- Company number
- 13659006
- Incorporated
- 4 Oct 20215 years trading
- Registered office
- Flat 15, Vivian Mansions, Vivian Avenue, London, NW4 3XJ
- Nature of business
- Construction of domestic buildings; Other building completion and finishing
Byko Construction Ltd is a 5-year-old private limited company registered in London, company number 13659006, one of 12,075 building contractors in London. Its next accounts are due at Companies House on 31 July 2027, and the CT600 for the period to 31 October 2026 is due at HMRC on 31 October 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets down £1,316 on the year before, to -£1,351.
- Current assets of £1,000 against £4,713 owed within a year: 0.2 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 3 years, 2022 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Oct 2025 | -£1,351 | £1,000 | £1,000 | £4,713 | 0 |
| 31 Oct 2024 | -£35 | £118 | £118 | £153 | 0 |
| 31 Oct 2022 | £378 | £1,180 | £802 | 0 |
Who runs and owns Byko Construction Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officer
| Name | Role | Appointed |
|---|---|---|
| B*** Y*** | Director | Oct 2021 |
Person with significant control
Where Byko Construction Ltd is registered
The registered office is in London (NW4), in the Barnet local authority area, London. Show NW4 3XJ on a map.
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What happens if Byko Construction 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 July 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Aug 2027 to 31 Aug 2027 | £150 |
| 1 to 3 months late | 1 Sep 2027 to 31 Oct 2027 | £375 |
| 3 to 6 months late | 1 Nov 2027 to 31 Jan 2028 | £750 |
| More than 6 months late | From 1 Feb 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
- 13659006
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 4 October 2021 (5 years ago)
- Registered office
- Flat 15, Vivian Mansions, Vivian Avenue, London, NW4 3XJ
- Nature of business
- Construction of domestic buildings (SIC 41202)
Other building completion and finishing (SIC 43390) - Year end
- 31 October (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 October 2025
- Last confirmation statement
- 3 October 2025
- Previous names
- 13659006 Ltd (until 23 Jan 2025)
Byko Construction Ltd (until 10 Jan 2025)
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.
- Byld More Ltd2022
- Byoot Construction Limited2022
- Byrne Group Residential Limited1997
- Bys Construction Alliance Ltd2026
- Bys Construction Ltd2020
- Bystry Construction Limited2012
- Bytrade Construction Ltd2013
- C & B Builder Ltd2026
All building contractors in London · All trades in London · Builders across the UK
Frequently asked questions
When are Byko Construction Ltd's accounts due?
Byko Construction Ltd's next accounts are due at Companies House by 31 July 2027 (in 292 days), covering the period to 31 October 2026.
When is Byko Construction Ltd's CT600 due?
The CT600 for the period to 31 October 2026 is due at HMRC by 31 October 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 August 2027.
Is Byko Construction Ltd still trading?
Byko Construction 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 Byko Construction Ltd do?
Byko Construction Ltd is registered under Construction of domestic buildings (SIC 41202); Other building completion and finishing (SIC 43390).
How old is Byko Construction Ltd?
Byko Construction Ltd was incorporated on 4 October 2021, 5 years ago.
Who runs Byko Construction Ltd?
Byko Construction Ltd has 1 active director, the longest-serving appointed in Oct 2021. Their names and service addresses are on the Companies House register.
Who owns Byko Construction Ltd?
One person or company has significant control of Byko Construction Ltd: an individual (owns 75% or more of the shares).
What is the penalty if Byko Construction 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 Byko Construction 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.