- Companies
- Installers
- South West Substructures Ltd
South West Substructures Ltd
- Company number
- 16675594
- Incorporated
- 27 Aug 20251 year trading
- Registered office
- 18 Biddisham Close, Nailsea, BS48 2QF
- Nature of business
- Other construction installation
South West Substructures Ltd is a 1-year-old private limited company registered in Nailsea, company number 16675594, one of the UK's installation companies (insulation, lifts, shutters and similar). Its next accounts are due at Companies House on 27 May 2027, and its first CT600 is due at HMRC on 26 August 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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Where South West Substructures Ltd is registered
The registered office is in Nailsea (BS48), in the North Somerset local authority area, South West. Show BS48 2QF on a map.
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What happens if South West Substructures 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 May 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 28 May 2027 to 27 Jun 2027 | £150 |
| 1 to 3 months late | 28 Jun 2027 to 27 Aug 2027 | £375 |
| 3 to 6 months late | 28 Aug 2027 to 27 Nov 2027 | £750 |
| More than 6 months late | From 28 Nov 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Sep 2027 | £200 |
| 3 months late | 30 Nov 2027 | another £200 |
| 6 months late | 29 Feb 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Aug 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
- 16675594
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 27 August 2025 (1 year ago)
- Registered office
- 18 Biddisham Close, Nailsea, BS48 2QF
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 August (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for installation companies (insulation, lifts, shutters and similar)
Installation companies (insulation, lifts, shutters, solar and similar) often buy stock and equipment up front, so stock at the year end and capital allowances both affect the tax bill.
Similar companies
Other active installation companies (insulation, lifts, shutters and similar).
Frequently asked questions
When are South West Substructures Ltd's accounts due?
South West Substructures Ltd's next accounts are due at Companies House by 27 May 2027 (in 226 days), covering the period to 31 August 2026.
When is South West Substructures 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 August 2026, due by 26 August 2027, and one for the period to 31 August 2026, due by 31 August 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is South West Substructures Ltd still trading?
South West Substructures Ltd is listed as active on the Companies House register (checked 13 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 South West Substructures Ltd do?
South West Substructures Ltd is registered under Other construction installation (SIC 43290).
How old is South West Substructures Ltd?
South West Substructures Ltd was incorporated on 27 August 2025, 1 year ago.
What is the penalty if South West Substructures 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 South West Substructures Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 13 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.