- Company number
- 08348932
- Incorporated
- 7 Jan 201313 years trading
- Registered office
- 6A Dickensons Place, London, SE25 5HL
- Nature of business
- Construction of domestic buildings
Kosta Sons Contractors Limited is a 13-year-old private limited company registered in London, company number 08348932, one of 12,075 building contractors in London. Its next accounts are due at Companies House on 31 October 2027, and the CT600 for the period to 31 January 2027 is due at HMRC on 31 January 2028.
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 up £45K (+537.5%) on the year before, to £53K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £21K against £23K owed within a year: 0.9 times cover.
- 3 employees on average, down from 4 the year before.
- Balance sheets on record for 10 years, 2017 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jan 2026 | £53K | £21K | £23K | 3 | |
| 31 Jan 2025 | £8,317 | £7,986 | £31K | 4 | |
| 31 Jan 2024 | £1,040 | £13K | £19K | 4 | |
| 31 Jan 2023 | £5,019 | £20K | £20K | 5 | |
| 31 Jan 2022 | £9,086 | £4,095 | £14K | 4 | |
| 31 Jan 2021 | £2,715 | £3,135 | £7,230 | 2 | |
| 31 Jan 2020 | £7,072 | £8,057 | £7,197 | 2 | |
| 31 Jan 2019 | £3,553 | £3,131 | £2,354 | ||
| 31 Jan 2018 | £11K | £7,049 | £17K | £7,076 | 2 |
| 31 Jan 2017 | £3,567 | £2,062 | £4,606 | £2,844 | 2 |
Where Kosta Sons Contractors Limited is registered
The registered office is in London (SE25), in the Croydon local authority area, London. Show SE25 5HL on a map.
Other trade companies in SE25
- Luna Plumbing LtdPlumbers and heating engineers
- Mendivra LtdJoiners and carpenters
- Squeaky Mastery Services LtdCleaning companies
- MM(P)M LtdProperty developers
- Meysam Electrical LtdElectricians
- Madej Property Maintenance LtdFinishing trades
- Leonardo Bespoke Joinery LtdJoiners and carpenters
- GCS Electrical Services LimitedElectricians
Also registered at this address
2 other companies use the same registered office as Kosta Sons Contractors Limited.
- Dunne's Services LimitedRepair services
- Hibernian Commercial LimitedMotor traders
What happens if Kosta Sons Contractors 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 31 October 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Nov 2027 to 30 Nov 2027 | £150 |
| 1 to 3 months late | 1 Dec 2027 to 31 Jan 2028 | £375 |
| 3 to 6 months late | 1 Feb 2028 to 30 Apr 2028 | £750 |
| More than 6 months late | From 1 May 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2028 | £200 |
| 3 months late | 30 Apr 2028 | another £200 |
| 6 months late | 31 Jul 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- 08348932
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 7 January 2013 (13 years ago)
- Registered office
- 6A Dickensons Place, London, SE25 5HL
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 31 January (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 January 2026
- Last confirmation statement
- 30 July 2026
- Previous names
- K&S Building Contractors Limited (until 13 Jan 2014)
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.
- Kostov Construction Limited2025
- Kozhuharov Ltd2024
- Kozi Construction Ltd2019
- KP Building Developments Ltd2018
- KP Construction and Consultancy Ltd2025
- KP Minerals Ltd2019
- KPBD Ltd2025
- KPG Construction Ltd2024
All building contractors in London · All trades in London · Builders across the UK
Frequently asked questions
When are Kosta Sons Contractors Limited's accounts due?
Kosta Sons Contractors Limited's next accounts are due at Companies House by 31 October 2027 (in 383 days), covering the period to 31 January 2027.
When is Kosta Sons Contractors Limited's CT600 due?
The CT600 for the period to 31 January 2027 is due at HMRC by 31 January 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 November 2027.
Is Kosta Sons Contractors Limited still trading?
Kosta Sons Contractors 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 Kosta Sons Contractors Limited do?
Kosta Sons Contractors Limited is registered under Construction of domestic buildings (SIC 41202).
How old is Kosta Sons Contractors Limited?
Kosta Sons Contractors Limited was incorporated on 7 January 2013, 13 years ago.
What is the penalty if Kosta Sons Contractors 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 Kosta Sons Contractors 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.