- Company number
- 15139290
- Incorporated
- 14 Sep 20233 years trading
- Registered office
- 43 Anthony Way, Slough, SL1 5PQ
- Nature of business
- Construction of domestic buildings
Aj Construction London Ltd is a 3-year-old private limited company registered in Slough, company number 15139290, one of 683 building contractors in Slough. Its next accounts are due at Companies House on 30 June 2027, and the CT600 for the period to 30 September 2026 is due at HMRC on 30 September 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 £32 (+0.8%) on the year before, to £3,924.
- Current assets of £15K against £15K owed within a year: 1.0 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 |
|---|---|---|---|---|---|
| 30 Sep 2025 | £3,924 | £15K | £15K | 1 | |
| 30 Sep 2024 | £3,892 | £7,911 | £4,019 | 1 |
Where Aj Construction London Ltd is registered
The registered office is in Slough (SL1), in the Slough local authority area, South East. Show SL1 5PQ on a map.
Other trade companies in SL1
- Yanky Construction LtdBuilders
- Westside Automotive LtdMotor traders
- Shadeworks LtdInstallers
- Yad Building Services LimitedBuilders
- Slough Vehicle Repair Centre LtdMechanics and garages
- Hadi Automotive LtdMotor traders
- Imperial Berkshire Motors LtdMotor traders
- MDN General LtdBuilders
What happens if Aj Construction London 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 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jul 2027 to 31 Jul 2027 | £150 |
| 1 to 3 months late | 1 Aug 2027 to 30 Sep 2027 | £375 |
| 3 to 6 months late | 1 Oct 2027 to 31 Dec 2027 | £750 |
| More than 6 months late | From 1 Jan 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2027 | £200 |
| 3 months late | 30 Dec 2027 | another £200 |
| 6 months late | 30 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 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
- 15139290
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 14 September 2023 (3 years ago)
- Registered office
- 43 Anthony Way, Slough, SL1 5PQ
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 30 September (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 13 September 2026
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 Slough
Other active building contractors registered in Slough.
- Ajmer Singh Ltd2021
- Ajsp Supplies Ltd2025
- Akaal Builders Ltd2023
- Akaal Builds Ltd2025
- Akaal Sahai Ltd2024
- Akashdeep Singh2 Ltd2022
- Akgroundworkers Ltd2026
- All Perfect Services Ltd2026
All building contractors in Slough · All trades in Slough · Builders across the UK
Frequently asked questions
When are Aj Construction London Ltd's accounts due?
Aj Construction London Ltd's next accounts are due at Companies House by 30 June 2027 (in 260 days), covering the period to 30 September 2026.
When is Aj Construction London Ltd's CT600 due?
The CT600 for the period to 30 September 2026 is due at HMRC by 30 September 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 July 2027.
Is Aj Construction London Ltd still trading?
Aj Construction London Ltd is listed as active on the Companies House register (checked 12 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 Aj Construction London Ltd do?
Aj Construction London Ltd is registered under Construction of domestic buildings (SIC 41202).
How old is Aj Construction London Ltd?
Aj Construction London Ltd was incorporated on 14 September 2023, 3 years ago.
What is the penalty if Aj Construction London 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 Aj Construction London Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 12 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.