- Company number
- 14217127
- Incorporated
- 5 Jul 20224 years trading
- Registered office
- 2 Fontwell Drive, Reading, RG30 4QR
- Nature of business
- Construction of domestic buildings; Plumbing, heat and air-conditioning installation
Ac Vent-System Ltd is a 4-year-old private limited company registered in Reading, company number 14217127, one of 426 building contractors in Reading. Its next accounts are due at Companies House on 30 April 2027, and the CT600 for the period to 31 July 2026 is due at HMRC on 31 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 £3,970 (+52.7%) on the year before, to £11K.
- Current assets of £21K against £7,010 owed within a year: 3.1 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 3 years, 2023 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jul 2025 | £11K | £1,990 | £21K | £7,010 | 2 |
| 31 Jul 2024 | £7,528 | £85 | £10K | £2,916 | 2 |
| 31 Jul 2023 | £100 | £4,840 | £13K | £13K | 2 |
Where Ac Vent-System Ltd is registered
The registered office is in Reading (RG30), in the Reading local authority area, South East. Show RG30 4QR on a map.
Other trade companies in RG30
- Precision Motors LimitedMotor traders
- Kingdom Motors & Services LtdFacilities management
- Great Cleaning Ltd. LtdCleaning companies
- Aj Waite Builders LimitedBuilders
- BG Windows Doors and Conservatories LtdInstallers
- Thoroughly Clean UK LtdCleaning companies
- Infinnity LtdBuilders
- C Collins LtdCivil engineering
What happens if Ac Vent-System 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 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 | 1 Aug 2027 | £200 |
| 3 months late | 31 Oct 2027 | another £200 |
| 6 months late | 31 Jan 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 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
- 14217127
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 5 July 2022 (4 years ago)
- Registered office
- 2 Fontwell Drive, Reading, RG30 4QR
- Nature of business
- Construction of domestic buildings (SIC 41202)
Plumbing, heat and air-conditioning installation (SIC 43220) - Year end
- 31 July (accounting reference date)
- Accounts type
- Unaudited abridged
- Last accounts made up to
- 31 July 2025
- Last confirmation statement
- 4 July 2026
- Previous names
- A C Ducting Ltd (until 13 Jul 2022)
Filing notes for building contractors
Building companies often run the Construction Industry Scheme as a contractor, a subcontractor or both. CIS deductions suffered during the year are set against the PAYE bill, and any unrecovered balance at the year end matters when the accounts are drawn up.
Similar companies in Reading
Other active building contractors registered in Reading.
- Ace Global Management Services Ltd2013
- Adg Commercial & Domestic Ltd2023
- Agamdeep Construction Limited2023
- Aj Sellwood Building Solutions Limited2019
- Aj Waite Builders Limited2026
- Ajg Groundwork’S Services Ltd2026
- Akre Construction Limited2025
- Akree Limited2019
All building contractors in Reading · All trades in Reading · Builders across the UK
Frequently asked questions
When are Ac Vent-System Ltd's accounts due?
Ac Vent-System Ltd's next accounts are due at Companies House by 30 April 2027 (in 199 days), covering the period to 31 July 2026.
When is Ac Vent-System Ltd's CT600 due?
The CT600 for the period to 31 July 2026 is due at HMRC by 31 July 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 May 2027.
Is Ac Vent-System Ltd still trading?
Ac Vent-System 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 Ac Vent-System Ltd do?
Ac Vent-System Ltd is registered under Construction of domestic buildings (SIC 41202); Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Ac Vent-System Ltd?
Ac Vent-System Ltd was incorporated on 5 July 2022, 4 years ago.
What is the penalty if Ac Vent-System 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 Ac Vent-System 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.