- Companies
- Groundworks and demolition
- Lewes
- South Downs Site Investigation Ltd
South Downs Site Investigation Ltd
- Company number
- 16422357
- Incorporated
- 30 Apr 20251 year trading
- Registered office
- 191 Old Malling Way, Lewes, BN7 2EF
- Nature of business
- Test drilling and boring; Other specialised construction activities n.e.c.
South Downs Site Investigation Ltd is a 1-year-old private limited company registered in Lewes, company number 16422357, one of the UK's groundworks and demolition companies. Its next accounts are due at Companies House on 31 January 2027, and its first CT600 is due at HMRC on 29 April 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.
Is this your company?
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Where South Downs Site Investigation Ltd is registered
The registered office is in Lewes (BN7), in the Lewes local authority area, South East. Show BN7 2EF on a map.
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What happens if South Downs Site Investigation 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 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Feb 2027 to 28 Feb 2027 | £150 |
| 1 to 3 months late | 1 Mar 2027 to 30 Apr 2027 | £375 |
| 3 to 6 months late | 1 May 2027 to 31 Jul 2027 | £750 |
| More than 6 months late | From 1 Aug 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 May 2027 | £200 |
| 3 months late | 30 Jul 2027 | another £200 |
| 6 months late | 30 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Apr 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
- 16422357
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 30 April 2025 (1 year ago)
- Registered office
- 191 Old Malling Way, Lewes, BN7 2EF
- Nature of business
- Test drilling and boring (SIC 43130)
Other specialised construction activities n.e.c. (SIC 43999) - Year end
- 30 April (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 29 April 2026
Filing notes for groundworks and demolition companies
Groundworks and demolition companies tend to own heavy plant, so capital allowances and hire purchase liabilities show up in both the accounts and the CT600.
Similar companies in Lewes
Other active groundworks and demolition companies registered in Lewes.
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Frequently asked questions
When are South Downs Site Investigation Ltd's accounts due?
South Downs Site Investigation Ltd's next accounts are due at Companies House by 31 January 2027 (in 110 days), covering the period to 30 April 2026.
When is South Downs Site Investigation 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 29 April 2026, due by 29 April 2027, and one for the period to 30 April 2026, due by 30 April 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is South Downs Site Investigation Ltd still trading?
South Downs Site Investigation 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 South Downs Site Investigation Ltd do?
South Downs Site Investigation Ltd is registered under Test drilling and boring (SIC 43130); Other specialised construction activities n.e.c. (SIC 43999).
How old is South Downs Site Investigation Ltd?
South Downs Site Investigation Ltd was incorporated on 30 April 2025, 1 year ago.
What is the penalty if South Downs Site Investigation 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 Downs Site Investigation 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.