- Companies
- Builders
- Southampton
- Sonix Ltd
Sonix Ltd
- Company number
- 17484295
- Incorporated
- 27 Sep 2026
- Registered office
- Flat 104 Albion Towers, Golden Grove, Southampton, SO14 1JA
- Nature of business
- Construction of domestic buildings
Sonix Ltd is a newly incorporated private limited company registered in Southampton, company number 17484295, one of 491 building contractors in Southampton. Its next accounts are due at Companies House on 27 June 2028, and its first CT600 is due at HMRC on 26 September 2028.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
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Who runs and owns Sonix Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officer
| Name | Role | Appointed |
|---|---|---|
| O*** S*** | Director | Sep 2026 |
Person with significant control
Where Sonix Ltd is registered
The registered office is in Southampton (SO14), in the Southampton local authority area, South East. Show SO14 1JA on a map.
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What happens if Sonix 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 27 June 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 28 Jun 2028 to 27 Jul 2028 | £150 |
| 1 to 3 months late | 28 Jul 2028 to 27 Sep 2028 | £375 |
| 3 to 6 months late | 28 Sep 2028 to 27 Dec 2028 | £750 |
| More than 6 months late | From 28 Dec 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2028 | £200 |
| 3 months late | 30 Dec 2028 | another £200 |
| 6 months late | 30 Mar 2029 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 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
- 17484295
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 27 September 2026
- Registered office
- Flat 104 Albion Towers, Golden Grove, Southampton, SO14 1JA
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 30 September (accounting reference date)
- Accounts type
- No accounts filed yet
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.
- Soton Construction Ltd2018
- South Coast Block and Beam Floors Ltd2026
- South Coast Landscape and Groundworks Ltd2026
- South Coast Services Limited2015
- South Contractor Group Ltd2025
- South Hampshire Builders Limited2025
- Southcott Estates Limited2014
- Southcott Homes (Fareham) Limited2014
All building contractors in Southampton · All trades in Southampton · Builders across the UK
Frequently asked questions
When are Sonix Ltd's accounts due?
Sonix Ltd's next accounts are due at Companies House by 27 June 2028 (in 624 days), covering the period to 30 September 2027.
When is Sonix Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 26 September 2027, due by 26 September 2028, and one for the period to 30 September 2027, due by 30 September 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Sonix Ltd still trading?
Sonix 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 Sonix Ltd do?
Sonix Ltd is registered under Construction of domestic buildings (SIC 41202).
How old is Sonix Ltd?
Sonix Ltd was incorporated on 27 September 2026, less than a year ago.
Who runs Sonix Ltd?
Sonix Ltd has 1 active director, the longest-serving appointed in Sep 2026. Their names and service addresses are on the Companies House register.
Who owns Sonix Ltd?
One person or company has significant control of Sonix Ltd: an individual (owns 75% or more of the shares).
What is the penalty if Sonix 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 Sonix 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.