- Companies
- Builders
- Southampton
- So31 Construction Ltd
So31 Construction Ltd
- Company number
- 11362029
- Incorporated
- 15 May 20188 years trading
- Registered office
- 53 Woolston RD, Netley, Southampton, Hampshire, SO31 5FR
- Nature of business
- Construction of domestic buildings
So31 Construction Ltd is a 8-year-old private limited company registered in Southampton, company number 11362029, one of 491 building contractors in Southampton. Its next accounts are due at Companies House on 31 December 2027, and the CT600 for the period to 31 March 2027 is due at HMRC on 31 March 2028.
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 £4,398 (-33.4%) on the year before, to £8,765.
- Net assets rose in 3 of 8 year-on-year comparisons on record.
- Current assets of £19K against £11K owed within a year: 1.8 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 9 years, 2019 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £8,765 | £19K | £11K | 2 | |
| 31 Mar 2025 | £13K | £23K | £11K | 2 | |
| 31 Mar 2024 | £19K | £24K | £6,674 | 2 | |
| 31 Mar 2023 | £17K | £32K | £18K | 3 | |
| 31 Mar 2022 | £17K | £25K | £7,515 | 3 | |
| 31 Mar 2021 | £12K | £26K | £13K | 3 | |
| 31 Mar 2020 | -£5,517 | £12K | £17K | 2 | |
| 30 Mar 2020 | -£5,517 | £12K | £17K | 2 | |
| 31 Mar 2019 | £458 | £14K | £13K |
Where So31 Construction Ltd is registered
The registered office is in Southampton (SO31), in the Eastleigh local authority area, South East. Show SO31 5FR on a map.
Other trade companies in SO31
- MNC Cleaning LtdCleaning companies
- Mars Eng. LtdMachinery repair and installation
- Amc Plumbing and Heating LtdPlumbers and heating engineers
- Pride & Bloom LtdLandscapers and gardeners
- Hampshire Heating and Cooling LtdPlumbers and heating engineers
- Kelpie Landscape & Build LtdFinishing trades
- FSC Facilities Services LtdInstallers
- Fitton & Redding Services LimitedMechanics and garages
What happens if So31 Construction 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 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2028 to 31 Jan 2028 | £150 |
| 1 to 3 months late | 1 Feb 2028 to 31 Mar 2028 | £375 |
| 3 to 6 months late | 1 Apr 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 2029 | 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
- 11362029
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 15 May 2018 (8 years ago)
- Registered office
- 53 Woolston RD, Netley, Southampton, Hampshire, SO31 5FR
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 14 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 Southampton
Other active building contractors registered in Southampton.
- Solent Bespoke Projects Limited2025
- Solentum Limited2026
- Solid Build Contractors Ltd2021
- Sonix Ltd2026
- Soton Construction Ltd2018
- South Coast Block and Beam Floors Ltd2026
- South Coast Landscape and Groundworks Ltd2026
- South Coast Services Limited2015
All building contractors in Southampton · All trades in Southampton · Builders across the UK
Frequently asked questions
When are So31 Construction Ltd's accounts due?
So31 Construction Ltd's next accounts are due at Companies House by 31 December 2027 (in 444 days), covering the period to 31 March 2027.
When is So31 Construction Ltd's CT600 due?
The CT600 for the period to 31 March 2027 is due at HMRC by 31 March 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2028.
Is So31 Construction Ltd still trading?
So31 Construction 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 So31 Construction Ltd do?
So31 Construction Ltd is registered under Construction of domestic buildings (SIC 41202).
How old is So31 Construction Ltd?
So31 Construction Ltd was incorporated on 15 May 2018, 8 years ago.
What is the penalty if So31 Construction 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 So31 Construction 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.