- Company number
- 06583315
- Incorporated
- 2 May 200818 years trading
- Registered office
- 1 Kilmarsh Road, London, W6 0PL
- Nature of business
- Construction of commercial buildings
A4 Building Ltd is a 18-year-old private limited company registered in London, company number 06583315, one of 12,075 building contractors in London. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 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 down £220 (-68.7%) on the year before, to £100.
- Net assets rose in 1 of 8 year-on-year comparisons on record.
- 1 employee on average during the year.
- Balance sheets on record for 9 years, 2015 to 2023.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2023 | £100 | £100 | £0 | 1 | |
| 31 Mar 2022 | £320 | £76 | £2,867 | 1 | |
| 31 Mar 2021 | £368 | £722 | £3,923 | 1 | |
| 31 Mar 2020 | £908 | £3,870 | £4,778 | 1 | |
| 31 Mar 2019 | £12K | £0 | £12K | ||
| 31 Mar 2018 | £12K | £1,700 | £14K | ||
| 31 Mar 2017 | -£10K | £0 | £0 | £14K | |
| 31 Mar 2016 | -£5,868 | £1,309 | £3,550 | £17K | |
| 31 Mar 2015 | £3,114 | £710 | £4,293 | £13K |
Where A4 Building Ltd is registered
The registered office is in London (W6), in the Hammersmith and Fulham local authority area, London. Show W6 0PL on a map.
Other trade companies in W6
- Goldhawk Contractors LtdInstallers
- Glow Trading LtdCleaning companies
- Element 4 Construction LtdFinishing trades
- Deluxe Partners LtdCleaning companies
- Starline Motors LimitedMotor traders
- Piotr Olechno Decorator LtdPainters and decorators
- PHJ Construction LtdBuilders
- Tribesell Motors LimitedMotor traders
Also registered at this address
16 other companies use the same registered office as A4 Building Ltd.
- A1 Sparks LimitedRepair services
- Aim Lifts LtdProperty developers
- BPS Renewables LtdPlumbers and heating engineers
- Darlo LtdFinishing trades
- Fit Out Watford LtdInstallers
- Havering Development Associates LtdProperty developers
- Holgersen Building LimitedBuilders
- Hookend Development LtdBuilders
- KMC Dry Liner Specialist LtdBuilders
- Latitude Construction LimitedProperty developers
- Mills Brickwork LtdBuilders
- Mills Plant Hire LtdSpecialist contractors
- N&D Projects LimitedProperty developers
- Raven Developments Essex LtdProperty developers
- S&O Residence LimitedProperty developers
- Stevenson Creek Ii LtdBuilders
What happens if A4 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 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
- 06583315
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 2 May 2008 (18 years ago)
- Registered office
- 1 Kilmarsh Road, London, W6 0PL
- Nature of business
- Construction of commercial buildings (SIC 41201)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 2 May 2026
- Previous names
- Towtry Ltd (until 27 Oct 2014)
Anton Building Services Limited (until 15 Sep 2014)
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 London
Other active building contractors registered in London.
- A7 Services Ltd2026
- A8G Cousins Construction Ltd2025
- Aa Builds Ltd2025
- Aa Capital Limited2018
- Aa Designandbuild Limited2018
- Aa Fireprotect Ltd2025
- Aa Fix IT Right Ltd2026
- Aa Marble Stonecare Limited2015
All building contractors in London · All trades in London · Builders across the UK
Frequently asked questions
When are A4 Building Ltd's accounts due?
A4 Building Ltd's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is A4 Building Ltd's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is A4 Building Ltd still trading?
A4 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 A4 Building Ltd do?
A4 Building Ltd is registered under Construction of commercial buildings (SIC 41201).
How old is A4 Building Ltd?
A4 Building Ltd was incorporated on 2 May 2008, 18 years ago.
What is the penalty if A4 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 A4 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.