- Companies
- Specialist contractors
- Diss
- Alpha Air Testers Ltd
Alpha Air Testers Ltd
- Company number
- 11613880
- Incorporated
- 10 Oct 20188 years trading
- Registered office
- Sling Cottage North Green, Pulham ST. Mary, Diss, IP21 4XY
- Nature of business
- Other specialised construction activities n.e.c.
Alpha Air Testers Ltd is a 8-year-old private limited company registered in Diss, company number 11613880, one of 21 specialist construction companies in Diss. Its next accounts are due at Companies House on 31 January 2027, and the CT600 for the period to 30 April 2026 is due at HMRC on 30 April 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 down £16K (-83.2%) on the year before, to £3,129.
- Net assets rose in 3 of 5 year-on-year comparisons on record.
- Current assets of £3,376 against £7,530 owed within a year: 0.4 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 6 years, 2019 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Apr 2025 | £3,129 | £3,376 | £3,376 | £7,530 | 1 |
| 31 Oct 2023 | £19K | £28K | £13K | 1 | |
| 31 Oct 2022 | £8,554 | £16K | £8,492 | 1 | |
| 31 Oct 2021 | £4,752 | £11K | £6,722 | 1 | |
| 31 Oct 2020 | £3,828 | £9,839 | £6,684 | 1 | |
| 31 Oct 2019 | £7,581 | £13K | £7,500 | 1 |
Where Alpha Air Testers Ltd is registered
The registered office is in Diss (IP21), in the South Norfolk local authority area, East of England. Show IP21 4XY on a map.
Other trade companies in IP21
- LB3 Construction LimitedFinishing trades
- Malcolm Kidd Car & Commercial LtdMotor traders
- SJ Electeical & Automation LtdElectricians
- Home Service Installations and Silver Audio LtdBuilders
- Live Property Services LimitedElectricians
- Deards Build Maintain Restore LtdBuilders
- Zo Beckham LimitedProperty developers
- Cornish Garden Services LtdLandscapers and gardeners
What happens if Alpha Air Testers 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 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Feb 2027 to 28 Feb 2027 | £150 |
| 1 to 3 months late | 1 Mar 2027 to 30 Apr 2027 | £375 |
| 3 to 6 months late | 1 May 2027 to 31 Jul 2027 | £750 |
| More than 6 months late | From 1 Aug 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 May 2027 | £200 |
| 3 months late | 30 Jul 2027 | another £200 |
| 6 months late | 30 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Apr 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
- 11613880
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 October 2018 (8 years ago)
- Registered office
- Sling Cottage North Green, Pulham ST. Mary, Diss, IP21 4XY
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 30 April (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 April 2025
- Last confirmation statement
- 8 August 2026
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Diss
Other active specialist construction companies registered in Diss.
- Altair Geological and Environmental Services Ltd2026
- CLS Solar Energy UK Ltd2021
- DJP Traffic Solutions Ltd2026
- Fountain Fabrications Limited2012
- GKDF Construction Limited2025
- Ian Paris Ltd2019
- L A Hurrell Limited1999
- Manor House Oak Ltd2022
All specialist construction companies in Diss · All trades in Diss · Specialist contractors across the UK
Frequently asked questions
When are Alpha Air Testers Ltd's accounts due?
Alpha Air Testers Ltd's next accounts are due at Companies House by 31 January 2027 (in 110 days), covering the period to 30 April 2026.
When is Alpha Air Testers Ltd's CT600 due?
The CT600 for the period to 30 April 2026 is due at HMRC by 30 April 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 February 2027.
Is Alpha Air Testers Ltd still trading?
Alpha Air Testers 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 Alpha Air Testers Ltd do?
Alpha Air Testers Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Alpha Air Testers Ltd?
Alpha Air Testers Ltd was incorporated on 10 October 2018, 8 years ago.
What is the penalty if Alpha Air Testers 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 Alpha Air Testers 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.