- Companies
- Plumbers and heating engineers
- Basildon
- Alter Air Ventilation Ltd
Alter Air Ventilation Ltd
- Company number
- 11726218
- Incorporated
- 13 Dec 20187 years trading
- Registered office
- 29 Nottingham Way, Langdon Hills, Basildon, SS16 6TR
- Nature of business
- Plumbing, heat and air-conditioning installation
Alter Air Ventilation Ltd is a 7-year-old private limited company registered in Basildon, company number 11726218, one of 140 plumbing and heating companies in Basildon. Its next accounts are due at Companies House on 31 December 2026, and its first CT600 is due at HMRC on 31 December 2026.
Key dates
Worked out from the year end and filing history on the Companies House register.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Alter Air Ventilation LtdOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
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 £25K on the year before, to £27K.
- Net assets rose in 3 of 5 year-on-year comparisons on record.
- Current assets of £54K against £25K owed within a year: 2.1 times cover.
- 2 employees on average, up from 1 the year before.
- Balance sheets on record for 6 years, 2019 to 2024.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2024 | £27K | £54K | £25K | 2 | |
| 31 Dec 2023 | £2,452 | £24K | £27K | 1 | |
| 31 Dec 2022 | £4,612 | £24K | £28K | 1 | |
| 31 Dec 2021 | £6,838 | £7,150 | £6,206 | 1 | |
| 31 Dec 2020 | £1,624 | £4,545 | £2,344 | 1 | |
| 31 Dec 2019 | £412 | £2,533 | £1,641 | 1 |
Where Alter Air Ventilation Ltd is registered
The registered office is in Basildon (SS16), in the Basildon local authority area, East of England. Show SS16 6TR on a map.
Other trade companies in SS16
- Kga Commercial LimitedSpecialist contractors
- Banenas Construction LtdBuilders
- Volcov Constructions LtdBuilders
- Pearly Plasterer LtdBuilders
- Valkvay LtdJoiners and carpenters
- Aska Construction LtdBuilders
- PMG Flooring LtdFloor and wall tilers
- VHN IT LtdElectricians
What happens if Alter Air Ventilation 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 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 11726218
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 December 2018 (7 years ago)
- Registered office
- 29 Nottingham Way, Langdon Hills, Basildon, SS16 6TR
- 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 2024
- Last confirmation statement
- 12 December 2025
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 Basildon
Other active plumbing and heating companies registered in Basildon.
- Amazon Renewables Ltd2019
- Amelux Plumbing Ltd2025
- Anglo Plumbing Ltd2010
- Asset Care London Ltd2026
- Beautiful Bathrooms Installations Limited2021
- BG Premier Bathrooms & Plumbing Limited2024
- Blue 8 Gas Services Ltd2024
- BPS Plumbing Limited2019
All plumbing and heating companies in Basildon · All trades in Basildon · Plumbers and heating engineers across the UK
Frequently asked questions
When are Alter Air Ventilation Ltd's accounts due?
Alter Air Ventilation Ltd's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is Alter Air Ventilation 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 31 December 2025, due by 31 December 2026, and one for the period to 31 March 2026, due by 31 March 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Alter Air Ventilation Ltd still trading?
Alter Air Ventilation 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 Alter Air Ventilation Ltd do?
Alter Air Ventilation Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Alter Air Ventilation Ltd?
Alter Air Ventilation Ltd was incorporated on 13 December 2018, 7 years ago.
What is the penalty if Alter Air Ventilation 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 Alter Air Ventilation 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.