- Company number
- 17339566
- Incorporated
- 14 Jul 2026
- Registered office
- 128 City Road, London, EC1V 2NX
- Nature of business
- Construction of domestic buildings; Other specialised construction activities n.e.c.
Blackwell Cost Consultants Ltd is a newly incorporated private limited company registered in London, company number 17339566, one of 12,075 building contractors in London. Its next accounts are due at Companies House on 14 April 2028, and its first CT600 is due at HMRC on 13 July 2028.
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 Blackwell Cost Consultants Ltd is registered
The registered office is in London (EC1V), in the Islington local authority area, London. Show EC1V 2NX on a map.
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Shared registered office
2,436 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 Blackwell Cost Consultants 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 14 April 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 15 Apr 2028 to 14 May 2028 | £150 |
| 1 to 3 months late | 15 May 2028 to 14 Jul 2028 | £375 |
| 3 to 6 months late | 15 Jul 2028 to 14 Oct 2028 | £750 |
| More than 6 months late | From 15 Oct 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Aug 2028 | £200 |
| 3 months late | 31 Oct 2028 | another £200 |
| 6 months late | 31 Jan 2029 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jul 2029 | 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
- 17339566
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 14 July 2026
- Registered office
- 128 City Road, London, EC1V 2NX
- Nature of business
- Construction of domestic buildings (SIC 41202)
Other specialised construction activities n.e.c. (SIC 43999) - Year end
- 31 July (accounting reference date)
- Accounts type
- No accounts filed yet
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 London
Other active building contractors registered in London.
- Blackwolf Property Services Ltd2025
- Blagovest Services Limited2026
- Blakelynn Limited2016
- Blakemore Investments Limited2022
- Blakey Builds Ltd2025
- Blazuz Ltd2022
- Bleajbu CMP Limited2021
- Blend Construction Ltd2026
All building contractors in London · All trades in London · Builders across the UK
Frequently asked questions
When are Blackwell Cost Consultants Ltd's accounts due?
Blackwell Cost Consultants Ltd's next accounts are due at Companies House by 14 April 2028 (in 549 days), covering the period to 31 July 2027.
When is Blackwell Cost Consultants 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 13 July 2027, due by 13 July 2028, and one for the period to 31 July 2027, due by 31 July 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Blackwell Cost Consultants Ltd still trading?
Blackwell Cost Consultants 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 Blackwell Cost Consultants Ltd do?
Blackwell Cost Consultants Ltd is registered under Construction of domestic buildings (SIC 41202); Other specialised construction activities n.e.c. (SIC 43999).
How old is Blackwell Cost Consultants Ltd?
Blackwell Cost Consultants Ltd was incorporated on 14 July 2026, less than a year ago.
What is the penalty if Blackwell Cost Consultants 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 Blackwell Cost Consultants 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.