Air-Sep Ltd
- Company number
- 14738334
- Incorporated
- 17 Mar 20233 years trading
- Registered office
- 3 Anderson Court, Newnham Road, Cambridge, Cambridgeshire, CB3 9EZ
- Nature of business
- Repair and maintenance of aircraft and spacecraft
Air-Sep Ltd is a 3-year-old private limited company registered in Cambridge, company number 14738334, one of 366 machinery repair and installation companies in Cambridge. Its next accounts are due at Companies House on 30 December 2026, and the CT600 for the period to 30 March 2026 is due at HMRC on 30 March 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 £35 on the year before, to £35.
- Current assets of £14K against £15K owed within a year: 0.9 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 2 years, 2024 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £35 | £14K | £15K | 1 | |
| 31 Mar 2024 | £0 | £12K | £11K | 1 |
Where Air-Sep Ltd is registered
The registered office is in Cambridge (CB3), in the Cambridge local authority area, East of England. Show CB3 9EZ on a map.
Other trade companies in CB3
- Aviation Cabin Pro LtdMachinery repair and installation
- Zimin409 LtdMachinery repair and installation
- Boiteanu Aviation LtdMachinery repair and installation
- Ma27Electrical LtdMachinery repair and installation
- Costanova LtdMachinery repair and installation
- Geoflw LtdMachinery repair and installation
- Comanaz Engineering LtdMachinery repair and installation
- Stefanoiu LtdMachinery repair and installation
Shared registered office
332 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 Air-Sep 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 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 31 Dec 2026 to 30 Jan 2027 | £150 |
| 1 to 3 months late | 31 Jan 2027 to 30 Mar 2027 | £375 |
| 3 to 6 months late | 31 Mar 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 | 31 Mar 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 | 30 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
- 14738334
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 17 March 2023 (3 years ago)
- Registered office
- 3 Anderson Court, Newnham Road, Cambridge, Cambridgeshire, CB3 9EZ
- Nature of business
- Repair and maintenance of aircraft and spacecraft (SIC 33160)
- Year end
- 30 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 16 March 2026
Filing notes for machinery repair and installation companies
Machinery repair and installation companies often carry parts stock and specialist tools, and many work on contracts that span the year end.
Similar companies in Cambridge
Other active machinery repair and installation companies registered in Cambridge.
- Airbow Ltd2024
- Aircraft Structures Ltd2025
- Airfirm Ltd2026
- Airlinenuta Ltd2026
- Airmaint Limited2026
- Ajv Aerospace Ltd2026
- Alb1 Plumbing Heating & Electric Ltd2024
- Aleluia Aircraft Technical Maintenance Services Ltd2024
All machinery repair and installation companies in Cambridge · All trades in Cambridge · Machinery repair and installation across the UK
Frequently asked questions
When are Air-Sep Ltd's accounts due?
Air-Sep Ltd's next accounts are due at Companies House by 30 December 2026 (in 78 days), covering the period to 30 March 2026.
When is Air-Sep Ltd's CT600 due?
The CT600 for the period to 30 March 2026 is due at HMRC by 30 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 31 December 2026.
Is Air-Sep Ltd still trading?
Air-Sep 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 Air-Sep Ltd do?
Air-Sep Ltd is registered under Repair and maintenance of aircraft and spacecraft (SIC 33160).
How old is Air-Sep Ltd?
Air-Sep Ltd was incorporated on 17 March 2023, 3 years ago.
What is the penalty if Air-Sep 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 Air-Sep 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.