- Companies
- Civil engineering
- Substratus HDD Limited
Substratus HDD Limited
- Company number
- 16780679
- Incorporated
- 13 Oct 2025
- Registered office
- Daniel Farm, Sled Lane, Wylam, Northhumberland, NE41 8JH
- Nature of business
- Construction of utility projects for electricity and telecommunications
Substratus HDD Limited is a newly incorporated private limited company registered in Wylam, company number 16780679, one of the UK's civil engineering contractors. Its next accounts are due at Companies House on 13 July 2027, and its first CT600 is due at HMRC on 12 October 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 Substratus HDD Limited is registered
The registered office is in Wylam (NE41), in the Gateshead local authority area, North East. Show NE41 8JH on a map.
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Also registered at this address
1 other company uses the same registered office as Substratus HDD Limited.
- Empire Machinery Services LimitedMachinery repair and installation
What happens if Substratus HDD Limited 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 13 July 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 14 Jul 2027 to 13 Aug 2027 | £150 |
| 1 to 3 months late | 14 Aug 2027 to 13 Oct 2027 | £375 |
| 3 to 6 months late | 14 Oct 2027 to 13 Jan 2028 | £750 |
| More than 6 months late | From 14 Jan 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Nov 2027 | £200 |
| 3 months late | 31 Jan 2028 | another £200 |
| 6 months late | 30 Apr 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Oct 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
- 16780679
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 October 2025
- Registered office
- Daniel Farm, Sled Lane, Wylam, Northhumberland, NE41 8JH
- Nature of business
- Construction of utility projects for electricity and telecommunications (SIC 42220)
- Year end
- 31 October (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for civil engineering contractors
Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.
Similar companies
Other active civil engineering contractors.
Frequently asked questions
When are Substratus HDD Limited's accounts due?
Substratus HDD Limited's next accounts are due at Companies House by 13 July 2027 (in 274 days), covering the period to 31 October 2026.
When is Substratus HDD Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 12 October 2026, due by 12 October 2027, and one for the period to 31 October 2026, due by 31 October 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Substratus HDD Limited still trading?
Substratus HDD Limited 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 Substratus HDD Limited do?
Substratus HDD Limited is registered under Construction of utility projects for electricity and telecommunications (SIC 42220).
How old is Substratus HDD Limited?
Substratus HDD Limited was incorporated on 13 October 2025, less than a year ago.
What is the penalty if Substratus HDD Limited 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 Substratus HDD Limited 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.