- Companies
- Groundworks and demolition
- London
- Thornycroft Build Ltd
Thornycroft Build Ltd
- Company number
- 15826901
- Incorporated
- 9 Jul 20242 years trading
- Registered office
- 20 Wenlock Road, London, N1 7GU
- Nature of business
- Demolition; Site preparation; Other building completion and finishing
Thornycroft Build Ltd is a 2-year-old private limited company registered in London, company number 15826901, one of 287 groundworks and demolition companies in London.
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 Thornycroft Build Ltd is registered
The registered office is in London (N1), in the Hackney local authority area, London. Show N1 7GU on a map.
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Shared registered office
1,583 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 Thornycroft Build 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 9 April 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 10 Apr 2026 to 9 May 2026 | £150 |
| 1 to 3 months late | 10 May 2026 to 9 Jul 2026 | £375 |
| 3 to 6 months late | 10 Jul 2026 to 9 Oct 2026 | £750 |
| More than 6 months late | From 10 Oct 2026 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Aug 2026 | £200 |
| 3 months late | 31 Oct 2026 | another £200 |
| 6 months late | 31 Jan 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jul 2027 | 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
- 15826901
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 9 July 2024 (2 years ago)
- Registered office
- 20 Wenlock Road, London, N1 7GU
- Nature of business
- Demolition (SIC 43110)
Site preparation (SIC 43120)
Other building completion and finishing (SIC 43390) - Year end
- 31 July (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 8 July 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 London
Other active groundworks and demolition companies registered in London.
- Three Boy Ann Ltd2023
- Tin Trans Ltd2012
- TLR Geotechnical Ltd2020
- Toge Construction Ltd2020
- Towerstone Construction Limited2025
- Townsite Ltd2025
- Trade Martinez Ltd2025
- Tradepeople Ltd2026
All groundworks and demolition companies in London · All trades in London · Groundworks and demolition across the UK
Frequently asked questions
When are Thornycroft Build Ltd's accounts due?
The register showed Thornycroft Build Ltd's accounts as due on 9 April 2026. That date has passed; the Companies House register shows whether they have been filed since.
When is Thornycroft Build 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 8 July 2025, due by 8 July 2026, and one for the period to 31 July 2025, due by 31 July 2026. Corporation tax is payable 9 months and 1 day after the end of each.
Is Thornycroft Build Ltd still trading?
Thornycroft Build 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 Thornycroft Build Ltd do?
Thornycroft Build Ltd is registered under Demolition (SIC 43110); Site preparation (SIC 43120); Other building completion and finishing (SIC 43390).
How old is Thornycroft Build Ltd?
Thornycroft Build Ltd was incorporated on 9 July 2024, 2 years ago.
What is the penalty if Thornycroft Build 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 Thornycroft Build 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.