- Company number
- 07089285
- Incorporated
- 27 Nov 200916 years trading
- Registered office
- 12 West Links Tollgate, Chandlers Ford, Eastleigh, Hampshire, SO53 3TG
- Nature of business
- Construction of commercial buildings
Square One Construction Limited is a 16-year-old private limited company registered in Eastleigh, company number 07089285, one of 89 building contractors in Eastleigh. 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 £56K (+7.4%) on the year before, to £807K.
- Net assets rose in 9 of 9 year-on-year comparisons on record.
- Current assets of £5M against £4.3M owed within a year: 1.2 times cover.
- 11 employees on average, up from 9 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 |
|---|---|---|---|---|---|
| 30 Sep 2025 | £807K | £2.2M | £5M | £4.3M | 11 |
| 30 Sep 2024 | £751K | £667K | £1.8M | £1.1M | 9 |
| 30 Sep 2023 | £672K | £949K | £1.5M | £728K | 8 |
| 30 Sep 2022 | £602K | £1.5M | £2.3M | £1.5M | 7 |
| 30 Sep 2021 | £601K | £1.9M | £2.6M | £1.7M | 6 |
| 30 Sep 2020 | £601K | £1.1M | £1.6M | £569K | 6 |
| 30 Sep 2019 | £600K | £1.7M | £3.1M | £2.6M | |
| 30 Sep 2018 | £600K | £519K | £1.9M | £1.4M | |
| 30 Sep 2017 | £600K | £1.5M | £3.7M | £3.2M | |
| 30 Sep 2016 | £566K | £660K | £1.9M | £1.4M |
Where Square One Construction Limited is registered
The registered office is in Eastleigh (SO53), in the Eastleigh local authority area, South East. Show SO53 3TG on a map.
Other trade companies in SO53
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- Audin Construction LtdSpecialist contractors
- Jelly West Developments LtdProperty developers
- Climate and Renewables Service LtdPlumbers and heating engineers
- McCarthy Construct LimitedProperty developers
- Cura Projects LimitedFinishing trades
- Tubmate LtdMachinery repair and installation
- Brook Hill Developments LimitedProperty developers
Also registered at this address
23 other companies use the same registered office as Square One Construction Limited.
- Atwell Construction LimitedBuilders
- B W Electrical & Energy LimitedElectricians
- Burton Property LimitedProperty developers
- CCM Homes (Scotland) LimitedBuilders
- Cost and Construction Management LimitedProperty developers
- Eden's Edge Landscaping LtdLandscapers and gardeners
- Hamble Ceramics LtdFloor and wall tilers
- Hyde Abbey House LimitedProperty developers
- Jelly West Developments LtdProperty developers
- Ladycroft Farm LtdBuilders
- LB Carpentry Hampshire LtdFinishing trades
- LSC Building Services LimitedPlumbers and heating engineers
- LSC Electrical LimitedElectricians
- Macmills LtdInstallers
- Mapledean Developments LimitedProperty developers
- Mapledean Special Projects LimitedBuilders
- Monks Brook Motors LtdMechanics and garages
- Moorland Views LimitedProperty developers
- Mortimers Farm Developments LtdProperty developers
- Mybridity LimitedBuilders
- New Acre Real Estate LtdProperty developers
- RCL Properties LtdProperty developers
- Up Developments LtdProperty developers
What happens if Square One 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 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
- 07089285
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 27 November 2009 (16 years ago)
- Registered office
- 12 West Links Tollgate, Chandlers Ford, Eastleigh, Hampshire, SO53 3TG
- Nature of business
- Construction of commercial buildings (SIC 41201)
- Year end
- 30 September (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 26 January 2026
- Charges (mortgages)
- 0 outstanding of 2 registered
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 Eastleigh
Other active building contractors registered in Eastleigh.
- STC Southern Ltd2023
- Swift Build Pro Limited2025
- Tgkitchens&Carpentry Ltd2021
- TJB Building Services Limited2016
- TJJ Builders Ltd2014
- Trowel Workz Limited2021
- Tso Construction Limited2011
- Wykeham Homes Ltd2015
All building contractors in Eastleigh · All trades in Eastleigh · Builders across the UK
Frequently asked questions
When are Square One Construction Limited's accounts due?
Square One Construction Limited's next accounts are due at Companies House by 30 June 2027 (in 261 days), covering the period to 30 September 2026.
When is Square One Construction Limited'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 Square One Construction Limited still trading?
Square One 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 Square One Construction Limited do?
Square One Construction Limited is registered under Construction of commercial buildings (SIC 41201).
How old is Square One Construction Limited?
Square One Construction Limited was incorporated on 27 November 2009, 16 years ago.
What is the penalty if Square One 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 Square One 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.