- Company number
- 15314509
- Incorporated
- 28 Nov 20232 years trading
- Registered office
- 15 Tangmere Gardens, Northolt, UB5 6LP
- Nature of business
- Construction of domestic buildings
Aa Middlesex Building Ltd is a 2-year-old private limited company registered in Northolt, company number 15314509, one of 172 building contractors in Northolt. Its next accounts are due at Companies House on 30 November 2026, and its first CT600 is due at HMRC on 30 November 2026.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Where Aa Middlesex Building Ltd is registered
The registered office is in Northolt (UB5), in the Ealing local authority area, London. Show UB5 6LP on a map.
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Also registered at this address
1 other company uses the same registered office as Aa Middlesex Building Ltd.
- Mangat Roofing & Building LtdBuilders
What happens if Aa Middlesex Building 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 November 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Dec 2026 to 31 Dec 2026 | £150 |
| 1 to 3 months late | 1 Jan 2027 to 28 Feb 2027 | £375 |
| 3 to 6 months late | 1 Mar 2027 to 31 May 2027 | £750 |
| More than 6 months late | From 1 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Mar 2027 | £200 |
| 3 months late | 28 May 2027 | another £200 |
| 6 months late | 28 Aug 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 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
- 15314509
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 28 November 2023 (2 years ago)
- Registered office
- 15 Tangmere Gardens, Northolt, UB5 6LP
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 30 November (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 November 2024
- Last confirmation statement
- 27 November 2025
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 Northolt
Other active building contractors registered in Northolt.
- Aa Renovations Limited2016
- Aa&L Construction Ltd2022
- Ace Experts Ltd2016
- Ads Construction Ltd2021
- Ae Construction 25 Ltd2025
- Ajg Fire Ltd2021
- Ajpal Ltd2025
- Ak Contracting Ltd2024
All building contractors in Northolt · All trades in Northolt · Builders across the UK
Frequently asked questions
When are Aa Middlesex Building Ltd's accounts due?
Aa Middlesex Building Ltd's next accounts are due at Companies House by 30 November 2026 (in 49 days), covering the period to 28 February 2026.
When is Aa Middlesex Building 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 30 November 2025, due by 30 November 2026, and one for the period to 28 February 2026, due by 28 February 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Aa Middlesex Building Ltd still trading?
Aa Middlesex Building 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 Aa Middlesex Building Ltd do?
Aa Middlesex Building Ltd is registered under Construction of domestic buildings (SIC 41202).
How old is Aa Middlesex Building Ltd?
Aa Middlesex Building Ltd was incorporated on 28 November 2023, 2 years ago.
What is the penalty if Aa Middlesex Building 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 Aa Middlesex Building 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.