- Companies
- Property developers
- Harrow
- Ac1 Construction Limited
Ac1 Construction Limited
- Company number
- 07456903
- Incorporated
- 1 Dec 201015 years trading
- Registered office
- Health Aid House, Marlborough Hill, Harrow, HA1 1UD
- Nature of business
- Development of building projects; Construction of commercial buildings; Construction of domestic buildings; Other construction installation
Ac1 Construction Limited is a 15-year-old private limited company registered in Harrow, company number 07456903, one of 679 property development companies in Harrow. 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 up £1.2M (+24.7%) on the year before, to £6.3M.
- Net assets rose in 8 of 9 year-on-year comparisons on record.
- Current assets of £7.9M against £2.1M owed within a year: 3.8 times cover.
- 33 employees on average, down from 39 the year before.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £6.3M | £1.5M | £7.9M | £2.1M | 33 |
| 31 Mar 2024 | £5M | £1.6M | £6.8M | £2.1M | 39 |
| 31 Mar 2023 | £3.7M | £878K | £5.2M | £1.7M | 36 |
| 31 Mar 2022 | £2M | £149K | £3M | £1.3M | 15 |
| 31 Mar 2021 | £1.1M | £267K | £2.8M | £2.1M | 14 |
| 31 Mar 2020 | £925K | £292K | £2.4M | £2M | 16 |
| 31 Mar 2019 | £216K | £12 | £1.3M | £1.2M | 16 |
| 31 Mar 2018 | £94K | £54K | £815K | £913K | |
| 31 Mar 2017 | £377K | £448K | £1.1M | £732K | |
| 31 Mar 2016 | £315K | £117K | £445K | £141K |
Where Ac1 Construction Limited is registered
The registered office is in Harrow (HA1), in the Harrow local authority area, London. Show HA1 1UD on a map.
Other trade companies in HA1
- Cabos Electrical LimitedElectricians
- Mia Maria Services LtdCleaning companies
- Ac Operations LtdScaffolders
- Verde Masters LtdLandscapers and gardeners
- Omega Works Group LtdLandscapers and gardeners
- Call 'Em LimitedPlumbers and heating engineers
- Swan Roofing Services LimitedRoofers
- DRV Property Solutions LtdPainters and decorators
Also registered at this address
1 other company uses the same registered office as Ac1 Construction Limited.
- Ac1 Developments LimitedProperty developers
What happens if Ac1 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 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
- 07456903
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 1 December 2010 (15 years ago)
- Registered office
- Health Aid House, Marlborough Hill, Harrow, HA1 1UD
- Nature of business
- Development of building projects (SIC 41100)
Construction of commercial buildings (SIC 41201)
Construction of domestic buildings (SIC 41202)
Other construction installation (SIC 43290) - Year end
- 31 March (accounting reference date)
- Accounts type
- Unaudited abridged
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 11 December 2025
- Charges (mortgages)
- 1 outstanding of 2 registered
Filing notes for property development companies
Many property development companies are single-project vehicles. Stock of land and buildings sits on the balance sheet as work in progress until sale, and a company that has finished its project may become dormant rather than close.
Similar companies in Harrow
Other active property development companies registered in Harrow.
- Ac1 Developments Limited2018
- Ac1 Maidenhead Project Limited2025
- Ac1 Victoria Limited2026
- Ace Builders & Decorators Ltd2025
- Acer Properties (Burnham) Limited2016
- Aci Properties Limited2014
- Acqua Plus Developments Limited2003
- Acre Kingston Limited2007
All property development companies in Harrow · All trades in Harrow · Property developers across the UK
Frequently asked questions
When are Ac1 Construction Limited's accounts due?
Ac1 Construction Limited's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is Ac1 Construction Limited'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 Ac1 Construction Limited still trading?
Ac1 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 Ac1 Construction Limited do?
Ac1 Construction Limited is registered under Development of building projects (SIC 41100); Construction of commercial buildings (SIC 41201); Construction of domestic buildings (SIC 41202); Other construction installation (SIC 43290).
How old is Ac1 Construction Limited?
Ac1 Construction Limited was incorporated on 1 December 2010, 15 years ago.
What is the penalty if Ac1 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 Ac1 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.