- Company number
- 16191176
- Incorporated
- 17 Jan 20251 year trading
- Registered office
- Unit 1 the Ajm Centre, Prospect Business Park, Swanage, Dorset, BH19 1FE
- Nature of business
- Construction of domestic buildings; Other building completion and finishing
Southside Construction Ltd is a 1-year-old private limited company registered in Swanage, company number 16191176, one of 26 building contractors in Swanage. Its next accounts are due at Companies House on 17 October 2026, and its first CT600 is due at HMRC on 16 January 2027.
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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Financial snapshot, 2026
From the balance sheet at 31 January 2026, as filed at Companies House.
Where Southside Construction Ltd is registered
The registered office is in Swanage (BH19), in the Dorset local authority area, South West. Show BH19 1FE on a map.
Other trade companies in BH19
- Stella Leisure LimitedSpecialist contractors
- Meteau Properties LimitedBuilders
- SF Construction (Dorset) LtdInstallers
- Kick Car Care LtdMechanics and garages
- L Parker Building Services LtdPlumbers and heating engineers
- Marston Property (Dorset) LtdBuilders
- Egan Customs LtdMechanics and garages
- Cleanbeee Services LtdCleaning companies
Shared registered office
67 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if Southside 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 17 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 18 Oct 2026 to 17 Nov 2026 | £150 |
| 1 to 3 months late | 18 Nov 2026 to 17 Jan 2027 | £375 |
| 3 to 6 months late | 18 Jan 2027 to 17 Apr 2027 | £750 |
| More than 6 months late | From 18 Apr 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2027 | £200 |
| 3 months late | 30 Apr 2027 | another £200 |
| 6 months late | 31 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- 16191176
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 17 January 2025 (1 year ago)
- Registered office
- Unit 1 the Ajm Centre, Prospect Business Park, Swanage, Dorset, BH19 1FE
- Nature of business
- Construction of domestic buildings (SIC 41202)
Other building completion and finishing (SIC 43390) - Year end
- 31 January (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 16 January 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 Swanage
Other active building contractors registered in Swanage.
- The Old Rocks Construction Co Ltd2024
- Voyce Builders Limited2006
- Apple Developments Ltd2005
- Beachcote Homes Limited1999
- Blue Fish Design & Build Ltd2014
- Bolton Group Developments Ltd2025
- Brian Glassock Builders Limited2002
- Bricks & Stones Ltd2013
All building contractors in Swanage · All trades in Swanage · Builders across the UK
Frequently asked questions
When are Southside Construction Ltd's accounts due?
Southside Construction Ltd's next accounts are due at Companies House by 17 October 2026 (in 5 days), covering the period to 31 January 2026.
When is Southside Construction 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 16 January 2026, due by 16 January 2027, and one for the period to 31 January 2026, due by 31 January 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Southside Construction Ltd still trading?
Southside 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 Southside Construction Ltd do?
Southside Construction Ltd is registered under Construction of domestic buildings (SIC 41202); Other building completion and finishing (SIC 43390).
How old is Southside Construction Ltd?
Southside Construction Ltd was incorporated on 17 January 2025, 1 year ago.
What is the penalty if Southside 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 Southside 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.