- Company number
- 11982853
- Incorporated
- 7 May 20197 years trading
- Registered office
- 7 Hickling Way, Harpenden, AL5 4RP
- Nature of business
- Construction of commercial buildings; Construction of domestic buildings; Other construction installation
A1Z Construction Limited is a 7-year-old private limited company registered in Harpenden, company number 11982853, one of 42 building contractors in Harpenden. Its next accounts are due at Companies House on 28 February 2027, and the CT600 for the period to 31 May 2026 is due at HMRC on 31 May 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 £2,836 (-2.8%) on the year before, to £100K.
- Net assets rose in 4 of 5 year-on-year comparisons on record.
- Current assets of £122K against £48K owed within a year: 2.5 times cover.
- 1 employee on average, down from 2 the year before.
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 May 2025 | £100K | £122K | £48K | 1 | |
| 31 May 2024 | £103K | £86K | £16K | 2 | |
| 31 May 2023 | £92K | £100K | £39K | 2 | |
| 31 May 2022 | £46K | £48K | £20K | 1 | |
| 31 May 2021 | £27K | £75K | £62K | 1 | |
| 31 May 2020 | £9,464 | £18K | £12K | 1 |
Where A1Z Construction Limited is registered
The registered office is in Harpenden (AL5), in the St Albans local authority area, East of England. Show AL5 4RP on a map.
Other trade companies in AL5
- M&T Building Services LimitedBuilders
- Rolfe Groundworks LtdGroundworks and demolition
- Rolls and Sons LtdProperty developers
- WM Holdings Group LtdProperty developers
- A Hussain Motor Group LtdMotor traders
- Harpenden Window Cleaning LtdCleaning companies
- Honey Bear Energy LimitedPlumbers and heating engineers
- M&D Paving LtdCivil engineering
What happens if A1Z Construction Limited 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 28 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Mar 2027 to 31 Mar 2027 | £150 |
| 1 to 3 months late | 1 Apr 2027 to 31 May 2027 | £375 |
| 3 to 6 months late | 1 Jun 2027 to 31 Aug 2027 | £750 |
| More than 6 months late | From 1 Sep 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2027 | £200 |
| 3 months late | 31 Aug 2027 | another £200 |
| 6 months late | 30 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 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
- 11982853
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 7 May 2019 (7 years ago)
- Registered office
- 7 Hickling Way, Harpenden, AL5 4RP
- Nature of business
- Construction of commercial buildings (SIC 41201)
Construction of domestic buildings (SIC 41202)
Other construction installation (SIC 43290) - Year end
- 31 May (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 6 May 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 Harpenden
Other active building contractors registered in Harpenden.
- Acg Construction and Refurbishment Limited2021
- Aiv Engineering Ltd2019
- Alban Developments Limited1963
- Anfora Properties Ltd2019
- Ayrton Lawrence Ltd2024
- B&N Building and Electrical Limited2019
- B.M.Hilton & Company Limited1971
- Battell Construction Ltd2025
All building contractors in Harpenden · All trades in Harpenden · Builders across the UK
Frequently asked questions
When are A1Z Construction Limited's accounts due?
A1Z Construction Limited's next accounts are due at Companies House by 28 February 2027 (in 139 days), covering the period to 31 May 2026.
When is A1Z Construction Limited's CT600 due?
The CT600 for the period to 31 May 2026 is due at HMRC by 31 May 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 March 2027.
Is A1Z Construction Limited still trading?
A1Z Construction Limited 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 A1Z Construction Limited do?
A1Z Construction Limited is registered under Construction of commercial buildings (SIC 41201); Construction of domestic buildings (SIC 41202); Other construction installation (SIC 43290).
How old is A1Z Construction Limited?
A1Z Construction Limited was incorporated on 7 May 2019, 7 years ago.
What is the penalty if A1Z Construction Limited 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 A1Z Construction Limited 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.