months late | From 1 May 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2028 | £200 |
| 3 months late | 30 Apr 2028 | another £200 |
| 6 months late | 31 Jul 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- 13850225
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 14 January 2022 (4 years ago)
- Registered office
- Unit A2 Nup End, Old Knebworth, Knebworth, Hertfordshire, SG3 6QJ
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 January (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 January 2026
- Last confirmation statement
- 14 February 2026
- Charges (mortgages)
- 1 outstanding of 1 registered
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.
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Frequently asked questions
When are Smart Ventilation Systems Ltd's accounts due?
Smart Ventilation Systems Ltd's next accounts are due at Companies House by 31 October 2027 (in 384 days), covering the period to 31 January 2027.
When is Smart Ventilation Systems Ltd's CT600 due?
The CT600 for the period to 31 January 2027 is due at HMRC by 31 January 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 November 2027.
Is Smart Ventilation Systems Ltd still trading?
Smart Ventilation Systems 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 Smart Ventilation Systems Ltd do?
Smart Ventilation Systems Ltd is registered under Other construction installation (SIC 43290).
How old is Smart Ventilation Systems Ltd?
Smart Ventilation Systems Ltd was incorporated on 14 January 2022, 4 years ago.
What is the penalty if Smart Ventilation Systems 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 Smart Ventilation Systems 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.